RFC 8448
Example Handshake Traces for TLS 1.3
RFC 8448 🦋 Example Handshake Traces for TLS 1.3
okay bestie, the glow-up facts first ✨ this is RFC 8448, called Example Handshake Traces for TLS 1.3. It was written by M. Thomson from Mozilla 💜. The category is Informational, which means it's not a Standards Track spec. It's published for info and receipts, not as a rule you must follow 🌸. It's dated January 2019, with ISSN 2070-1721. It doesn't obsolete or update anything, since none are listed.
Abstract ✨
okay so the whole point of this doc is to show TLS 1.3 handshakes, the back-and-forth where a client and server agree on how to talk securely 🔐. the private keys and inputs are included so you can reproduce the handshakes yourself, and the in-between stuff (secrets, traffic keys, IVs) is shown too. that way you can check your implementation step by step instead of just staring at the final result and praying 🙏
Status of This Memo 📜
this one's not an Internet Standards Track spec, it's just published for information 💅
it's a product of the Internet Engineering Task Force (IETF) and reflects the consensus of the IETF community. it got public review and was approved for publication by the Internet Engineering Steering Group (IESG). not every IESG-approved doc is up for any level of Internet Standard, so check Section 2 of RFC 7841 if you want the deets 🧐
for the current status, any errata, and how to send feedback, go to https://www.rfc-editor.org/info/rfc8448.
Copyright Notice ©️
Copyright (c) 2019 IETF Trust and the persons identified as the document authors. All rights reserved.
this doc is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) as of the publication date. please actually read those, they spell out your rights and restrictions 📖 and any Code Components pulled out of this doc have to include Simplified BSD License text, as described in Section 4.e of the Trust Legal Provisions. they come with no warranty, per the Simplified BSD License 🫶
Table of Contents 🗂️
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Private Keys . . . . . . . . . . . . . . . . . . . . . . . . 2
3. Simple 1-RTT Handshake . . . . . . . . . . . . . . . . . . . 3
4. Resumed 0-RTT Handshake . . . . . . . . . . . . . . . . . . . 16
5. HelloRetryRequest . . . . . . . . . . . . . . . . . . . . . . 29
6. Client Authentication . . . . . . . . . . . . . . . . . . . . 43
7. Compatibility Mode . . . . . . . . . . . . . . . . . . . . . 55
8. Security Considerations . . . . . . . . . . . . . . . . . . . 67
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 67
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 67
10.1. Normative References . . . . . . . . . . . . . . . . . . 67
10.2. Informative References . . . . . . . . . . . . . . . . . 67
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 68
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 681. Introduction ✨
okay so TLS 1.3 [TLS13] brings a brand new key schedule and a bunch of new crypto operations 🔥 this doc includes sample handshakes that show every intermediate value. that means you can verify an implementation piece by piece, checking the inputs and outputs of each crypto computation on its own 🎀
you also get a private key with the traces, so you can import those values and confirm you get the same outputs 🔑
Note: Invocations of HMAC-based Extract-and-Expand Key Derivation Function (HKDF) [RFC5869] are not labeled, but you can identify them by the labels HKDF uses. bestie, look for the labels 👀
2. Private Keys 🔑
the ephemeral private keys are shown as they get generated in the traces 🦋
in most examples the server uses an RSA certificate. here's its private key:
modulus (public): b4 bb 49 8f 82 79 30 3d 98 08 36 39 9b 36 c6 98 8c
0c 68 de 55 e1 bd b8 26 d3 90 1a 24 61 ea fd 2d e4 9a 91 d0 15 ab
bc 9a 95 13 7a ce 6c 1a f1 9e aa 6a f9 8c 7c ed 43 12 09 98 e1 87
a8 0e e0 cc b0 52 4b 1b 01 8c 3e 0b 63 26 4d 44 9a 6d 38 e2 2a 5f
da 43 08 46 74 80 30 53 0e f0 46 1c 8c a9 d9 ef bf ae 8e a6 d1 d0
3e 2b d1 93 ef f0 ab 9a 80 02 c4 74 28 a6 d3 5a 8d 88 d7 9f 7f 1e
3f
public exponent: 01 00 01
private exponent: 04 de a7 05 d4 3a 6e a7 20 9d d8 07 21 11 a8 3c 81
e3 22 a5 92 78 b3 34 80 64 1e af 7c 0a 69 85 b8 e3 1c 44 f6 de 62
e1 b4 c2 30 9f 61 26 e7 7b 7c 41 e9 23 31 4b bf a3 88 13 05 dc 12
17 f1 6c 81 9c e5 38 e9 22 f3 69 82 8d 0e 57 19 5d 8c 84 88 46 02
07 b2 fa a7 26 bc f7 08 bb d7 db 7f 67 9f 89 34 92 fc 2a 62 2e 08
97 0a ac 44 1c e4 e0 c3 08 8d f2 5a e6 79 23 3d f8 a3 bd a2 ff 99
41
prime1: e4 35 fb 7c c8 37 37 75 6d ac ea 96 ab 7f 59 a2 cc 10 69 db
7d eb 19 0e 17 e3 3a 53 2b 27 3f 30 a3 27 aa 0a aa bc 58 cd 67 46
6a f9 84 5f ad c6 75 fe 09 4a f9 2c 4b d1 f2 c1 bc 33 dd 2e 05 15
prime2: ca bd 3b c0 e0 43 86 64 c8 d4 cc 9f 99 97 7a 94 d9 bb fe ad
8e 43 87 0a ba e3 f7 eb 8b 4e 0e ee 8a f1 d9 b4 71 9b a6 19 6c f2
cb ba ee eb f8 b3 49 0a fe 9e 9f fa 74 a8 8a a5 1f c6 45 62 93 03
exponent1: 3f 57 34 5c 27 fe 1b 68 7e 6e 76 16 27 b7 8b 1b 82 64 33
dd 76 0f a0 be a6 a6 ac f3 94 90 aa 1b 47 cd a4 86 9d 68 f5 84 dd
5b 50 29 bd 32 09 3b 82 58 66 1f e7 15 02 5e 5d 70 a4 5a 08 d3 d3
19
exponent2: 18 3d a0 13 63 bd 2f 28 85 ca cb dc 99 64 bf 47 64 f1 51
76 36 f8 64 01 28 6f 71 89 3c 52 cc fe 40 a6 c2 3d 0d 08 6b 47 c6
fb 10 d8 fd 10 41 e0 4d ef 7e 9a 40 ce 95 7c 41 77 94 e1 04 12 d1
39
coefficient: 83 9c a9 a0 85 e4 28 6b 2c 90 e4 66 99 7a 2c 68 1f 21
33 9a a3 47 78 14 e4 de c1 18 33 05 0e d5 0d d1 3c c0 38 04 8a 43
c5 9b 2a cc 41 68 89 c0 37 66 5f e5 af a6 05 96 9f 8c 01 df a5 ca
96 9d3. Simple 1-RTT Handshake 🤝
this is the simplest possible handshake, and it's giving main character energy 💖 the server gets authenticated, but the client stays anonymous. after connecting, a few application data octets get exchanged. the server also sends a session ticket that lets you use 0-RTT data in any resumed session ✨
{client} creates an ephemeral x25519 key pair:
private key (32 octets): 49 af 42 ba 7f 79 94 85 2d 71 3e f2 78
4b cb ca a7 91 1d e2 6a dc 56 42 cb 63 45 40 e7 ea 50 05
public key (32 octets): 99 38 1d e5 60 e4 bd 43 d2 3d 8e 43 5a 7d
ba fe b3 c0 6e 51 c1 3c ae 4d 54 13 69 1e 52 9a af 2c{client} constructs a ClientHello handshake message:
ClientHello (196 octets): 01 00 00 c0 03 03 cb 34 ec b1 e7 81 63
ba 1c 38 c6 da cb 19 6a 6d ff a2 1a 8d 99 12 ec 18 a2 ef 62 83
02 4d ec e7 00 00 06 13 01 13 03 13 02 01 00 00 91 00 00 00 0b
00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 14 00
12 00 1d 00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 23
00 00 00 33 00 26 00 24 00 1d 00 20 99 38 1d e5 60 e4 bd 43 d2
3d 8e 43 5a 7d ba fe b3 c0 6e 51 c1 3c ae 4d 54 13 69 1e 52 9a
af 2c 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03
02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06
02 02 02 00 2d 00 02 01 01 00 1c 00 02 40 01{client} sends the handshake record:
payload (196 octets): 01 00 00 c0 03 03 cb 34 ec b1 e7 81 63 ba
1c 38 c6 da cb 19 6a 6d ff a2 1a 8d 99 12 ec 18 a2 ef 62 83 02
4d ec e7 00 00 06 13 01 13 03 13 02 01 00 00 91 00 00 00 0b 00
09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 14 00 12
00 1d 00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 23 00
00 00 33 00 26 00 24 00 1d 00 20 99 38 1d e5 60 e4 bd 43 d2 3d
8e 43 5a 7d ba fe b3 c0 6e 51 c1 3c ae 4d 54 13 69 1e 52 9a af
2c 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03 02
03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02
02 02 00 2d 00 02 01 01 00 1c 00 02 40 01
complete record (201 octets): 16 03 01 00 c4 01 00 00 c0 03 03 cb
34 ec b1 e7 81 63 ba 1c 38 c6 da cb 19 6a 6d ff a2 1a 8d 99 12
ec 18 a2 ef 62 83 02 4d ec e7 00 00 06 13 01 13 03 13 02 01 00
00 91 00 00 00 0b 00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01
00 00 0a 00 14 00 12 00 1d 00 17 00 18 00 19 01 00 01 01 01 02
01 03 01 04 00 23 00 00 00 33 00 26 00 24 00 1d 00 20 99 38 1d
e5 60 e4 bd 43 d2 3d 8e 43 5a 7d ba fe b3 c0 6e 51 c1 3c ae 4d
54 13 69 1e 52 9a af 2c 00 2b 00 03 02 03 04 00 0d 00 20 00 1e
04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02
01 04 02 05 02 06 02 02 02 00 2d 00 02 01 01 00 1c 00 02 40 01{server} extracts the secret "early":
salt: 0 (all zero octets)
IKM (32 octets): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
secret (32 octets): 33 ad 0a 1c 60 7e c0 3b 09 e6 cd 98 93 68 0c
e2 10 ad f3 00 aa 1f 26 60 e1 b2 2e 10 f1 70 f9 2a{server} creates an ephemeral x25519 key pair:
private key (32 octets): b1 58 0e ea df 6d d5 89 b8 ef 4f 2d 56
52 57 8c c8 10 e9 98 01 91 ec 8d 05 83 08 ce a2 16 a2 1e
public key (32 octets): c9 82 88 76 11 20 95 fe 66 76 2b db f7 c6
72 e1 56 d6 cc 25 3b 83 3d f1 dd 69 b1 b0 4e 75 1f 0f{server} constructs a ServerHello handshake message:
ServerHello (90 octets): 02 00 00 56 03 03 a6 af 06 a4 12 18 60
dc 5e 6e 60 24 9c d3 4c 95 93 0c 8a c5 cb 14 34 da c1 55 77 2e
d3 e2 69 28 00 13 01 00 00 2e 00 33 00 24 00 1d 00 20 c9 82 88
76 11 20 95 fe 66 76 2b db f7 c6 72 e1 56 d6 cc 25 3b 83 3d f1
dd 69 b1 b0 4e 75 1f 0f 00 2b 00 02 03 04{server} derives the secret for the handshake "tls13 derived":
PRK (32 octets): 33 ad 0a 1c 60 7e c0 3b 09 e6 cd 98 93 68 0c e2
10 ad f3 00 aa 1f 26 60 e1 b2 2e 10 f1 70 f9 2a
hash (32 octets): e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24
27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
info (49 octets): 00 20 0d 74 6c 73 31 33 20 64 65 72 69 76 65 64
20 e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4
64 9b 93 4c a4 95 99 1b 78 52 b8 55
expanded (32 octets): 6f 26 15 a1 08 c7 02 c5 67 8f 54 fc 9d ba
b6 97 16 c0 76 18 9c 48 25 0c eb ea c3 57 6c 36 11 ba{server} extracts the secret "handshake":
salt (32 octets): 6f 26 15 a1 08 c7 02 c5 67 8f 54 fc 9d ba b6 97
16 c0 76 18 9c 48 25 0c eb ea c3 57 6c 36 11 ba
IKM (32 octets): 8b d4 05 4f b5 5b 9d 63 fd fb ac f9 f0 4b 9f 0d
35 e6 d6 3f 53 75 63 ef d4 62 72 90 0f 89 49 2d
secret (32 octets): 1d c8 26 e9 36 06 aa 6f dc 0a ad c1 2f 74 1b
01 04 6a a6 b9 9f 69 1e d2 21 a9 f0 ca 04 3f be ac{server} derives the secret "tls13 c hs traffic":
PRK (32 octets): 1d c8 26 e9 36 06 aa 6f dc 0a ad c1 2f 74 1b 01
04 6a a6 b9 9f 69 1e d2 21 a9 f0 ca 04 3f be ac
hash (32 octets): 86 0c 06 ed c0 78 58 ee 8e 78 f0 e7 42 8c 58 ed
d6 b4 3f 2c a3 e6 e9 5f 02 ed 06 3c f0 e1 ca d8
info (54 octets): 00 20 12 74 6c 73 31 33 20 63 20 68 73 20 74 72
61 66 66 69 63 20 86 0c 06 ed c0 78 58 ee 8e 78 f0 e7 42 8c 58
ed d6 b4 3f 2c a3 e6 e9 5f 02 ed 06 3c f0 e1 ca d8
expanded (32 octets): b3 ed db 12 6e 06 7f 35 a7 80 b3 ab f4 5e
2d 8f 3b 1a 95 07 38 f5 2e 96 00 74 6a 0e 27 a5 5a 21{server} derives the secret "tls13 s hs traffic":
PRK (32 octets): 1d c8 26 e9 36 06 aa 6f dc 0a ad c1 2f 74 1b 01
04 6a a6 b9 9f 69 1e d2 21 a9 f0 ca 04 3f be ac
hash (32 octets): 86 0c 06 ed c0 78 58 ee 8e 78 f0 e7 42 8c 58 ed
d6 b4 3f 2c a3 e6 e9 5f 02 ed 06 3c f0 e1 ca d8Okay so we're mid-key-derivation, and this part is literally all the math behind the handshake keys 🔐✨ Every info, salt, and IKM below is an exact value, so no fudging, bestie 💅
info (54 octets): 00 20 12 74 6c 73 31 33 20 73 20 68 73 20 74 72
61 66 66 69 63 20 86 0c 06 ed c0 78 58 ee 8e 78 f0 e7 42 8c 58
ed d6 b4 3f 2c a3 e6 e9 5f 02 ed 06 3c f0 e1 ca d8
expanded (32 octets): b6 7b 7d 69 0c c1 6c 4e 75 e5 42 13 cb 2d
37 b4 e9 c9 12 bc de d9 10 5d 42 be fd 59 d3 91 ad 38
{server} derive secret for master "tls13 derived":
PRK (32 octets): 1d c8 26 e9 36 06 aa 6f dc 0a ad c1 2f 74 1b 01
04 6a a6 b9 9f 69 1e d2 21 a9 f0 ca 04 3f be ac
hash (32 octets): e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24
27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
info (49 octets): 00 20 0d 74 6c 73 31 33 20 64 65 72 69 76 65 64
20 e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4
64 9b 93 4c a4 95 99 1b 78 52 b8 55
expanded (32 octets): 43 de 77 e0 c7 77 13 85 9a 94 4d b9 db 25
90 b5 31 90 a6 5b 3e e2 e4 f1 2d d7 a0 bb 7c e2 54 b4
{server} extract secret "master":
salt (32 octets): 43 de 77 e0 c7 77 13 85 9a 94 4d b9 db 25 90 b5
31 90 a6 5b 3e e2 e4 f1 2d d7 a0 bb 7c e2 54 b4
IKM (32 octets): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
secret (32 octets): 18 df 06 84 3d 13 a0 8b f2 a4 49 84 4c 5f 8a
47 80 01 bc 4d 4c 62 79 84 d5 a4 1d a8 d0 40 29 19
{server} send handshake record:
payload (90 octets): 02 00 00 56 03 03 a6 af 06 a4 12 18 60 dc 5e
6e 60 24 9c d3 4c 95 93 0c 8a c5 cb 14 34 da c1 55 77 2e d3 e2
69 28 00 13 01 00 00 2e 00 33 00 24 00 1d 00 20 c9 82 88 76 11
20 95 fe 66 76 2b db f7 c6 72 e1 56 d6 cc 25 3b 83 3d f1 dd 69
b1 b0 4e 75 1f 0f 00 2b 00 02 03 04
complete record (95 octets): 16 03 03 00 5a 02 00 00 56 03 03 a6
af 06 a4 12 18 60 dc 5e 6e 60 24 9c d3 4c 95 93 0c 8a c5 cb 14
34 da c1 55 77 2e d3 e2 69 28 00 13 01 00 00 2e 00 33 00 24 00
1d 00 20 c9 82 88 76 11 20 95 fe 66 76 2b db f7 c6 72 e1 56 d6
cc 25 3b 83 3d f1 dd 69 b1 b0 4e 75 1f 0f 00 2b 00 02 03 04
{server} derive write traffic keys for handshake data:
PRK (32 octets): b6 7b 7d 69 0c c1 6c 4e 75 e5 42 13 cb 2d 37 b4
e9 c9 12 bc de d9 10 5d 42 be fd 59 d3 91 ad 38
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): 3f ce 51 60 09 c2 17 27 d0 f2 e4 e8 6e
e4 03 bc
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): 5d 31 3e b2 67 12 76 ee 13 00 0b 30
{server} construct an EncryptedExtensions handshake message:
EncryptedExtensions (40 octets): 08 00 00 24 00 22 00 0a 00 14 00
12 00 1d 00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 1c
00 02 40 01 00 00 00 00
{server} construct a Certificate handshake message:
Certificate (445 octets): 0b 00 01 b9 00 00 01 b5 00 01 b0 30 82
01 ac 30 82 01 15 a0 03 02 01 02 02 01 02 30 0d 06 09 2a 86 48
86 f7 0d 01 01 0b 05 00 30 0e 31 0c 30 0a 06 03 55 04 03 13 03
72 73 61 30 1e 17 0d 31 36 30 37 33 30 30 31 32 33 35 39 5a 17
0d 32 36 30 37 33 30 30 31 32 33 35 39 5a 30 0e 31 0c 30 0a 06
03 55 04 03 13 03 72 73 61 30 81 9f 30 0d 06 09 2a 86 48 86 f7
0d 01 01 01 05 00 03 81 8d 00 30 81 89 02 81 81 00 b4 bb 49 8f
82 79 30 3d 98 08 36 39 9b 36 c6 98 8c 0c 68 de 55 e1 bd b8 26
d3 90 1a 24 61 ea fd 2d e4 9a 91 d0 15 ab bc 9a 95 13 7a ce 6c
1a f1 9e aa 6a f9 8c 7c ed 43 12 09 98 e1 87 a8 0e e0 cc b0 52
4b 1b 01 8c 3e 0b 63 26 4d 44 9a 6d 38 e2 2a 5f da 43 08 46 74
80 30 53 0e f0 46 1c 8c a9 d9 ef bf ae 8e a6 d1 d0 3e 2b d1 93
ef f0 ab 9a 80 02 c4 74 28 a6 d3 5a 8d 88 d7 9f 7f 1e 3f 02 03
01 00 01 a3 1a 30 18 30 09 06 03 55 1d 13 04 02 30 00 30 0b 06
03 55 1d 0f 04 04 03 02 05 a0 30 0d 06 09 2a 86 48 86 f7 0d 01
01 0b 05 00 03 81 81 00 85 aa d2 a0 e5 b9 27 6b 90 8c 65 f7 3a
72 67 17 06 18 a5 4c 5f 8a 7b 33 7d 2d f7 a5 94 36 54 17 f2 ea
e8 f8 a5 8c 8f 81 72 f9 31 9c f3 6b 7f d6 c5 5b 80 f2 1a 03 01
51 56 72 60 96 fd 33 5e 5e 67 f2 db f1 02 70 2e 60 8c ca e6 be
c1 fc 63 a4 2a 99 be 5c 3e b7 10 7c 3c 54 e9 b9 eb 2b d5 20 3b
1c 3b 84 e0 a8 b2 f7 59 40 9b a3 ea c9 d9 1d 40 2d cc 0c c8 f8
96 12 29 ac 91 87 b4 2b 4d e1 00 00
{server} construct a CertificateVerify handshake message:
CertificateVerify (136 octets): 0f 00 00 84 08 04 00 80 5a 74 7c
5d 88 fa 9b d2 e5 5a b0 85 a6 10 15 b7 21 1f 82 4c d4 84 14 5a
b3 ff 52 f1 fd a8 47 7b 0b 7a bc 90 db 78 e2 d3 3a 5c 14 1a 07
86 53 fa 6b ef 78 0c 5e a2 48 ee aa a7 85 c4 f3 94 ca b6 d3 0b
be 8d 48 59 ee 51 1f 60 29 57 b1 54 11 ac 02 76 71 45 9e 46 44
5c 9e a5 8c 18 1e 81 8e 95 b8 c3 fb 0b f3 27 84 09 d3 be 15 2a
3d a5 04 3e 06 3d da 65 cd f5 ae a2 0d 53 df ac d4 2f 74 f3
{server} calculate finished "tls13 finished":
PRK (32 octets): b6 7b 7d 69 0c c1 6c 4e 75 e5 42 13 cb 2d 37 b4
e9 c9 12 bc de d9 10 5d 42 be fd 59 d3 91 ad 38
hash (0 octets): (empty)
info (18 octets): 00 20 0e 74 6c 73 31 33 20 66 69 6e 69 73 68 65
64 00
expanded (32 octets): 00 8d 3b 66 f8 16 ea 55 9f 96 b5 37 e8 85
c3 1f c0 68 bf 49 2c 65 2f 01 f2 88 a1 d8 cd c1 9f c8
finished (32 octets): 9b 9b 14 1d 90 63 37 fb d2 cb dc e7 1d f4
de da 4a b4 2c 30 95 72 cb 7f ff ee 54 54 b7 8f 07 18
{server} construct a Finished handshake message:
Finished (36 octets): 14 00 00 20 9b 9b 14 1d 90 63 37 fb d2 cb
dc e7 1d f4 de da 4a b4 2c 30 95 72 cb 7f ff ee 54 54 b7 8f 07
18
{server} send handshake record:
payload (657 octets): 08 00 00 24 00 22 00 0a 00 14 00 12 00 1d
00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 1c 00 02 40
01 00 00 00 00 0b 00 01 b9 00 00 01 b5 00 01 b0 30 82 01 ac 30
82 01 15 a0 03 02 01 02 02 01 02 30 0d 06 09 2a 86 48 86 f7 0d
01 01 0b 05 00 30 0e 31 0c 30 0a 06 03 55 04 03 13 03 72 73 61
30 1e 17 0d 31 36 30 37 33 30 30 31 32 33 35 39 5a 17 0d 32 36
30 37 33 30 30 31 32 33 35 39 5a 30 0e 31 0c 30 0a 06 03 55 04
03 13 03 72 73 61 30 81 9f 30 0d 06 09 2a 86 48 86 f7 0d 01 01
01 05 00 03 81 8d 00 30 81 89 02 81 81 00 b4 bb 49 8f 82 79 30
3d 98 08 36 39 9b 36 c6 98 8c 0c 68 de 55 e1 bd b8 26 d3 90 1a
24 61 ea fd 2d e4 9a 91 d0 15 ab bc 9a 95 13 7a ce 6c 1a f1 9e
aa 6a f9 8c 7c ed 43 12 09 98 e1 87 a8 0e e0 cc b0 52 4b 1b 01
8c 3e 0b 63 26 4d 44 9a 6d 38 e2 2a 5f da 43 08 46 74 80 30 53
0e f0 46 1c 8c a9 d9 ef bf ae 8e a6 d1 d0 3e 2b d1 93 ef f0 ab
9a 80 02 c4 74 28 a6 d3 5a 8d 88 d7 9f 7f 1e 3f 02 03 01 00 01
a3 1a 30 18 30 09 06 03 55 1d 13 04 02 30 00 30 0b 06 03 55 1d
0f 04 04 03 02 05 a0 30 0d 06 09 2a 86 48 86 f7 0d 01 01 0b 05
00 03 81 81 00 85 aa d2 a0 e5 b9 27 6b 90 8c 65 f7 3a 72 67 17
06 18 a5 4c 5f 8a 7b 33 7d 2d f7 a5 94 36 54 17 f2 ea e8 f8 a5
8c 8f 81 72 f9 31 9c f3 6b 7f d6 c5 5b 80 f2 1a 03 01 51 56 72
60 96 fd 33 5e 5e 67 f2 db f1 02 70 2e 60 8c ca e6 be c1 fc 63
a4 2a 99 be 5c 3e b7 10 7c 3c 54 e9 b9 eb 2b d5 20 3b 1c 3b 84
e0 a8 b2 f7 59 40 9b a3 ea c9 d9 1d 40 2d cc 0c c8 f8 96 12 29
ac 91 87 b4 2b 4d e1 00 00 0f 00 00 84 08 04 00 80 5a 74 7c 5d
88 fa 9b d2 e5 5a b0 85 a6 10 15 b7 21 1f 82 4c d4 84 14 5a b3
ff 52 f1 fd a8 47 7b 0b 7a bc 90 db 78 e2 d3 3a 5c 14 1a 07 86
53 fa 6b ef 78 0c 5e a2 48 ee aa a7 85 c4 f3 94 ca b6 d3 0b be
8d 48 59 ee 51 1f 60 29 57 b1 54 11 ac 02 76 71 45 9e 46 44 5c
9e a5 8c 18 1e 81 8e 95 b8 c3 fb 0b f3 27 84 09 d3 be 15 2a 3d
a5 04 3e 06 3d da 65 cd f5 ae a2 0d 53 df ac d4 2f 74 f3 14 00
00 20 9b 9b 14 1d 90 63 37 fb d2 cb dc e7 1d f4 de da 4a b4 2c
30 95 72 cb 7f ff ee 54 54 b7 8f 07 18
complete record (679 octets): 17 03 03 02 a2 d1 ff 33 4a 56 f5 bf
f6 59 4a 07 cc 87 b5 80 23 3f 50 0f 45 e4 89 e7 f3 3a f3 5e df
78 69 fc f4 0a a4 0a a2 b8 ea 73 f8 48 a7 ca 07 61 2e f9 f9 45
cb 96 0b 40 68 90 51 23 ea 78 b1 11 b4 29 ba 91 91 cd 05 d2 a3
89 28 0f 52 61 34 aa dc 7f c7 8c 4b 72 9d f8 28 b5 ec f7 b1 3b
d9 ae fb 0e 57 f2 71 58 5b 8e a9 bb 35 5c 7c 79 02 07 16 cf b9
b1 18 3e f3 ab 20 e3 7d 57 a6 b9 d7 47 76 09 ae e6 e1 22 a4 cf
51 42 73 25 25 0c 7d 0e 50 92 89 44 4c 9b 3a 64 8f 1d 71 03 5d
2e d6 5b 0e 3c dd 0c ba e8 bf 2d 0b 22 78 12 cb b3 60 98 72 55
cc 74 41 10 c4 53 ba a4 fc d6 10 92 8d 80 98 10 e4 b7 ed 1a 8f
d9 91 f0 6a a6 24 82 04 79 7e 36 a6 a7 3b 70 a2 55 9c 09 ea d6
86 94 5b a2 46 ab 66 e5 ed d8 04 4b 4c 6d e3 fc f2 a8 94 41 ac
66 27 2f d8 fb 33 0e f8 19 05 79 b3 68 45 96 c9 60 bd 59 6e ea
52 0a 56 a8 d6 50 f5 63 aa d2 74 09 96 0d ca 63 d3 e6 88 61 1e
a5 e2 2f 44 15 cf 95 38 d5 1a 20 0c 27 03 42 72 96 8a 26 4e d6
54 0c 84 83 8d 89 f7 2c 24 46 1a ad 6d 26 f5 9e ca ba 9a cb bb
31 7b 66 d9 02 f4 f2 92 a3 6a c1 b6 39 c6 37 ce 34 31 17 b6 59
62 22 45 31 7b 49 ee da 0c 62 58 f1 00 d7 d9 61 ff b1 38 64 7e
92 ea 33 0f ae ea 6d fa 31 c7 a8 4d c3 bd 7e 1b 7a 6c 71 78 af
36 87 90 18 e3 f2 52 10 7f 24 3d 24 3d c7 33 9d 56 84 c8 b0 37
8b f3 02 44 da 8c 87 c8 43 f5 e5 6e b4 c5 e8 28 0a 2b 48 05 2c
f9 3b 16 49 9a 66 db 7c ca 71 e4 59 94 26 f7 d4 61 e6 6f 99 88
2b d8 9f c5 08 00 be cc a6 2d 6c 74 11 6d bd 29 72 fd a1 fa 80
f8 5d f8 81 ed be 5a 37 66 89 36 b3 35 58 3b 59 91 86 dc 5c 69
18 a3 96 fa 48 a1 81 d6 b6 fa 4f 9d 62 d5 13 af bb 99 2f 2b 99
2f 67 f8 af e6 7f 76 91 3f a3 88 cb 56 30 c8 ca 01 e0 c6 5d 11
c6 6a 1e 2a c4 c8 59 77 b7 c7 a6 99 9b bf 10 dc 35 ae 69 f5 51
56 14 63 6c 0b 9b 68 c1 9e d2 e3 1c 0b 3b 66 76 30 38 eb ba 42
f3 b3 8e dc 03 99 f3 a9 f2 3f aa 63 97 8c 31 7f c9 fa 66 a7 3f
60 f0 50 4d e9 3b 5b 84 5e 27 55 92 c1 23 35 ee 34 0b bc 4f dd
d5 02 78 40 16 e4 b3 be 7e f0 4d da 49 f4 b4 40 a3 0c b5 d2 af
93 98 28 fd 4a e3 79 4e 44 f9 4d f5 a6 31 ed e4 2c 17 19 bf da
bf 02 53 fe 51 75 be 89 8e 75 0e dc 53 37 0d 2b
{server} derive secret "tls13 c ap traffic":
PRK (32 octets): 18 df 06 84 3d 13 a0 8b f2 a4 49 84 4c 5f 8a 47
80 01 bc 4d 4c 62 79 84 d5 a4 1d a8 d0 40 29 19
hash (32 octets): 96 08 10 2a 0f 1c cc 6d b6 25 0b 7b 7e 41 7b 1a
00 0e aa da 3d aa e4 77 7a 76 86 c9 ff 83 df 13
info (54 octets): 00 20 12 74 6c 73 31 33 20 63 20 61 70 20 74 72
61 66 66 69 63 20 96 08 10 2a 0f 1c cc 6d b6 25 0b 7b 7e 41 7b
1a 00 0e aa da 3d aa e4 77 7a 76 86 c9 ff 83 df 13
expanded (32 octets): 9e 40 64 6c e7 9a 7f 9d c0 5a f8 88 9b ce
65 52 87 5a fa 0b 06 df 00 87 f7 92 eb b7 c1 75 04 a5
{server} derive secret "tls13 s ap traffic":
PRK (32 octets): 18 df 06 84 3d 13 a0 8b f2 a4 49 84 4c 5f 8a 47
80 01 bc 4d 4c 62 79 84 d5 a4 1d a8 d0 40 29 19
hash (32 octets): 96 08 10 2a 0f 1c cc 6d b6 25 0b 7b 7e 41 7b 1a
00 0e aa da 3d aa e4 77 7a 76 86 c9 ff 83 df 13
info (54 octets): 00 20 12 74 6c 73 31 33 20 73 20 61 70 20 74 72
61 66 66 69 63 20 96 08 10 2a 0f 1c cc 6d b6 25 0b 7b 7e 41 7b
1a 00 0e aa da 3d aa e4 77 7a 76 86 c9 ff 83 df 13
expanded (32 octets): a1 1a f9 f0 55 31 f8 56 ad 47 11 6b 45 a9
50 32 82 04 b4 f4 4b fb 6b 3a 4b 4f 1f 3f cb 63 16 43
{server} derive secret "tls13 exp master":PRK (32 octets): 18 df 06 84 3d 13 a0 8b f2 a4 49 84 4c 5f 8a 47 80 01 bc 4d 4c 62 79 84 d5 a4 1d a8 d0 40 29 19
hash (32 octets): 96 08 10 2a 0f 1c cc 6d b6 25 0b 7b 7e 41 7b 1a 00 0e aa da 3d aa e4 77 7a 76 86 c9 ff 83 df 13
info (52 octets): 00 20 10 74 6c 73 31 33 20 65 78 70 20 6d 61 73 74 65 72 20 96 08 10 2a 0f 1c cc 6d b6 25 0b 7b 7e 41 7b 1a 00 0e aa da 3d aa e4 77 7a 76 86 c9 ff 83 df 13
expanded (32 octets): fe 22 f8 81 17 6e da 18 eb 8f 44 52 9e 67 92 c5 0c 9a 3f 89 45 2f 68 d8 ae 31 1b 43 09 d3 cf 50
{server} derive write traffic keys for application data:
PRK (32 octets): a1 1a f9 f0 55 31 f8 56 ad 47 11 6b 45 a9 50 32 82 04 b4 f4 4b fb 6b 3a 4b 4f 1f 3f cb 63 16 43
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): 9f 02 28 3b 6c 9c 07 ef c2 6b b9 f2 ac 92 e3 56
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): cf 78 2b 88 dd 83 54 9a ad f1 e9 84
{server} derive read traffic keys for handshake data:
PRK (32 octets): b3 ed db 12 6e 06 7f 35 a7 80 b3 ab f4 5e 2d 8f 3b 1a 95 07 38 f5 2e 96 00 74 6a 0e 27 a5 5a 21
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): db fa a6 93 d1 76 2c 5b 66 6a f5 d9 50 25 8d 01
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): 5b d3 c7 1b 83 6e 0b 76 bb 73 26 5f
{client} extract secret "early" (same as server early secret) {client} derive secret for handshake "tls13 derived":
PRK (32 octets): 33 ad 0a 1c 60 7e c0 3b 09 e6 cd 98 93 68 0c e2 10 ad f3 00 aa 1f 26 60 e1 b2 2e 10 f1 70 f9 2a
hash (32 octets): e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
info (49 octets): 00 20 0d 74 6c 73 31 33 20 64 65 72 69 76 65 64 20 e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
expanded (32 octets): 6f 26 15 a1 08 c7 02 c5 67 8f 54 fc 9d ba b6 97 16 c0 76 18 9c 48 25 0c eb ea c3 57 6c 36 11 ba
{client} extract secret "handshake" (same as server handshake secret)
{client} derive secret "tls13 c hs traffic" (same as server)
{client} derive secret "tls13 s hs traffic" (same as server)
{client} derive secret for master "tls13 derived" (same as server)
{client} extract secret "master" (same as server master secret)
{client} derive read traffic keys for handshake data (same as server handshake data write traffic keys)
{client} calculate finished "tls13 finished" (same as server)
{client} derive secret "tls13 c ap traffic" (same as server)
{client} derive secret "tls13 s ap traffic" (same as server)
{client} derive secret "tls13 exp master" (same as server)
{client} derive write traffic keys for handshake data (same as server handshake data read traffic keys)
{client} derive read traffic keys for application data (same as server application data write traffic keys)
{client} calculate finished "tls13 finished":
PRK (32 octets): b3 ed db 12 6e 06 7f 35 a7 80 b3 ab f4 5e 2d 8f 3b 1a 95 07 38 f5 2e 96 00 74 6a 0e 27 a5 5a 21
hash (0 octets): (empty)
info (18 octets): 00 20 0e 74 6c 73 31 33 20 66 69 6e 69 73 68 65 64 00
expanded (32 octets): b8 0a d0 10 15 fb 2f 0b d6 5f f7 d4 da 5d 6b f8 3f 84 82 1d 1f 87 fd c7 d3 c7 5b 5a 7b 42 d9 c4
finished (32 octets): a8 ec 43 6d 67 76 34 ae 52 5a c1 fc eb e1 1a 03 9e c1 76 94 fa c6 e9 85 27 b6 42 f2 ed d5 ce 61
{client} construct a Finished handshake message:
Finished (36 octets): 14 00 00 20 a8 ec 43 6d 67 76 34 ae 52 5a c1 fc eb e1 1a 03 9e c1 76 94 fa c6 e9 85 27 b6 42 f2 ed d5 ce 61
{client} send handshake record:
payload (36 octets): 14 00 00 20 a8 ec 43 6d 67 76 34 ae 52 5a c1 fc eb e1 1a 03 9e c1 76 94 fa c6 e9 85 27 b6 42 f2 ed d5 ce 61
complete record (58 octets): 17 03 03 00 35 75 ec 4d c2 38 cc e6 0b 29 80 44 a7 1e 21 9c 56 cc 77 b0 51 7f e9 b9 3c 7a 4b fc 44 d8 7f 38 f8 03 38 ac 98 fc 46 de b3 84 bd 1c ae ac ab 68 67 d7 26 c4 05 46
{client} derive write traffic keys for application data:
PRK (32 octets): 9e 40 64 6c e7 9a 7f 9d c0 5a f8 88 9b ce 65 52 87 5a fa 0b 06 df 00 87 f7 92 eb b7 c1 75 04 a5
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): 17 42 2d da 59 6e d5 d9 ac d8 90 e3 c6 3f 50 51
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): 5b 78 92 3d ee 08 57 90 33 e5 23 d9
{client} derive secret "tls13 res master":
PRK (32 octets): 18 df 06 84 3d 13 a0 8b f2 a4 49 84 4c 5f 8a 47 80 01 bc 4d 4c 62 79 84 d5 a4 1d a8 d0 40 29 19
hash (32 octets): 20 91 45 a9 6e e8 e2 a1 22 ff 81 00 47 cc 95 26 84 65 8d 60 49 e8 64 29 42 6d b8 7c 54 ad 14 3d
info (52 octets): 00 20 10 74 6c 73 31 33 20 72 65 73 20 6d 61 73 74 65 72 20 20 91 45 a9 6e e8 e2 a1 22 ff 81 00 47 cc 95 26 84 65 8d 60 49 e8 64 29 42 6d b8 7c 54 ad 14 3d
expanded (32 octets): 7d f2 35 f2 03 1d 2a 05 12 87 d0 2b 02 41 b0 bf da f8 6c c8 56 23 1f 2d 5a ba 46 c4 34 ec 19 6c
{server} calculate finished "tls13 finished" (same as client)
{server} derive read traffic keys for application data (same as client application data write traffic keys)
{server} derive secret "tls13 res master" (same as client)
{server} generate resumption secret "tls13 resumption":
PRK (32 octets): 7d f2 35 f2 03 1d 2a 05 12 87 d0 2b 02 41 b0 bf da f8 6c c8 56 23 1f 2d 5a ba 46 c4 34 ec 19 6c
hash (2 octets): 00 00
info (22 octets): 00 20 10 74 6c 73 31 33 20 72 65 73 75 6d 70 74 69 6f 6e 02 00 00
expanded (32 octets): 4e cd 0e b6 ec 3b 4d 87 f5 d6 02 8f 92 2c a4 c5 85 1a 27 7f d4 13 11 c9 e6 2d 2c 94 92 e1 c4 f3
{server} construct a NewSessionTicket handshake message:
NewSessionTicket (205 octets): 04 00 00 c9 00 00 00 1e fa d6 aa c5 02 00 00 00 b2 2c 03 5d 82 93 59 ee 5f f7 af 4e c9 00 00 00 00 26 2a 64 94 dc 48 6d 2c 8a 34 cb 33 fa 90 bf 1b 00 70 ad 3c 49 88 83 c9 36 7c 09 a2 be 78 5a bc 55 cd 22 60 97 a3 a9 82 11 72 83 f8 2a 03 a1 43 ef d3 ff 5d d3 6d 64 e8 61 be 7f d6 1d 28 27 db 27 9c ce 14 50 77 d4 54 a3 66 4d 4e 6d a4 d2 9e e0 37 25 a6 a4 da fc d0 fc 67 d2 ae a7 05 29 51 3e 3d a2 67 7f a5 90 6c 5b 3f 7d 8f 92 f2 28 bd a4 0d da 72 14 70 f9 fb f2 97 b5 ae a6 17 64 6f ac 5c 03 27 2e 97 07 27 c6 21 a7 91 41 ef 5f 7d e6 50 5e 5b fb c3 88 e9 33 43 69 40 93 93 4a e4 d3 57 00 08 00 2a 00 04 00 00 04 00
{server} send handshake record:
payload (205 octets): 04 00 00 c9 00 00 00 1e fa d6 aa c5 02 00 00 00 b2 2c 03 5d 82 93 59 ee 5f f7 af 4e c9 00 00 00 00 26 2a 64 94 dc 48 6d 2c 8a 34 cb 33 fa 90 bf 1b 00 70 ad 3c 49 88 83 c9 36 7c 09 a2 be 78 5a bc 55 cd 22 60 97 a3 a9 82 11 72 83 f8 2a 03 a1 43 ef d3 ff 5d d3 6d 64 e8 61 be 7f d6 1d 28 27 db 27 9c ce 14 50 77 d4 54 a3 66 4d 4e 6d a4 d2 9e e0 37 25 a6 a4 da fc d0 fc 67 d2 ae a7 05 29 51 3e 3d a2 67 7f a5 90 6c 5b 3f 7d 8f 92 f2 28 bd a4 0d da 72 14 70 f9 fb f2 97 b5 ae a6 17 64 6f ac 5c 03 27 2e 97 07 27 c6 21 a7 91 41 ef 5f 7d e6 50 5e 5b fb c3 88 e9 33 43 69 40 93 93 4a e4 d3 57 00 08 00 2a 00 04 00 00 04 00
complete record (227 octets): 17 03 03 00 de 3a 6b 8f 90 41 4a 97 d6 95 9c 34 87 68 0d e5 13 4a 2b 24 0e 6c ff ac 11 6e 95 d4 1d 6a f8 f6 b5 80 dc f3 d1 1d 63 c7 58 db 28 9a 01 59 40 25 2f 55 71 3e 06 1d c1 3e 07 88 91 a3 8e fb cf 57 53 ad 8e f1 70 ad 3c 73 53 d1 6d 9d a7 73 b9 ca 7f 2b 9f a1 b6 c0 d4 a3 d0 3f 75 e0 9c 30 ba 1e 62 97 2a c4 6f 75 f7 b9 81 be 63 43 9b 29 99 ce 13 06 46 15 13 98 91 d5 e4 c5 b4 06 f1 6e 3f c1 81 a7 7c a4 75 84 00 25 db 2f 0a 77 f8 1b 5a b0 5b 94 c0 13 46 75 5f 69 23 2c 86 51 9d 86 cb ee ac 87 aa c3 47 d1 43 f9 60 5d 64 f6 50 db 4d 02 3e 70 e9 52 ca 49 fe 51 37 12 1c 74 bc 26 97 68 7e 24 87 46 d6 df 35 30 05 f3 bc e1 86 96 12 9c 81 53 55 6b 3b 6c 67 79 b3 7b f1 59 85 68 4f
{client} generate resumption secret "tls13 resumption" (same as server)
{client} send application_data record:
payload (50 octets): 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f 30 31
complete record (72 octets): 17 03 03 00 43 a2 3f 70 54 b6 2c 94 d0 af fa fe 82 28 ba 55 cb ef ac ea 42 f9 14 aa 66 bc ab 3f 2b 98 19 a8 a5 b4 6b 39 5b d5 4a 9a 20 44 1e 2b 62 97 4e 1f 5a 62 92 a2 97 70 14 bd 1e 3d ea e6 3a ee bb 21 69 49 15 e4
{server} send application_data record:
payload (50 octets): 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f 30 31
complete record (72 octets): 17 03 03 00 43 2e 93 7e 11 ef 4a c7 40 e5 38 ad 36 00 5f c4 a4 69 32 fc 32 25 d0 5f 82 aa 1b 36 e3 0e fa f9 7d 90 e6 df fc 60 2d cb 50 1a 59 a8 fc c4 9c 4b f2 e5 f0 a2 1c 00 47 c2 ab f3 32 54 0d d0 32 e1 67 c2 95 5d
{client} send alert record:
payload (2 octets): 01 00 complete record (24 octets): 17 03 03 00 13 c9 87 27 60 65 56 66 b7 4d 7f f1 15 3e fd 6d b6 d0 b0 e3
{server} send alert record:
payload (2 octets): 01 00
complete record (24 octets): 17 03 03 00 13 b5 8f d6 71 66 eb f5 99 d2 47 20 cf be 7e fa 7a 88 64 a9
---
# 4. Resumed 0-RTT Handshake ✨
okay so this handshake picks up right where <cyan>Section 3</cyan> left off 🧚 the server handed over a session ticket that said 0-RTT is allowed, and the client is set up for 0-RTT too, so the client is totally able to send 0-RTT data 💅🎀
> Note: The PSK binder uses the same construction as Finished and so is labeled as finished here. 🙈
Here's the client making its ephemeral x25519 key pair and working out the early secret 🦋
{client} create an ephemeral x25519 key pair:
private key (32 octets): bf f9 11 88 28 38 46 dd 6a 21 34 ef 71 80 ca 2b 0b 14 fb 10 dc e7 07 b5 09 8c 0d dd c8 13 b2 df
public key (32 octets): e4 ff b6 8a c0 5f 8d 96 c9 9d a2 66 98 34 6c 6b e1 64 82 ba dd da fe 05 1a 66 b4 f1 8d 66 8f 0b
{client} extract secret "early":
salt: 0 (all zero octets)
IKM (32 octets): 4e cd 0e b6 ec 3b 4d 87 f5 d6 02 8f 92 2c a4 c5 85 1a 27 7f d4 13 11 c9 e6 2d 2c 94 92 e1 c4 f3
secret (32 octets): 9b 21 88 e9 b2 fc 6d 64 d7 1d c3 29 90 0e 20 bb 41 91 50 00 f6 78 aa 83 9c bb 79 7c b7 d8 33 2c
{client} construct a ClientHello handshake message:
okay so the ClientHello is 477 octets and this is where the PSK binder gets calculated 🎀 we're literally watching the bytes get built, it's so iconic 🦋
ClientHello (477 octets): 01 00 01 fc 03 03 1b c3 ce b6 bb e3 9c ff 93 83 55 b5 a5 0a db 6d b2 1b 7a 6a f6 49 d7 b4 bc 41 9d 78 76 48 7d 95 00 00 06 13 01 13 03 13 02 01 00 01 cd 00 00 00 0b 00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 14 00 12 00 1d 00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 33 00 26 00 24 00 1d 00 20 e4 ff b6 8a c0 5f 8d 96 c9 9d a2 66 98 34 6c 6b e1 64 82 ba dd da fe 05 1a 66 b4 f1 8d 66 8f 0b 00 2a 00 00 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02 02 02 00 2d 00 02 01 01 00 1c 00 02 40 01 00 15 00 57 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 29 00 dd 00 b8 00 b2 2c 03 5d 82 93 59 ee 5f f7 af 4e c9 00 00 00 00 26 2a 64 94 dc 48 6d 2c 8a 34 cb 33 fa 90 bf 1b 00 70 ad 3c 49 88 83 c9 36 7c 09 a2 be 78 5a bc 55 cd 22 60 97 a3 a9 82 11 72 83 f8 2a 03 a1 43 ef d3 ff 5d d3 6d 64 e8 61 be 7f d6 1d 28 27 db 27 9c ce 14 50 77 d4 54 a3 66 4d 4e 6d a4 d2 9e e0 37 25 a6 a4 da fc d0 fc 67 d2 ae a7 05 29 51 3e 3d a2 67 7f a5 90 6c 5b 3f 7d 8f 92 f2 28 bd a4 0d da 72 14 70 f9 fb f2 97 b5 ae a6 17 64 6f ac 5c 03 27 2e 97 07 27 c6 21 a7 91 41 ef 5f 7d e6 50 5e 5b fb c3 88 e9 33 43 69 40 93 93 4a e4 d3 57 fa d6 aa cb
{client} calculate PSK binder:
ClientHello prefix (477 octets): 01 00 01 fc 03 03 1b c3 ce b6 bb e3 9c ff 93 83 55 b5 a5 0a db 6d b2 1b 7a 6a f6 49 d7 b4 bc 41 9d 78 76 48 7d 95 00 00 06 13 01 13 03 13 02 01 00 01 cd 00 00 00 0b 00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 14 00 12 00 1d 00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 33 00 26 00 24 00 1d 00 20 e4 ff b6 8a c0 5f 8d 96 c9 9d a2 66 98 34 6c 6b e1 64 82 ba dd da fe 05 1a 66 b4 f1 8d 66 8f 0b 00 2a 00 00 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02 02 02 00 2d 00 02 01 01 00 1c 00 02 40 01 00 15 00 57 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 29 00 dd 00 b8 00 b2 2c 03 5d 82 93 59 ee 5f f7 af 4e c9 00 00 00 00 26 2a 64 94 dc 48 6d 2c 8a 34 cb 33 fa 90 bf 1b 00 70 ad 3c 49 88 83 c9 36 7c 09 a2 be 78 5a bc 55 cd 22 60 97 a3 a9 82 11 72 83 f8 2a 03 a1 43 ef d3 ff 5d d3 6d 64 e8 61 be 7f d6 1d 28 27 db 27 9c ce 14 50 77 d4 54 a3 66 4d 4e 6d a4 d2 9e e0 37 25 a6 a4 da fc d0 fc 67 d2 ae a7 05 29 51 3e 3d a2 67 7f a5 90 6c 5b 3f 7d 8f 92 f2 28 bd a4 0d da 72 14 70 f9 fb f2 97 b5 ae a6 17 64 6f ac 5c 03 27 2e 97 07 27 c6 21 a7 91 41 ef 5f 7d e6 50 5e 5b fb c3 88 e9 33 43 69 40 93 93 4a e4 d3 57 fa d6 aa cb
binder hash (32 octets): 63 22 4b 2e 45 73 f2 d3 45 4c a8 4b 9d 00 9a 04 f6 be 9e 05 71 1a 83 96 47 3a ef a0 1e 92 4a 14
PRK (32 octets): 69 fe 13 1a 3b ba d5 d6 3c 64 ee bc c3 0e 39 5b 9d 81 07 72 6a 13 d0 74 e3 89 db c8 a4 e4 72 56
hash (0 octets): (empty)
info (18 octets): 00 20 0e 74 6c 73 31 33 20 66 69 6e 69 73 68 65 64 00
expanded (32 octets): 55 88 67 3e 72 cb 59 c8 7d 22 0c af fe 94 f2 de a9 a3 b1 60 9f 7d 50 e9 0a 48 22 7d b9 ed 7e aa
finished (32 octets): 3a dd 4f b2 d8 fd f8 22 a0 ca 3c f7 67 8e f5 e8 8d ae 99 01 41 c5 92 4d 57 bb 6f a3 1b 9e 5f 9d
ok the binder is locked in and now the client actually sends the handshake record 🫶💖 this one's 512 octets of payload, and the full record is 517 octets once the 5-byte header is tacked on 🌸
{client} send handshake record:
payload (512 octets): 01 00 01 fc 03 03 1b c3 ce b6 bb e3 9c ff 93 83 55 b5 a5 0a db 6d b2 1b 7a 6a f6 49 d7 b4 bc 41 9d 78 76 48 7d 95 00 00 06 13 01 13 03 13 02 01 00 01 cd 00 00 00 0b 00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 14 00 12 00 1d 00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 33 00 26 00 24 00 1d 00 20 e4 ff b6 8a c0 5f 8d 96 c9 9d a2 66 98 34 6c 6b e1 64 82 ba dd da fe 05 1a 66 b4 f1 8d 66 8f 0b 00 2a 00 00 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02 02 02 00 2d 00 02 01 01 00 1c 00 02 40 01 00 15 00 57 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 29 00 dd 00 b8 00 b2 2c 03 5d 82 93 59 ee 5f f7 af 4e c9 00 00 00 00 26 2a 64 94 dc 48 6d 2c 8a 34 cb 33 fa 90 bf 1b 00 70 ad 3c 49 88 83 c9 36 7c 09 a2 be 78 5a bc 55 cd 22 60 97 a3 a9 82 11 72 83 f8 2a 03 a1 43 ef d3 ff 5d d3 6d 64 e8 61 be 7f d6 1d 28 27 db 27 9c ce 14 50 77 d4 54 a3 66 4d 4e 6d a4 d2 9e e0 37 25 a6 a4 da fc d0 fc 67 d2 ae a7 05 29 51 3e 3d a2 67 7f a5 90 6c 5b 3f 7d 8f 92 f2 28 bd a4 0d da 72 14 70 f9 fb f2 97 b5 ae a6 17 64 6f ac 5c 03 27 2e 97 07 27 c6 21 a7 91 41 ef 5f 7d e6 50 5e 5b fb c3 88 e9 33 43 69 40 93 93 4a e4 d3 57 fa d6 aa cb 00 21 20 3a dd 4f b2 d8 fd f8 22 a0 ca 3c f7 67 8e f5 e8 8d ae 99 01 41 c5 92 4d 57 bb 6f a3 1b 9e 5f 9d
complete record (517 octets): 16 03 01 02 00 01 00 01 fc 03 03 1b c3 ce b6 bb e3 9c ff 93 83 55 b5 a5 0a db 6d b2 1b 7a 6a f6 49 d7 b4 bc 41 9d 78 76 48 7d 95 00 00 06 13 01 13 03 13 02 01 00 01 cd 00 00 00 0b 00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 14 00 12 00 1d 00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 33 00 26 00 24 00 1d 00 20 e4 ff b6 8a c0 5f 8d 96 c9 9d a2 66 98 34 6c 6b e1 64 82 ba dd da fe 05 1a 66 b4 f1 8d 66 8f 0b 00 2a 00 00 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02 02 02 00 2d 00 02 01 01 00 1c 00 02 40 01 00 15 00 57 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 29 00 dd 00 b8 00 b2 2c 03 5d 82 93 59 ee 5f f7 af 4e c9 00 00 00 00 26 2a 64 94 dc 48 6d 2c 8a 34 cb 33 fa 90 bf 1b 00 70 ad 3c 49 88 83 c9 36 7c 09 a2 be 78 5a bc 55 cd 22 60 97 a3 a9 82 11 72 83 f8 2a 03 a1 43 ef d3 ff 5d d3 6d 64 e8 61 be 7f d6 1d 28 27 db 27 9c ce 14 50 77 d4 54 a3 66 4d 4e 6d a4 d2 9e e0 37 25 a6 a4 da fc d0 fc 67 d2 ae a7 05 29 51 3e 3d a2 67 7f a5 90 6c 5b 3f 7d 8f 92 f2 28 bd a4 0d da 72 14 70 f9 fb f2 97 b5 ae a6 17 64 6f ac 5c 03 27 2e 97 07 27 c6 21 a7 91 41 ef 5f 7d e6 50 5e 5b fb c3 88 e9 33 43 69 40 93 93 4a e4 d3 57 fa d6 aa cb 00 21 20 3a dd 4f b2 d8 fd f8 22 a0 ca 3c f7 67 8e f5 e8 8d ae 99 01 41 c5 92 4d 57 bb 6f a3 1b 9e 5f 9d
next up the client derives its early traffic secrets 🧚✨ it's giving key-making era, bestie
{client} derive secret "tls13 c e traffic":
PRK (32 octets): 9b 21 88 e9 b2 fc 6d 64 d7 1d c3 29 90 0e 20 bb 41 91 50 00 f6 78 aa 83 9c bb 79 7c b7 d8 33 2c
hash (32 octets): 08 ad 0f a0 5d 7c 72 33 b1 77 5b a2 ff 9f 4c 5b 8b 59 27 6b 7f 22 7f 13 a9 76 24 5f 5d 96 09 13
info (53 octets): 00 20 11 74 6c 73 31 33 20 63 20 65 20 74 72 61 66 66 69 63 20 08 ad 0f a0 5d 7c 72 33 b1 77 5b a2 ff 9f 4c 5b 8b 59 27 6b 7f 22 7f 13 a9 76 24 5f 5d 96 09 13
expanded (32 octets): 3f bb e6 a6 0d eb 66 c3 0a 32 79 5a ba 0e ff 7e aa 10 10 55 86 e7 be 5c 09 67 8d 63 b6 ca ab 62
{client} derive secret "tls13 e exp master":
PRK (32 octets): 9b 21 88 e9 b2 fc 6d 64 d7 1d c3 29 90 0e 20 bb 41 91 50 00 f6 78 aa 83 9c bb 79 7c b7 d8 33 2c
hash (32 octets): 08 ad 0f a0 5d 7c 72 33 b1 77 5b a2 ff 9f 4c 5b 8b 59 27 6b 7f 22 7f 13 a9 76 24 5f 5d 96 09 13
info (54 octets): 00 20 12 74 6c 73 31 33 20 65 20 65 78 70 20 6d 61 73 74 65 72 20 08 ad 0f a0 5d 7c 72 33 b1 77 5b a2 ff 9f 4c 5b 8b 59 27 6b 7f 22 7f 13 a9 76 24 5f 5d 96 09 13
expanded (32 octets): b2 02 68 66 61 09 37 d7 42 3e 5b e9 08 62 cc f2 4c 0e 60 91 18 6d 34 f8 12 08 9f f5 be 2e f7 df
now the client gets its write keys for early application data 🔑💜 this is the moment the 0-RTT data is ready to go, periodt
{client} derive write traffic keys for early application data:
PRK (32 octets): 3f bb e6 a6 0d eb 66 c3 0a 32 79 5a ba 0e ff 7e aa 10 10 55 86 e7 be 5c 09 67 8d 63 b6 ca ab 62
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): 92 02 05 a5 b7 bf 21 15 e6 fc 5c 29 42 83 4f 54
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): 6d 47 5f 09 93 c8 e5 64 61 0d b2 b9
and here's the client actually sending its application data 🦋 the payload is six octets (`41 42 43 44 45 46`) and the whole record comes out at 28 octets, so it's very compact, very main character 💅
{client} send application_data record:
payload (6 octets): 41 42 43 44 45 46
complete record (28 octets): 17 03 03 00 17 ab 1d f4 20 e7 5c 45 7a 7c c5 d2 84 4f 76 d5 ae e4 b4 ed bf 04 9b e0
okay now it's the server's turn to catch up 🧚🌈 it re-derives the early secret, then makes its own ephemeral x25519 key pair, so the key exchange is giving fresh start energy 🍓
{server} extract secret "early" (same as client early secret)
{server} calculate PSK binder (same as client):
{server} create an ephemeral x25519 key pair:
private key (32 octets): de 5b 44 76 e7 b4 90 b2 65 2d 33 8a cb f2 94 80 66 f2 55 f9 44 0e 23 b9 8f c6 98 35 29 8d c1 07
public key (32 octets): 12 17 61 ee 42 c3 33 e1 b9 e7 7b 60 dd 57 c2 05 3c d9 45 12 ab 47 f1 15 e8 6e ff 50 94 2c ea 31
{server} derive secret "tls13 c e traffic" (same as client)
{server} derive secret "tls13 e exp master" (same as client)
the server builds its ServerHello next, 96 octets of pure hype 👑🎀
{server} construct a ServerHello handshake message:
ServerHello (96 octets): 02 00 00 5c 03 03 3c cf d2 de c8 90 22 27 63 47 2a e8 13 67 77 c9 d7 35 87 77 bb 66 e9 1e a5 12 24 95 f5 59 ea 2d 00 13 01 00 00 34 00 29 00 02 00 00 00 33 00 24 00 1d 00 20 12 17 61 ee 42 c3 33 e1 b9 e7 7b 60 dd 57 c2 05 3c d9 45 12 ab 47 f1 15 e8 6e ff 50 94 2c ea 31 00 2b 00 02 03 04
and now the server derives its handshake secrets 🔥 this part's so layered, it's like the protocol is doing a whole skincare routine 🌸
{server} derive secret for handshake "tls13 derived":
PRK (32 octets): 9b 21 88 e9 b2 fc 6d 64 d7 1d c3 29 90 0e 20 bb 41 91 50 00 f6 78 aa 83 9c bb 79 7c b7 d8 33 2c
hash (32 octets): e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
info (49 octets): 00 20 0d 74 6c 73 31 33 20 64 65 72 69 76 65 64 20 e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
expanded (32 octets): 5f 17 90 bb d8 2c 5e 7d 37 6e d2 e1 e5 2f 8e 60 38 c9 34 6d b6 1b 43 be 9a 52 f7 7e f3 99 8e 80
{server} extract secret "handshake":
salt (32 octets): 5f 17 90 bb d8 2c 5e 7d 37 6e d2 e1 e5 2f 8e 60 38 c9 34 6d b6 1b 43 be 9a 52 f7 7e f3 99 8e 80
IKM (32 octets): f4 41 94 75 6f f9 ec 9d 25 18 06 35 d6 6e a6 82 4c 6a b3 bf 17 99 77 be 37 f7 23 57 0e 7c cb 2e
secret (32 octets): 00 5c b1 12 fd 8e b4 cc c6 23 bb 88 a0 7c 64 b3 ed e1 60 53 63 fc 7d 0d f8 c7 ce 4f f0 fb 4a e6
{server} derive secret "tls13 c hs traffic":
PRK (32 octets): 00 5c b1 12 fd 8e b4 cc c6 23 bb 88 a0 7c 64 b3 ed e1 60 53 63 fc 7d 0d f8 c7 ce 4f f0 fb 4a e6
hash (32 octets): f7 36 cb 34 fe 25 e7 01 55 1b ee 6f d2 4c 1c c7
10 2a 7d af 94 05 cb 15 d9 7a af e1 6f 75 7d 03
info (54 octets): 00 20 12 74 6c 73 31 33 20 63 20 68 73 20 74 72
61 66 66 69 63 20 f7 36 cb 34 fe 25 e7 01 55 1b ee 6f d2 4c 1c
c7 10 2a 7d af 94 05 cb 15 d9 7a af e1 6f 75 7d 03
expanded (32 octets): 2f aa c0 8f 85 1d 35 fe a3 60 4f cb 4d e8
2d c6 2c 9b 16 4a 70 97 4d 04 62 e2 7f 1a b2 78 70 0f
{server} derive secret "tls13 s hs traffic":
PRK (32 octets): 00 5c b1 12 fd 8e b4 cc c6 23 bb 88 a0 7c 64 b3
ed e1 60 53 63 fc 7d 0d f8 c7 ce 4f f0 fb 4a e6
hash (32 octets): f7 36 cb 34 fe 25 e7 01 55 1b ee 6f d2 4c 1c c7
10 2a 7d af 94 05 cb 15 d9 7a af e1 6f 75 7d 03
info (54 octets): 00 20 12 74 6c 73 31 33 20 73 20 68 73 20 74 72
61 66 66 69 63 20 f7 36 cb 34 fe 25 e7 01 55 1b ee 6f d2 4c 1c
c7 10 2a 7d af 94 05 cb 15 d9 7a af e1 6f 75 7d 03
expanded (32 octets): fe 92 7a e2 71 31 2e 8b f0 27 5b 58 1c 54
ee f0 20 45 0d c4 ec ff aa 05 a1 a3 5d 27 51 8e 78 03
{server} derive secret for master "tls13 derived":
PRK (32 octets): 00 5c b1 12 fd 8e b4 cc c6 23 bb 88 a0 7c 64 b3
ed e1 60 53 63 fc 7d 0d f8 c7 ce 4f f0 fb 4a e6
hash (32 octets): e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24
27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
info (49 octets): 00 20 0d 74 6c 73 31 33 20 64 65 72 69 76 65 64
20 e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4
64 9b 93 4c a4 95 99 1b 78 52 b8 55
expanded (32 octets): e2 f1 60 30 25 1d f0 87 4b a1 9b 9a ba 25
76 10 bc 6d 53 1c 1d d2 06 df 0c a6 e8 4a e2 a2 67 42
{server} extract secret "master":
salt (32 octets): e2 f1 60 30 25 1d f0 87 4b a1 9b 9a ba 25 76 10
bc 6d 53 1c 1d d2 06 df 0c a6 e8 4a e2 a2 67 42
IKM (32 octets): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
secret (32 octets): e2 d3 2d 4e d6 6d d3 78 97 a0 e8 0c 84 10 75
03 ce 58 bf 8a ad 4c b5 5a 50 02 d7 7e cb 89 0e ce
{server} send handshake record:
payload (96 octets): 02 00 00 5c 03 03 3c cf d2 de c8 90 22 27 63
47 2a e8 13 67 77 c9 d7 35 87 77 bb 66 e9 1e a5 12 24 95 f5 59
ea 2d 00 13 01 00 00 34 00 29 00 02 00 00 00 33 00 24 00 1d 00
20 12 17 61 ee 42 c3 33 e1 b9 e7 7b 60 dd 57 c2 05 3c d9 45 12
ab 47 f1 15 e8 6e ff 50 94 2c ea 31 00 2b 00 02 03 04
complete record (101 octets): 16 03 03 00 60 02 00 00 5c 03 03 3c
cf d2 de c8 90 22 27 63 47 2a e8 13 67 77 c9 d7 35 87 77 bb 66
e9 1e a5 12 24 95 f5 59 ea 2d 00 13 01 00 00 34 00 29 00 02 00
00 00 33 00 24 00 1d 00 20 12 17 61 ee 42 c3 33 e1 b9 e7 7b 60
dd 57 c2 05 3c d9 45 12 ab 47 f1 15 e8 6e ff 50 94 2c ea 31 00
2b 00 02 03 04
{server} derive write traffic keys for handshake data:
PRK (32 octets): fe 92 7a e2 71 31 2e 8b f0 27 5b 58 1c 54 ee f0
20 45 0d c4 ec ff aa 05 a1 a3 5d 27 51 8e 78 03
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): 27 c6 bd c0 a3 dc ea 39 a4 73 26 d7 9b
c9 e4 ee
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): 95 69 ec dd 4d 05 36 70 5e 9e f7 25
{server} construct an EncryptedExtensions handshake message:
EncryptedExtensions (44 octets): 08 00 00 28 00 26 00 0a 00 14 00
12 00 1d 00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 1c
00 02 40 01 00 00 00 00 00 2a 00 00
{server} calculate finished "tls13 finished":
PRK (32 octets): fe 92 7a e2 71 31 2e 8b f0 27 5b 58 1c 54 ee f0
20 45 0d c4 ec ff aa 05 a1 a3 5d 27 51 8e 78 03
hash (0 octets): (empty)
info (18 octets): 00 20 0e 74 6c 73 31 33 20 66 69 6e 69 73 68 65
64 00
expanded (32 octets): 4b b7 4c ae 7a 5d c8 91 46 04 c0 bf be 2f
0c 06 23 96 88 39 22 be c8 a1 5e 2a 9b 53 2a 5d 39 2c
finished (32 octets): 48 d3 e0 e1 b3 d9 07 c6 ac ff 14 5e 16 09
03 88 c7 7b 05 c0 50 b6 34 ab 1a 88 bb d0 dd 1a 34 b2
{server} construct a Finished handshake message:
Finished (36 octets): 14 00 00 20 48 d3 e0 e1 b3 d9 07 c6 ac ff
14 5e 16 09 03 88 c7 7b 05 c0 50 b6 34 ab 1a 88 bb d0 dd 1a 34
b2
{server} send handshake record:
payload (80 octets): 08 00 00 28 00 26 00 0a 00 14 00 12 00 1d 00
17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 1c 00 02 40 01
00 00 00 00 00 2a 00 00 14 00 00 20 48 d3 e0 e1 b3 d9 07 c6 ac
ff 14 5e 16 09 03 88 c7 7b 05 c0 50 b6 34 ab 1a 88 bb d0 dd 1a
34 b2
complete record (102 octets): 17 03 03 00 61 dc 48 23 7b 4b 87 9f
50 d0 d4 d2 62 ea 8b 47 16 eb 40 dd c1 eb 95 7e 11 12 6e 8a 71
49 c2 d0 12 d3 7a 71 15 95 7e 64 ce 30 00 8b 9e 03 23 f2 c0 5a
9c 1c 77 b4 f3 78 49 a6 95 ab 25 50 60 a3 3f ee 77 0c a9 5c b8
48 6b fd 08 43 b8 70 24 86 5c a3 5c c4 1c 4e 51 5c 64 dc b1 36
9f 98 63 5b c7 a5
{server} derive secret "tls13 c ap traffic":
PRK (32 octets): e2 d3 2d 4e d6 6d d3 78 97 a0 e8 0c 84 10 75 03
ce 58 bf 8a ad 4c b5 5a 50 02 d7 7e cb 89 0e ce
hash (32 octets): b0 ae ff c4 6a 2c fe 33 11 4e 6f d7 d5 1f 9f 04
b1 ca 3c 49 7d ab 08 93 4a 77 4a 9d 9a d7 db f3
info (54 octets): 00 20 12 74 6c 73 31 33 20 63 20 61 70 20 74 72
61 66 66 69 63 20 b0 ae ff c4 6a 2c fe 33 11 4e 6f d7 d5 1f 9f
04 b1 ca 3c 49 7d ab 08 93 4a 77 4a 9d 9a d7 db f3
expanded (32 octets): 2a bb f2 b8 e3 81 d2 3d be be 1d d2 a7 d1
6a 8b f4 84 cb 49 50 d2 3f b7 fb 7f a8 54 70 62 d9 a1
{server} derive secret "tls13 s ap traffic":
PRK (32 octets): e2 d3 2d 4e d6 6d d3 78 97 a0 e8 0c 84 10 75 03
ce 58 bf 8a ad 4c b5 5a 50 02 d7 7e cb 89 0e ce
hash (32 octets): b0 ae ff c4 6a 2c fe 33 11 4e 6f d7 d5 1f 9f 04
b1 ca 3c 49 7d ab 08 93 4a 77 4a 9d 9a d7 db f3
info (54 octets): 00 20 12 74 6c 73 31 33 20 73 20 61 70 20 74 72
61 66 66 69 63 20 b0 ae ff c4 6a 2c fe 33 11 4e 6f d7 d5 1f 9f
04 b1 ca 3c 49 7d ab 08 93 4a 77 4a 9d 9a d7 db f3
expanded (32 octets): cc 21 f1 bf 8f eb 7d d5 fa 50 5b d9 c4 b4
68 a9 98 4d 55 4a 99 3d c4 9e 6d 28 55 98 fb 67 26 91
{server} derive secret "tls13 exp master":
PRK (32 octets): e2 d3 2d 4e d6 6d d3 78 97 a0 e8 0c 84 10 75 03
ce 58 bf 8a ad 4c b5 5a 50 02 d7 7e cb 89 0e ce
hash (32 octets): b0 ae ff c4 6a 2c fe 33 11 4e 6f d7 d5 1f 9f 04
b1 ca 3c 49 7d ab 08 93 4a 77 4a 9d 9a d7 db f3
info (52 octets): 00 20 10 74 6c 73 31 33 20 65 78 70 20 6d 61 73
74 65 72 20 b0 ae ff c4 6a 2c fe 33 11 4e 6f d7 d5 1f 9f 04 b1
ca 3c 49 7d ab 08 93 4a 77 4a 9d 9a d7 db f3
expanded (32 octets): 3f d9 3d 4f fd dc 98 e6 4b 14 dd 10 7a ed
f8 ee 4a dd 23 f4 51 0f 58 a4 59 2d 0b 20 1b ee 56 b4
{server} derive write traffic keys for application data:
PRK (32 octets): cc 21 f1 bf 8f eb 7d d5 fa 50 5b d9 c4 b4 68 a9
98 4d 55 4a 99 3d c4 9e 6d 28 55 98 fb 67 26 91
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): e8 57 c6 90 a3 4c 5a 91 29 d8 33 61 96
84 f9 5e
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): 06 85 d6 b5 61 aa b9 ef 10 13 fa f9
{server} derive read traffic keys for early application data (same
as client early application data write traffic keys)
{client} derive secret for handshake "tls13 derived":
PRK (32 octets): 9b 21 88 e9 b2 fc 6d 64 d7 1d c3 29 90 0e 20 bb
41 91 50 00 f6 78 aa 83 9c bb 79 7c b7 d8 33 2c
hash (32 octets): e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24
27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
info (49 octets): 00 20 0d 74 6c 73 31 33 20 64 65 72 69 76 65 64
20 e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4
64 9b 93 4c a4 95 99 1b 78 52 b8 55
expanded (32 octets): 5f 17 90 bb d8 2c 5e 7d 37 6e d2 e1 e5 2f
8e 60 38 c9 34 6d b6 1b 43 be 9a 52 f7 7e f3 99 8e 80
{client} extract secret "handshake" (same as server handshake
secret)
{client} derive secret "tls13 c hs traffic" (same as server)
{client} derive secret "tls13 s hs traffic" (same as server)
{client} derive secret for master "tls13 derived" (same as server)
{client} extract secret "master" (same as server master secret)
{client} derive read traffic keys for handshake data (same as server
handshake data write traffic keys)
{client} calculate finished "tls13 finished" (same as server)
{client} derive secret "tls13 c ap traffic" (same as server)
{client} derive secret "tls13 s ap traffic" (same as server)
{client} derive secret "tls13 exp master" (same as server)
{client} construct an EndOfEarlyData handshake message:
EndOfEarlyData (4 octets): 05 00 00 00
{client} send handshake record:
payload (4 octets): 05 00 00 00
complete record (26 octets): 17 03 03 00 15 ac a6 fc 94 48 41 29
8d f9 95 93 72 5f 9b f9 75 44 29 b1 2f 09
{client} derive write traffic keys for handshake data:
PRK (32 octets): 2f aa c0 8f 85 1d 35 fe a3 60 4f cb 4d e8 2d c6
2c 9b 16 4a 70 97 4d 04 62 e2 7f 1a b2 78 70 0f
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): b1 53 08 06 f4 ad fe ac 83 f1 41 30 32
bb fa 82
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): eb 50 c1 6b e7 65 4a bf 99 dd 06 d9
{client} derive read traffic keys for application data (same as
server application data write traffic keys)
{client} calculate finished "tls13 finished":
PRK (32 octets): 2f aa c0 8f 85 1d 35 fe a3 60 4f cb 4d e8 2d c6
2c 9b 16 4a 70 97 4d 04 62 e2 7f 1a b2 78 70 0f
hash (0 octets): (empty)
info (18 octets): 00 20 0e 74 6c 73 31 33 20 66 69 6e 69 73 68 65
64 00
expanded (32 octets): 5a ce 39 4c 26 98 0d 58 12 43 f6 27 d1 15
0a e2 7e 37 fa 52 36 4e 0a 7f 20 ac 68 6d 09 cd 0e 8e
finished (32 octets): 72 30 a9 c9 52 c2 5c d6 13 8f c5 e6 62 83
08 c4 1c 53 35 dd 81 b9 f9 6b ce a5 0f d3 2b da 41 6d
{client} construct a Finished handshake message:
Finished (36 octets): 14 00 00 20 72 30 a9 c9 52 c2 5c d6 13 8f
c5 e6 62 83 08 c4 1c 53 35 dd 81 b9 f9 6b ce a5 0f d3 2b da 41
6d
{client} send handshake record:
payload (36 octets): 14 00 00 20 72 30 a9 c9 52 c2 5c d6 13 8f c5
e6 62 83 08 c4 1c 53 35 dd 81 b9 f9 6b ce a5 0f d3 2b da 41 6d
complete record (58 octets): 17 03 03 00 35 00 f8 b4 67 d1 4c f2
2a 4b 3f 0b 6a e0 d8 e6 cc 8d 08 e0 db 35 15 ef 5c 2b df 19 22
ea fb b7 00 09 96 47 16 d8 34 fb 70 c3 d2 a5 6c 5b 1f 5f 6b db
a6 c3 33 cf
{client} derive write traffic keys for application data:
PRK (32 octets): 2a bb f2 b8 e3 81 d2 3d be be 1d d2 a7 d1 6a 8b
f4 84 cb 49 50 d2 3f b7 fb 7f a8 54 70 62 d9 a1
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): 3c f1 22 f3 01 c6 35 8c a7 98 95 53 25
0e fd 72
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): ab 1a ec 26 aa 78 b8 fc 11 76 b9 ac
{client} derive secret "tls13 res master":
PRK (32 octets): e2 d3 2d 4e d6 6d d3 78 97 a0 e8 0c 84 10 75 03
ce 58 bf 8a ad 4c b5 5a 50 02 d7 7e cb 89 0e ce
Okay bestie, we're picking up right where the key schedule left off 🧚 The hash, info, and expanded values are all next, and then the server's sending steps. Let's go 💅
hash (32 octets): c3 c1 22 e0 bd 90 7a 4a 3f f6 11 2d 8f d5 3d bf 89 c7 73 d9 55 2e 8b 6b 9d 56 d3 61 b3 a9 7b f6
info (52 octets): 00 20 10 74 6c 73 31 33 20 72 65 73 20 6d 61 73 74 65 72 20 c3 c1 22 e0 bd 90 7a 4a 3f f6 11 2d 8f d5 3d bf 89 c7 73 d9 55 2e 8b 6b 9d 56 d3 61 b3 a9 7b f6
expanded (32 octets): 5e 95 bd f1 f8 90 05 ea 2e 9a a0 ba 85 e7 28 e3 c1 9c 5f e0 c6 99 e3 f5 be e5 9f ae bd 0b 54 06
<mint>{server}</mint> derives the read traffic keys for handshake data, which are the same as the client's handshake data write traffic keys ✨
<mint>{server}</mint> calculates the finished "tls13 finished" value, same as the client does 🎀
<mint>{server}</mint> derives the read traffic keys for application data, the same as the client's application data write traffic keys 🦋
<mint>{server}</mint> derives the secret "tls13 res master", same as the client 🌸
<mint>{client}</mint> sends an application_data record 💖
payload (50 octets): 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f 30 31
complete record (72 octets): 17 03 03 00 43 b1 ce bc e2 42 aa 20 1b e9 ae 5e 1c b2 a9 aa 4b 33 d4 e8 66 af 1e db 06 89 19 23 77 41 aa 03 1d 7a 74 d4 91 c9 9b 9d 4e 23 2b 74 20 6b c6 fb aa 04 fe 78 be 44 a9 b4 f5 43 20 a1 7e b7 69 92 af ac 31 03
<mint>{server}</mint> sends an application_data record too 🫶
payload (50 octets): 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f 30 31
complete record (72 octets): 17 03 03 00 43 27 5e 9f 20 ac ff 57 bc 00 06 57 d3 86 7d f0 39 cc cf 79 04 78 84 cf 75 77 17 46 f7 40 b5 a8 3f 46 2a 09 54 c3 58 13 93 a2 03 a2 5a 7d d1 41 41 ef 1a 37 90 0c db 62 ff 62 de e1 ba 39 ab 25 90 cb f1 94
<mint>{client}</mint> sends an alert record, and the payload is just two little octets 🙈
payload (2 octets): 01 00
complete record (24 octets): 17 03 03 00 13 0f ac ce 32 46 bd fc 63 69 83 8d 6a 82 ae 6d e5 d4 22 dc
<mint>{server}</mint> sends an alert record too, same payload and all 💀
payload (2 octets): 01 00
complete record (24 octets): 17 03 03 00 13 5b 18 af 44 4e 8e 1e ec 71 58 fb 62 d8 f2 57 7d 37 ba 5d
---
# 5. HelloRetryRequest ✨
Okay so here's the plot twist 👑 The client opens the handshake with an X25519 [RFC7748] key share, but the server is like "nah, I prefer P-256 [FIPS.186-4.2013]." So it sends a HelloRetryRequest that basically says "go make a key share on the P-256 curve, please and thank you" 🦋
> Heads up: the HelloRetryRequest uses the same handshake message type as a ServerHello, so that's why it's labeled as ServerHello in this example 🙈
<mint>{client}</mint> creates an ephemeral x25519 key pair 🌈
private key (32 octets): 0e d0 2f 8e 81 17 ef c7 5c a7 ac 32 aa 7e 34 ed a6 4c dc 0d da d1 54 a5 e8 52 89 f9 59 f6 32 04
public key (32 octets): e8 e8 e3 f3 b9 3a 25 ed 97 a1 4a 7d ca cb 8a 27 2c 62 88 e5 85 c6 48 4d 05 26 2f ca d0 62 ad 1f
<mint>{client}</mint> constructs a ClientHello handshake message 💜
ClientHello (180 octets): 01 00 00 b0 03 03 b0 b1 c5 a5 aa 37 c5 91 9f 2e d1 d5 c6 ff f7 fc b7 84 97 16 94 5a 2b 8c ee 92 58 a3 46 67 7b 6f 00 00 06 13 01 13 03 13 02 01 00 00 81 00 00 00 0b 00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 08 00 06 00 1d 00 17 00 18 00 33 00 26 00 24 00 1d 00 20 e8 e8 e3 f3 b9 3a 25 ed 97 a1 4a 7d ca cb 8a 27 2c 62 88 e5 85 c6 48 4d 05 26 2f ca d0 62 ad 1f 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02 02 02 00 2d 00 02 01 01 00 1c 00 02 40 01
<mint>{client}</mint> sends the handshake record 🍓
payload (180 octets): 01 00 00 b0 03 03 b0 b1 c5 a5 aa 37 c5 91 9f 2e d1 d5 c6 ff f7 fc b7 84 97 16 94 5a 2b 8c ee 92 58 a3 46 67 7b 6f 00 00 06 13 01 13 03 13 02 01 00 00 81 00 00 00 0b 00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 08 00 06 00 1d 00 17 00 18 00 33 00 26 00 24 00 1d 00 20 e8 e8 e3 f3 b9 3a 25 ed 97 a1 4a 7d ca cb 8a 27 2c 62 88 e5 85 c6 48 4d 05 26 2f ca d0 62 ad 1f 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02 02 02 00 2d 00 02 01 01 00 1c 00 02 40 01
complete record (185 octets): 16 03 01 00 b4 01 00 00 b0 03 03 b0 b1 c5 a5 aa 37 c5 91 9f 2e d1 d5 c6 ff f7 fc b7 84 97 16 94 5a 2b 8c ee 92 58 a3 46 67 7b 6f 00 00 06 13 01 13 03 13 02 01 00 00 81 00 00 00 0b 00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 08 00 06 00 1d 00 17 00 18 00 33 00 26 00 24 00 1d 00 20 e8 e8 e3 f3 b9 3a 25 ed 97 a1 4a 7d ca cb 8a 27 2c 62 88 e5 85 c6 48 4d 05 26 2f ca d0 62 ad 1f 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02 02 02 00 2d 00 02 01 01 00 1c 00 02 40 01
<mint>{server}</mint> constructs a ServerHello handshake message, which here is really the HelloRetryRequest 🧚
ServerHello (176 octets): 02 00 00 ac 03 03 cf 21 ad 74 e5 9a 61 11 be 1d 8c 02 1e 65 b8 91 c2 a2 11 16 7a bb 8c 5e 07 9e 09 e2 c8 a8 33 9c 00 13 01 00 00 84 00 33 00 02 00 17 00 2c 00 74 00 72 71 dc d0 4b b8 8b c3 18 91 19 39 8a 00 00 00 00 ee fa fc 76 c1 46 b8 23 b0 96 f8 aa ca d3 65 dd 00 30 95 3f 4e df 62 56 36 e5 f2 1b b2 e2 3f cc 65 4b 1b 5b 40 31 8d 10 d1 37 ab cb b8 75 74 e3 6e 8a 1f 02 5f 7d fa 5d 6e 50 78 1b 5e da 4a a1 5b 0c 8b e7 78 25 7d 16 aa 30 30 e9 e7 84 1d d9 e4 c0 34 22 67 e8 ca 0c af 57 1f b2 b7 cf f0 f9 34 b0 00 2b 00 02 03 04
<mint>{server}</mint> sends the handshake record 💅
payload (176 octets): 02 00 00 ac 03 03 cf 21 ad 74 e5 9a 61 11 be 1d 8c 02 1e 65 b8 91 c2 a2 11 16 7a bb 8c 5e 07 9e 09 e2 c8 a8 33 9c 00 13 01 00 00 84 00 33 00 02 00 17 00 2c 00 74 00 72 71 dc d0 4b b8 8b c3 18 91 19 39 8a 00 00 00 00 ee fa fc 76 c1 46 b8 23 b0 96 f8 aa ca d3 65 dd 00 30 95 3f 4e df 62 56 36 e5 f2 1b b2 e2 3f cc 65 4b 1b 5b 40 31 8d 10 d1 37 ab cb b8 75 74 e3 6e 8a 1f 02 5f 7d fa 5d 6e 50 78 1b 5e da 4a a1 5b 0c 8b e7 78 25 7d 16 aa 30 30 e9 e7 84 1d d9 e4 c0 34 22 67 e8 ca 0c af 57 1f b2 b7 cf f0 f9 34 b0 00 2b 00 02 03 04
complete record (181 octets): 16 03 03 00 b0 02 00 00 ac 03 03 cf 21 ad 74 e5 9a 61 11 be 1d 8c 02 1e 65 b8 91 c2 a2 11 16 7a bb 8c 5e 07 9e 09 e2 c8 a8 33 9c 00 13 01 00 00 84 00 33 00 02 00 17 00 2c 00 74 00 72 71 dc d0 4b b8 8b c3 18 91 19 39 8a 00 00 00 00 ee fa fc 76 c1 46 b8 23 b0 96 f8 aa ca d3 65 dd 00 30 95 3f 4e df 62 56 36 e5 f2 1b b2 e2 3f cc 65 4b 1b 5b 40 31 8d 10 d1 37 ab cb b8 75 74 e3 6e 8a 1f 02 5f 7d fa 5d 6e 50 78 1b 5e da 4a a1 5b 0c 8b e7 78 25 7d 16 aa 30 30 e9 e7 84 1d d9 e4 c0 34 22 67 e8 ca 0c af 57 1f b2 b7 cf f0 f9 34 b0 00 2b 00 02 03 04
<mint>{client}</mint> creates an ephemeral P-256 key pair now, because it's getting the curve it asked for 🌸
private key (32 octets): ab 54 73 46 7e 19 34 6c eb 0a 04 14 e4 1d a2 1d 4d 24 45 bc 30 25 af e9 7c 4e 8d c8 d5 13 da 39
public key (65 octets): 04 a6 da 73 92 ec 59 1e 17 ab fd 53 59 64 b9 98 94 d1 3b ef b2 21 b3 de f2 eb e3 83 0e ac 8f 01 51 81 26 77 c4 d6 d2 23 7e 85 cf 01 d6 91 0c fb 83 95 4e 76 ba 73 52 83 05 34 15 98 97 e8 06 57 80
<mint>{client}</mint> constructs a second ClientHello handshake message, with the P-256 share in it 🦋
ClientHello (512 octets): 01 00 01 fc 03 03 b0 b1 c5 a5 aa 37 c5 91 9f 2e d1 d5 c6 ff f7 fc b7 84 97 16 94 5a 2b 8c ee 92 58 a3 46 67 7b 6f 00 00 06 13 01 13 03 13 02 01 00 01 cd 00 00 00 0b 00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 08 00 06 00 1d 00 17 00 18 00 33 00 47 00 45 00 17 00 41 04 a6 da 73 92 ec 59 1e 17 ab fd 53 59 64 b9 98 94 d1 3b ef b2 21 b3 de f2 eb e3 83 0e ac 8f 01 51 81 26 77 c4 d6 d2 23 7e 85 cf 01 d6 91 0c fb 83 95 4e 76 ba 73 52 83 05 34 15 98 97 e8 06 57 80 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02 02 02 00 2c 00 74 00 72 71 dc d0 4b b8 8b c3 18 91 19 39 8a 00 00 00 00 ee fa fc 76 c1 46 b8 23 b0 96 f8 aa ca d3 65 dd 00 30 95 3f 4e df 62 56 36 e5 f2 1b b2 e2 3f cc 65 4b 1b 5b 40 31 8d 10 d1 37 ab cb b8 75 74 e3 6e 8a 1f 02 5f 7d fa 5d 6e 50 78 1b 5e da 4a a1 5b 0c 8b e7 78 25 7d 16 aa 30 30 e9 e7 84 1d d9 e4 c0 34 22 67 e8 ca 0c af 57 1f b2 b7 cf f0 f9 34 b0 00 2d 00 02 01 01 00 1c 00 02 40 01 00 15 00 af 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
<mint>{client}</mint> sends the handshake record, which is the big one 🌈
payload (512 octets): 01 00 01 fc 03 03 b0 b1 c5 a5 aa 37 c5 91 9f 2e d1 d5 c6 ff f7 fc b7 84 97 16 94 5a 2b 8c ee 92 58 a3 46 67 7b 6f 00 00 06 13 01 13 03 13 02 01 00 01 cd 00 00 00 0b 00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 08 00 06 00 1d 00 17 00 18 00 33 00 47 00 45 00 17 00 41 04 a6 da 73 92 ec 59 1e 17 ab fd 53 59 64 b9 98 94 d1 3b ef b2 21 b3 de f2 eb e3 83 0e ac 8f 01 51 81 26 77 c4 d6 d2 23 7e 85 cf 01 d6 91 0c fb 83 95 4e 76 ba 73 52 83 05 34 15 98 97 e8 06 57 80 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02 02 02 00 2c 00 74 00 72 71 dc d0 4b b8 8b c3 18 91 19 39 8a 00 00 00 00 ee fa fc 76 c1 46 b8 23 b0 96 f8 aa ca d3 65 dd 00 30 95 3f 4e df 62 56 36 e5 f2 1b b2 e2 3f cc 65 4b 1b 5b 40 31 8d 10 d1 37 ab cb b8 75 74 e3 6e 8a 1f 02 5f 7d fa 5d 6e 50 78 1b 5e da 4a a1 5b 0c 8b e7 78 25 7d 16 aa 30 30 e9 e7 84 1d d9 e4 c0 34 22 67 e8 ca 0c af 57 1f b2 b7 cf f0 f9 34 b0 00 2d 00 02 01 01 00 1c 00 02 40 01 00 15 00 af 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
complete record (517 octets): 16 03 03 02 00 01 00 01 fc 03 03 b0 b1 c5 a5 aa 37 c5 91 9f 2e d1 d5 c6 ff f7 fc b7 84 97 16 94 5a 2b 8c ee 92 58 a3 46 67 7b 6f 00 00 06 13 01 13 03 13 02 01 00 01 cd 00 00 00 0b 00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 08 00 06 00 1d 00 17 00 18 00 33 00 47 00 45 00 17 00 41 04 a6 da 73 92 ec 59 1e 17 ab fd 53 59 64 b9 98 94 d1 3b ef b2 21 b3 de f2 eb e3 83 0e ac 8f 01 51 81 26 77 c4 d6 d2 23 7e 85 cf 01 d6 91 0c fb 83 95 4e 76 ba 73 52 83 05 34 15 98 97 e8 06 57 80 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02 02 02 00 2c 00 74 00 72 71 dc d0 4b b8 8b c3 18 91 19 39 8a 00 00 00 00 ee fa fc 76 c1 46 b8 23 b0 96 f8 aa ca d3 65 dd 00 30 95 3f 4e df 62 56 36 e5 f2 1b b2 e2 3f cc 65 4b 1b 5b 40 31 8d 10 d1 37 ab cb b8 75 74 e3 6e 8a 1f 02 5f 7d fa 5d 6e 50 78 1b 5e da 4a a1 5b 0c 8b e7 78 25 7d 16 aa 30 30 e9 e7 84 1d d9 e4 c0 34 22 67 e8 ca 0c af 57 1f b2 b7 cf f0 f9 34 b0 00 2d 00 02 01 01 00 1c 00 02 40 01 00 15 00 af 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
okay bestie, the server is officially cooking up its secrets now 🔐✨ first up is the "early" extract step 🧚
{server} extract secret "early":
salt: 0 (all zero octets)
IKM (32 octets): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
secret (32 octets): 33 ad 0a 1c 60 7e c0 3b 09 e6 cd 98 93 68 0c e2 10 ad f3 00 aa 1f 26 60 e1 b2 2e 10 f1 70 f9 2a
{server} create an ephemeral P-256 key pair:
private key (32 octets): 8c 51 06 01 f9 76 5b fb 8e d6 93 44 9a 48 98 98 59 b5 cf a8 79 cb 9f 54 43 c4 1c 5f f1 06 34 ed
public key (65 octets): 04 58 3e 05 4b 7a 66 67 2a e0 20 ad 9d 26 86 fc c8 5b 5a d4 1a 13 4a 0f 03 ee 72 b8 93 05 2b d8 5b 4c 8d e6 77 6f 5b 04 ac 07 d8 35 40 ea b3 e3 d9 c5 47 bc 65 28 c4 31 7d 29 46 86 09 3a 6c ad 7d
{server} construct a ServerHello handshake message:
ServerHello (123 octets): 02 00 00 77 03 03 bb 34 1d 84 7f d7 89 c4 7c 38 71 72 dc 0c 9b f1 47 fc ca cb 50 43 d8 6c a4 c5 98 d3 ff 57 1b 98 00 13 01 00 00 4f 00 33 00 45 00 17 00 41 04 58 3e 05 4b 7a 66 67 2a e0 20 ad 9d 26 86 fc c8 5b 5a d4 1a 13 4a 0f 03 ee 72 b8 93 05 2b d8 5b 4c 8d e6 77 6f 5b 04 ac 07 d8 35 40 ea b3 e3 d9 c5 47 bc 65 28 c4 31 7d 29 46 86 09 3a 6c ad 7d 00 2b 00 02 03 04
{server} derive secret for handshake "tls13 derived":
PRK (32 octets): 33 ad 0a 1c 60 7e c0 3b 09 e6 cd 98 93 68 0c e2 10 ad f3 00 aa 1f 26 60 e1 b2 2e 10 f1 70 f9 2a
hash (32 octets): e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
info (49 octets): 00 20 0d 74 6c 73 31 33 20 64 65 72 69 76 65 64 20 e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
expanded (32 octets): 6f 26 15 a1 08 c7 02 c5 67 8f 54 fc 9d ba b6 97 16 c0 76 18 9c 48 25 0c eb ea c3 57 6c 36 11 ba
{server} extract secret "handshake":
salt (32 octets): 6f 26 15 a1 08 c7 02 c5 67 8f 54 fc 9d ba b6 97 16 c0 76 18 9c 48 25 0c eb ea c3 57 6c 36 11 ba
IKM (32 octets): c1 42 ce 13 ca 11 b5 c2 23 36 52 e6 3a d3 d9 78 44 f1 62 1f bf b9 de 69 d5 47 dc 8f ed ea be b4
secret (32 octets): ce 02 2e 5e 6e 81 e5 07 36 d7 73 f2 d3 ad fc e8 22 0d 04 9b f5 10 f0 db fa c9 27 ef 42 43 b1 48
{server} derive secret "tls13 c hs traffic":
PRK (32 octets): ce 02 2e 5e 6e 81 e5 07 36 d7 73 f2 d3 ad fc e8 22 0d 04 9b f5 10 f0 db fa c9 27 ef 42 43 b1 48
hash (32 octets): 8a a8 e8 28 ec 2f 8a 88 4f ec 95 a3 13 9d e0 1c 15 a3 da a7 ff 5b fc 3f 4b fc c2 1b 43 8d 7b f8
info (54 octets): 00 20 12 74 6c 73 31 33 20 63 20 68 73 20 74 72 61 66 66 69 63 20 8a a8 e8 28 ec 2f 8a 88 4f ec 95 a3 13 9d e0 1c 15 a3 da a7 ff 5b fc 3f 4b fc c2 1b 43 8d 7b f8
expanded (32 octets): 15 8a a7 ab 88 55 07 35 82 b4 1d 67 4b 40 55 ca bc c5 34 72 8f 65 93 14 86 1b 4e 08 e2 01 15 66
{server} derive secret "tls13 s hs traffic":
PRK (32 octets): ce 02 2e 5e 6e 81 e5 07 36 d7 73 f2 d3 ad fc e8 22 0d 04 9b f5 10 f0 db fa c9 27 ef 42 43 b1 48
hash (32 octets): 8a a8 e8 28 ec 2f 8a 88 4f ec 95 a3 13 9d e0 1c 15 a3 da a7 ff 5b fc 3f 4b fc c2 1b 43 8d 7b f8
info (54 octets): 00 20 12 74 6c 73 31 33 20 73 20 68 73 20 74 72 61 66 66 69 63 20 8a a8 e8 28 ec 2f 8a 88 4f ec 95 a3 13 9d e0 1c 15 a3 da a7 ff 5b fc 3f 4b fc c2 1b 43 8d 7b f8
expanded (32 octets): 34 03 e7 81 e2 af 7b 65 08 da 28 57 4f 6e 95 a1 ab f1 62 de 83 a9 79 27 c3 76 72 a4 a0 ce f8 a1
{server} derive secret for master "tls13 derived":
PRK (32 octets): ce 02 2e 5e 6e 81 e5 07 36 d7 73 f2 d3 ad fc e8 22 0d 04 9b f5 10 f0 db fa c9 27 ef 42 43 b1 48
hash (32 octets): e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
info (49 octets): 00 20 0d 74 6c 73 31 33 20 64 65 72 69 76 65 64 20 e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
expanded (32 octets): ad 1c bc d3 a0 dc 70 53 ee b3 ed 3a 47 90 1d 16 a9 fc 63 a7 3c 64 be b5 67 48 1a 7d fb 3a 2c b3
{server} extract secret "master":
salt (32 octets): ad 1c bc d3 a0 dc 70 53 ee b3 ed 3a 47 90 1d 16 a9 fc 63 a7 3c 64 be b5 67 48 1a 7d fb 3a 2c b3
IKM (32 octets): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
secret (32 octets): 11 31 54 5d 0b af 79 dd ce 9b 87 f0 69 45 78 1a 57 dd 18 ef 37 8d cd 20 60 f8 f9 a5 69 02 7e d8
{server} send handshake record:
payload (123 octets): 02 00 00 77 03 03 bb 34 1d 84 7f d7 89 c4 7c 38 71 72 dc 0c 9b f1 47 fc ca cb 50 43 d8 6c a4 c5 98 d3 ff 57 1b 98 00 13 01 00 00 4f 00 33 00 45 00 17 00 41 04 58 3e 05 4b 7a 66 67 2a e0 20 ad 9d 26 86 fc c8 5b 5a d4 1a 13 4a 0f 03 ee 72 b8 93 05 2b d8 5b 4c 8d e6 77 6f 5b 04 ac 07 d8 35 40 ea b3 e3 d9 c5 47 bc 65 28 c4 31 7d 29 46 86 09 3a 6c ad 7d 00 2b 00 02 03 04
complete record (128 octets): 16 03 03 00 7b 02 00 00 77 03 03 bb 34 1d 84 7f d7 89 c4 7c 38 71 72 dc 0c 9b f1 47 fc ca cb 50 43 d8 6c a4 c5 98 d3 ff 57 1b 98 00 13 01 00 00 4f 00 33 00 45 00 17 00 41 04 58 3e 05 4b 7a 66 67 2a e0 20 ad 9d 26 86 fc c8 5b 5a d4 1a 13 4a 0f 03 ee 72 b8 93 05 2b d8 5b 4c 8d e6 77 6f 5b 04 ac 07 d8 35 40 ea b3 e3 d9 c5 47 bc 65 28 c4 31 7d 29 46 86 09 3a 6c ad 7d 00 2b 00 02 03 04
{server} derive write traffic keys for handshake data:
PRK (32 octets): 34 03 e7 81 e2 af 7b 65 08 da 28 57 4f 6e 95 a1 ab f1 62 de 83 a9 79 27 c3 76 72 a4 a0 ce f8 a1
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): 46 46 bf ac 17 12 c4 26 cd 78 d8 a2 4a 8a 6f 6b
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): c7 d3 95 c0 8d 62 f2 97 d1 37 68 ea
{server} construct an EncryptedExtensions handshake message:
EncryptedExtensions (28 octets): 08 00 00 18 00 16 00 0a 00 08 00 06 00 17 00 18 00 1d 00 1c 00 02 40 01 00 00 00 00
{server} construct a Certificate handshake message:
Certificate (445 octets): 0b 00 01 b9 00 00 01 b5 00 01 b0 30 82 01 ac 30 82 01 15 a0 03 02 01 02 02 01 02 30 0d 06 09 2a 86 48 86 f7 0d 01 01 0b 05 00 30 0e 31 0c 30 0a 06 03 55 04 03 13 03 72 73 61 30 1e 17 0d 31 36 30 37 33 30 30 31 32 33 35 39 5a 17 0d 32 36 30 37 33 30 30 31 32 33 35 39 5a 30 0e 31 0c 30 0a 06 03 55 04 03 13 03 72 73 61 30 81 9f 30 0d 06 09 2a 86 48 86 f7 0d 01 01 01 05 00 03 81 8d 00 30 81 89 02 81 81 00 b4 bb 49 8f 82 79 30 3d 98 08 36 39 9b 36 c6 98 8c 0c 68 de 55 e1 bd b8 26 d3 90 1a 24 61 ea fd 2d e4 9a 91 d0 15 ab bc 9a 95 13 7a ce 6c 1a f1 9e aa 6a f9 8c 7c ed 43 12 09 98 e1 87 a8 0e e0 cc b0 52 4b 1b 01 8c 3e 0b 63 26 4d 44 9a 6d 38 e2 2a 5f da 43 08 46 74 80 30 53 0e f0 46 1c 8c a9 d9 ef bf ae 8e a6 d1 d0 3e 2b d1 93 ef f0 ab 9a 80 02 c4 74 28 a6 d3 5a 8d 88 d7 9f 7f 1e 3f 02 03 01 00 01 a3 1a 30 18 30 09 06 03 55 1d 13 04 02 30 00 30 0b 06 03 55 1d 0f 04 04 03 02 05 a0 30 0d 06 09 2a 86 48 86 f7 0d 01 01 0b 05 00 03 81 81 00 85 aa d2 a0 e5 b9 27 6b 90 8c 65 f7 3a 72 67 17 06 18 a5 4c 5f 8a 7b 33 7d 2d f7 a5 94 36 54 17 f2 ea e8 f8 a5 8c 8f 81 72 f9 31 9c f3 6b 7f d6 c5 5b 80 f2 1a 03 01 51 56 72 60 96 fd 33 5e 5e 67 f2 db f1 02 70 2e 60 8c ca e6 be c1 fc 63 a4 2a 99 be 5c 3e b7 10 7c 3c 54 e9 b9 eb 2b d5 20 3b 1c 3b 84 e0 a8 b2 f7 59 40 9b a3 ea c9 d9 1d 40 2d cc 0c c8 f8 96 12 29 ac 91 87 b4 2b 4d e1 00 00
{server} construct a CertificateVerify handshake message:
CertificateVerify (136 octets): 0f 00 00 84 08 04 00 80 33 ab 13 d4 46 27 07 23 1b 5d ca e6 c8 19 0b 63 d1 da bc 74 f2 8c 39 53 70 da 0b 07 e5 b8 30 66 d0 24 6a 31 ac d9 5d f4 75 bf d7 99 a4 a7 0d 33 ad 93 d3 a3 17 a9 b2 c0 d2 37 a5 68 5b 21 9e 77 41 12 e3 91 a2 47 60 7d 1a ef f1 bb d0 a3 9f 38 2e e1 a5 fe 88 ae 99 ec 59 22 8e 64 97 e4 5d 48 ce 27 5a 6d 5e f4 0d 16 9f b6 f9 d3 3b 05 2e d3 dc dd 6b 5a 48 ba af ff bc b2 90 12 84 15 bd 38
{server} calculate finished "tls13 finished":
PRK (32 octets): 34 03 e7 81 e2 af 7b 65 08 da 28 57 4f 6e 95 a1 ab f1 62 de 83 a9 79 27 c3 76 72 a4 a0 ce f8 a1
hash (0 octets): (empty)
info (18 octets): 00 20 0e 74 6c 73 31 33 20 66 69 6e 69 73 68 65 64 00
expanded (32 octets): e7 f8 bb 3e a4 b6 c3 0c 47 10 b3 d0 9c 33 13 65 81 17 e7 0b 09 7e 85 03 68 e2 51 0c a5 63 1f 74
finished (32 octets): 88 63 e6 bf b0 42 0a 92 7f a2 7f 34 33 6a 70 ae 42 6e 96 8e 3e b8 84 94 5b 96 85 6d ba 39 76 d1
{server} construct a Finished handshake message:
Finished (36 octets): 14 00 00 20 88 63 e6 bf b0 42 0a 92 7f a2 7f 34 33 6a 70 ae 42 6e 96 8e 3e b8 84 94 5b 96 85 6d ba 39 76 d1
{server} send handshake record:
payload (645 octets): 08 00 00 18 00 16 00 0a 00 08 00 06 00 17 00 18 00 1d 00 1c 00 02 40 01 00 00 00 00 0b 00 01 b9 00 00 01 b5 00 01 b0 30 82 01 ac 30 82 01 15 a0 03 02 01 02 02 01 02 30 0d 06 09 2a 86 48 86 f7 0d 01 01 0b 05 00 30 0e 31 0c 30 0a 06 03 55 04 03 13 03 72 73 61 30 1e 17 0d 31 36 30 37 33 30 30 31 32 33 35 39 5a 17 0d 32 36 30 37 33 30 30 31 32 33 35 39 5a 30 0e 31 0c 30 0a 06 03 55 04 03 13 03 72 73 61 30 81 9f 30 0d 06 09 2a 86 48 86 f7 0d 01 01 01 05 00 03 81 8d 00 30 81 89 02 81 81 00 b4 bb 49 8f 82 79 30 3d 98 08 36 39 9b 36 c6 98 8c 0c 68 de 55 e1 bd b8 26 d3 90 1a 24 61 ea fd 2d e4 9a 91 d0 15 ab bc 9a 95 13 7a ce 6c 1a f1 9e aa 6a f9 8c 7c ed 43 12 09 98 e1 87 a8 0e e0 cc b0 52 4b 1b 01 8c 3e 0b 63 26 4d 44 9a 6d 38 e2 2a 5f da 43 08 46 74 80 30 53 0e f0 46 1c 8c a9 d9 ef bf ae 8e a6 d1 d0 3e 2b d1 93 ef f0 ab 9a 80 02 c4 74 28 a6 d3 5a 8d 88 d7 9f 7f 1e 3f 02 03 01 00 01 a3 1a 30 18 30 09 06 03 55 1d 13 04 02 30 00 30 0b 06 03 55 1d 0f 04 04 03 02 05 a0 30 0d 06 09 2a 86 48 86 f7 0d 01 01 0b 05 00 03 81 81 00 85 aa d2 a0 e5 b9 27 6b 90 8c 65 f7 3a 72 67 17 06 18 a5 4c 5f 8a 7b 33 7d 2d f7 a5 94 36 54 17 f2 ea e8 f8 a5 8c 8f 81 72 f9 31 9c f3 6b 7f d6 c5 5b 80 f2 1a 03 01 51 56 72 60 96 fd 33 5e 5e 67 f2 db f1 02 70 2e 60 8c ca e6 be c1 fc 63 a4 2a 99 be 5c 3e b7 10 7c 3c 54 e9 b9 eb 2b d5 20 3b 1c 3b 84 e0 a8 b2 f7 59 40 9b a3 ea c9 d9 1d 40 2d cc 0c c8 f8 96 12 29 ac 91 87 b4 2b 4d e1 00 00 0f 00 00 84 08 04 00 80 33 ab 13 d4 46 27 07 23 1b 5d ca e6 c8 19 0b 63 d1 da bc 74 f2 8c 39 53 70 da 0b 07 e5 b8 30 66 d0 24 6a 31 ac d9 5d f4 75 bf d7 99 a4 a7 0d 33 ad 93 d3 a3 17 a9 b2 c0 d2 37 a5 68 5b 21 9e 77 41 12 e3 91 a2 47 60 7d 1a ef f1 bb d0 a3 9f 38 2e e1 a5 fe 88 ae 99 ec 59 22 8e 64 97 e4 5d 48 ce 27 5a 6d 5e f4 0d 16 9f b6 f9 d3 3b 05 2e d3 dc dd 6b 5a 48 ba af ff bc b2 90 12 84 15 bd 38 14 00 00 20 88 63 e6 bf b0 42 0a 92 7f a2 7f 34 33 6a 70 ae 42 6e 96 8e 3e b8 84 94 5b 96 85 6d ba 39 76 d1
complete record (667 octets): 17 03 03 02 96 99 be e2 0b af 5b 7f c7 27 bf ab 62 23 92 8a 38 1e 6d 0c f9 c4 da 65 3f 9d 2a 7b 23 f7 de 11 cc e8 42 d5 cf 75 63 17 63 45 0f fb 8b 0c c1 d2 38 e6 58 af 7a 12 ad c8 62 43 11 4a b1 4a 1d a2 fa e4 26 21 ce 48 3f b6 24 2e ab fa ad 52 56 6b 02 b3 1d 2e dd ed ef eb 80 e6 6a 99 00 d5 f9 73 b4 0c 4f df 74 71 9e cf 1b 68 d7 f9 c3 b6 ce b9 03 ca 13 dd 1b b8 f8 18 7a e3 34 17 e1 d1 52 52 2c 58 22 a1 a0 3a d5 2c 83 8c 55 95 3d 61 02 22 87 4c ce 8e 17 90 b2 29 a2 aa 0b 53 c8 d3 77 ee 72 01 82 95 1d c6 18 1d c5 d9 0b d1 f0 10 5e d1 e8 4a a5 f7 59 57 c6 66 18 97 07 9e 5e a5 00 74 49 e3 19 7b dc 7c 9b ee ed dd ea fd d8 44 af a5 c3 15 ec fe 65 e5 76 af e9 09 81 28 80 62 0e c7 04 8b 42 d7 f5 c7 8d 76 f2 99 d6 d8 25 34 bd d8 f5 12 fe bc 0e d3 81 4a ca 47 0c d8 00 0d 3e 1c b9 96 2b 05 2f bb 95 0d f6 83 a5 2c 2b a7 7e d3 71 3b 12 29 37 a6 e5 17 09 64 e2 ab 79 69 dc d9 80 b3 db 9b 45 8d a7 60 31 24 d6 dc 00 5e 4d 6e 04 b4 d0 c4 ba f3 27 5d b8 27 db ba 0a 6d b0 96 72 17 1f c0 57 b3 85 1d 7e 02 68 41 e2 97 8f bd 23 46 bb ef dd 03 76 bb 11 08 fe 9a cc 92 18 9f 56 50 aa 5e 85 d8 e8 c7 b6 7a c5 10 db a0 03 d3 d7 e1 63 50 bb 66 d4 50 13 ef d4 4c 9b 60 7c 0d 31 8c 4c 7d 1a 1f 5c bc 57 e2 06 11 80 4e 37 87 d7 b4 a4 b5 f0 8e d8 fd 70 bd ae ad e0 22 60 b1 2a b8 42 ef 69 0b 4a 3e e7 91 1e 84 1b 37 4e cd 5e bb bc 2a 54 d0 47 b6 00 33 6d d7 d0 c8 8b 4b c1 0e 58 ee 6c b6 56 de 72 47 fa 20 d8 e9 1d eb 84 62 86 08 cf 80 61 5b 62 e9 6c 14 91 c7 ac 37 55 eb 69 01 40 5d 34 74 fe 1a c7 9d 10 6a 0c ee 56 c2 57 7f c8 84 80 f9 6c b6 b8 c6 81 b7 b6 8b 53 c1 46 09 39 08 f3 50 88 81 75 bd fb 0b 1e 31 ad 61 e3 0b a0 ad fe 6d 22 3a a0 3c 07 83 b5 00 1a 57 58 7c 32 8a 9a fc fc fb 97 8d 1c d4 32 8f 7d 9d 60 53 0e 63 0b ef d9 6c 0c 81 6e e2 0b 01 00 76 8a e2 a6 df 51 fc 68 f1 72 74 0a 79 af 11 39 8e e3 be 12 52 49 1f a9 c6 93 47 9e 87 7f 94 ab 7c 5f 8c ad 48 02 03 e6 ab 7b 87 dd 71 e8 a0 72 91 13 df 17 f5 ee e8 6c e1 08 d1 d7 20 07 ec 1c d1 3c 85 a6 c1 49 62 1e 77 b7 d7 8d 80 5a 30 f0 be 03 0c 31 5e 54
<mint>okay the server is cooking up its application traffic keys now 🔥✨ this part is giving pure cryptography main character energy 💅</mint>
{server} derive secret "tls13 c ap traffic":
PRK (32 octets): 11 31 54 5d 0b af 79 dd ce 9b 87 f0 69 45 78 1a 57 dd 18 ef 37 8d cd 20 60 f8 f9 a5 69 02 7e d8
hash (32 octets): 50 f6 3c bf 36 b0 dd 04 9e 7a 0b a2 7d 64 55 74 5e a2 aa ac 54 bb 16 7f 99 50 b2 b7 ce 95 09 da
info (54 octets): 00 20 12 74 6c 73 31 33 20 63 20 61 70 20 74 72 61 66 66 69 63 20 50 f6 3c bf 36 b0 dd 04 9e 7a 0b a2 7d 64 55 74 5e a2 aa ac 54 bb 16 7f 99 50 b2 b7 ce 95 09 da
expanded (32 octets): 75 ec f4 b9 72 52 5a a0 dc d0 57 c9 94 4d 4c d5 d8 26 71 d8 84 31 41 d7 dc 2a 4f f1 5a 21 dc 51
{server} derive secret "tls13 s ap traffic":
PRK (32 octets): 11 31 54 5d 0b af 79 dd ce 9b 87 f0 69 45 78 1a 57 dd 18 ef 37 8d cd 20 60 f8 f9 a5 69 02 7e d8
hash (32 octets): 50 f6 3c bf 36 b0 dd 04 9e 7a 0b a2 7d 64 55 74 5e a2 aa ac 54 bb 16 7f 99 50 b2 b7 ce 95 09 da
info (54 octets): 00 20 12 74 6c 73 31 33 20 73 20 61 70 20 74 72 61 66 66 69 63 20 50 f6 3c bf 36 b0 dd 04 9e 7a 0b a2 7d 64 55 74 5e a2 aa ac 54 bb 16 7f 99 50 b2 b7 ce 95 09 da
expanded (32 octets): 5c 74 f8 7d f0 42 25 db 0f 82 09 c9 de 64 29 e4 94 35 fd ef a7 ca d6 18 64 87 4d 12 f3 1c fc 8d
{server} derive secret "tls13 exp master":
PRK (32 octets): 11 31 54 5d 0b af 79 dd ce 9b 87 f0 69 45 78 1a 57 dd 18 ef 37 8d cd 20 60 f8 f9 a5 69 02 7e d8
hash (32 octets): 50 f6 3c bf 36 b0 dd 04 9e 7a 0b a2 7d 64 55 74 5e a2 aa ac 54 bb 16 7f 99 50 b2 b7 ce 95 09 da
info (52 octets): 00 20 10 74 6c 73 31 33 20 65 78 70 20 6d 61 73 74 65 72 20 50 f6 3c bf 36 b0 dd 04 9e 7a 0b a2 7d 64 55 74 5e a2 aa ac 54 bb 16 7f 99 50 b2 b7 ce 95 09 da
expanded (32 octets): 7c 06 d3 ae 10 6a 3a 37 4a ce 48 37 b3 98 5c ac 67 78 0a 6e 2c 5c 04 b5 83 19 d5 84 df 09 d2 23
{server} derive write traffic keys for application data:
PRK (32 octets): 5c 74 f8 7d f0 42 25 db 0f 82 09 c9 de 64 29 e4 94 35 fd ef a7 ca d6 18 64 87 4d 12 f3 1c fc 8d
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): f2 7a 5d 97 bd 25 55 0c 48 23 b0 f3 e5 d2 93 88
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00 iv expanded (12 octets): 0d d6 31 f7 b7 1c bb c7 97 c3 5f e7
{server} derive read traffic keys for handshake data:
PRK (32 octets): 15 8a a7 ab 88 55 07 35 82 b4 1d 67 4b 40 55 ca bc c5 34 72 8f 65 93 14 86 1b 4e 08 e2 01 15 66
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): 2f 1f 91 86 63 d5 90 e7 42 11 49 a2 9d 94 b0 b6
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): 41 4d 54 85 23 5e 1a 68 87 93 bd 74
{client} extract secret "early" (same as server early secret)
{client} derive secret for handshake "tls13 derived":
PRK (32 octets): 33 ad 0a 1c 60 7e c0 3b 09 e6 cd 98 93 68 0c e2 10 ad f3 00 aa 1f 26 60 e1 b2 2e 10 f1 70 f9 2a
hash (32 octets): e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
info (49 octets): 00 20 0d 74 6c 73 31 33 20 64 65 72 69 76 65 64 20 e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
expanded (32 octets): 6f 26 15 a1 08 c7 02 c5 67 8f 54 fc 9d ba b6 97 16 c0 76 18 9c 48 25 0c eb ea c3 57 6c 36 11 ba
{client} extract secret "handshake" (same as server handshake secret)
{client} derive secret "tls13 c hs traffic" (same as server)
{client} derive secret "tls13 s hs traffic" (same as server)
{client} derive secret for master "tls13 derived" (same as server)
{client} extract secret "master" (same as server master secret)
{client} derive read traffic keys for handshake data (same as server handshake data write traffic keys)
{client} calculate finished "tls13 finished" (same as server) {client} derive secret "tls13 c ap traffic" (same as server)
{client} derive secret "tls13 s ap traffic" (same as server)
{client} derive secret "tls13 exp master" (same as server)
{client} derive write traffic keys for handshake data (same as server handshake data read traffic keys)
{client} derive read traffic keys for application data (same as server application data write traffic keys)
{client} calculate finished "tls13 finished":
PRK (32 octets): 15 8a a7 ab 88 55 07 35 82 b4 1d 67 4b 40 55 ca bc c5 34 72 8f 65 93 14 86 1b 4e 08 e2 01 15 66
hash (0 octets): (empty)
info (18 octets): 00 20 0e 74 6c 73 31 33 20 66 69 6e 69 73 68 65 64 00
expanded (32 octets): 81 be 41 31 fb b9 b6 f4 47 14 50 84 6f 74 fd 1e 68 c5 22 4b a7 c2 a8 67 7f 5c 53 ad 22 6f dc 13
finished (32 octets): 23 f5 2f db 07 09 a5 5b d7 f7 9b 99 1f 25 48 40 87 bc fd 4d 43 80 b1 23 26 a5 2a 28 b2 e3 68 e1
{client} construct a Finished handshake message:
Finished (36 octets): 14 00 00 20 23 f5 2f db 07 09 a5 5b d7 f7 9b 99 1f 25 48 40 87 bc fd 4d 43 80 b1 23 26 a5 2a 28 b2 e3 68 e1
{client} send handshake record:
payload (36 octets): 14 00 00 20 23 f5 2f db 07 09 a5 5b d7 f7 9b 99 1f 25 48 40 87 bc fd 4d 43 80 b1 23 26 a5 2a 28 b2 e3 68 e1
complete record (58 octets): 17 03 03 00 35 d7 4f 19 23 c6 62 fd 34 13 7c 6f 50 2f 3d d2 b9 3d 95 1d 1b 3b c9 7e 42 af e2 3c 31 ab ea 92 fe 91 b4 74 99 9e 85 e3 b7 91 ce 25 2f e8 c3 e9 f9 39 a4 12 0c b2
{client} derive write traffic keys for application data:
PRK (32 octets): 75 ec f4 b9 72 52 5a a0 dc d0 57 c9 94 4d 4c d5 d8 26 71 d8 84 31 41 d7 dc 2a 4f f1 5a 21 dc 51
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): a7 eb 2a 05 25 eb 43 31 d5 8f cb f9 f7 ca 2e 9c
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): 86 e8 be 22 7c 1b d2 b3 e3 9c b4 44
{client} derive secret "tls13 res master":
PRK (32 octets): 11 31 54 5d 0b af 79 dd ce 9b 87 f0 69 45 78 1a 57 dd 18 ef 37 8d cd 20 60 f8 f9 a5 69 02 7e d8
hash (32 octets): 0e 8b 34 91 58 b8 55 fd cd 0c 11 db bc 4e 83 e4 3c aa 6e 48 3c 6c 65 df 53 15 18 88 e5 01 65 f4
info (52 octets): 00 20 10 74 6c 73 31 33 20 72 65 73 20 6d 61 73 74 65 72 20 0e 8b 34 91 58 b8 55 fd cd 0c 11 db bc 4e 83 e4 3c aa 6e 48 3c 6c 65 df 53 15 18 88 e5 01 65 f4
expanded (32 octets): 09 17 0c 6d 47 27 21 56 6f 9c f9 9b 08 69 9d af f5 61 ec 8f b2 2d 5a 32 c3 f9 4c e0 09 b6 99 75
{server} calculate finished "tls13 finished" (same as client)
{server} derive read traffic keys for application data (same as client application data write traffic keys)
{server} derive secret "tls13 res master" (same as client)
{client} send alert record:
payload (2 octets): 01 00
complete record (24 octets): 17 03 03 00 13 2e a6 cd f7 49 19 60 23 e2 b3 a4 94 91 69 55 36 42 60 47
{server} send alert record:
<lavender>the traffic keys are all locked in now 🔐💖 the client finished its half and the alert records are getting sent 🌸 we're so close to the end bestie 🦋</lavender>
# 5. HelloRetryRequest (continued) 🦋
Okay so the last bit of the HelloRetryRequest record is just two little payload bytes plus the full 24-octet record that wraps them. Lowkey my favourite kind of tiny detail 🥺
payload (2 octets): 01 00
complete record (24 octets): 17 03 03 00 13 51 9f c5 07 5c b0 88 43 49 75 9f f9 ef 6f 01 1b b4 c6 f2
# 6. Client Authentication 🎀
Okay, this is the part where the server says "show me your ID, bestie" 🪪 It requests client authentication. The client shows up with an RSA certificate, and the server has an Elliptic Curve Digital Signature Algorithm (ECDSA) certificate with a P-256 key. Iconic pairing, no cap. Also, the private keys for these certificates are NOT shown in this example, so don't go looking for them 🙈
Now the client makes a fresh ephemeral x25519 key pair 🌸
{client} create an ephemeral x25519 key pair:
private key (32 octets): c0 40 b2 bb 8f 3a dd d2 0f d4 05 8c 54 70 03 a3 c6 f9 c1 cd 91 5d 5e 53 5c 87 d8 d1 91 aa f0 71
public key (32 octets): 08 9c c2 67 1f 73 8d 9a 67 1e 5b 2e 46 49 81 d0 5b 76 e3 61 aa 22 ae a9 1f 1d 49 ca 10 a7 a3 62
Next up, the client builds its ClientHello handshake message. It's giving main character energy 👑
{client} construct a ClientHello handshake message:
ClientHello (192 octets): 01 00 00 bc 03 03 6a 47 22 36 32 8b 83 af 40 38 6d 3a 3e 1f 1c e6 24 fa 4e d8 9a b8 65 a4 ff 0f 41 44 ce 3a e2 33 00 00 06 13 01 13 03 13 02 01 00 00 8d 00 00 00 0b 00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 14 00 12 00 1d 00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 33 00 26 00 24 00 1d 00 20 08 9c c2 67 1f 73 8d 9a 67 1e 5b 2e 46 49 81 d0 5b 76 e3 61 aa 22 ae a9 1f 1d 49 ca 10 a7 a3 62 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02 02 02 00 2d 00 02 01 01 00 1c 00 02 40 01
Then the client sends that handshake record off into the world 🚀
{client} send handshake record:
payload (192 octets): 01 00 00 bc 03 03 6a 47 22 36 32 8b 83 af 40 38 6d 3a 3e 1f 1c e6 24 fa 4e d8 9a b8 65 a4 ff 0f 41 44 ce 3a e2 33 00 00 06 13 01 13 03 13 02 01 00 00 8d 00 00 00 0b 00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 14 00 12 00 1d 00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 33 00 26 00 24 00 1d 00 20 08 9c c2 67 1f 73 8d 9a 67 1e 5b 2e 46 49 81 d0 5b 76 e3 61 aa 22 ae a9 1f 1d 49 ca 10 a7 a3 62 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02 02 02 00 2d 00 02 01 01 00 1c 00 02 40 01
complete record (197 octets): 16 03 01 00 c0 01 00 00 bc 03 03 6a 47 22 36 32 8b 83 af 40 38 6d 3a 3e 1f 1c e6 24 fa 4e d8 9a b8 65 a4 ff 0f 41 44 ce 3a e2 33 00 00 06 13 01 13 03 13 02 01 00 00 8d 00 00 00 0b 00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 14 00 12 00 1d 00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 33 00 26 00 24 00 1d 00 20 08 9c c2 67 1f 73 8d 9a 67 1e 5b 2e 46 49 81 d0 5b 76 e3 61 aa 22 ae a9 1f 1d 49 ca 10 a7 a3 62 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02 02 02 00 2d 00 02 01 01 00 1c 00 02 40 01
Now it's the server's turn to glow up ✨ First up, the server pulls the early secret out of the all-zero input. The salt and IKM are both zeroes here, so it's a very chill starting point 🧊
{server} extract secret "early":
salt: 0 (all zero octets)
IKM (32 octets): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
secret (32 octets): 33 ad 0a 1c 60 7e c0 3b 09 e6 cd 98 93 68 0c e2 10 ad f3 00 aa 1f 26 60 e1 b2 2e 10 f1 70 f9 2a
Then the server makes its own ephemeral x25519 key pair 💅
{server} create an ephemeral x25519 key pair:
private key (32 octets): 73 82 a5 ad 1c dd 20 56 ae 18 cc 70 8b d0 07 d9 81 30 db e2 cd 4d 9e ad 9b 96 95 2b ec bb 08 88
public key (32 octets): 6c 2e 50 e8 65 91 9a 6b 5a 12 df af 91 8f 92 b4 42 56 7b 0f 89 bc 54 47 8c 69 21 36 66 58 f0 62
Next, the server builds its ServerHello handshake message 🫶
{server} construct a ServerHello handshake message:
ServerHello (90 octets): 02 00 00 56 03 03 3b 50 fd f1 c3 d5 72 e4 0e 68 95 3e 7f ff 4e 27 58 45 9c 59 af a0 58 2c 0e a0 32 87 42 55 fe 6e 00 13 01 00 00 2e 00 33 00 24 00 1d 00 20 6c 2e 50 e8 65 91 9a 6b 5a 12 df af 91 8f 92 b4 42 56 7b 0f 89 bc 54 47 8c 69 21 36 66 58 f0 62 00 2b 00 02 03 04
The server now derives a handshake-stage secret labelled "tls13 derived" 🔐
{server} derive secret for handshake "tls13 derived":
PRK (32 octets): 33 ad 0a 1c 60 7e c0 3b 09 e6 cd 98 93 68 0c e2 10 ad f3 00 aa 1f 26 60 e1 b2 2e 10 f1 70 f9 2a
hash (32 octets): e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
info (49 octets): 00 20 0d 74 6c 73 31 33 20 64 65 72 69 76 65 64 20 e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
expanded (32 octets): 6f 26 15 a1 08 c7 02 c5 67 8f 54 fc 9d ba b6 97 16 c0 76 18 9c 48 25 0c eb ea c3 57 6c 36 11 ba
Now the server extracts the "handshake" secret, using the expanded value from above as the salt 🧁
{server} extract secret "handshake":
salt (32 octets): 6f 26 15 a1 08 c7 02 c5 67 8f 54 fc 9d ba b6 97 16 c0 76 18 9c 48 25 0c eb ea c3 57 6c 36 11 ba
IKM (32 octets): 7d c1 14 f6 47 5d fa 79 77 be 73 6e f7 cb eb c4 8c 70 32 9e 8e 9a 74 b4 d7 03 3c 43 f9 59 7d 4f
secret (32 octets): d9 95 24 36 74 fb 64 00 d7 d3 7b c0 e9 86 1b db d9 ed 09 56 01 dc f2 99 48 74 f2 80 3d e2 2e 39
Next, the server derives the "tls13 c hs traffic" secret 🦋
{server} derive secret "tls13 c hs traffic":
PRK (32 octets): d9 95 24 36 74 fb 64 00 d7 d3 7b c0 e9 86 1b db d9 ed 09 56 01 dc f2 99 48 74 f2 80 3d e2 2e 39
hash (32 octets): 88 eb c0 42 bd 0d 5a 64 3b 22 fc a7 a4 7d ef d4 00 7d fe 18 49 49 a6 26 1c 59 6c 4e 00 2a 74 a2
info (54 octets): 00 20 12 74 6c 73 31 33 20 63 20 68 73 20 74 72 61 66 66 69 63 20 88 eb c0 42 bd 0d 5a 64 3b 22 fc a7 a4 7d ef d4 00 7d fe 18 49 49 a6 26 1c 59 6c 4e 00 2a 74 a2
expanded (32 octets): ce c7 a3 0c 68 72 07 0f 22 a7 ee b0 65 76 8d b6 7c 45 e2 95 33 db 87 99 08 ce 6d c6 6f 59 11 de
Then the server derives the "tls13 s hs traffic" secret, the sibling of that one 👯
{server} derive secret "tls13 s hs traffic":
PRK (32 octets): d9 95 24 36 74 fb 64 00 d7 d3 7b c0 e9 86 1b db d9 ed 09 56 01 dc f2 99 48 74 f2 80 3d e2 2e 39
hash (32 octets): 88 eb c0 42 bd 0d 5a 64 3b 22 fc a7 a4 7d ef d4 00 7d fe 18 49 49 a6 26 1c 59 6c 4e 00 2a 74 a2
info (54 octets): 00 20 12 74 6c 73 31 33 20 73 20 68 73 20 74 72 61 66 66 69 63 20 88 eb c0 42 bd 0d 5a 64 3b 22 fc a7 a4 7d ef d4 00 7d fe 18 49 49 a6 26 1c 59 6c 4e 00 2a 74 a2
expanded (32 octets): 8b 02 d3 c0 04 42 a2 72 2c 40 98 eb e8 67 5b 23 e8 01 51 0f 0d 7e d7 78 d8 eb 0b 8f 42 a1 9a 5e
Now the server derives the "tls13 derived" secret again, this time for the master stage 🌈
{server} derive secret for master "tls13 derived":
PRK (32 octets): d9 95 24 36 74 fb 64 00 d7 d3 7b c0 e9 86 1b db d9 ed 09 56 01 dc f2 99 48 74 f2 80 3d e2 2e 39
hash (32 octets): e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
info (49 octets): 00 20 0d 74 6c 73 31 33 20 64 65 72 69 76 65 64 20 e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
expanded (32 octets): 74 57 55 26 b0 7c 81 a9 c1 b1 7e 6b 34 e0 e6 d0 84 74 7a 61 f3 96 f5 97 eb b9 2c 07 36 ec 60 e8
The server extracts the "master" secret, with the zero IKM 🌟
{server} extract secret "master":
salt (32 octets): 74 57 55 26 b0 7c 81 a9 c1 b1 7e 6b 34 e0 e6 d0 84 74 7a 61 f3 96 f5 97 eb b9 2c 07 36 ec 60 e8
IKM (32 octets): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
secret (32 octets): 57 c1 5d 7b 9d 44 1b 3d 40 a9 c6 ea 8a 3d 73 0e 07 b3 a1 ea 7a 33 39 ed 70 70 b9 a7 4a 3f 4f 28
Time to send the ServerHello record 📨
{server} send handshake record:
payload (90 octets): 02 00 00 56 03 03 3b 50 fd f1 c3 d5 72 e4 0e 68 95 3e 7f ff 4e 27 58 45 9c 59 af a0 58 2c 0e a0 32 87 42 55 fe 6e 00 13 01 00 00 2e 00 33 00 24 00 1d 00 20 6c 2e 50 e8 65 91 9a 6b 5a 12 df af 91 8f 92 b4 42 56 7b 0f 89 bc 54 47 8c 69 21 36 66 58 f0 62 00 2b 00 02 03 04
complete record (95 octets): 16 03 03 00 5a 02 00 00 56 03 03 3b 50 fd f1 c3 d5 72 e4 0e 68 95 3e 7f ff 4e 27 58 45 9c 59 af a0 58 2c 0e a0 32 87 42 55 fe 6e 00 13 01 00 00 2e 00 33 00 24 00 1d 00 20 6c 2e 50 e8 65 91 9a 6b 5a 12 df af 91 8f 92 b4 42 56 7b 0f 89 bc 54 47 8c 69 21 36 66 58 f0 62 00 2b 00 02 03 04
okay so the server's payload is 517 octets and I'm literally obsessed 🥹✨
payload (517 octets): 08 00 00 24 00 22 00 0a 00 14 00 12 00 1d 00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 1c 00 02 40 01 00 00 00 00 0d 00 00 27 00 00 24 00 0d 00 20 00 1e 04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02 02 02 0b 00 01 3b 00 00 01 37 00 01 32 30 82 01 2e 30 81 d5 a0 03 02 01 02 02 01 07 30 0a 06 08 2a 86 48 ce 3d 04 03 02 30 13 31 11 30 0f 06 03 55 04 03 13 08 65 63 64 73 61 32 35 36 30 1e 17 0d 31 36 30 37 33 30 30 31 32 34 30 30 5a 17 0d 32 36 30 37 33 30 30 31 32 34 30 30 5a 30 13 31 11 30 0f 06 03 55 04 03 13 08 65 63 64 73 61 32 35 36 30 59 30 13 06 07 2a 86 48 ce 3d 02 01 06 08 2a 86 48 ce 3d 03 01 07 03 42 00 04 08 d5 30 16 15 75 f4 cf e7 f1 54 ee 34 48 18 00 86 00 1e 88 43 1a 79 ee 62 ee 6e 2f 83 ef 38 ba 61 e9 fb 37 f3 4e 00 7a 7d f4 d2 f5 b5 6d 1f 04 ec e4 5d 62 1f 46 84 06 f5 c3 a1 51 58 94 8d d0 a3 1a 30 18 30 09 06 03 55 1d 13 04 02 30 00 30 0b 06 03 55 1d 0f 04 04 03 02 07 80 30 0a 06 08 2a 86 48 ce 3d 04 03 02 03 48 00 30 45 02 21 00 df 30 fd 45 07 f5 ed d2 2c 1a 6f f8 6d b4 79 ca 69 3f ee ca 3b 71 b3 f9 ef 55 6b 29 37 c0 59 4d 02 20 62 e2 a4 72 50 d3 20 fe a8 3c 7e 2d cb 5b 76 a5 0e 02 00 c0 9a db d1 3f ee 94 6e 51 3e 01 1d 11 00 00 0f 00 00 4b 04 03 00 47 30 45 02 21 00 d7 a4 d3 4b d5 4f 55 fe e1 a8 96 25 67 8c 3d d5 e5 f6 0d ac 73 ec 94 0c 5c 7b 93 04 a0 20 84 a9 02 20 28 9f 59 5e d4 88 b9 ac 68 9a 3d 19 2b 1a 8b b3 8f 34 af 78 74 c0 59 c9 80 6a 1f 38 26 93 53 e8 14 00 00 20 93 b7 0c df 47 81 98 5b 96 34 5c aa c7 01 b4 e7 50 d3 04 2d f1 a6 89 d8 fa ca 81 22 51 11 3c 11
next up is the complete record, which is 539 octets and honestly so put together 💅🎀
complete record (539 octets): 17 03 03 02 16 6d 0a 7a c0 79 b3 2a 94 aa 68 c4 e2 89 3e 8b d0 d3 c1 85 f5 49 c2 36 fb bc e3 d6 47 f0 8f 3c 94 a2 bf 42 4d 87 08 88 36 05 ad 89 55 f9 77 18 b0 21 3d ea d1 3d fb 23 eb b8 38 1d a5 82 75 66 12 bc b5 a5 d4 08 47 71 9f be 9f 17 9b fa e6 56 f3 ec fd 59 a4 c0 d3 51 32 ce 41 8a 7e 46 f6 b6 a6 06 22 f8 a6 c0 6b 28 d8 33 60 16 35 63 be 9c 37 f9 7e b9 02 32 69 24 a7 2b 3e d8 c8 38 12 77 d1 58 1c ab 9c 37 15 ac 24 01 39 84 67 ad 7e bf ab 3d 0c 34 19 e7 50 10 4f 7d 62 c5 02 79 01 f2 e4 cd 4c a5 b8 07 1e b0 3d 3c 73 2d 83 21 50 66 df c4 d2 91 d4 c1 ff 3b 8d 7e 42 98 f6 77 d4 d5 1d ea 11 68 d8 f1 6c b2 7b a4 02 66 31 3a 1f ed f9 e2 3c c7 7f 76 54 50 f9 e9 6f 05 d0 8f 3d a2 45 b1 4d 49 46 f0 7e c8 1e ed 6d 56 f2 6b d5 74 f0 b7 f7 c7 04 70 37 c1 6f ce 3b 23 75 4e 66 2f ad 73 e2 b7 21 3f 6a f2 96 76 9c 99 a1 d3 8e 62 32 e0 ec 8d c4 f8 4d 6a a6 f7 de 38 87 be 00 57 86 2f 90 18 e0 ab 39 67 05 aa 40 90 ab 5f 2d ff 63 25 a5 57 e7 32 0d 4e ff d4 6b b4 f9 97 d1 63 20 7c ce 66 65 29 4a a4 46 55 41 e3 fe 37 ee 73 50 65 9e a5 50 d6 dc b6 af 3c 51 88 52 c7 a1 4c 3c c1 5b c3 2b 32 73 bd f1 75 1d a1 84 20 31 35 b1 17 d3 00 20 4f b1 2d 58 ca 9a c3 4b 68 ec a2 70 30 83 2f 7a 4b 46 d2 a5 57 57 f6 3f e8 f6 e8 5a c4 74 69 e6 19 8d a8 8a 64 58 6b f2 3c 69 59 0d e8 22 26 3b e7 5f d8 36 84 72 40 c4 8f 8c 14 5c d6 bd 69 89 62 e7 ed c2 34 eb e5 92 31 35 1e ef 8d 76 52 cf 3b 08 ab 3a f6 e5 ec 74 c5 8a 8d a3 4b 39 f9 b0 d6 c4 27 9a 9a 1f 82 07 17 29 e7 05 9d d7 f7 b9 5b 94 33 c4 68 4c e1 89 1a 6d 33 43 2d 52 ed db 0b 8c ee 91 81 d4 03 ec cc 12 99 1f 1a d4 aa 62 c3 60 49 71 3a 7b b1 35 fd da 66 61 a0 5a 93 f8 c1 6f
now the server derives its application traffic secrets 🦋 this is where the keys get their glow-up
{server} derive secret "tls13 c ap traffic":
PRK (32 octets): 57 c1 5d 7b 9d 44 1b 3d 40 a9 c6 ea 8a 3d 73 0e 07 b3 a1 ea 7a 33 39 ed 70 70 b9 a7 4a 3f 4f 28
hash (32 octets): 51 77 a2 9a f5 a1 7f 9b 49 33 e4 31 85 1d 12 83 45 36 6c 17 20 d3 8f 8f 04 65 ee ea e6 74 03 72
info (54 octets): 00 20 12 74 6c 73 31 33 20 63 20 61 70 20 74 72 61 66 66 69 63 20 51 77 a2 9a f5 a1 7f 9b 49 33 e4 31 85 1d 12 83 45 36 6c 17 20 d3 8f 8f 04 65 ee ea e6 74 03 72
expanded (32 octets): 73 c2 e8 90 fa 8d 06 72 58 d6 d5 0f a9 2f e4 56 b0 98 cf 00 d9 72 7e ed 91 e8 89 2e f4 e6 f8 60
{server} derive secret "tls13 s ap traffic":
PRK (32 octets): 57 c1 5d 7b 9d 44 1b 3d 40 a9 c6 ea 8a 3d 73 0e 07 b3 a1 ea 7a 33 39 ed 70 70 b9 a7 4a 3f 4f 28
hash (32 octets): 51 77 a2 9a f5 a1 7f 9b 49 33 e4 31 85 1d 12 83 45 36 6c 17 20 d3 8f 8f 04 65 ee ea e6 74 03 72
info (54 octets): 00 20 12 74 6c 73 31 33 20 73 20 61 70 20 74 72 61 66 66 69 63 20 51 77 a2 9a f5 a1 7f 9b 49 33 e4 31 85 1d 12 83 45 36 6c 17 20 d3 8f 8f 04 65 ee ea e6 74 03 72
expanded (32 octets): c4 9a 91 fa f5 7f 8c 54 5d 50 48 a0 15 bf 84 9f f6 39 42 e4 a7 ed cd 31 9f 8b 43 8a 97 c5 2e 21
{server} derive secret "tls13 exp master":
PRK (32 octets): 57 c1 5d 7b 9d 44 1b 3d 40 a9 c6 ea 8a 3d 73 0e 07 b3 a1 ea 7a 33 39 ed 70 70 b9 a7 4a 3f 4f 28
hash (32 octets): 51 77 a2 9a f5 a1 7f 9b 49 33 e4 31 85 1d 12 83 45 36 6c 17 20 d3 8f 8f 04 65 ee ea e6 74 03 72
info (52 octets): 00 20 10 74 6c 73 31 33 20 65 78 70 20 6d 61 73 74 65 72 20 51 77 a2 9a f5 a1 7f 9b 49 33 e4 31 85 1d 12 83 45 36 6c 17 20 d3 8f 8f 04 65 ee ea e6 74 03 72
expanded (32 octets): 05 2e 39 79 5e 5f 2b e6 e4 e0 97 4c fd d8 6c 6a 7a fe 3e 57 e5 58 98 10 a3 cc cf 64 29 58 be b2
okay the server's write keys for application data, bestie this is the good stuff 🔑🔥
{server} derive write traffic keys for application data:
PRK (32 octets): c4 9a 91 fa f5 7f 8c 54 5d 50 48 a0 15 bf 84 9f f6 39 42 e4 a7 ed cd 31 9f 8b 43 8a 97 c5 2e 21
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): 88 b3 12 3d de ca df 8c 1b a2 98 e2 c1 81 76 b0
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): 4e 09 78 51 3f 9d e8 32 7c 08 e4 f3
{server} derive read traffic keys for handshake data:
PRK (32 octets): ce c7 a3 0c 68 72 07 0f 22 a7 ee b0 65 76 8d b6 7c 45 e2 95 33 db 87 99 08 ce 6d c6 6f 59 11 de
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): 91 69 48 f7 28 d9 82 3f a4 1a 00 4d 08 3f 21 7f
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): 64 15 3d 79 ba c9 ea 10 ca 5a 0a 88
now it's the client's turn 💜 it does the same dance but mirrors the server, so lots of "same as server" energy
{client} extract secret "early" (same as server early secret) {client} derive secret for handshake "tls13 derived":
PRK (32 octets): 33 ad 0a 1c 60 7e c0 3b 09 e6 cd 98 93 68 0c e2 10 ad f3 00 aa 1f 26 60 e1 b2 2e 10 f1 70 f9 2a
hash (32 octets): e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
info (49 octets): 00 20 0d 74 6c 73 31 33 20 64 65 72 69 76 65 64 20 e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
expanded (32 octets): 6f 26 15 a1 08 c7 02 c5 67 8f 54 fc 9d ba b6 97 16 c0 76 18 9c 48 25 0c eb ea c3 57 6c 36 11 ba
{client} extract secret "handshake" (same as server handshake secret)
{client} derive secret "tls13 c hs traffic" (same as server)
{client} derive secret "tls13 s hs traffic" (same as server)
{client} derive secret for master "tls13 derived" (same as server)
{client} extract secret "master" (same as server master secret)
{client} derive read traffic keys for handshake data (same as server handshake data write traffic keys)
{client} calculate finished "tls13 finished" (same as server)
{client} derive secret "tls13 c ap traffic" (same as server)
{client} derive secret "tls13 s ap traffic" (same as server)
{client} derive secret "tls13 exp master" (same as server)
{client} derive write traffic keys for handshake data (same as server handshake data read traffic keys)
{client} derive read traffic keys for application data (same as server application data write traffic keys)
next the client constructs its Certificate message, which is 451 octets of pure main character energy 👑🌸
{client} construct a Certificate handshake message:
Certificate (451 octets): 0b 00 01 bf 00 00 01 bb 00 01 b6 30 82 01 b2 30 82 01 1b a0 03 02 01 02 02 01 01 30 0d 06 09 2a 86 48 86 f7 0d 01 01 0b 05 00 30 11 31 0f 30 0d 06 03 55 04 03 13 06 63 6c 69 65 6e 74 30 1e 17 0d 31 36 30 37 33 30 30 31 32 33 35 39 5a 17 0d 32 36 30 37 33 30 30 31 32 33 35 39 5a 30 11 31 0f 30 0d 06 03 55 04 03 13 06 63 6c 69 65 6e 74 30 81 9f 30 0d 06 09 2a 86 48 86 f7 0d 01 01 01 05 00 03 81 8d 00 30 81 89 02 81 81 00 c3 81 75 e0 04 a6 8d 09 3f 82 3b 9c 37 9d 20 1f bc 0b b7 a1 c7 91 90 5e 3f bf 76 84 7e 44 e7 51 eb bc d3 60 bd 94 5c 81 e5 22 2b cc 88 46 d3 a8 a0 f9 3e 9b f5 be ba bd 92 ed f1 de 1f f1 90 21 70 3e 7a b6 c0 90 15 13 f9 7e 39 b1 11 f0 9c 93 48 97 1c 7b 21 19 84 a7 54 cd 45 fe 09 5a f0 ea 42 36 82 9b cc f7 a7 fe 9b 28 88 e7 8a b4 77 69 0a 5b 9e 1c cb e9 1c 6a 4a 0f 97 a7 e0 28 42 01 02 03 01 00 01 a3 1a 30 18 30 09 06 03 55 1d 13 04 02 30 00 30 0b 06 03 55 1d 0f 04 04 03 02 07 80 30 0d 06 09 2a 86 48 86 f7 0d 01 01 0b 05 00 03 81 81 00 1a 7a 5a 01 85 32 b0 22 af 07 67 d4 86 16 0c ff 2d 16 7a 19 15 d2 38 35 b5 45 94 91 6d c6 80 be 5d 2e 62 60 76 c5 d5 27 22 eb cc 77 5d 7d 99 f9 80 be 2f c9 4d 34 ac f6 cc 00 ba 90 cb cf b0 60 8a a1 e7 e3 97 1e f0 c0 7a 41 d4 7a d8 34 5d 1f 81 fe 41 8a 1c f4 10 54 42 9f d2 17 bd 77 7d c1 cf 08 f0 5d f9 07 99 c6 59 36 1e 0f 1a 8e e4 ac 0f 78 97 42 0b db c8 23 da 80 a2 f2 ba 23 08 1c 00 00
then the CertificateVerify, which is 136 octets and very much a flex 💅
{client} construct a CertificateVerify handshake message:
CertificateVerify (136 octets): 0f 00 00 84 08 04 00 80 18 6b 22 23 b5 03 a7 59 c3 5d ba 0e 97 21 b4 b5 79 13 8d 5f 0f 5e 6e c7 fe aa f2 7f 3a d7 f3 86 c2 c7 bd 7c b2 be 52 fb f5 ed 83 93 f4 06 ee 79 36 96 92 ec 7a c6 95 65 1d 85 82 19 e6 72 a8 eb 7b 2a 67 7b 64 0b 46 ab 63 0e dc 5f 3f 2f 82 72 b9 c0 d9 06 f8 1f 84 dd c5 b8 c7 bc f9 55 c7 8a 3c f9 9e 50 16 f7 3e 04 eb 7d fc b2 88 33 f1 3e 8f 75 ec 2f f3 58 1e 2f 09 8a d4 15 7f d6 d6 ad
and last but not least, the client's Finished. we're almost there bestie 🎀
{client} calculate finished "tls13 finished":
PRK (32 octets): ce c7 a3 0c 68 72 07 0f 22 a7 ee b0 65 76 8d b6 7c 45 e2 95 33 db 87 99 08 ce 6d c6 6f 59 11 de
hash (0 octets): (empty)
info (18 octets): 00 20 0e 74 6c 73 31 33 20 66 69 6e 69 73 68 65 64 00
expanded (32 octets): 4f dd d7 6b bc b8 e3 0c 72 61 b1 db 40 1b b1 36 ed 39 bc e6 a4 81 5a 21 24 47 6e 27 e6 cb cb f6
finished (32 octets): 9a fe 2b a2 f6 3a 09 d2 29 d8 a4 29 e5 b3 7f fd 9f cc 73 bd b5 91 1b 82 42 59 72 aa 28 92 44 0f
{client} construct a Finished handshake message:
Finished (36 octets): 14 00 00 20 9a fe 2b a2 f6 3a 09 d2 29 d8 a4 29 e5 b3 7f fd 9f cc 73 bd b5 91 1b 82 42 59 72 aa 28 92 44 0f
{client} send handshake record:
okay bestie, we're wrapping up the client auth era and it's giving full cinematic finale 🎬✨
payload (623 octets): 0b 00 01 bf 00 00 01 bb 00 01 b6 30 82 01 b2 30 82 01 1b a0 03 02 01 02 02 01 01 30 0d 06 09 2a 86 48 86 f7 0d 01 01 0b 05 00 30 11 31 0f 30 0d 06 03 55 04 03 13 06 63 6c 69 65 6e 74 30 1e 17 0d 31 36 30 37 33 30 30 31 32 33 35 39 5a 17 0d 32 36 30 37 33 30 30 31 32 33 35 39 5a 30 11 31 0f 30 0d 06 03 55 04 03 13 06 63 6c 69 65 6e 74 30 81 9f 30 0d 06 09 2a 86 48 86 f7 0d 01 01 01 05 00 03 81 8d 00 30 81 89 02 81 81 00 c3 81 75 e0 04 a6 8d 09 3f 82 3b 9c 37 9d 20 1f bc 0b b7 a1 c7 91 90 5e 3f bf 76 84 7e 44 e7 51 eb bc d3 60 bd 94 5c 81 e5 22 2b cc 88 46 d3 a8 a0 f9 3e 9b f5 be ba bd 92 ed f1 de 1f f1 90 21 70 3e 7a b6 c0 90 15 13 f9 7e 39 b1 11 f0 9c 93 48 97 1c 7b 21 19 84 a7 54 cd 45 fe 09 5a f0 ea 42 36 82 9b cc f7 a7 fe 9b 28 88 e7 8a b4 77 69 0a 5b 9e 1c cb e9 1c 6a 4a 0f 97 a7 e0 28 42 01 02 03 01 00 01 a3 1a 30 18 30 09 06 03 55 1d 13 04 02 30 00 30 0b 06 03 55 1d 0f 04 04 03 02 07 80 30 0d 06 09 2a 86 48 86 f7 0d 01 01 0b 05 00 03 81 81 00 1a 7a 5a 01 85 32 b0 22 af 07 67 d4 86 16 0c ff 2d 16 7a 19 15 d2 38 35 b5 45 94 91 6d c6 80 be 5d 2e 62 60 76 c5 d5 27 22 eb cc 77 5d 7d 99 f9 80 be 2f c9 4d 34 ac f6 cc 00 ba 90 cb cf b0 60 8a a1 e7 e3 97 1e f0 c0 7a 41 d4 7a d8 34 5d 1f 81 fe 41 8a 1c f4 10 54 42 9f d2 17 bd 77 7d c1 cf 08 f0 5d f9 07 99 c6 59 36 1e 0f 1a 8e e4 ac 0f 78 97 42 0b db c8 23 da 80 a2 f2 ba 23 08 1c 00 00 0f 00 00 84 08 04 00 80 18 6b 22 23 b5 03 a7 59 c3 5d ba 0e 97 21 b4 b5 79 13 8d 5f 0f 5e 6e c7 fe aa f2 7f 3a d7 f3 86 c2 c7 bd 7c b2 be 52 fb f5 ed 83 93 f4 06 ee 79 36 96 92 ec 7a c6 95 65 1d 85 82 19 e6 72 a8 eb 7b 2a 67 7b 64 0b 46 ab 63 0e dc 5f 3f 2f 82 72 b9 c0 d9 06 f8 1f 84 dd c5 b8 c7 bc f9 55 c7 8a 3c f9 9e 50 16 f7 3e 04 eb 7d fc b2 88 33 f1 3e 8f 75 ec 2f f3 58 1e 2f 09 8a d4 15 7f d6 d6 ad 14 00 00 20 9a fe 2b a2 f6 3a 09 d2 29 d8 a4 29 e5 b3 7f fd 9f cc 73 bd b5 91 1b 82 42 59 72 aa 28 92 44 0f
complete record (645 octets): 17 03 03 02 80 b4 6a 63 93 4e 67 38 41 ab af 26 74 03 bc 67 7f 6b 6d 2a 1e 2f 12 bb 5f 62 68 3b fe 36 a8 26 73 f0 6d 62 87 dd d6 09 bc f2 f5 fd 32 25 92 3d 24 af 3c 76 68 2c 18 0e e5 71 a1 7c a4 bf be 2f 51 0d c9 a0 e1 fc a5 cf f2 ce e8 7d 11 cb 53 1a 6e f9 0b f5 30 9a 6b 63 bb bc 0b 88 ea 45 10 3a 43 04 09 15 43 85 9f a1 1e c0 32 ed 87 34 44 cd 51 85 ea d5 f6 a7 64 20 f0 f0 28 6a ce f8 02 c8 e4 78 8c 23 27 5f 1b 06 da 60 0f 4a 7d ec d0 bc 59 d7 be f1 0e 64 9a e3 26 90 39 7f c3 d4 ed 6f 30 f8 01 d8 cd 56 9b 71 ad 4f a0 5e a7 cf 2a c2 df a1 50 d2 20 50 5d 40 11 b3 4d 09 d5 38 53 eb a6 1a 10 1e 4f 8d ca 47 d8 17 1a 88 4b 19 25 9a 3d d4 8c 5a c1 41 98 3e dc 77 81 4d 25 e7 f6 6b bb db 90 96 83 92 66 e0 65 61 82 8e cf b2 7e af d4 e9 e8 1a 0b 96 e3 bf a4 2d ae 5a d8 03 59 b9 a6 66 14 02 c3 a2 10 41 77 03 01 06 db d8 f6 5b b6 a0 15 9d 51 2e b1 3a f2 2a 25 9f 31 3b d5 8c 2e 21 fe 05 3d 57 f2 a9 62 b0 a4 ea 68 2c 96 f7 0b 79 b5 60 13 61 92 82 3b 27 be 6a 2f b7 b1 c7 51 cc c0 e3 30 36 15 54 14 85 b7 b3 07 b4 23 33 2c 11 ef a8 0b 72 f9 b8 0a 53 e5 3f 7b b3 8a 3a f4 c5 9f 80 08 ba d0 54 4e 56 14 e6 88 ff 57 bc cd 69 35 f8 1f 44 7f 42 0c 1c 1b f4 05 88 18 e9 0b f5 dc 71 6c ca e4 25 24 85 6d f8 25 0b cd bd 7a f6 5f 82 dd 53 06 1d 02 4f 6d 2f f5 c1 1e 37 92 a9 a7 0e 0e e2 a3 c2 0a 1b 96 8a c3 91 f8 f9 28 31 13 5d 25 24 2a da 2f e2 41 c2 65 3e c9 96 33 9d fa 12 df ae 7a 33 73 df 88 b0 7c a2 7a ef 6d c2 66 a2 5f 13 f7 5c 76 03 9c 1f 46 fd 7a 53 ae 63 99 c9 99 f4 b2 ae e1 8e 48 0d 6d 12 bf ae 22 6b bd c9 2a 6a d5 0b 4d 3b ac 7a bc 3b 36 51 eb 5b e5 6f 33 bf 41 12 7b 3c a8 86 dc 71 4a 50 d1 49 03 57 bd 40 d9 fd 6b e4 22 09 a4 dd b9 eb b2 98 7e 29 f1 20 f0 58 14 61 4d 2c 79 32 00 15 b4 61 fe 73 24 44 76 70 a1 af 5f 65 ca ed 15 b4 74 ab 7f aa 49 50 16 ad f8 08 e5 3b 94 ef 54 af bb 0e 0a 3a 27 32 ab 59 7f 7d 59 23 c7 73 86 aa 51 24 73 1f 8c c7 3e 70 3b 34 1c 17 5a 45 49 39 a7 7a b6 43 13 c1 5c f3 fe 03 c4 f3 38 42 56 49 76
**{client}** derive write traffic keys for application data 🔑:
PRK (32 octets): 73 c2 e8 90 fa 8d 06 72 58 d6 d5 0f a9 2f e4 56 b0 98 cf 00 d9 72 7e ed 91 e8 89 2e f4 e6 f8 60
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): cd c0 9c 80 6a a8 f8 6d fc d5 1e fc 44 a0 c0 39
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): 6e f8 52 e7 8b 46 d9 13 66 8e 53 e7
**{client}** derive secret "tls13 res master" 🧩:
PRK (32 octets): 57 c1 5d 7b 9d 44 1b 3d 40 a9 c6 ea 8a 3d 73 0e 07 b3 a1 ea 7a 33 39 ed 70 70 b9 a7 4a 3f 4f 28
hash (32 octets): 39 1d 00 4b d8 4c 83 1b 15 82 44 44 14 b4 dc 80 64 01 0e cc 76 f3 7f 88 bf eb 1e 88 fe 13 5c 25
info (52 octets): 00 20 10 74 6c 73 31 33 20 72 65 73 20 6d 61 73 74 65 72 20 39 1d 00 4b d8 4c 83 1b 15 82 44 44 14 b4 dc 80 64 01 0e cc 76 f3 7f 88 bf eb 1e 88 fe 13 5c 25
expanded (32 octets): 10 06 dc cb f4 0e b4 eb 97 8b ff 03 92 a9 e4 52 a4 fb ad 58 aa 14 78 4d 5a 24 1c 6b 49 da cc fb
**{server}** calculate finished "tls13 finished" (same as client) ✅
**{server}** derive read traffic keys for application data (same as client application data write traffic keys) 🔐
**{server}** derive secret "tls13 res master" (same as client) 🌸
**{client}** send alert record 🚨:
payload (2 octets): 01 00
complete record (24 octets): 17 03 03 00 13 e4 ad 7d 44 c2 92 45 33 9d 35 59 62 c7 79 b8 9e f4 4c 58
**{server}** send alert record 🚨:
payload (2 octets): 01 00
complete record (24 octets): 17 03 03 00 13 1d ec c5 d6 e6 4b ba 8a 6f 21 b4 fd 07 74 97 da 2a 90 cb
---
# 7. Compatibility Mode 🎀
okay so this one is giving "the client really wants the server to be extra" 💅 this example shows the handshake where the client asks the server to use compatibility mode, which is defined in Appendix D.4 of [TLS13]. ngl this is such a vibe 🦋
**{client}** create an ephemeral x25519 key pair 🌈:
private key (32 octets): de a0 0b 45 69 5d c7 81 f1 9d 34 a6 2c 1a fd 31 ab 43 69 af 1e 85 5a 3b bb 25 8d 84 42 cd e6 d7
public key (32 octets): 8e 72 92 cf 30 56 db b0 d2 5f cb e5 5c 10 7d c9 bb f8 3d d9 70 8f 39 20 3b a3 41 24 9a 7d 9b 63
**{client}** construct a ClientHello handshake message 👋:
ClientHello (224 octets): 01 00 00 dc 03 03 4e 64 0a 3f 2c 27 38 f0 9c 94 18 bd 78 ed cc d7 55 9d 05 31 19 92 76 d4 d9 2a 0e 9e e9 d7 7d 09 20 a8 0c 16 55 81 a8 e0 d0 6c 00 18 d5 4d 3a 06 dd 32 cf d4 05 1e b0 26 fa d3 fd 0b a9 92 69 e6 ef 00 06 13 01 13 03 13 02 01 00 00 8d 00 00 00 0b 00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 14 00 12 00 1d 00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 33 00 26 00 24 00 1d 00 20 8e 72 92 cf 30 56 db b0 d2 5f cb e5 5c 10 7d c9 bb f8 3d d9 70 8f 39 20 3b a3 41 24 9a 7d 9b 63 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02 02 02 00 2d 00 02 01 01 00 1c 00 02 40 01
**{client}** send handshake record 📨:
payload (224 octets): 01 00 00 dc 03 03 4e 64 0a 3f 2c 27 38 f0 9c 94 18 bd 78 ed cc d7 55 9d 05 31 19 92 76 d4 d9 2a 0e 9e e9 d7 7d 09 20 a8 0c 16 55 81 a8 e0 d0 6c 00 18 d5 4d 3a 06 dd 32 cf d4 05 1e b0 26 fa d3 fd 0b a9 92 69 e6 ef 00 06 13 01 13 03 13 02 01 00 00 8d 00 00 00 0b 00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 14 00 12 00 1d 00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 33 00 26 00 24 00 1d 00 20 8e 72 92 cf 30 56 db b0 d2 5f cb e5 5c 10 7d c9 bb f8 3d d9 70 8f 39 20 3b a3 41 24 9a 7d 9b 63 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02 02 02 00 2d 00 02 01 01 00 1c 00 02 40 01
complete record (229 octets): 16 03 01 00 e0 01 00 00 dc 03 03 4e 64 0a 3f 2c 27 38 f0 9c 94 18 bd 78 ed cc d7 55 9d 05 31 19 92 76 d4 d9 2a 0e 9e e9 d7 7d 09 20 a8 0c 16 55 81 a8 e0 d0 6c 00 18 d5 4d 3a 06 dd 32 cf d4 05 1e b0 26 fa d3 fd 0b a9 92 69 e6 ef 00 06 13 01 13 03 13 02 01 00 00 8d 00 00 00 0b 00 09 00 00 06 73 65 72 76 65 72 ff 01 00 01 00 00 0a 00 14 00 12 00 1d 00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 33 00 26 00 24 00 1d 00 20 8e 72 92 cf 30 56 db b0 d2 5f cb e5 5c 10 7d c9 bb f8 3d d9 70 8f 39 20 3b a3 41 24 9a 7d 9b 63 00 2b 00 03 02 03 04 00 0d 00 20 00 1e 04 03 05 03 06 03 02 03 08 04 08 05 08 06 04 01 05 01 06 01 02 01 04 02 05 02 06 02 02 02 00 2d 00 02 01 01 00 1c 00 02 40 01
**{server}** extract secret "early" 🔍:
salt: 0 (all zero octets)
IKM (32 octets): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
secret (32 octets): 33 ad 0a 1c 60 7e c0 3b 09 e6 cd 98 93 68 0c e2 10 ad f3 00 aa 1f 26 60 e1 b2 2e 10 f1 70 f9 2a
**{server}** create an ephemeral x25519 key pair 🌙:
private key (32 octets): 01 7c 38 a3 64 79 21 ca 2d 9e d6 bd 7a e7 13 2b 94 21 1b 13 31 bb 20 8c 8c cd d5 15 56 40 99 95
public key (32 octets): 3e 30 f0 f4 ba 55 1a fd 62 76 83 41 17 5f 52 65 e4 da f0 c8 84 16 17 aa 4f af dd 21 42 32 0c 22
**{server}** construct a ServerHello handshake message 🫶:
ServerHello (122 octets): 02 00 00 76 03 03 e5 dd 59 48 c4 35 f7 a3 8f 0f 01 30 70 8d c3 22 d9 df 09 ab d4 83 81 17 c1 83 a7 bb 6d 99 4f 2c 20 a8 0c 16 55 81 a8 e0 d0 6c 00 18 d5 4d 3a 06 dd 32 cf d4 05 1e b0 26 fa d3 fd 0b a9 92 69 e6 ef 13 01 00 00 2e 00 33 00 24 00 1d 00 20 3e 30 f0 f4 ba 55 1a fd 62 76 83 41 17 5f 52 65 e4 da f0 c8 84 16 17 aa 4f af dd 21 42 32 0c 22 00 2b 00 02 03 04
**{server}** send handshake record 📨:
payload (122 octets): 02 00 00 76 03 03 e5 dd 59 48 c4 35 f7 a3 8f 0f 01 30 70 8d c3 22 d9 df 09 ab d4 83 81 17 c1 83 a7 bb 6d 99 4f 2c 20 a8 0c 16 55 81 a8 e0 d0 6c 00 18 d5 4d 3a 06 dd 32 cf d4 05 1e b0 26 fa d3 fd 0b a9 92 69 e6 ef 13 01 00 00 2e 00 33 00 24 00 1d 00 20 3e 30 f0 f4 ba 55 1a fd 62 76 83 41 17 5f 52 65 e4 da f0 c8 84 16 17 aa 4f af dd 21 42 32 0c 22 00 2b 00 02 03 04
complete record (127 octets): 16 03 03 00 7a 02 00 00 76 03 03 e5 dd 59 48 c4 35 f7 a3 8f 0f 01 30 70 8d c3 22 d9 df 09 ab d4 83 81 17 c1 83 a7 bb 6d 99 4f 2c 20 a8 0c 16 55 81 a8 e0 d0 6c 00 18 d5 4d 3a 06 dd 32 cf d4 05 1e b0 26 fa d3 fd 0b a9 92 69 e6 ef 13 01 00 00 2e 00 33 00 24 00 1d 00 20 3e 30 f0 f4 ba 55 1a fd 62 76 83 41 17 5f 52 65 e4 da f0 c8 84 16 17 aa 4f af dd 21 42 32 0c 22 00 2b 00 02 03 04
**{server}** send change_cipher_spec record 🔁:
payload (1 octets): 01
complete record (6 octets): 14 03 03 00 01 01
**{server}** derive secret for handshake "tls13 derived" 🧁:
PRK (32 octets): 33 ad 0a 1c 60 7e c0 3b 09 e6 cd 98 93 68 0c e2 10 ad f3 00 aa 1f 26 60 e1 b2 2e 10 f1 70 f9 2a
hash (32 octets): e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
info (49 octets): 00 20 0d 74 6c 73 31 33 20 64 65 72 69 76 65 64 20 e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
<lavender>Okay bestie, the key schedule is where it gets spicy 🔐✨ Every value below is derived from the one before it, so we just keep stacking them like a playlist 🎀</lavender>
expanded (32 octets): 6f 26 15 a1 08 c7 02 c5 67 8f 54 fc 9d ba b6 97 16 c0 76 18 9c 48 25 0c eb ea c3 57 6c 36 11 ba
{server} extract secret "handshake":
salt (32 octets): 6f 26 15 a1 08 c7 02 c5 67 8f 54 fc 9d ba b6 97 16 c0 76 18 9c 48 25 0c eb ea c3 57 6c 36 11 ba
IKM (32 octets): ee f7 90 55 90 77 db 5b b6 3b 66 84 e4 16 9f 05 1e 8f b3 4c e5 9b af ce 2f 9c 8e e6 8c c4 eb 79
secret (32 octets): f9 17 61 35 4a 67 e9 b0 7c 6d cc 3a 55 70 7e fa 69 c4 51 9d 80 40 e5 f2 15 12 1e 0d f6 9a fa 4a
{server} derive secret "tls13 c hs traffic":
PRK (32 octets): f9 17 61 35 4a 67 e9 b0 7c 6d cc 3a 55 70 7e fa 69 c4 51 9d 80 40 e5 f2 15 12 1e 0d f6 9a fa 4a
hash (32 octets): 74 5c 55 ba c3 99 31 0b 7b 5a 7c 81 a2 c1 30 b4 d5 6d ff 6f 68 c3 ab 47 78 57 60 1e 01 f1 f8 d1
info (54 octets): 00 20 12 74 6c 73 31 33 20 63 20 68 73 20 74 72 61 66 66 69 63 20 74 5c 55 ba c3 99 31 0b 7b 5a 7c 81 a2 c1 30 b4 d5 6d ff 6f 68 c3 ab 47 78 57 60 1e 01 f1 f8 d1
expanded (32 octets): 2c 3c b2 4a 10 81 ed b5 95 18 ee 68 61 e8 9a 6b 72 b3 80 1a fe 77 13 e4 cb bc 21 c0 79 5b f8 31
{server} derive secret "tls13 s hs traffic":
PRK (32 octets): f9 17 61 35 4a 67 e9 b0 7c 6d cc 3a 55 70 7e fa 69 c4 51 9d 80 40 e5 f2 15 12 1e 0d f6 9a fa 4a
hash (32 octets): 74 5c 55 ba c3 99 31 0b 7b 5a 7c 81 a2 c1 30 b4 d5 6d ff 6f 68 c3 ab 47 78 57 60 1e 01 f1 f8 d1
info (54 octets): 00 20 12 74 6c 73 31 33 20 73 20 68 73 20 74 72 61 66 66 69 63 20 74 5c 55 ba c3 99 31 0b 7b 5a 7c 81 a2 c1 30 b4 d5 6d ff 6f 68 c3 ab 47 78 57 60 1e 01 f1 f8 d1
expanded (32 octets): ca ce 3d 55 5c c1 c5 77 cf 97 0c ff 28 cf 97 8d 6a 98 00 08 54 42 e1 8d 69 5b 50 f3 15 1d 18 c8
{server} derive secret for master "tls13 derived":
PRK (32 octets): f9 17 61 35 4a 67 e9 b0 7c 6d cc 3a 55 70 7e fa 69 c4 51 9d 80 40 e5 f2 15 12 1e 0d f6 9a fa 4a
hash (32 octets): e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
info (49 octets): 00 20 0d 74 6c 73 31 33 20 64 65 72 69 76 65 64 20 e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
expanded (32 octets): 5d a1 2d c4 78 35 ba 73 fd d9 94 b1 4a b7 e6 3c c6 3f 0d 79 16 2f 67 56 e9 a4 67 56 c8 b2 b6 42
{server} extract secret "master":
salt (32 octets): 5d a1 2d c4 78 35 ba 73 fd d9 94 b1 4a b7 e6 3c c6 3f 0d 79 16 2f 67 56 e9 a4 67 56 c8 b2 b6 42
IKM (32 octets): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
secret (32 octets): 62 81 12 da e2 f7 02 48 80 63 e4 2d e6 c8 50 a5 c0 82 0b 90 90 3e 00 ab c3 18 75 da 03 d4 bc 5b
{server} derive write traffic keys for handshake data:
PRK (32 octets): ca ce 3d 55 5c c1 c5 77 cf 97 0c ff 28 cf 97 8d 6a 98 00 08 54 42 e1 8d 69 5b 50 f3 15 1d 18 c8
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): 04 10 91 fd ab 29 f2 c8 ab fb 15 6d c5 fc 8d 54
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): 74 64 d7 91 68 5d e0 59 98 fc ba db
<mint>Now the server gets to show off 🍓 It builds its EncryptedExtensions message first, which is the bit where it tells the client what's up, then the Certificate 🌸</mint>
{server} construct an EncryptedExtensions handshake message:
EncryptedExtensions (40 octets): 08 00 00 24 00 22 00 0a 00 14 00 12 00 1d 00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 1c 00 02 40 01 00 00 00 00
{server} construct a Certificate handshake message:
Certificate (445 octets): 0b 00 01 b9 00 00 01 b5 00 01 b0 30 82 01 ac 30 82 01 15 a0 03 02 01 02 02 01 02 30 0d 06 09 2a 86 48 86 f7 0d 01 01 0b 05 00 30 0e 31 0c 30 0a 06 03 55 04 03 13 03 72 73 61 30 1e 17 0d 31 36 30 37 33 30 30 31 32 33 35 39 5a 17 0d 32 36 30 37 33 30 30 31 32 33 35 39 5a 30 0e 31 0c 30 0a 06 03 55 04 03 13 03 72 73 61 30 81 9f 30 0d 06 09 2a 86 48 86 f7 0d 01 01 01 05 00 03 81 8d 00 30 81 89 02 81 81 00 b4 bb 49 8f 82 79 30 3d 98 08 36 39 9b 36 c6 98 8c 0c 68 de 55 e1 bd b8 26 d3 90 1a 24 61 ea fd 2d e4 9a 91 d0 15 ab bc 9a 95 13 7a ce 6c 1a f1 9e aa 6a f9 8c 7c ed 43 12 09 98 e1 87 a8 0e e0 cc b0 52 4b 1b 01 8c 3e 0b 63 26 4d 44 9a 6d 38 e2 2a 5f da 43 08 46 74 80 30 53 0e f0 46 1c 8c a9 d9 ef bf ae 8e a6 d1 d0 3e 2b d1 93 ef f0 ab 9a 80 02 c4 74 28 a6 d3 5a 8d 88 d7 9f 7f 1e 3f 02 03 01 00 01 a3 1a 30 18 30 09 06 03 55 1d 13 04 02 30 00 30 0b 06 03 55 1d 0f 04 04 03 02 05 a0 30 0d 06 09 2a 86 48 86 f7 0d 01 01 0b 05 00 03 81 81 00 85 aa d2 a0 e5 b9 27 6b 90 8c 65 f7 3a 72 67 17 06 18 a5 4c 5f 8a 7b 33 7d 2d f7 a5 94 36 54 17 f2 ea e8 f8 a5 8c 8f 81 72 f9 31 9c f3 6b 7f d6 c5 5b 80 f2 1a 03 01 51 56 72 60 96 fd 33 5e 5e 67 f2 db f1 02 70 2e 60 8c ca e6 be c1 fc 63 a4 2a 99 be 5c 3e b7 10 7c 3c 54 e9 b9 eb 2b d5 20 3b 1c 3b 84 e0 a8 b2 f7 59 40 9b a3 ea c9 d9 1d 40 2d cc 0c c8 f8 96 12 29 ac 91 87 b4 2b 4d e1 00 00
{server} construct a CertificateVerify handshake message:
CertificateVerify (136 octets): 0f 00 00 84 08 04 00 80 a2 30 1a 68 dd 1c ee e6 93 8f e9 d4 0c 46 b9 20 1b 34 d5 99 52 a3 7e 06 52 3a 39 cf 8b a6 c9 c8 b6 8a e9 44 92 af 78 05 16 ed 7b 73 c8 28 12 e9 9d d3 fa be a4 5e 09 d9 c6 84 87 21 c2 80 8c 61 50 1b 0c 75 e7 fc ab a5 f7 8b ef 68 a2 c2 b6 9b 19 55 8b 3e 40 38 7e ea 93 d2 5c 77 81 c1 cc 00 e9 f5 19 f7 e2 e4 ad b7 3e 76 d6 60 89 00 0a 2d c8 66 c2 ed 30 bb a5 0a 0d 45 7f 19 dc 6e b9 f3
<peach>Time for the Finished message 🧁 This one is basically the server's signature on the whole conversation so far. The hash is computed over the messages, not just vibes 🙈</peach>
{server} calculate finished "tls13 finished":
PRK (32 octets): ca ce 3d 55 5c c1 c5 77 cf 97 0c ff 28 cf 97 8d 6a 98 00 08 54 42 e1 8d 69 5b 50 f3 15 1d 18 c8
hash (0 octets): (empty)
info (18 octets): 00 20 0e 74 6c 73 31 33 20 66 69 6e 69 73 68 65 64 00
expanded (32 octets): 2c 9f 72 f2 7b 81 e7 df 66 8c ac cd 49 37 1f 12 86 d4 11 e1 6c 8c cc 1c 0d 9a ed 72 cb bd c0 80
finished (32 octets): c8 c3 a8 f1 bf f5 27 40 61 f4 bc 3a 7c af fb dc 96 16 09 4c a6 25 ca a6 5f 8e 76 ed 46 db 74 d3
{server} construct a Finished handshake message:
Finished (36 octets): 14 00 00 20 c8 c3 a8 f1 bf f5 27 40 61 f4 bc 3a 7c af fb dc 96 16 09 4c a6 25 ca a6 5f 8e 76 ed 46 db 74 d3
{server} send handshake record:
payload (657 octets): 08 00 00 24 00 22 00 0a 00 14 00 12 00 1d 00 17 00 18 00 19 01 00 01 01 01 02 01 03 01 04 00 1c 00 02 40 01 00 00 00 00 0b 00 01 b9 00 00 01 b5 00 01 b0 30 82 01 ac 30 82 01 15 a0 03 02 01 02 02 01 02 30 0d 06 09 2a 86 48 86 f7 0d 01 01 0b 05 00 30 0e 31 0c 30 0a 06 03 55 04 03 13 03 72 73 61 30 1e 17 0d 31 36 30 37 33 30 30 31 32 33 35 39 5a 17 0d 32 36 30 37 33 30 30 31 32 33 35 39 5a 30 0e 31 0c 30 0a 06 03 55 04 03 13 03 72 73 61 30 81 9f 30 0d 06 09 2a 86 48 86 f7 0d 01 01 01 05 00 03 81 8d 00 30 81 89 02 81 81 00 b4 bb 49 8f 82 79 30 3d 98 08 36 39 9b 36 c6 98 8c 0c 68 de 55 e1 bd b8 26 d3 90 1a 24 61 ea fd 2d e4 9a 91 d0 15 ab bc 9a 95 13 7a ce 6c 1a f1 9e aa 6a f9 8c 7c ed 43 12 09 98 e1 87 a8 0e e0 cc b0 52 4b 1b 01 8c 3e 0b 63 26 4d 44 9a 6d 38 e2 2a 5f da 43 08 46 74 80 30 53 0e f0 46 1c 8c a9 d9 ef bf ae 8e a6 d1 d0 3e 2b d1 93 ef f0 ab 9a 80 02 c4 74 28 a6 d3 5a 8d 88 d7 9f 7f 1e 3f 02 03 01 00 01 a3 1a 30 18 30 09 06 03 55 1d 13 04 02 30 00 30 0b 06 03 55 1d 0f 04 04 03 02 05 a0 30 0d 06 09 2a 86 48 86 f7 0d 01 01 0b 05 00 03 81 81 00 85 aa d2 a0 e5 b9 27 6b 90 8c 65 f7 3a 72 67 17 06 18 a5 4c 5f 8a 7b 33 7d 2d f7 a5 94 36 54 17 f2 ea e8 f8 a5 8c 8f 81 72 f9 31 9c f3 6b 7f d6 c5 5b 80 f2 1a 03 01 51 56 72 60 96 fd 33 5e 5e 67 f2 db f1 02 70 2e 60 8c ca e6 be c1 fc 63 a4 2a 99 be 5c 3e b7 10 7c 3c 54 e9 b9 eb 2b d5 20 3b 1c 3b 84 e0 a8 b2 f7 59 40 9b a3 ea c9 d9 1d 40 2d cc 0c c8 f8 96 12 29 ac 91 87 b4 2b 4d e1 00 00 0f 00 00 84 08 04 00 80 a2 30 1a 68 dd 1c ee e6 93 8f e9 d4 0c 46 b9 20 1b 34 d5 99 52 a3 7e 06 52 3a 39 cf 8b a6 c9 c8 b6 8a e9 44 92 af 78 05 16 ed 7b 73 c8 28 12 e9 9d d3 fa be a4 5e 09 d9 c6 84 87 21 c2 80 8c 61 50 1b 0c 75 e7 fc ab a5 f7 8b ef 68 a2 c2 b6 9b 19 55 8b 3e 40 38 7e ea 93 d2 5c 77 81 c1 cc 00 e9 f5 19 f7 e2 e4 ad b7 3e 76 d6 60 89 00 0a 2d c8 66 c2 ed 30 bb a5 0a 0d 45 7f 19 dc 6e b9 f3 14 00 00 20 c8 c3 a8 f1 bf f5 27 40 61 f4 bc 3a 7c af fb dc 96 16 09 4c a6 25 ca a6 5f 8e 76 ed 46 db 74 d3
complete record (679 octets): 17 03 03 02 a2 48 de 89 1d 9c 36 24 a6 7a 6c 6f 06 01 ab 7a c2 0c 1f 6a 9e 14 d2 e6 00 7e 99 9e 13 03 67 a8 af 1b cf ea 94 98 fb ce 19 df 45 05 ee ce 3a 25 da 52 3c be 55 ea 1b 3b da 4e 91 99 5e 45 5d 50 0a 4f aa 62 27 b7 11 1e 1c 85 47 e2 d7 c1 79 db 21 53 03 d2 58 27 f3 cd 18 f4 8f 64 91 32 8c f5 c0 f8 14 d3 88 15 0b d9 e9 26 4a ae 49 1d b6 99 50 69 be a1 76 65 d5 e0 c8 17 28 4d 4a c2 18 80 05 4c 36 57 33 1e 23 a9 30 4d c8 8a 15 c0 4e c8 0b d3 85 2b f7 f9 d3 c6 61 5b 15 fa c8 3b bc a0 31 c6 d2 31 0d 9f 5d 7a 4b 02 0a 4f 7c 19 06 2b 65 c0 5a 1d 32 64 b5 57 ec 9d 8e 0f 7c ee 27 e3 6f 79 30 39 de 8d d9 6e df ca 90 09 e0 65 10 34 bf f3 1d 7f 34 9e ec e0 1d 99 fc b5 fc ab 84 0d 77 07 c7 22 99 c3 b5 d0 45 64 e8 80 a3 3c 5e 84 6c 76 2e 3d 92 2b b5 53 03 d1 d8 7c c0 f0 65 73 f1 7d cb 9b 8f fd 35 bb d8 83 c1 cb 3a a2 4f cc 32 50 05 f7 68 ce 2f b6 24 ca 97 b6 c4 d9 8e 17 f3 5b c2 c7 94 0a 06 10 0c 2d 44 8d b7 18 0b 2d 86 21 64 43 5c 9c 21 0e 98 60 39 4e 05 aa b2 3f f1 b0 20 3f 66 2c 58 8d a5 bc 44 11 47 7a 30 b4 11 36 c4 88 a0 a6 3f ca b5 c1 5a c6 13 22 6d ae 82 7a 1d 1f e9 5e ce 6b 30 bc ee 15 60 a8 d4 08 d2 64 55 5e 76 0f 9b fc 62 4c 2c 87 fd 04 56 c9 bf b4 1b cd 1a 7b 21 27 86 d2 b6 7f d5 78 04 fa cf a1 ee f7 cf 29 19 d8 b9 98 c9 78 9f 76 3b 4d 9c aa 09 3a 9d ed 43 17 5d 46 a7 6b 4d 54 f0 ce 0c 5d 22 59 b6 07 e3 0a 9d 24 12 63 87 4f a5 9d 6f 57 0d c4 0d 83 a2 d8 3b f9 e9 85 0d 45 4c 57 80 65 35 a8 99 8a e0 35 7d f9 2f 00 b9 66 73 44 c2 41 14 cc c9 ef 53 91 24 b2 04 e7 e6 e7 48 c3 0a 28 a3 d1 d1 83 99 72 43 ea cc bb d3 3b 0c 11 15 a0 32 71 06 a1 e6 a7 52 71 d4 98 30 86 f6 32 ff 0e b8 b4 c6 31 02 cb ce f5 bb 72 da e1 27 9d 5d e8 eb 19 09 6d 8c db 07 fa 8e a9 89 78 8f ac 23 e6 6e 04 88 c1 93 f3 f3 fe a8 c8 83 88 96 bf 3a e4 b6 84 8d 42 ce d4 bd f4 1a be 6f c3 31 b4 42 25 e7 a1 f7 d3 56 41 47 d5 45 8e 71 aa 90 9c b0 2b e9 58 bb c4 2e 3a a5 a2 7c c6 ea f4 b6 fe 51 ae 44 95 69 4d 8a b6 32 0a ab 92 01 83 fd 5b 31 a3 59 04 2f bd 67 39 1e c5 e4 d1 89 2a 2e 52 10 14 1a 49 4e 93 01 b2 4a 11 3c 47 4c 7f 2a 73 45 78 47
{server} derive secret "tls13 c ap traffic":
PRK (32 octets): 62 81 12 da e2 f7 02 48 80 63 e4 2d e6 c8 50 a5 c0 82 0b 90 90 3e 00 ab c3 18 75 da 03 d4 bc 5b
hash (32 octets): 07 07 dc ac 7b 2f a4 28 cc 7f 69 16 94 a2 59 0c 80 6a aa 5c 0c f5 08 7e d5 38 50 12 e7 f9 6c d4
info (54 octets): 00 20 12 74 6c 73 31 33 20 63 20 61 70 20 74 72 61 66 66 69 63 20 07 07 dc ac 7b 2f a4 28 cc 7f 69 16 94 a2 59 0c 80 6a aa 5c 0c f5 08 7e d5 38 50 12 e7 f9 6c d4
expanded (32 octets): 74 3e 4c 6b 56 cf 39 09 d1 b0 6d 01 95 6c cd 2c 4b 37 75 84 49 ae c4 1d 98 da e4 49 24 ea a2 99
Okay so this is the last stretch of the Compatibility Mode trace, bestie, and it's where the server finishes its keys and sends its alert 🫶 I'm keeping every octet exactly as written 💅
{server} derive secret "tls13 s ap traffic":
PRK (32 octets): 62 81 12 da e2 f7 02 48 80 63 e4 2d e6 c8 50 a5 c0 82 0b 90 90 3e 00 ab c3 18 75 da 03 d4 bc 5b
hash (32 octets): 07 07 dc ac 7b 2f a4 28 cc 7f 69 16 94 a2 59 0c 80 6a aa 5c 0c f5 08 7e d5 38 50 12 e7 f9 6c d4
info (54 octets): 00 20 12 74 6c 73 31 33 20 73 20 61 70 20 74 72 61 66 66 69 63 20 07 07 dc ac 7b 2f a4 28 cc 7f 69 16 94 a2 59 0c 80 6a aa 5c 0c f5 08 7e d5 38 50 12 e7 f9 6c d4
expanded (32 octets): b6 b8 14 4a a3 35 ed 30 59 c0 c9 c8 f0 ec ab f7 af c9 4a f6 64 3b de cd fd 92 10 18 8f ab 74 51
{server} derive secret "tls13 exp master":
PRK (32 octets): 62 81 12 da e2 f7 02 48 80 63 e4 2d e6 c8 50 a5 c0 82 0b 90 90 3e 00 ab c3 18 75 da 03 d4 bc 5b
hash (32 octets): 07 07 dc ac 7b 2f a4 28 cc 7f 69 16 94 a2 59 0c 80 6a aa 5c 0c f5 08 7e d5 38 50 12 e7 f9 6c d4
info (52 octets): 00 20 10 74 6c 73 31 33 20 65 78 70 20 6d 61 73 74 65 72 20 07 07 dc ac 7b 2f a4 28 cc 7f 69 16 94 a2 59 0c 80 6a aa 5c 0c f5 08 7e d5 38 50 12 e7 f9 6c d4
expanded (32 octets): fb 69 12 1c ea 33 4d b4 59 e1 22 72 d1 79 ba ca 23 69 b6 43 d1 1a 6a c7 2b 8b 27 a5 c9 64 fe b1
{server} derive write traffic keys for application data:
PRK (32 octets): b6 b8 14 4a a3 35 ed 30 59 c0 c9 c8 f0 ec ab f7 af c9 4a f6 64 3b de cd fd 92 10 18 8f ab 74 51
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): ed c4 cb d0 04 1c 28 cc 71 67 44 1d 7c a5 3e 6a
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): bf 6c 7d 8e 0a 95 45 b4 27 dc f1 39
{server} derive read traffic keys for handshake data:
PRK (32 octets): 2c 3c b2 4a 10 81 ed b5 95 18 ee 68 61 e8 9a 6b 72 b3 80 1a fe 77 13 e4 cb bc 21 c0 79 5b f8 31
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): 62 d1 3c 13 ff d7 40 2f c1 c0 9e 3d 16 36 65 cb
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): 71 66 f2 00 28 bf 14 6d cf bd 5a 40
{client} extract secret "early" (same as server early secret)
{client} derive secret for handshake "tls13 derived":
PRK (32 octets): 33 ad 0a 1c 60 7e c0 3b 09 e6 cd 98 93 68 0c e2 10 ad f3 00 aa 1f 26 60 e1 b2 2e 10 f1 70 f9 2a
hash (32 octets): e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
info (49 octets): 00 20 0d 74 6c 73 31 33 20 64 65 72 69 76 65 64 20 e3 b0 c4 42 98 fc 1c 14 9a fb f4 c8 99 6f b9 24 27 ae 41 e4 64 9b 93 4c a4 95 99 1b 78 52 b8 55
expanded (32 octets): 6f 26 15 a1 08 c7 02 c5 67 8f 54 fc 9d ba b6 97 16 c0 76 18 9c 48 25 0c eb ea c3 57 6c 36 11 ba
{client} extract secret "handshake" (same as server handshake secret)
{client} derive secret "tls13 c hs traffic" (same as server)
{client} derive secret "tls13 s hs traffic" (same as server)
{client} derive secret for master "tls13 derived" (same as server)
{client} extract secret "master" (same as server master secret)
{client} derive read traffic keys for handshake data (same as server handshake data write traffic keys)
{client} calculate finished "tls13 finished" (same as server)
{client} derive secret "tls13 c ap traffic" (same as server)
{client} derive secret "tls13 s ap traffic" (same as server)
{client} derive secret "tls13 exp master" (same as server) {client} send change_cipher_spec record:
payload (1 octets): 01
complete record (6 octets): 14 03 03 00 01 01
{client} derive write traffic keys for handshake data (same as server handshake data read traffic keys)
{client} derive read traffic keys for application data (same as server application data write traffic keys)
{client} calculate finished "tls13 finished":
PRK (32 octets): 2c 3c b2 4a 10 81 ed b5 95 18 ee 68 61 e8 9a 6b 72 b3 80 1a fe 77 13 e4 cb bc 21 c0 79 5b f8 31
hash (0 octets): (empty)
info (18 octets): 00 20 0e 74 6c 73 31 33 20 66 69 6e 69 73 68 65 64 00
expanded (32 octets): 77 34 1a bc 8c 0f fa b5 18 07 36 71 3e 41 d2 f6 65 c4 10 a4 04 c8 c2 1e dc d9 48 a4 44 0f d8 0c
finished (32 octets): 69 2c ab 15 5c c6 c1 00 ea d6 07 33 d0 61 7f 6f b0 9b 71 aa 1e 8c 9a cc bb bc 9e 8e d3 36 c1 dd
{client} construct a Finished handshake message:
Finished (36 octets): 14 00 00 20 69 2c ab 15 5c c6 c1 00 ea d6 07 33 d0 61 7f 6f b0 9b 71 aa 1e 8c 9a cc bb bc 9e 8e d3 36 c1 dd
{client} send handshake record:
payload (36 octets): 14 00 00 20 69 2c ab 15 5c c6 c1 00 ea d6 07 33 d0 61 7f 6f b0 9b 71 aa 1e 8c 9a cc bb bc 9e 8e d3 36 c1 dd
complete record (58 octets): 17 03 03 00 35 32 d0 30 e2 73 77 3a 86 96 c7 99 98 1a f6 ce d0 7f 87 48 2e 81 56 5e 39 4e 87 c8 67 f3 3d f3 d6 5b 75 06 f1 a6 26 af 91 d4 82 1d 5f 7a 1f 21 0e f8 dd 3c 6d 16
{client} derive write traffic keys for application data:
PRK (32 octets): 74 3e 4c 6b 56 cf 39 09 d1 b0 6d 01 95 6c cd 2c 4b 37 75 84 49 ae c4 1d 98 da e4 49 24 ea a2 99
key info (13 octets): 00 10 09 74 6c 73 31 33 20 6b 65 79 00
key expanded (16 octets): 33 d7 f9 70 97 56 c9 66 48 8a d4 43 84 37 e6 73
iv info (12 octets): 00 0c 08 74 6c 73 31 33 20 69 76 00
iv expanded (12 octets): c5 f3 0d 34 b0 e9 1b 7d 6c 8e ea 65
{client} derive secret "tls13 res master":
PRK (32 octets): 62 81 12 da e2 f7 02 48 80 63 e4 2d e6 c8 50 a5 c0 82 0b 90 90 3e 00 ab c3 18 75 da 03 d4 bc 5b
hash (32 octets): a0 21 d3 a0 5b d4 18 a7 72 81 38 75 ef 79 b0 af 68 c5 12 32 15 42 7a b7 33 3f 8c 27 72 2a 9f d5
info (52 octets): 00 20 10 74 6c 73 31 33 20 72 65 73 20 6d 61 73 74 65 72 20 a0 21 d3 a0 5b d4 18 a7 72 81 38 75 ef 79 b0 af 68 c5 12 32 15 42 7a b7 33 3f 8c 27 72 2a 9f d5
expanded (32 octets): 0b 5d 44 07 ce a0 a4 2a 3a 81 dd 47 76 47 b7 fe 91 80 db 29 7e 51 14 f1 ad 87 96 b4 dc 47 50 04
{server} calculate finished "tls13 finished" (same as client)
{server} derive read traffic keys for application data (same as client application data write traffic keys)
{server} derive secret "tls13 res master" (same as client)
{client} send alert record:
payload (2 octets): 01 00
complete record (24 octets): 17 03 03 00 13 0f 62 91 55 38 2d ba 23 c4 e2 c5 f7 f8 4e 6f 2e d3 08 3d
{server} send alert record:
payload (2 octets): 01 00
complete record (24 octets): 17 03 03 00 13 b7 25 7b 0f ec af 69 d4 f0 9e 3f 89 1e 2a 25 d1 e2 88 45
# 8. Security Considerations ✨
Okay, real talk about the security bit 💀 Please don't use the private key that's included in this document. It's way too small to give you any meaningful security, and it's now super well known, so it's basically public knowledge 🙈
# 9. IANA Considerations
Good news for the paperwork people: this document has no IANA actions 🎀
# 10. References
## 10.1. Normative References
Here's the one doc you actually need to read first 📚
- **[TLS13]** Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018, `<https://www.rfc-editor.org/info/rfc8446>`.
## 10.2. Informative References
These ones are good background reading, no pressure 🌸
- **[FIPS.186-4.2013]** National Institute of Standards and Technology, "Digital Signature Standard (DSS)", FIPS 186-4, DOI 10.6028/NIST.FIPS.186-4, July 2013, `<https://nvlpubs.nist.gov/nistpubs/fips/nist.fips.186-4.pdf>`.
- **[NSS]** Mozilla, "Network Security Services", November 2018, `<https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS>`.
- **[RFC5869]** Krawczyk, H. and P. Eronen, "HMAC-based Extract-and-Expand Key Derivation Function (HKDF)", RFC 5869, DOI 10.17487/RFC5869, May 2010, `<https://www.rfc-editor.org/info/rfc5869>`.
- **[RFC7748]** Langley, A., Hamburg, M., and S. Turner, "Elliptic Curves for Security", RFC 7748, DOI 10.17487/RFC7748, January 2016, `<https://www.rfc-editor.org/info/rfc7748>`.
# Acknowledgements
<pink>Huge shoutout</pink> to the tests that were written for Network Security Services 🫶 This document was generated from them, and none of it would have happened without Franziskus Kiefer, Eric Rescorla, and Tim Taubert, who all did a ton of the work in NSS 👑
# Author's Address
Martin Thomson 🦋
Mozilla
Email: `martin.thomson@gmail.com` 💜
📦 where this page comes from
- ietf: rfc8448 2019-01
- 💖 girlified by claude-haiku-5-5 on : a language model's rewrite of the original, under its terms