EVP_CIPHER-NULL(7SSL)

📦
version 4.0.3 · 11 versions
, in ubuntu stonking

💖 EVP_CIPHER-NULL — the NULL EVP_CIPHER implementation 💖

okay bestie, this is EVP_CIPHER-NULL from the 7SSL corner of the OpenSSL manpage universe. yes it's a real page, no it's not boring, sit down, hydrate, let's go 🫶

✨ NAME ✨

EVP_CIPHER-NULL — the NULL EVP_CIPHER implementation. that's it, that's the name, short and iconic 💅

🌸 DESCRIPTION 🌸

So basically, this is support for a NULL symmetric encryption using the EVP_CIPHER API. 🫧

When is it a thing? When the TLS cipher suite is TLS_NULL_WITH_NULL_NULL. And what does it do, you ask? literally nothing — it does no encryption (it just copies the data) and it has a mac size of zero. it's the cipher that showed up, said "I'm just gonna copy this", and left. main character energy but make it minimal 💀✨

🎀 Algorithm Name 🎀

the following algorithm is available in the default provider:

  • "NULL"

🦋 Parameters 🦋

this implementation supports the following parameters:

Gettable EVP_CIPHER parameters

See "Gettable EVP_CIPHER parameters" in EVP_EncryptInit(3) — go read that bestie, it's the lore 📖

Gettable EVP_CIPHER_CTX parameters

  • "keylen" (OSSL_CIPHER_PARAM_KEYLEN) <unsigned integer>
  • "ivlen" (OSSL_CIPHER_PARAM_IVLEN and <OSSL_CIPHER_PARAM_AEAD_IVLEN) <unsigned integer>
  • "tls-mac" (OSSL_CIPHER_PARAM_TLS_MAC) <octet ptr>

See "PARAMETERS" in EVP_EncryptInit(3) for further information. yes, again, it's all in there 🌈

💜 Settable EVP_CIPHER_CTX parameters 💜

  • "tls-mac-size" (OSSL_CIPHER_PARAM_TLS_MAC_SIZE) <unsigned integer>

See "PARAMETERS" in EVP_EncryptInit(3) for further information. (third time's the charm, we love a consistent cross-reference 👑)

👑 CONFORMING TO 👑

RFC 5246 section-6.2.3.1 — yes, it's got the receipts, it's standards-compliant fr fr 📜

🔥 SEE ALSO 🔥

Copyright 2023 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>.

ngl, that's the whole page. the cipher does nothing, and this manpage tells you exactly how it does nothing. iconic behavior honestly 🌸

and that's a wrap bestie!! this was page EVP_CIPHER-NULL(7SSL) from OpenSSL 4.0.3, dated 2026-09-29 💅✨ mwah, go encrypt something (or, y'know, don't — that's literally the whole point of this one) 🦋🎀

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