EVP_KDF-PBKDF1(7ossl)

📦 version 3.5.0, in opensuse-leap 16.0

✨ EVP_KDF-PBKDF1 — the PBKDF1 era 💅

okay bestie, so this is the EVP_KDF-PBKDF1 page from the OpenSSL manual set, and it's literally all about the PBKDF1 password-based key derivation function 🎀

🌸 NAME 🌸

EVP_KDF-PBKDF1 — the PBKDF1 EVP_KDF implementation, no cap ✨

🦋 DESCRIPTION 🦋

This is your support for computing the PBKDF1 password-based KDF through the EVP_KDF API. It's giving "small but mighty" 🫶

The EVP_KDF-PBKDF1 algorithm implements the PBKDF1 password-based key derivation function, as described in RFC 8018. Basically it derives a key from a password using a salt and iteration count — that's the whole vibe 🔥

👑 Identity 👑

"PBKDF1" is the name for this implementation. That's the string you hand to the EVP_KDF_fetch() function, iykyk 💅

🌈 Supported parameters 🌈

Here's the whole menu of supported parameters, bestie — every single one:

  • "pass" (OSSL_KDF_PARAM_PASSWORD) — <octet string>
  • "salt" (OSSL_KDF_PARAM_SALT) — <octet string>
  • "iter" (OSSL_KDF_PARAM_ITER) — <unsigned integer>. This parameter has a default value of 0 and should be set. like, please set it 😭
  • "properties" (OSSL_KDF_PARAM_PROPERTIES) — <UTF8 string>
  • "digest" (OSSL_KDF_PARAM_DIGEST) — <UTF8 string>

The "properties" and "digest" parameters work exactly as described in "PARAMETERS" in EVP_KDF(3). That's the cross-reference moment, go read it 🧚

💜 NOTES 💜

A typical application of this algorithm is to derive keying material for an encryption algorithm from a password in "pass", a salt in "salt", and an iteration count. classic combo, honestly 🍓

Increasing the "iter" parameter slows down the algorithm, which makes it harder for an attacker to perform a brute force attack using a large number of candidate passwords. so yes, crank it up — slow and steady wins the security plot 🔥

No assumption is made regarding the given password. It is simply treated as a byte sequence. that's it, that's the treatment, no judgement 💅

⚠️ The legacy provider needs to be available in order to access this algorithm. not optional, bestie — no legacy provider, no PBKDF1 🙈

🎀 CONFORMING TO 🎀

RFC 8018 — that's the one ✨

🦋 SEE ALSO 🦋

go read these too, they're all part of the family 💖

🌸 HISTORY 🌸

This functionality was added in OpenSSL 3.0. iconic behavior, honestly 👑

Copyright 2021 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>.

and that's the page, bestie 🫶 — brought to you by 3.5.0, dated 2026-09-25, from the EVP_KDF-PBKDF1(7ossl) manual. slay 💖✨

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