EVP_SIGNATURE-HMAC(7ossl)

📦 version 3.5.0, in opensuse-leap 16.0

💅 EVP_SIGNATURE-HMAC 💅

okay so bestie, welcome to the 7ossl girlies club — this one's about EVP_SIGNATURE-HMAC, EVP_SIGNATURE-Siphash, EVP_SIGNATURE-Poly1305 and EVP_SIGNATURE-CMAC, aka the legacy EVP_PKEY MAC signature implementations. yes, that's a mouthful, drink some water 🍓

🌸 NAME 🌸

EVP_SIGNATURE-HMAC, EVP_SIGNATURE-Siphash, EVP_SIGNATURE-Poly1305, EVP_SIGNATURE-CMAC — the legacy EVP_PKEY MAC signature implementations. that's the whole squad, no cap 💖

✨ DESCRIPTION ✨

okay so here's the tea 🫖 the algorithms described here have legacy support for creating MACs using EVP_DigestSignInit(3) and related functions. and like… that is not the preferred way of creating MACs, bestie, i'm gonna be so real with you 😭 instead you should use the newer EVP_MAC_init(3) functions. this whole mechanism is provided for backwards compatibility with older versions of OpenSSL — it's giving vintage, it's giving "we keep it around for the old heads" 🎀

the same signature parameters can be set using EVP_PKEY_CTX_set_params() as can be set via EVP_MAC_CTX_set_params() for the underlying EVP_MAC. go check out EVP_MAC-HMAC(7), EVP_MAC-Siphash(7), EVP_MAC-Poly1305(7) and EVP_MAC-CMAC(7) for the details 🔍

and for the deets about parameters that are supported during the creation of an EVP_PKEY, look at EVP_PKEY-HMAC(7), EVP_PKEY-Siphash(7), EVP_PKEY-Poly1305(7) or EVP_PKEY-CMAC(7). iconique cross-referencing behavior, honestly 👑

⚠️ reminder bestie: this is the legacy path. it's supported, it's fine, but new code should be living that EVP_MAC_init(3) main character energy 💅

🦋 SEE ALSO 🦋

the whole friend group, in order, no one left behind 🫶

Copyright 2020 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>. read the license bestie, it's literally the law 💜

and that's the page!! mwah 💋 this was OpenSSL 3.5.0, dated 2026-09-25, filed under EVP_SIGNATURE-HMAC(7ossl) — go forth and MAC responsibly, ily ⭐🧚‍♀️

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