EVP_PKEY_CTX_GET_ALGOR(3SSL)

💖 EVP_PKEY_CTX_GET_ALGOR 💖

okay bestie, welcome to EVP_PKEY_CTX_GET_ALGOR(3SSL) — this is the girlies' guide to handing AlgorithmIdentifiers back and forth with algorithm implementations 🦋✨

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✨ NAME ✨

EVP_CIPHER_CTX_get_algor</p>, EVP_CIPHER_CTX_get_algor_params</p>, EVP_CIPHER_CTX_set_algor_params</p>, EVP_PKEY_CTX_get_algor</p>, EVP_PKEY_CTX_get_algor_params</p>, EVP_PKEY_CTX_set_algor_params</p> — passing an AlgorithmIdentifier and its params to and from algorithm implementations, no cap 🎀

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✨ SYNOPSIS ✨

int EVP_TYPE_CTX_get_algor(EVP_TYPE_CTX *ctx, X509_ALGOR **alg);
int EVP_TYPE_CTX_get_algor_params(EVP_TYPE_CTX *ctx, X509_ALGOR *alg);
int EVP_TYPE_CTX_set_algor_params(EVP_TYPE_CTX *ctx, const X509_ALGOR *alg);

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✨ DESCRIPTION ✨

so like, in this whole description and in the SYNOPSIS up there ⬆️, TYPE is serving as a lil placeholder for, literally, any EVP operation type. it's giving "insert your fave here" 💅

🌸 EVP_TYPE_CTX_get_algor()

she attempts to retrieve a whole entire AlgorithmIdentifier from the EVP_TYPE implementation, and populates *alg with it. 💫

if alg is NULL, calling her is lowkey just a vibe check — it tells you whether calling this function is even supported at all by the EVP_TYPE implementation. 👀

and if *alg is NULL, space gets allocated automatically and assigned to *alg. iconic, she does it herself. ✨

🎀 EVP_TYPE_CTX_get_algor_params()

she attempts to retrieve the parameters part of an AlgorithmIdentifier from the EVP_TYPE implementation and populates alg-parameters> with it. same energy as above: if alg is NULL, calling her is just the support-check vibe check for the EVP_TYPE implementation. 🫶

if alg->parameters is NULL, space will be allocated automatically and assigned to alg->parameters. 🌈

if alg->parameters is not NULL... girl. 😭 its previous contents will be overwritten with the retrieved AlgorithmIdentifier parameters. Beware! 💀

🦋 EVP_TYPE_CTX_set_algor_params()

she attempts to pass alg->parameters to the EVP_TYPE implementation. and yep, you already know — if alg is NULL, calling her serves to see if calling her is supported at all by the EVP_TYPE implementation. main character check-in behavior fr fr 👑

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✨ RETURN VALUES ✨

all of these functions return 1 for success 🎉 and 0 or a negative number if an error occurs 😭.

in particular, -2 is returned when the function isn't supported by the EVP_TYPE implementation. not supported = not invited, periodt. 💅

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✨ HISTORY ✨

these functions were added in OpenSSL 3.4. new girls on the block, we love to see it 🌸✨

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✨ COPYRIGHT ✨

Copyright 2024 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>. 📜

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mwah 💋 that's the whole page bestie — go forth and pass those AlgorithmIdentifiers around responsibly.

version 4.0.3 · dated 2026-09-29 · signing off, xoxo 🫶💖