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EVP_PKEY_CTX_get_algor(3)           OpenSSL          EVP_PKEY_CTX_get_algor(3)


NAME
       EVP_CIPHER_CTX_get_algor, EVP_CIPHER_CTX_get_algor_params,
       EVP_CIPHER_CTX_set_algor_params, EVP_PKEY_CTX_get_algor,
       EVP_PKEY_CTX_get_algor_params, EVP_PKEY_CTX_set_algor_params - pass
       AlgorithmIdentifier and its params to/from algorithm implementations

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);

DESCRIPTION
       In the description here and the "SYNOPSIS" above, TTYYPPEE is used as a
       placeholder for any EVP operation type.

       EVP_TTYYPPEE_CTX_get_algor() attempts to retrieve a complete
       AlgorithmIdentifier from the EVP_TTYYPPEE implementation, and populates
       *alg with it.  If alg is NULL, calling this function will serve to see
       if calling this function is supported at all by the EVP_TTYYPPEE
       implementation.  If *alg is NULL, space will be allocated
       automatically, and assigned to *alg.

       EVP_TTYYPPEE_CTX_get_algor_params() attempts to retrieve the parameters
       part of an AlgorithmIdentifier from the EVP_TTYYPPEE implementation, and
       populates alg-parameters> with it.  If alg is NULL, calling this
       function will serve to see if calling this function is supported at all
       by the EVP_TTYYPPEE implementation.  If alg->parameters is NULL, space will
       be allocated automatically, and assigned to  alg->parameters.  If
       alg->parameters is not NULL, its previous contents will be overwritten
       with the retrieved AlgorithmIdentifier parameters.  Beware!

       EVP_TTYYPPEE_CTX_set_algor_params() attempts to pass alg->parameters to the
       EVP_TTYYPPEE implementation.  If alg is NULL, calling this function will
       serve to see if calling this function is supported at all by the
       EVP_TTYYPPEE implementation.

RETURN VALUES
       All 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_TTYYPPEE implementation.

HISTORY
       These functions were added in OpenSSL 3.4.

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>.

3.5.1                             2025-07-01         EVP_PKEY_CTX_get_algor(3)