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EVP_PKEY_get_default_digest_nid(3)  OpenSSL EVP_PKEY_get_default_digest_nid(3)



NAME
       EVP_PKEY_get_default_digest_nid, EVP_PKEY_get_default_digest_name - get
       default signature digest

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #include <openssl/evp.h>

        int EVP_PKEY_get_default_digest_name(EVP_PKEY *pkey,
                                             char *mdname, size_t mdname_sz);
        int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid);

DESCRIPTION
       EVP_PKEY_get_default_digest_name() fills in the default message digest
       name for the public key signature operations associated with key pkey
       into mdname, up to at most mdname_sz bytes including the ending NUL
       byte.  The name could be "UNDEF", signifying that a digest must (for
       return value 2) or may (for return value 1) be left unspecified.

       EVP_PKEY_get_default_digest_nid() sets pnid to the default message
       digest NID for the public key signature operations associated with key
       pkey.  Note that some signature algorithms (i.e. Ed25519 and Ed448) do
       not use a digest during signing.  In this case pnid will be set to
       NID_undef.  This function is only reliable for legacy keys, which are
       keys with a EVP_PKEY_ASN1_METHOD; these keys have typically been loaded
       from engines, or created with EVP_PKEY_assign_RSA(3) or similar.

NOTES
       For all current standard OpenSSL public key algorithms SHA256 is
       returned.

RETURN VALUES
       EVP_PKEY_get_default_digest_name() and
       EVP_PKEY_get_default_digest_nid() both return 1 if the message digest
       is advisory (that is other digests can be used) and 2 if it is
       mandatory (other digests can not be used).  They return 0 or a negative
       value for failure.  In particular a return value of -2 indicates the
       operation is not supported by the public key algorithm.

SEE ALSO
       EVP_PKEY_CTX_new(3), EVP_PKEY_sign(3),
       EVP_PKEY_digestsign_supports_digest(3), EVP_PKEY_verify(3),
       EVP_PKEY_verify_recover(3),

HISTORY
       This function was added in OpenSSL 1.0.0.

COPYRIGHT
       Copyright 2006-2023 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>.



3.0.12                            2023-10-25
                                            EVP_PKEY_get_default_digest_nid(3)