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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 - get default signature digest
SYNOPSIS
        #include <openssl/evp.h>
        int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid);
DESCRIPTION
       The EVP_PKEY_get_default_digest_nid() function 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.
NOTES
       For all current standard OpenSSL public key algorithms SHA1 is
       returned.
RETURN VALUES
       The EVP_PKEY_get_default_digest_nid() function returns 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).  It returns 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_verify(3),
       EVP_PKEY_verify_recover(3),
HISTORY
       This function was added in OpenSSL 1.0.0.
COPYRIGHT
       Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.
       Licensed under the OpenSSL license (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>;.
1.1.1k                            2021-03-25EVP_PKEY_GET_DEFAULT_DIGEST_NID(3)