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 first added to 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>.

1.1.1                                              2023-05-24              EVP_PKEY_GET_DEFAULT_DIGEST_NID(3SSL)