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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 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>.