EVP_PKEY_GET_DEFAULT_DIGEST_NID
Section: OpenSSL (3)
Updated: 2021-03-26
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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 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>.