EVP_PKEY_GET_DEFAULT_DIGEST_NID(3ossl) OpenSSL
NAME
EVP_PKEY_get_default_digest_nid, EVP_PKEY_get_default_digest_name - get
default signature digest
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(3) 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(3) 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>.
3.1.2 2023-08-01
EVP_PKEY_GET_DEFAULT_DIGEST_NID(3ossl)
openssl 3.1.2 - Generated Mon Aug 14 13:23:42 CDT 2023