5 EVP_PKEY_get_default_digest_nid, EVP_PKEY_get_default_digest_name
6 - get default signature digest
10 #include <openssl/evp.h>
12 int EVP_PKEY_get_default_digest_name(EVP_PKEY *pkey,
13 char *mdname, size_t mdname_sz)
14 int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid);
18 EVP_PKEY_get_default_digest_name() fills in the default message digest
19 name for the public key signature operations associated with key
20 I<pkey> into I<mdname>, up to at most I<mdname_sz> bytes including the
21 ending NUL byte. The name could be C<"UNDEF">, signifying that no digest
24 EVP_PKEY_get_default_digest_nid() sets I<pnid> to the default message
25 digest NID for the public key signature operations associated with key
26 I<pkey>. Note that some signature algorithms (i.e. Ed25519 and Ed448)
27 do not use a digest during signing. In this case I<pnid> will be set
28 to NID_undef. This function is only reliable for legacy keys, which
29 are keys with a B<EVP_PKEY_ASN1_METHOD>; these keys have typically
30 been loaded from engines, or created with L<EVP_PKEY_assign_RSA(3)> or
35 For all current standard OpenSSL public key algorithms SHA256 is returned.
39 EVP_PKEY_get_default_digest_name() and EVP_PKEY_get_default_digest_nid()
40 both return 1 if the message digest is advisory (that is other digests
41 can be used) and 2 if it is mandatory (other digests can not be used).
42 They return 0 or a negative value for failure. In particular a return
43 value of -2 indicates the operation is not supported by the public key
48 L<EVP_PKEY_CTX_new(3)>,
50 L<EVP_PKEY_supports_digest_nid(3)>,
51 L<EVP_PKEY_verify(3)>,
52 L<EVP_PKEY_verify_recover(3)>,
56 This function was added in OpenSSL 1.0.0.
60 Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
62 Licensed under the Apache License 2.0 (the "License"). You may not use
63 this file except in compliance with the License. You can obtain a copy
64 in the file LICENSE in the source distribution or at
65 L<https://www.openssl.org/source/license.html>.