1=pod
2
3=head1 NAME
4
5EVP_PKEY_get_default_digest_nid - get default signature digest
6
7=head1 SYNOPSIS
8
9 #include <openssl/evp.h>
10 int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid);
11
12=head1 DESCRIPTION
13
14The EVP_PKEY_get_default_digest_nid() function sets B<pnid> to the default
15message digest NID for the public key signature operations associated with key
16B<pkey>.
17
18=head1 NOTES
19
20For all current standard OpenSSL public key algorithms SHA1 is returned.
21
22=head1 RETURN VALUES
23
24The EVP_PKEY_get_default_digest_nid() function returns 1 if the message digest
25is advisory (that is other digests can be used) and 2 if it is mandatory (other
26digests can not be used).  It returns 0 or a negative value for failure. In
27particular a return value of -2 indicates the operation is not supported by the
28public key algorithm.
29
30=head1 SEE ALSO
31
32L<EVP_PKEY_CTX_new(3)|EVP_PKEY_CTX_new(3)>,
33L<EVP_PKEY_sign(3)|EVP_PKEY_sign(3)>,
34L<EVP_PKEY_verify(3)|EVP_PKEY_verify(3)>,
35L<EVP_PKEY_verify_recover(3)|EVP_PKEY_verify_recover(3)>,
36
37=head1 HISTORY
38
39This function was first added to OpenSSL 1.0.0.
40
41=cut
42