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=pod
=head1 NAME
EVP_PKEY_get_default_digest_nid - get default signature digest
=head1 SYNOPSIS
#include <openssl/evp.h>
int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid);
=head1 DESCRIPTION
The EVP_PKEY_get_default_digest_nid() function sets B<pnid> to the default
message digest NID for the public key signature operations associated with key
B<pkey>.
=head1 NOTES
For all current standard OpenSSL public key algorithms SHA1 is returned.
=head1 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.
=head1 SEE ALSO
L<EVP_PKEY_CTX_new(3)|EVP_PKEY_CTX_new(3)>,
L<EVP_PKEY_sign(3)|EVP_PKEY_sign(3)>,
L<EVP_PKEY_verify(3)|EVP_PKEY_verify(3)>,
L<EVP_PKEY_verify_recover(3)|EVP_PKEY_verify_recover(3)>,
=head1 HISTORY
This function was first added to OpenSSL 1.0.0.
=cut