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.

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.

HISTORY

This function was first added to OpenSSL 1.0.0.