Latest update.

doc/man3/X509_digest.pod

@@ -2,7 +2,9 @@
 
 =head1 NAME
 
-X509_digest, X509_CRL_digest,
+X509_digest,
+X509_digest_sig,
+X509_CRL_digest,
 X509_pubkey_digest,
 X509_NAME_digest,
 X509_REQ_digest,
@@ -15,6 +17,7 @@ PKCS7_ISSUER_AND_SERIAL_digest
 
  int X509_digest(const X509 *data, const EVP_MD *type, unsigned char *md,
                  unsigned int *len);
+ ASN1_OCTET_STRING *X509_digest_sig(const X509 *cert);
 
  int X509_CRL_digest(const X509_CRL *data, const EVP_MD *type, unsigned char *md,
                      unsigned int *len);
@@ -36,8 +39,12 @@ PKCS7_ISSUER_AND_SERIAL_digest
 
 =head1 DESCRIPTION
 
+X509_digest_sig() calculates a digest of the given certificate
+using the same hash algorithm as in its signature.
+
 X509_pubkey_digest() returns a digest of the DER representation of the public
 key in the specified X509 B<data> object.
+
 All other functions described here return a digest of the DER representation
 of their entire B<data> objects.
 
@@ -49,12 +56,18 @@ to a place where the digest size will be stored.
 
 =head1 RETURN VALUES
 
-All functions described here return 1 for success and 0 for failure.
+X509_digest_sig() returns an ASN1_OCTET_STRING on success, else NULL.
+
+All other functions described here return 1 for success and 0 for failure.
 
 =head1 SEE ALSO
 
 L<EVP_sha1(3)>
 
+=head1 HISTORY
+
+The X509_digest_sig() function was added in OpenSSL 3.0.
+
 =head1 COPYRIGHT
 
 Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.