"Digest signature" allowed you to sign a digest directly, without hasing it
again. This is no longer directly supported, but you can accomplish the same
thing by creating a dummy "hash" algorithm that just returns the input
without actually hashing it. To create DummyHash, override
HashTransformation and implement the 3 pure abstract functions Update,
DigestSize, and TruncatedFinal. It should be pretty obvious how to do that
so I won't go into details. Then you can use NR<DummyHash>.
----- Original Message -----
From: "Bill Shanahan" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, November 03, 2005 11:27 AM
Subject: Digest Signature Scheme
It looks to me that in the 5.2 library, there are no equivalents to the
5.0 calls
NR<SHA>::Verifier::GetDigestSignatureScheme()
NR<SHA>::Signer::GetDigestSignatureScheme()
It looks like digest signatures are deprecated, but I have to maintain
backward compatibility. So it looks like I can't upgrade to 5.2 yet. I
need to have a version of my software that reads digest signatures but
writes message signatures. I can use 5.0 to make that. Then after a
while I can release a 5.2 upgrade and deprecate the old file format.
Do I understand correctly?
