I'm not familiar with ISO/IEC FDIS 9796-2, and I can't find much information about it (without paying to buy the standard). Is it some kind of signature scheme with message recovery (SSR)? I never really finished implementing support for discrete log-based SSR in Crypto++ (and nobody has complained about that before), so the only way to do it is to write your own code directly on top of the Integer and elliptic curve classes. You can try to reuse DL_Algorithm_GDSA in gfpcrypt.h, or copy the code out and build on top of that.
Or, if you want to try to finish the DL SSR framework in Crypto++, take a look at DL_VerifierBase::RecoverAndRestart() in pubkey.h. But unlike with RSA, message recovery with discrete log based schemes is complicated and ultimately kind of pointless. -------------------------------------------------- From: "Alexei" <[email protected]> Sent: Thursday, October 22, 2009 12:53 AM To: "Crypto++ Users" <[email protected]> Subject: Get MessageRepresentative from signature > > Hello! > > I am implementing Digital signature scheme 1 described in ISO/IEC FDIS > 9796-2. I have signature in binary form and public key. > I know, how to get MessageRepresentative in case of RSA: call member > ApplyFunction(...) of CryptoPP::RSA::PublicKey-object. > But I don't know how to get MessageRepresentative in case of DSA and > ECDSA... What I should do? Is their any general way to get > MessageRepresentative independent on type of public key? > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the "Crypto++ Users" Google Group. To unsubscribe, send an email to [email protected]. More information about Crypto++ and this group is available at http://www.cryptopp.com. -~----------~----~----~----~------~----~------~--~---
