On Thu, Jan 24, 2019 at 8:28 AM Olli Savolainen
<[email protected]> wrote:
>
> Oh thanks, that actually seems to work. I had just forgotten the using
> directive so it seemed like SHA256 enum value didn't seem to work.
> Just curious, why is SHA3 different, or have I just messed up somehow?
It is probably you, but we can't seem to get you to provide your code
so we are left to speculate and guess.
Works for me...
$ cat test.cxx
#include "rsa.h"
#include "osrng.h"
#include "pssr.h"
#include "sha.h"
#include "sha3.h"
#include <iostream>
#include <string>
int main(int argc, char* argv[])
{
using namespace CryptoPP;
try
{
////////////////////////////////////////////////
// Generate keys
AutoSeededRandomPool rng;
InvertibleRSAFunction params;
params.GenerateRandomWithKeySize(rng, 3072);
RSA::PrivateKey privateKey(params);
RSA::PublicKey publicKey(params);
// Signing
//RSASS<PSSR, SHA256>::Signer signer(privateKey);
//RSASS<PSSR, SHA256>::Verifier verifier(publicKey);
RSASS<PSSR, SHA3_256>::Signer signer(privateKey);
RSASS<PSSR, SHA3_256>::Verifier verifier(publicKey);
// Setup
byte message[] = "RSA-PSSR Test";
size_t messageLen = sizeof(message);
////////////////////////////////////////////////
// Sign and Encode
SecByteBlock signature(signer.MaxSignatureLength(messageLen));
size_t signatureLen = signer.SignMessageWithRecovery(rng, message,
messageLen, NULL, 0, signature);
// Resize now we know the true size of the signature
signature.resize(signatureLen);
////////////////////////////////////////////////
// Verify and Recover
SecByteBlock recovered(
verifier.MaxRecoverableLengthFromSignatureLength(signatureLen)
);
DecodingResult result = verifier.RecoverMessage(recovered, NULL,
0, signature, signatureLen);
if (!result.isValidCoding) {
throw Exception(Exception::OTHER_ERROR, "Invalid Signature");
}
////////////////////////////////////////////////
// Use recovered message
// MaxSignatureLength is likely larger than messageLength
recovered.resize(result.messageLength);
std::string rec((const char*)recovered.begin(), recovered.size());
std::cout << rec << std::endl;
}
catch(const Exception& ex)
{
std::cerr << ex.what() << std::endl;
return 1;
}
return 0;
}
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