given the following straight-forward example of verifying the
signature of a signed message, is it also possible to decrypt that
signed message to retreive the data i need from it?
AutoSeededRandomPool rng;
string message = "X3BA-9NSF-8N9Q-UWQC-U7FX-AZZF-JAJW";
// Signing
string PrivateKeyFile = "key.pv";
string SignedMessage = "";
FileSource privFile( PrivateKeyFile.c_str(), true, new
HexDecoder);
RSASSA_PKCS1v15_SHA_Signer priv(privFile);
StringSource s1(message, true,
new SignerFilter(rng, priv,
new HexEncoder(
new StringSink( SignedMessage )
)));
cout << SignedMessage << endl << endl; //the message in question.
i want to decrypt this later (see below)
// Validation
string PublicKeyFile = "key.pb";
FileSource pubFile( PublicKeyFile.c_str(), true, new HexDecoder );
RSASSA_PKCS1v15_SHA_Verifier pub(pubFile);
StringSource signatureFile( SignedMessage, true, new HexDecoder);
if (signatureFile.MaxRetrievable() != pub.SignatureLength()) throw
string( "Signature File Size Problem" );
SecByteBlock signature(pub.SignatureLength());
signatureFile.Get(signature, signature.size());
VerifierFilter *verifierFilter = new VerifierFilter(pub);
verifierFilter->Put(signature, pub.SignatureLength());
StringSource s2(message, true, verifierFilter);
if( false == verifierFilter->GetLastResult() ) throw string
( "Signature Verification Failed" );
cout << "Signature Verified" << cout; //that's cool and all, but
about that data. can i decrypt it??
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