bool CryptoECDSA::VerifyPublicKeyValid(SecureBinaryData const & pubKey65)
{
if(CRYPTO_DEBUG)
{
cout << "BinPub: " << pubKey65.toHexStr() << endl;
}
// Basically just copying the ParsePublicKey method, but without
// the assert that would throw an error from C++
SecureBinaryData pubXbin(pubKey65.getSliceRef( 1,32));
SecureBinaryData pubYbin(pubKey65.getSliceRef(33,32));
CryptoPP::Integer pubX;
CryptoPP::Integer pubY;
pubX.Decode(pubXbin.getPtr(), pubXbin.getSize(), UNSIGNED);
pubY.Decode(pubYbin.getPtr(), pubYbin.getSize(), UNSIGNED);
BTC_ECPOINT publicPoint(pubX, pubY);
// Initialize the public key with the ECP point just created
BTC_PUBKEY cppPubKey;
cppPubKey.Initialize(CryptoPP::ASN1::secp256k1(), publicPoint);
// Validate the public key -- not sure why this needs a PRNG
static BTC_PRNG prng;
return cppPubKey.Validate(prng, 3);
}
bool CryptoECDSA::VerifyPublicKeyValid(SecureBinaryData const & pubKey)
{
if(CRYPTO_DEBUG)
{
cout << "BinPub: " << pubKey.toHexStr() << endl;
}
SecureBinaryData keyToCheck(65);
// To support compressed keys, we'll just check to see if a key is compressed
// and then decompress it.
if(pubKey.getSize() == 33) {
keyToCheck = UncompressPoint(pubKey);
}
else {
keyToCheck = pubKey;
}
// Basically just copying the ParsePublicKey method, but without
// the assert that would throw an error from C++
SecureBinaryData pubXbin(keyToCheck.getSliceRef( 1,32));
SecureBinaryData pubYbin(keyToCheck.getSliceRef(33,32));
CryptoPP::Integer pubX;
CryptoPP::Integer pubY;
pubX.Decode(pubXbin.getPtr(), pubXbin.getSize(), UNSIGNED);
pubY.Decode(pubYbin.getPtr(), pubYbin.getSize(), UNSIGNED);
BTC_ECPOINT publicPoint(pubX, pubY);
// Initialize the public key with the ECP point just created
BTC_PUBKEY cppPubKey;
cppPubKey.Initialize(CryptoPP::ASN1::secp256k1(), publicPoint);
// Validate the public key -- not sure why this needs a PRNG
BTC_PRNG prng;
return cppPubKey.Validate(prng, 3);
}
BTC_PUBKEY CryptoECDSA::ParsePublicKey(SecureBinaryData const & pubKey65B)
{
SecureBinaryData pubXbin(pubKey65B.getSliceRef( 1,32));
SecureBinaryData pubYbin(pubKey65B.getSliceRef(33,32));
return ParsePublicKey(pubXbin, pubYbin);
}