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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <hash.h> // For CHashWriter
#include <key_io.h> // For DecodeDestination()
#include <pubkey.h> // For CPubKey
#include <script/standard.h> // For CTxDestination, IsValidDestination(), PKHash
#include <serialize.h> // For SER_GETHASH
#include <util/message.h>
#include <util/strencodings.h> // For DecodeBase64()
#include <string>
#include <vector>
const std::string strMessageMagic = "Bitcoin Signed Message:\n";
MessageVerificationResult MessageVerify(
const std::string& address,
const std::string& signature,
const std::string& message)
{
CTxDestination destination = DecodeDestination(address);
if (!IsValidDestination(destination)) {
return MessageVerificationResult::ERR_INVALID_ADDRESS;
}
if (boost::get<PKHash>(&destination) == nullptr) {
return MessageVerificationResult::ERR_ADDRESS_NO_KEY;
}
bool invalid = false;
std::vector<unsigned char> signature_bytes = DecodeBase64(signature.c_str(), &invalid);
if (invalid) {
return MessageVerificationResult::ERR_MALFORMED_SIGNATURE;
}
CHashWriter ss(SER_GETHASH, 0);
ss << strMessageMagic;
ss << message;
CPubKey pubkey;
if (!pubkey.RecoverCompact(ss.GetHash(), signature_bytes)) {
return MessageVerificationResult::ERR_PUBKEY_NOT_RECOVERED;
}
if (!(CTxDestination(PKHash(pubkey)) == destination)) {
return MessageVerificationResult::ERR_NOT_SIGNED;
}
return MessageVerificationResult::OK;
}
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