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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2022 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 <common/signmessage.h>
#include <hash.h>
#include <key.h>
#include <key_io.h>
#include <pubkey.h>
#include <uint256.h>
#include <util/strencodings.h>
#include <cassert>
#include <optional>
#include <string>
#include <variant>
#include <vector>
/**
* Text used to signify that a signed message follows and to prevent
* inadvertently signing a transaction.
*/
const std::string MESSAGE_MAGIC = "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 (std::get_if<PKHash>(&destination) == nullptr) {
return MessageVerificationResult::ERR_ADDRESS_NO_KEY;
}
auto signature_bytes = DecodeBase64(signature);
if (!signature_bytes) {
return MessageVerificationResult::ERR_MALFORMED_SIGNATURE;
}
CPubKey pubkey;
if (!pubkey.RecoverCompact(MessageHash(message), *signature_bytes)) {
return MessageVerificationResult::ERR_PUBKEY_NOT_RECOVERED;
}
if (!(PKHash(pubkey) == *std::get_if<PKHash>(&destination))) {
return MessageVerificationResult::ERR_NOT_SIGNED;
}
return MessageVerificationResult::OK;
}
bool MessageSign(
const CKey& privkey,
const std::string& message,
std::string& signature)
{
std::vector<unsigned char> signature_bytes;
if (!privkey.SignCompact(MessageHash(message), signature_bytes)) {
return false;
}
signature = EncodeBase64(signature_bytes);
return true;
}
uint256 MessageHash(const std::string& message)
{
HashWriter hasher{};
hasher << MESSAGE_MAGIC << message;
return hasher.GetHash();
}
std::string SigningResultString(const SigningResult res)
{
switch (res) {
case SigningResult::OK:
return "No error";
case SigningResult::PRIVATE_KEY_NOT_AVAILABLE:
return "Private key not available";
case SigningResult::SIGNING_FAILED:
return "Sign failed";
// no default case, so the compiler can warn about missing cases
}
assert(false);
}
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