mirror of https://github.com/bitcoin/bitcoin.git
94 lines
2.4 KiB
C++
94 lines
2.4 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2022 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <hash.h>
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#include <key.h>
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#include <key_io.h>
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#include <pubkey.h>
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#include <uint256.h>
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#include <util/message.h>
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#include <util/strencodings.h>
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#include <cassert>
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#include <optional>
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#include <string>
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#include <variant>
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#include <vector>
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/**
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* Text used to signify that a signed message follows and to prevent
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* inadvertently signing a transaction.
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*/
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const std::string MESSAGE_MAGIC = "Bitcoin Signed Message:\n";
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MessageVerificationResult MessageVerify(
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const std::string& address,
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const std::string& signature,
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const std::string& message)
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{
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CTxDestination destination = DecodeDestination(address);
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if (!IsValidDestination(destination)) {
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return MessageVerificationResult::ERR_INVALID_ADDRESS;
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}
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if (std::get_if<PKHash>(&destination) == nullptr) {
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return MessageVerificationResult::ERR_ADDRESS_NO_KEY;
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}
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auto signature_bytes = DecodeBase64(signature);
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if (!signature_bytes) {
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return MessageVerificationResult::ERR_MALFORMED_SIGNATURE;
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}
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CPubKey pubkey;
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if (!pubkey.RecoverCompact(MessageHash(message), *signature_bytes)) {
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return MessageVerificationResult::ERR_PUBKEY_NOT_RECOVERED;
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}
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if (!(PKHash(pubkey) == *std::get_if<PKHash>(&destination))) {
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return MessageVerificationResult::ERR_NOT_SIGNED;
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}
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return MessageVerificationResult::OK;
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}
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bool MessageSign(
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const CKey& privkey,
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const std::string& message,
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std::string& signature)
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{
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std::vector<unsigned char> signature_bytes;
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if (!privkey.SignCompact(MessageHash(message), signature_bytes)) {
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return false;
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}
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signature = EncodeBase64(signature_bytes);
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return true;
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}
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uint256 MessageHash(const std::string& message)
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{
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HashWriter hasher{};
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hasher << MESSAGE_MAGIC << message;
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return hasher.GetHash();
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}
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std::string SigningResultString(const SigningResult res)
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{
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switch (res) {
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case SigningResult::OK:
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return "No error";
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case SigningResult::PRIVATE_KEY_NOT_AVAILABLE:
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return "Private key not available";
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case SigningResult::SIGNING_FAILED:
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return "Sign failed";
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// no default case, so the compiler can warn about missing cases
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}
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assert(false);
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}
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