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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.
#ifndef BITCOIN_UTIL_MESSAGE_H
#define BITCOIN_UTIL_MESSAGE_H
#include <key.h> // For CKey
#include <uint256.h>
#include <string>
extern const std::string MESSAGE_MAGIC;
/** The result of a signed message verification.
* Message verification takes as an input:
* - address (with whose private key the message is supposed to have been signed)
* - signature
* - message
*/
enum class MessageVerificationResult {
//! The provided address is invalid.
ERR_INVALID_ADDRESS,
//! The provided address is valid but does not refer to a public key.
ERR_ADDRESS_NO_KEY,
//! The provided signature couldn't be parsed (maybe invalid base64).
ERR_MALFORMED_SIGNATURE,
//! A public key could not be recovered from the provided signature and message.
ERR_PUBKEY_NOT_RECOVERED,
//! The message was not signed with the private key of the provided address.
ERR_NOT_SIGNED,
//! The message verification was successful.
OK
};
/** Verify a signed message.
* @param[in] address Signer's bitcoin address, it must refer to a public key.
* @param[in] signature The signature in base64 format.
* @param[in] message The message that was signed.
* @return result code */
MessageVerificationResult MessageVerify(
const std::string& address,
const std::string& signature,
const std::string& message);
/** Sign a message.
* @param[in] privkey Private key to sign with.
* @param[in] message The message to sign.
* @param[out] signature Signature, base64 encoded, only set if true is returned.
* @return true if signing was successful. */
bool MessageSign(
const CKey& privkey,
const std::string& message,
std::string& signature);
/**
* Hashes a message for signing and verification in a manner that prevents
* inadvertently signing a transaction.
*/
uint256 MessageHash(const std::string& message);
#endif // BITCOIN_UTIL_MESSAGE_H
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