// Copyright (c) 2014-2018 The Dash Core developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include "base58.h"
#include "hash.h"
#include "validation.h" // For strMessageMagic
#include "messagesigner.h"
#include "tinyformat.h"
#include "utilstrencodings.h"

bool CMessageSigner::GetKeysFromSecret(const std::string& strSecret, CKey& keyRet, CPubKey& pubkeyRet)
{
    CBitcoinSecret vchSecret;

    if(!vchSecret.SetString(strSecret)) return false;

    keyRet = vchSecret.GetKey();
    pubkeyRet = keyRet.GetPubKey();

    return true;
}

bool CMessageSigner::SignMessage(const std::string& strMessage, std::vector<unsigned char>& vchSigRet, const CKey& key)
{
    CHashWriter ss(SER_GETHASH, 0);
    ss << strMessageMagic;
    ss << strMessage;

    return CHashSigner::SignHash(ss.GetHash(), key, vchSigRet);
}

bool CMessageSigner::VerifyMessage(const CPubKey& pubkey, const std::vector<unsigned char>& vchSig, const std::string& strMessage, std::string& strErrorRet)
{
    return VerifyMessage(pubkey.GetID(), vchSig, strMessage, strErrorRet);
}

bool CMessageSigner::VerifyMessage(const CKeyID& keyID, const std::vector<unsigned char>& vchSig, const std::string& strMessage, std::string& strErrorRet)
{
    CHashWriter ss(SER_GETHASH, 0);
    ss << strMessageMagic;
    ss << strMessage;

    return CHashSigner::VerifyHash(ss.GetHash(), keyID, vchSig, strErrorRet);
}

bool CHashSigner::SignHash(const uint256& hash, const CKey& key, std::vector<unsigned char>& vchSigRet)
{
    return key.SignCompact(hash, vchSigRet);
}

bool CHashSigner::VerifyHash(const uint256& hash, const CPubKey& pubkey, const std::vector<unsigned char>& vchSig, std::string& strErrorRet)
{
    return VerifyHash(hash, pubkey.GetID(), vchSig, strErrorRet);
}

bool CHashSigner::VerifyHash(const uint256& hash, const CKeyID& keyID, const std::vector<unsigned char>& vchSig, std::string& strErrorRet)
{
    CPubKey pubkeyFromSig;
    if(!pubkeyFromSig.RecoverCompact(hash, vchSig)) {
        strErrorRet = "Error recovering public key.";
        return false;
    }

    if(pubkeyFromSig.GetID() != keyID) {
        strErrorRet = strprintf("Keys don't match: pubkey=%s, pubkeyFromSig=%s, hash=%s, vchSig=%s",
                    keyID.ToString(), pubkeyFromSig.GetID().ToString(), hash.ToString(),
                    EncodeBase64(&vchSig[0], vchSig.size()));
        return false;
    }

    return true;
}