static UniValue verifymessage(const JSONRPCRequest& request)
{
if (request.fHelp || request.params.size() != 3)
throw std::runtime_error(
RPCHelpMan{"verifymessage",
"\nVerify a signed message\n",
{
{"address", RPCArg::Type::STR, RPCArg::Optional::NO, "The bitcoin address to use for the signature."},
{"signature", RPCArg::Type::STR, RPCArg::Optional::NO, "The signature provided by the signer in base 64 encoding (see signmessage)."},
{"message", RPCArg::Type::STR, RPCArg::Optional::NO, "The message that was signed."},
},
RPCResult{
"true|false (boolean) If the signature is verified or not.\n"
},
RPCExamples{
"\nUnlock the wallet for 30 seconds\n"
+ HelpExampleCli("walletpassphrase", "\"mypassphrase\" 30") +
"\nCreate the signature\n"
+ HelpExampleCli("signmessage", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\" \"my message\"") +
"\nVerify the signature\n"
+ HelpExampleCli("verifymessage", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\" \"signature\" \"my message\"") +
"\nAs a JSON-RPC call\n"
+ HelpExampleRpc("verifymessage", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\", \"signature\", \"my message\"")
},
}.ToString());
LOCK(cs_main);
std::string strAddress = request.params[0].get_str();
std::string strSign = request.params[1].get_str();
std::string strMessage = request.params[2].get_str();
CTxDestination destination = DecodeDestination(strAddress);
if (!IsValidDestination(destination)) {
throw JSONRPCError(RPC_TYPE_ERROR, "Invalid address");
}
const PKHash *pkhash = boost::get<PKHash>(&destination);
if (!pkhash) {
throw JSONRPCError(RPC_TYPE_ERROR, "Address does not refer to key");
}
bool fInvalid = false;
std::vector<unsigned char> vchSig = DecodeBase64(strSign.c_str(), &fInvalid);
if (fInvalid)
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Malformed base64 encoding");
CHashWriter ss(SER_GETHASH, 0);
ss << strMessageMagic;
ss << strMessage;
CPubKey pubkey;
if (!pubkey.RecoverCompact(ss.GetHash(), vchSig))
return false;
return (pubkey.GetID() == *pkhash);
}
static UniValue verifymessage(const JSONRPCRequest& request)
{
if (request.fHelp || request.params.size() != 3)
throw std::runtime_error(
"verifymessage \"address\" \"signature\" \"message\"\n"
"\nVerify a signed message\n"
"\nArguments:\n"
"1. \"address\" (string, required) The bitcoin address to use for the signature.\n"
"2. \"signature\" (string, required) The signature provided by the signer in base 64 encoding (see signmessage).\n"
"3. \"message\" (string, required) The message that was signed.\n"
"\nResult:\n"
"true|false (boolean) If the signature is verified or not.\n"
"\nExamples:\n"
"\nUnlock the wallet for 30 seconds\n"
+ HelpExampleCli("walletpassphrase", "\"mypassphrase\" 30") +
"\nCreate the signature\n"
+ HelpExampleCli("signmessage", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\" \"my message\"") +
"\nVerify the signature\n"
+ HelpExampleCli("verifymessage", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\" \"signature\" \"my message\"") +
"\nAs json rpc\n"
+ HelpExampleRpc("verifymessage", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\", \"signature\", \"my message\"")
);
LOCK(cs_main);
std::string strAddress = request.params[0].get_str();
std::string strSign = request.params[1].get_str();
std::string strMessage = request.params[2].get_str();
CTxDestination destination = DecodeDestination(strAddress);
if (!IsValidDestination(destination)) {
throw JSONRPCError(RPC_TYPE_ERROR, "Invalid address");
}
const CKeyID *keyID = boost::get<CKeyID>(&destination);
if (!keyID) {
throw JSONRPCError(RPC_TYPE_ERROR, "Address does not refer to key");
}
bool fInvalid = false;
std::vector<unsigned char> vchSig = DecodeBase64(strSign.c_str(), &fInvalid);
if (fInvalid)
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Malformed base64 encoding");
CHashWriter ss(SER_GETHASH, 0);
ss << strMessageMagic;
ss << strMessage;
CPubKey pubkey;
if (!pubkey.RecoverCompact(ss.GetHash(), vchSig))
return false;
return (pubkey.GetID() == *keyID);
}
bool TransactionSignatureChecker::VerifySignature(const std::vector<unsigned char>& vchSig, const CPubKey& pubkey, const uint256& sighash) const
{
CPubKey rPubKey;
if(!rPubKey.RecoverCompact(sighash,vchSig))
return false;
if(rPubKey == pubkey)
return true;
if(!rPubKey.Compress())
return false;
return rPubKey == pubkey;
}
void SignVerifyMessageDialog::on_verifyMessageButton_VM_clicked()
{
CBitcoinAddress addr(ui->addressIn_VM->text().toStdString());
if (!addr.IsValid())
{
ui->addressIn_VM->setValid(false);
ui->statusLabel_VM->setStyleSheet("QLabel { color: red; }");
ui->statusLabel_VM->setText(tr("The entered address is invalid.") + QString(" ") + tr("Please check the address and try again."));
return;
}
CKeyID keyID;
if (!addr.GetKeyID(keyID))
{
ui->addressIn_VM->setValid(false);
ui->statusLabel_VM->setStyleSheet("QLabel { color: red; }");
ui->statusLabel_VM->setText(tr("The entered address does not refer to a key.") + QString(" ") + tr("Please check the address and try again."));
return;
}
bool fInvalid = false;
std::vector<unsigned char> vchSig = DecodeBase64(ui->signatureIn_VM->text().toStdString().c_str(), &fInvalid);
if (fInvalid)
{
ui->signatureIn_VM->setValid(false);
ui->statusLabel_VM->setStyleSheet("QLabel { color: red; }");
ui->statusLabel_VM->setText(tr("The signature could not be decoded.") + QString(" ") + tr("Please check the signature and try again."));
return;
}
CDataStream ss(SER_GETHASH, 0);
ss << strMessageMagic;
ss << ui->messageIn_VM->document()->toPlainText().toStdString();
CPubKey pubkey;
if (!pubkey.RecoverCompact(Hash(ss.begin(), ss.end()), vchSig))
{
ui->signatureIn_VM->setValid(false);
ui->statusLabel_VM->setStyleSheet("QLabel { color: red; }");
ui->statusLabel_VM->setText(tr("The signature did not match the message digest.") + QString(" ") + tr("Please check the signature and try again."));
return;
}
if (!(CBitcoinAddress(pubkey.GetID()) == addr))
{
ui->statusLabel_VM->setStyleSheet("QLabel { color: red; }");
ui->statusLabel_VM->setText(QString("<nobr>") + tr("Message verification failed.") + QString("</nobr>"));
return;
}
ui->statusLabel_VM->setStyleSheet("QLabel { color: green; }");
ui->statusLabel_VM->setText(QString("<nobr>") + tr("Message verified.") + QString("</nobr>"));
}
Value verifymessage(const Array& params, bool fHelp)
{
if (fHelp || params.size() != 3)
throw runtime_error(
"verifymessage <username> <signature> <message>\n"
"Verify a signed message");
string strUsername = params[0].get_str();
string strSign = params[1].get_str();
string strMessage = params[2].get_str();
CPubKey pubkey;
{
CKeyID keyID;
if( pwalletMain->GetKeyIdFromUsername(strUsername, keyID) ) {
if( !pwalletMain->GetPubKey(keyID, pubkey) )
throw JSONRPCError(RPC_WALLET_INVALID_ACCOUNT_NAME, "Error: failed to read pubkey from wallet");
}
}
if( !pubkey.IsValid() ) {
CTransaction txOut;
uint256 hashBlock;
if( !GetTransaction(strUsername, txOut, hashBlock) )
throw JSONRPCError(RPC_WALLET_INVALID_ACCOUNT_NAME, "Error: this username does not exist in tx database");
std::vector< std::vector<unsigned char> > vData;
if( !txOut.pubKey.ExtractPushData(vData) || vData.size() < 1 )
throw JSONRPCError(RPC_INTERNAL_ERROR, "Error: error extracting pubkey from tx");
pubkey = CPubKey(vData[0]);
if( !pubkey.IsValid() )
throw JSONRPCError(RPC_INTERNAL_ERROR, "Error: invalid pubkey data from tx");
}
bool fInvalid = false;
vector<unsigned char> vchSig = DecodeBase64(strSign.c_str(), &fInvalid);
if (fInvalid)
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Malformed base64 encoding");
CHashWriter ss(SER_GETHASH, 0);
ss << strMessageMagic;
ss << strMessage;
CPubKey pubkeyRec;
if (!pubkeyRec.RecoverCompact(ss.GetHash(), vchSig))
return false;
return (pubkeyRec.GetID() == pubkey.GetID());
}
bool TransactionSignatureChecker::RecoverPubKey(const std::vector<unsigned char>& vchSigIn, std::vector<unsigned char>& vchPubKey, const CScript& scriptCode) const
{
int nHashType = vchSigIn.back();
uint256 sighash = SignatureHash(scriptCode, *txTo, nIn, nHashType);
CPubKey rPubKey;
std::vector<unsigned char> vchSigCompact;
vchSigCompact = vchSigIn;
vchSigCompact.resize(65);
if(!rPubKey.RecoverCompact(sighash,vchSigCompact))
return false;
vchPubKey = rPubKey.GetChar();
return true;
}
bool CHashSigner::VerifyHash(const uint256& hash, const CPubKey pubkey, 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() != pubkey.GetID()) {
strErrorRet = strprintf("Keys don't match: pubkey=%s, pubkeyFromSig=%s, hash=%s, vchSig=%s",
pubkey.GetID().ToString(), pubkeyFromSig.GetID().ToString(), hash.ToString(),
EncodeBase64(&vchSig[0], vchSig.size()));
return false;
}
return true;
}
