Function signmessage

src/rpc/rpcwallet.cpp:236–279

}

Value signmessage(const Array& params, bool fHelp) {
    if (fHelp || params.size() != 2) {
        throw runtime_error("signmessage \"signee\" \"message\"\n"
            "\nSign a message by the private key of the given address"
            + HelpRequiringPassphrase() + "\n"
            "\nArguments:\n"
            "1. \"signee\"          (string, required) The coin address associated with the private key to sign.\n"
            "2. \"message\"         (string, required) The message to create a signature of.\n"
            "\nResult:\n"
            "\"signature\"          (string) The signature of the message encoded in base 64\n"
            "\nExamples:\n"
            "\nUnlock the wallet for 30 seconds\n"
            + HelpExampleCli("walletpassphrase", "\"mypassphrase\" 30") +
            "\nCreate the signature\n"
            + HelpExampleCli("signmessage", R"("wLKf2NqwtHk3BfzK5wMDfbKYN1SC3weyR4" "my message")") +
            "\nVerify the signature\n"
            + HelpExampleCli("verifymessage", R"("wLKf2NqwtHk3BfzK5wMDfbKYN1SC3weyR4" "signature" "my message")") +
            "\nAs json rpc\n"
            + HelpExampleRpc("signmessage", R"("wLKf2NqwtHk3BfzK5wMDfbKYN1SC3weyR4", "my message")")
        );
    }

    EnsureWalletIsUnlocked();

    const CKeyID &keyId = RPC_PARAM::GetKeyId(params[0]);
    string strMessage = params[1].get_str();

    if (keyId.IsEmpty())
        throw JSONRPCError(RPC_TYPE_ERROR, "Invalid address");

    CKey key;
    if (!pWalletMain->GetKey(keyId, key))
        throw JSONRPCError(RPC_WALLET_ERROR, "Private key not available");

    CHashWriter ss(SER_GETHASH, 0);
    ss << strMessageMagic;
    ss << strMessage;

    vector<uint8_t> vchSig;
    if (!key.SignCompact(ss.GetHash(), vchSig))
        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Sign failed");

    return EncodeBase64(&vchSig[0], vchSig.size());
}

Value submitsendtx(const Array& params, bool fHelp) {
    if (fHelp || (params.size() < 3 && params.size() > 5))