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       1                 :            : // Copyright (c) 2011-2022 The Bitcoin Core developers
       2                 :            : // Distributed under the MIT software license, see the accompanying
       3                 :            : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       4                 :            : 
       5                 :            : #include <key_io.h>
       6                 :            : #include <rpc/util.h>
       7                 :            : #include <util/message.h>
       8                 :            : #include <wallet/rpc/util.h>
       9                 :            : #include <wallet/wallet.h>
      10                 :            : 
      11                 :            : #include <univalue.h>
      12                 :            : 
      13                 :            : namespace wallet {
      14                 :          0 : RPCHelpMan signmessage()
      15                 :            : {
      16 [ #  # ][ #  # ]:          0 :     return RPCHelpMan{"signmessage",
                 [ #  # ]
      17         [ #  # ]:          0 :         "\nSign a message with the private key of an address" +
      18                 :            :           HELP_REQUIRING_PASSPHRASE,
      19         [ #  # ]:          0 :         {
      20 [ #  # ][ #  # ]:          0 :             {"address", RPCArg::Type::STR, RPCArg::Optional::NO, "The bitcoin address to use for the private key."},
                 [ #  # ]
      21 [ #  # ][ #  # ]:          0 :             {"message", RPCArg::Type::STR, RPCArg::Optional::NO, "The message to create a signature of."},
                 [ #  # ]
      22                 :            :         },
      23 [ #  # ][ #  # ]:          0 :         RPCResult{
      24 [ #  # ][ #  # ]:          0 :             RPCResult::Type::STR, "signature", "The signature of the message encoded in base 64"
      25                 :            :         },
      26         [ #  # ]:          0 :         RPCExamples{
      27                 :          2 :             "\nUnlock the wallet for 30 seconds\n"
      28 [ +  - ][ +  - ]:          6 :             + HelpExampleCli("walletpassphrase", "\"mypassphrase\" 30") +
         [ +  - ][ -  + ]
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
      29 [ +  - ][ +  - ]:          2 :             "\nCreate the signature\n"
                 [ +  - ]
      30 [ +  - ][ +  - ]:          2 :             + HelpExampleCli("signmessage", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\" \"my message\"") +
         [ +  - ][ #  # ]
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
      31                 :            :             "\nVerify the signature\n"
      32 [ #  # ][ #  # ]:          0 :             + HelpExampleCli("verifymessage", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\" \"signature\" \"my message\"") +
         [ #  # ][ #  # ]
                 [ #  # ]
      33                 :            :             "\nAs a JSON-RPC call\n"
      34 [ #  # ][ #  # ]:          0 :             + HelpExampleRpc("signmessage", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\", \"my message\"")
         [ #  # ][ #  # ]
      35                 :            :         },
      36                 :          0 :         [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
      37                 :            :         {
      38                 :          0 :             const std::shared_ptr<const CWallet> pwallet = GetWalletForJSONRPCRequest(request);
      39 [ #  # ][ #  # ]:          0 :             if (!pwallet) return UniValue::VNULL;
      40                 :            : 
      41 [ #  # ][ #  # ]:          0 :             LOCK(pwallet->cs_wallet);
      42                 :            : 
      43         [ #  # ]:          0 :             EnsureWalletIsUnlocked(*pwallet);
      44                 :            : 
      45 [ #  # ][ #  # ]:          0 :             std::string strAddress = request.params[0].get_str();
                 [ #  # ]
      46 [ #  # ][ #  # ]:          0 :             std::string strMessage = request.params[1].get_str();
                 [ #  # ]
      47                 :            : 
      48         [ #  # ]:          0 :             CTxDestination dest = DecodeDestination(strAddress);
      49 [ #  # ][ #  # ]:          0 :             if (!IsValidDestination(dest)) {
      50 [ #  # ][ #  # ]:          0 :                 throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid address");
                 [ #  # ]
      51                 :            :             }
      52                 :            : 
      53                 :          0 :             const PKHash* pkhash = std::get_if<PKHash>(&dest);
      54         [ #  # ]:          0 :             if (!pkhash) {
      55 [ #  # ][ #  # ]:          0 :                 throw JSONRPCError(RPC_TYPE_ERROR, "Address does not refer to key");
                 [ #  # ]
      56                 :            :             }
      57                 :            : 
      58                 :          0 :             std::string signature;
      59         [ #  # ]:          0 :             SigningResult err = pwallet->SignMessage(strMessage, *pkhash, signature);
      60         [ #  # ]:          0 :             if (err == SigningResult::SIGNING_FAILED) {
      61 [ #  # ][ #  # ]:          0 :                 throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, SigningResultString(err));
                 [ #  # ]
      62         [ #  # ]:          0 :             } else if (err != SigningResult::OK) {
      63 [ #  # ][ #  # ]:          0 :                 throw JSONRPCError(RPC_WALLET_ERROR, SigningResultString(err));
                 [ #  # ]
      64                 :            :             }
      65                 :            : 
      66         [ #  # ]:          0 :             return signature;
      67                 :          0 :         },
      68                 :            :     };
      69                 :          0 : }
      70                 :            : } // namespace wallet