rpc: fix {sign,message}verify RPC errors for invalid address/signature

src/rpc/misc.cpp

@@ -300,11 +300,11 @@ static RPCHelpMan verifymessage()
 
     switch (MessageVerify(strAddress, strSign, strMessage)) {
     case MessageVerificationResult::ERR_INVALID_ADDRESS:
-        throw JSONRPCError(RPC_TYPE_ERROR, "Invalid address");
+        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid address");
     case MessageVerificationResult::ERR_ADDRESS_NO_KEY:
         throw JSONRPCError(RPC_TYPE_ERROR, "Address does not refer to key");
     case MessageVerificationResult::ERR_MALFORMED_SIGNATURE:
-        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Malformed base64 encoding");
+        throw JSONRPCError(RPC_TYPE_ERROR, "Malformed base64 encoding");
     case MessageVerificationResult::ERR_PUBKEY_NOT_RECOVERED:
     case MessageVerificationResult::ERR_NOT_SIGNED:
         return false;

src/wallet/rpcwallet.cpp

@@ -602,7 +602,7 @@ static UniValue signmessage(const JSONRPCRequest& request)
 
     CTxDestination dest = DecodeDestination(strAddress);
     if (!IsValidDestination(dest)) {
-        throw JSONRPCError(RPC_TYPE_ERROR, "Invalid address");
+        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid address");
     }
 
     const PKHash *pkhash = boost::get<PKHash>(&dest);