From 16646cd1afb50399fbe867f1e9590e58c6f1a792 Mon Sep 17 00:00:00 2001
From: MASM fan <masmfan@gmail.com>
Date: Fri, 1 Aug 2014 00:01:30 +0400
Subject: [PATCH] Add createmultisig RPC

Same as addmultisigaddress, but returns JSON object instead of addition of address into the wallet.
---
 src/bitcoinrpc.cpp        |    3 ++
 src/bitcoinrpc.h          |    1 +
 src/rpcrawtransaction.cpp |   70 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 74 insertions(+), 0 deletions(-)

diff --git a/src/bitcoinrpc.cpp b/src/bitcoinrpc.cpp
index b8275cc..d93cab8 100644
--- a/src/bitcoinrpc.cpp
+++ b/src/bitcoinrpc.cpp
@@ -295,6 +295,7 @@ static const CRPCCommand vRPCCommands[] =
     { "getrawtransaction",      &getrawtransaction,      false,  false },
     { "createrawtransaction",   &createrawtransaction,   false,  false },
     { "decoderawtransaction",   &decoderawtransaction,   false,  false },
+    { "createmultisig",         &createmultisig,         false,  false },
     { "decodescript",           &decodescript,           false,  false },
     { "signrawtransaction",     &signrawtransaction,     false,  false },
     { "sendrawtransaction",     &sendrawtransaction,     false,  false },
@@ -1225,6 +1226,8 @@ Array RPCConvertValues(const std::string &strMethod, const std::vector<std::stri
     if (strMethod == "getrawtransaction"      && n > 1) ConvertTo<boost::int64_t>(params[1]);
     if (strMethod == "createrawtransaction"   && n > 0) ConvertTo<Array>(params[0]);
     if (strMethod == "createrawtransaction"   && n > 1) ConvertTo<Object>(params[1]);
+    if (strMethod == "createmultisig"         && n > 0) ConvertTo<boost::int64_t>(params[0]);
+    if (strMethod == "createmultisig"         && n > 1) ConvertTo<Array>(params[1]);
     if (strMethod == "signrawtransaction"     && n > 1) ConvertTo<Array>(params[1], true);
     if (strMethod == "signrawtransaction"     && n > 2) ConvertTo<Array>(params[2], true);
     if (strMethod == "keypoolrefill"          && n > 0) ConvertTo<boost::int64_t>(params[0]);
diff --git a/src/bitcoinrpc.h b/src/bitcoinrpc.h
index 78d4608..102ea4b 100644
--- a/src/bitcoinrpc.h
+++ b/src/bitcoinrpc.h
@@ -202,6 +202,7 @@ extern json_spirit::Value getrawtransaction(const json_spirit::Array& params, bo
 extern json_spirit::Value listunspent(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value createrawtransaction(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value decoderawtransaction(const json_spirit::Array& params, bool fHelp);
+extern json_spirit::Value createmultisig(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value decodescript(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value signrawtransaction(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value sendrawtransaction(const json_spirit::Array& params, bool fHelp);
diff --git a/src/rpcrawtransaction.cpp b/src/rpcrawtransaction.cpp
index 9b8eeab..e34b486 100644
--- a/src/rpcrawtransaction.cpp
+++ b/src/rpcrawtransaction.cpp
@@ -589,3 +589,73 @@ Value sendrawtransaction(const Array& params, bool fHelp)
 
     return hashTx.GetHex();
 }
+
+Value createmultisig(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() < 2 || params.size() > 3)
+    {
+        string msg = "createmultisig <nrequired> <'[\"key\",\"key\"]'>\n"
+            "\nCreates a multi-signature address with n signature of m keys required.\n"
+            "It returns a json object with the address and redeemScript.";
+        throw runtime_error(msg);
+    }
+
+    int nRequired = params[0].get_int();
+    const Array& keys = params[1].get_array();
+    string strAccount;
+
+    // Gather public keys
+    if (nRequired < 1)
+        throw runtime_error("a multisignature address must require at least one key to redeem");
+    if ((int)keys.size() < nRequired)
+        throw runtime_error(
+            strprintf("not enough keys supplied "
+                      "(got %"PRIszu" keys, but need at least %d to redeem)", keys.size(), nRequired));
+    std::vector<CKey> pubkeys;
+    pubkeys.resize(keys.size());
+    for (unsigned int i = 0; i < keys.size(); i++)
+    {
+        const std::string& ks = keys[i].get_str();
+
+        // Case 1: Bitcoin address and we have full public key:
+        CBitcoinAddress address(ks);
+        if (address.IsValid())
+        {
+            CKeyID keyID;
+            if (!address.GetKeyID(keyID))
+                throw runtime_error(
+                    strprintf("%s does not refer to a key",ks.c_str()));
+            CPubKey vchPubKey;
+            if (!pwalletMain->GetPubKey(keyID, vchPubKey))
+                throw runtime_error(
+                    strprintf("no full public key for address %s",ks.c_str()));
+            if (!vchPubKey.IsValid() || !pubkeys[i].SetPubKey(vchPubKey))
+                throw runtime_error(" Invalid public key: "+ks);
+        }
+
+        // Case 2: hex public key
+        else if (IsHex(ks))
+        {
+            CPubKey vchPubKey(ParseHex(ks));
+            if (!vchPubKey.IsValid() || !pubkeys[i].SetPubKey(vchPubKey))
+                throw runtime_error(" Invalid public key: "+ks);
+        }
+        else
+        {
+            throw runtime_error(" Invalid public key: "+ks);
+        }
+    }
+
+    // Construct using pay-to-script-hash:
+    CScript inner;
+    inner.SetMultisig(nRequired, pubkeys);
+
+    CScriptID innerID = inner.GetID();
+    CBitcoinAddress address(innerID);
+
+    Object result;
+    result.push_back(Pair("address", address.ToString()));
+    result.push_back(Pair("redeemScript", HexStr(inner.begin(), inner.end())));
+
+    return result;
+}
-- 
1.7.1