RPC: add getrawchangeaddress, for raw transaction change destinations

src/bitcoinrpc.cpp

@@ -208,6 +208,7 @@ static const CRPCCommand vRPCCommands[] =
     { "getmininginfo",          &getmininginfo,          true,      false },
     { "getnewaddress",          &getnewaddress,          true,      false },
     { "getaccountaddress",      &getaccountaddress,      true,      false },
+    { "getrawchangeaddress",    &getrawchangeaddress,    true,      false },
     { "setaccount",             &setaccount,             true,      false },
     { "getaccount",             &getaccount,             false,     false },
     { "getaddressesbyaccount",  &getaddressesbyaccount,  true,      false },

src/bitcoinrpc.h

@@ -161,6 +161,7 @@ extern json_spirit::Value submitblock(const json_spirit::Array& params, bool fHe
 
 extern json_spirit::Value getnewaddress(const json_spirit::Array& params, bool fHelp); // in rpcwallet.cpp
 extern json_spirit::Value getaccountaddress(const json_spirit::Array& params, bool fHelp);
+extern json_spirit::Value getrawchangeaddress(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value setaccount(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value getaccount(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value getaddressesbyaccount(const json_spirit::Array& params, bool fHelp);

src/rpcwallet.cpp

@@ -176,6 +176,29 @@ Value getaccountaddress(const Array& params, bool fHelp)
 }
 
 
+Value getrawchangeaddress(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() > 1)
+        throw runtime_error(
+            "getrawchangeaddress\n"
+            "Returns a new Bitcoin address, for receiving change.  "
+            "This is for use with raw transactions, NOT normal use.");
+
+    if (!pwalletMain->IsLocked())
+        pwalletMain->TopUpKeyPool();
+
+    CReserveKey reservekey(pwalletMain);
+    CPubKey vchPubKey;
+    if (!reservekey.GetReservedKey(vchPubKey))
+        throw JSONRPCError(RPC_WALLET_ERROR, "Error: Unable to obtain key for change");
+
+    reservekey.KeepKey();
+
+    CKeyID keyID = vchPubKey.GetID();
+
+    return CBitcoinAddress(keyID).ToString();
+}
+
 
 Value setaccount(const Array& params, bool fHelp)
 {