Key import and export

Introduces two new RPC calls:
* dumpprivkey: retrieve the private key corresponding to an address
* importprivkey: add a private key to your wallet

The private key format is analoguous to the address format. It is
a 51-character base58-encoded string, that includes a version number
and a checksum.

Includes patch by mhanne:
* add optional account parameter for importprivkey, if omitted use default

1 files changed, 101 insertions, 0 deletions

diff --git a/src/rpcdump.cpp b/src/rpcdump.cpp
new file mode 100644
index 0000000000..f3978fbce8
--- /dev/null
+++ b/src/rpcdump.cpp
@@ -0,0 +1,101 @@
+// Copyright (c) 2011 Bitcoin Developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+
+#include "headers.h"
+#include "init.h" // for pwalletMain
+#include "bitcoinrpc.h"
+
+// #include <boost/asio.hpp>
+// #include <boost/iostreams/concepts.hpp>
+// #include <boost/iostreams/stream.hpp>
+#include <boost/lexical_cast.hpp>
+// #ifdef USE_SSL
+// #include <boost/asio/ssl.hpp> 
+// typedef boost::asio::ssl::stream<boost::asio::ip::tcp::socket> SSLStream;
+// #endif
+// #include <boost/xpressive/xpressive_dynamic.hpp>
+#include "json/json_spirit_reader_template.h"
+#include "json/json_spirit_writer_template.h"
+#include "json/json_spirit_utils.h"
+
+#define printf OutputDebugStringF
+
+// using namespace boost::asio;
+using namespace json_spirit;
+using namespace std;
+
+extern Object JSONRPCError(int code, const string& message);
+
+class CTxDump
+{
+public:
+    CBlockIndex *pindex;
+    int64 nValue;
+    bool fSpent;
+    CWalletTx* ptx;
+    int nOut;
+    CTxDump(CWalletTx* ptx = NULL, int nOut = -1)
+    {
+        pindex = NULL;
+        nValue = 0;
+        fSpent = false;
+        this->ptx = ptx;
+        this->nOut = nOut;
+    }
+};
+
+Value importprivkey(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() < 1 || params.size() > 2)
+        throw runtime_error(
+            "importprivkey <bitcoinprivkey> [label]\n"
+            "Adds a private key (as returned by dumpprivkey) to your wallet.");
+
+    string strSecret = params[0].get_str();
+    string strLabel = "";
+    if (params.size() > 1)
+        strLabel = params[1].get_str();
+    CBitcoinSecret vchSecret;
+    bool fGood = vchSecret.SetString(strSecret);
+
+    if (!fGood) throw JSONRPCError(-5,"Invalid private key");
+
+    CKey key;
+    key.SetSecret(vchSecret.GetSecret());
+    CBitcoinAddress vchAddress = CBitcoinAddress(key.GetPubKey());
+
+    CRITICAL_BLOCK(cs_main)
+    CRITICAL_BLOCK(pwalletMain->cs_wallet)
+    {
+        pwalletMain->MarkDirty();
+        pwalletMain->SetAddressBookName(vchAddress, strLabel);
+
+        if (!pwalletMain->AddKey(key))
+            throw JSONRPCError(-4,"Error adding key to wallet");
+
+        pwalletMain->ScanForWalletTransactions(pindexGenesisBlock, true);
+        pwalletMain->ReacceptWalletTransactions();
+    }
+
+    MainFrameRepaint();
+
+    return Value::null;
+}
+
+Value dumpprivkey(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() != 1)
+        throw runtime_error(
+            "dumpprivkey <bitcoinaddress>\n"
+            "Reveals the private key corresponding to <bitcoinaddress>.");
+
+    string strAddress = params[0].get_str();
+    CBitcoinAddress address;
+    if (!address.SetString(strAddress))
+        throw JSONRPCError(-5, "Invalid bitcoin address");
+    CSecret vchSecret;
+    if (!pwalletMain->GetSecret(address, vchSecret))
+        throw JSONRPCError(-4,"Private key for address " + strAddress + " is not known");
+    return CBitcoinSecret(vchSecret).ToString();
+}