[Dev] Documenting Feathercoin Specific Software settings - Part 1

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/f4003712b2147b515c073d1a92985161d667cae9

rpcclient.cpp

rpcclient.cpp contains a number of scrypt interface change related settings such as Methods. FTC should maintain a separate file, or such as this could be over writen by changes at head (and pass auto build test).

+    if (strMethod == "setgenerate"            && n > 1) ConvertTo<int64_t>(params[1]);
-    if (strMethod == "getnetworkhashps"       && n > 0) ConvertTo<boost::int64_t>(params[0]);
+    if (strMethod == "getnetworkhashps"       && n > 0) ConvertTo<int64_t>(params[0]);
-    if (strMethod == "getnetworkhashps"       && n > 1) ConvertTo<boost::int64_t>(params[1]);
+    if (strMethod == "getnetworkhashps"       && n > 1) ConvertTo<int64_t>(params[1]);  

Note : Further similar Methods / see debug console, are defined .

    -    strUsage += "  -conf=<file>           " + _("Specify configuration file (default: bitcoin.conf)") + "\n";
  +   strUsage += "  -conf=<file>           " + _("Specify configuration file (default: feathercoin.conf)") + "\n";

Name change to .conf file.

 -    strUsage += "  -rpcport=<port>        " + _("Connect to JSON-RPC on <port> (default: 8332 or testnet: 18332)") + "\n";
+    strUsage += "  -rpcport=<port>        " + _("Connect to JSON-RPC on <port> (default: 9337 or testnet: 19337)") + "\n";

Setting Feathercoin mining / rpc ports.

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/d58d75a44a95b6b06147bd7f1419c36157d184fa

rpcserver.cpp

A short file with a number of settings changes. Consider build change to FTC version of file when move to head…

 +  static std::vector< boost::shared_ptr<ip::tcp::acceptor> > rpc_acceptors;

added static for scrypt interface.

   +            "\nStop Feathercoin server.");

   +    return "Feathercoin server stopping";

Update close down messages to say Feathercoin.

      /* P2P networking */
+    { "getnetworkinfo",         &getnetworkinfo,         true,      false,      false },

Added getnetworkinfo for scrypt interface.

     /* Block chain and UTXO */
+    { "getblockchaininfo",      &getblockchaininfo,      true,      false,      false },

Added getblockchaininfo for scrypt interface.

-    AcceptedConnection* conn,
+    boost::shared_ptr< AcceptedConnection > conn,

-    AcceptedConnectionImpl<Protocol>* conn = new AcceptedConnectionImpl<Protocol>(acceptor->get_io_service(), context, fUseSSL);
+    boost::shared_ptr< AcceptedConnectionImpl<Protocol> > conn(new AcceptedConnectionImpl<Protocol>(acceptor->get_io_service(), context, fUseSSL));

Updated AcceptedConnection for scrypt interface.

  -                boost::asio::placeholders::error));
 +                _1));

Updated Boost error to function?

  -       AcceptedConnection* conn,
 +      boost::shared_ptr< AcceptedConnection > conn,

Updates to RPCAcceptHandler for the scrypt interface.

 // Immediately start accepting new connections, except when we're cancelled or our socket is closed.
  if (error != asio::error::operation_aborted && acceptor->is_open())
           RPCListen(acceptor, context, fUseSSL);
    
 -   AcceptedConnectionImpl<ip::tcp>* tcp_conn = dynamic_cast< AcceptedConnectionImpl<ip::tcp>* >(conn);
+    AcceptedConnectionImpl<ip::tcp>* tcp_conn = dynamic_cast< AcceptedConnectionImpl<ip::tcp>* >(conn.get());

Updates to connection error interface.

       if (error)
 {
       -     delete conn;
+        // TODO: Actually handle errors  
 +      LogPrintf("%s: Error: %s\n", __func__, error.message());
    }

Updates to connection error interface.

 -     delete conn;
 +    conn->close();
 -     ServiceConnection(conn);
 +     ServiceConnection(conn.get());
       conn->close();

Further updates to connections handling.

 -     string strWhatAmI = "To use bitcoind";
 +     string strWhatAmI = "To use feathercoind";

strWhatAm updated to read feathercoin

 -     "rpcuser=bitcoinrpc\n"
+     "rpcuser=feathercoinrpc\n"

rpcuser name change to FTC

  -    "for example: alertnotify=echo %%s | mail -s \"Bitcoin Alert\" admin@foo.com\n"),
 +    "for example: alertnotify=echo %%s | mail -s \"Feathercoin Alert\" admin@foo.com\n"),

name change to FTC, alert messages from admin.

-    boost::shared_ptr<ip::tcp::acceptor> acceptor(new ip::tcp::acceptor(*rpc_io_service));

Remove Bitcoin Boost code. Was this moved?

 +   rpc_acceptors.push_back(acceptor);

extra line added scrypt acceptance interface.

  -    acceptor.reset(new ip::tcp::acceptor(*rpc_io_service));
 +    boost::shared_ptr<ip::tcp::acceptor> acceptor(new ip::tcp::acceptor(*rpc_io_service));

connection interface change to scrypt

 +    rpc_acceptors.push_back(acceptor);

additional rpc inspector for scrypt connection interface.

 +      // First, cancel all timers and acceptors
 +      // This is not done automatically by ->stop(), and in some cases the destructor of
 +      // asio::io_service can hang if this is skipped.
 +      boost::system::error_code ec;
 +      BOOST_FOREACH(const boost::shared_ptr<ip::tcp::acceptor> &acceptor, rpc_acceptors)
 +      {
 +          acceptor->cancel(ec);
 +          if (ec)
 +              LogPrintf("%s: Warning: %s when cancelling acceptor", __func__, ec.message());
 +      }
 +      rpc_acceptors.clear();
 +      BOOST_FOREACH(const PAIRTYPE(std::string, boost::shared_ptr<deadline_timer>) &timer, deadlineTimers)
 +      {
 +          timer.second->cancel(ec);
 +          if (ec)
 +              LogPrintf("%s: Warning: %s when cancelling timer", __func__, ec.message());

Main code of rpc interface change for scrypt.

 -     return "> bitcoin-cli " + methodname + " " + args + "\n";
+     return "> feathercoin-cli " + methodname + " " + args + "\n";

Name change for the feathercoin-cli (replaces feathercoind

   -    "\"method\": \"" + methodname + "\", \"params\": [" + args + "] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/\n";
  +     "\"method\": \"" + methodname + "\", \"params\": [" + args + "] }' -H 'content-type: text/plain;' http://127.0.0.1:9337/\n";

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/d58d75a44a95b6b06147bd7f1419c36157d184fa

checkpoints.cpp

Probably should be maintained as FTC specific file. Contains dev included FTC checkpoints, or “know blocks”.

    +            (     1, uint256("0xfdbe99b90c90bae7505796461471d89ae8388ab953997aa06a355bbda8d915cb"))

Example of FTC checkpoint

 static const CCheckpointData data = {
    &mapCheckpoints,
 -      1389047471, // * UNIX timestamp of last checkpoint block
 +     1372166807, // * UNIX timestamp of last checkpoint block
 -      30549816,   // * total number of transactions between genesis and last checkpoint
 +      257285,    // * total number of transactions between genesis and last checkpoint
            //   (the tx=... number in the SetBestChain debug.log lines)
 -      60000.0     // * estimated number of transactions per day after checkpoint
 +     3450.0     // * estimated number of transactions per day after checkpoint

checkpoint settings customization.

  +    if (TestNet()) return true; // Testnet has no checkpoints

 +     if (TestNet()) return NULL; // Testnet has no checkpoints

Switch off checkpoints for testnet

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/c86c18168555458aae830a4baa487184324adae3

util.cpp

Short file consisting of mostly feathercoin / scrypt specific settings. Consider maintaining seperate FTC file integrated at build going forward to head.

+ #include <boost/date_time/posix_time/posix_time.hpp>

Include Boost

 -  void ParseString(const string& str, char c, vector<string>& v)
 -  {
 -      if (str.empty())
 -          return;
 -      string::size_type i1 = 0;
 -      string::size_type i2;
 -      while (true)
 -      {
 -          i2 = str.find(c, i1);
 -          if (i2 == str.npos)
 -          {
 -              v.push_back(str.substr(i1));
 -              return;
 -          }
 -          v.push_back(str.substr(i1, i2     -  i1));
 -          i1 = i2+1;
 -      }

Remove Bitcoin ParseString() function.

 -  const char* pszModule = "bitcoin";
 +  const char* pszModule = "feathercoin"

Name change to Feathercoin.

 +    // Windows < Vista: C:\Documents and Settings\Username\Application Data\Feathercoin
 +    // Windows >= Vista: C:\Users\Username\AppData\Roaming\Feathercoin
 +    // Mac: ~/Library/Application Support/Feathercoin

Name change directories.

+    return GetSpecialFolderPath(CSIDL_APPDATA) / "Feathercoin";

Name change application directories.

  +    return pathRet / "Feathercoin";

Path change

 +    return pathRet / ".feathercoin";

Path update name

    +    boost::filesystem::path pathConfigFile(GetArg("-conf", "feathercoin.conf"));

Change Boost reference to feathercoin.

  +    return; // No feathercoin.conf file is OK

name change in comments?

  +   boost::filesystem::path pathPidFile(GetArg("-pid", "feathercoind.pid"));

name change feathercoind

 +  void SetupEnvironment()
 +  {
 +      #ifndef WIN32
 +      try
 +      {
 +  	#if BOOST_FILESYSTEM_VERSION == 3
 +              boost::filesystem::path::codecvt(); // Raises runtime error if current locale is invalid
 +  	#else				          // boost filesystem v2
 +              std::locale();                      // Raises runtime error if current locale is invalid
 +  	#endif
 +      } catch(std::runtime_error &e)
 +      {
 +          setenv("LC_ALL", "C", 1); // Force C locale
 +      }
 +      #endif
 +  }
 +  
 +  std::string DateTimeStrFormat(const char* pszFormat, int64_t nTime)
 +  {
 +      // std::locale takes ownership of the pointer
 +      std::locale loc(std::locale::classic(), new boost::posix_time::time_facet(pszFormat));
 +      std::stringstream ss;
 +      ss.imbue(loc);
 +      ss << boost::posix_time::from_time_t(nTime);
 +      return ss.str();;

Include SetupEnvironment()

 +      // First, cancel all timers and acceptors
 +      // This is not done automatically by ->stop(), and in some cases the destructor of
 +      // asio::io_service can hang if this is skipped.
 +      boost::system::error_code ec;
 +      BOOST_FOREACH(const boost::shared_ptr<ip::tcp::acceptor> &acceptor, rpc_acceptors)
 +      {
 +          acceptor->cancel(ec);
 +          if (ec)
 +              LogPrintf("%s: Warning: %s when cancelling acceptor", __func__, ec.message());
 +      }
 +      rpc_acceptors.clear();
 +      BOOST_FOREACH(const PAIRTYPE(std::string, boost::shared_ptr<deadline_timer>) &timer, deadlineTimers)
 +      {
 +          timer.second->cancel(ec);
 +          if (ec)
 +              LogPrintf("%s: Warning: %s when cancelling timer", __func__, ec.message());

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/da79a745dcd1b50245d832cf52dfb5a517981e7c

util.h

Short file consisting of mostly feathercoin / scrypt specific settings. Consider maintaining separate FTC file integrated at build going forward to head.

-  /* Format characters for (s)size_t, ptrdiff_t.
-   *
-   * Define these as empty as the tinyformat      -  based formatting system is
-   * type      -  safe, no special format characters are needed to specify sizes.
-   */
-  #define PRIszx    "x"
-  #define PRIszu    "u"
-  #define PRIszd    "d"
-  #define PRIpdx    "x"
-  #define PRIpdu    "u"
-  #define PRIpdd    "d"

Code defining Priszx is removed.

 +   void SetupEnvironment();

SetupEnvironment function is included.

- void ParseString(const std::string& str, char c, std::vector<std::string>& v);

Code removed.

+ std::string DateTimeStrFormat(const char* pszFormat, int64_t nTime);

Time format function included.

 - inline std::string DateTimeStrFormat(const char* pszFormat, int64_t nTime)
 -{
 -    time_t n = nTime;
 -    struct tm* ptmTime = gmtime(&n);
 -    char pszTime[200];
 -    strftime(pszTime, sizeof(pszTime), pszFormat, ptmTime);
 -    return pszTime;
 -}

Bitcoin time definition code is removed.

 +    std::string s = strprintf("feathercoin-%s", name);

Name change to Feathercoin. Bitcoin code removed.

+    std::string s = strprintf("feathercoin-%s", name);

Name change to Feathercoin. Bitcoin code removed.

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/43997d510b900f6eeca0d82545bf902f3b104349

init.cpp

Init.cpp is the main program loop?. Short file consisting of mostly feathercoin / scrypt specific settings. Consider maintaining separate FTC file integrated at build going forward to head.

 + // Copyright (c)      2014 The Feathercoin developers

Copyright needs update

+ #include "key.h"

+ #include <stdio.h>

Extra files included,

RenameThread("feathercoin-shutoff");

Thread name change to Feathercoin. Bitcoin line removed.

+  strUsage += "  -conf=<file>           " + _("Specify configuration file (default: feathercoin.conf)") + "\n";

Name change to Feathercoin. Bitcoin code removed.

-    strUsage += "  -keypool=<n>           " + _("Set key pool size to <n> (default: 100)") + "\n";

Remove Bitcoin keypool size settings.

 +    strUsage += "  -maxorphanblocks=<n>   " + strprintf(_("Keep at most <n> unconnectable blocks in memory (default: %u)"), DEFAULT_MAX_ORPHAN_BLOCKS) + "\n";
 +    strUsage += "  -maxorphantx=<n>       " + strprintf(_("Keep at most <n> unconnectable transactions in memory (default: %u)"), DEFAULT_MAX_ORPHAN_TRANSACTIONS) + "\n";

Include the Scrypt interface for orphans.

+    strUsage += "  -pid=<file>            " + _("Specify pid file (default: feathercoind.pid)") + "\n";

Name change to Feathercoin. Bitcoin code removed.

-    strUsage += "  -dnsseed               " + _("Find peers using DNS lookup (default: 1 unless -connect)") + "\n";

Bitcoin dnsseed handling removed

 +    strUsage += "  -dnsseed               " + _("Query for peer addresses via DNS lookup, if low on addresses (default: 1 unless -connect)") + "\n";
 +    strUsage += "  -forcednsseed          " + _("Always query for peer addresses via DNS lookup (default: 0)") + "\n";

Scrypt interface for dnsseed handling included.

-    strUsage += "  -port=<port>           " + _("Listen for connections on <port> (default: 8333 or testnet: 18333)") + "\n";
+    strUsage += "  -port=<port>           " + _("Listen for connections on <port> (default: 9336 or testnet: 19336)") + "\n";

Port message is updated to Feathercoin Ports.

+    strUsage += "  -keypool=<n>           " + _("Set key pool size to <n> (default: 100)") + "\n";

keypool code is included? was bitcoin code earlier?

+#ifdef ENABLE_WALLET

if definition included, so action only taken if wallet open.

strUsage += "  -gen                   " + _("Generate coins (default: 0)") + "\n";         strUsage += "  -genproclimit=<n>      " + _("Set the processor limit for when generation is on (-1 = unlimited, default: -1)") + "\n";

Disabled unless in a FTC wallet.

+    strUsage += "  -rpcport=<port>        " + _("Listen for JSON-RPC connections on <port> (default: 9337 or testnet: 19337)") + "\n";

Active port message rename

 +    RenameThread("feathercoin-loadblk");

 if (fReindex) {

 +  /** Sanity checks
 +   *  Ensure that Bitcoin is running in a usable environment with all
 +   *  necessary library support.
 +   */
 +  bool InitSanityCheck(void)
 +  {
 +      if(!ECC_InitSanityCheck()) {
 +          InitError("OpenSSL appears to lack support for elliptic curve cryptography. For more "
 +                    "information, visit https://en.bitcoin.it/wiki/OpenSSL_and_EC_Libraries");
 +          return false;
 +      }
 +  
 +      // TODO: remaining sanity checks, see #4081
 +  
 +      return true;
 +  }
 +  
 +  /** Initialize feathercoin.

Feathercoin specific database re-index code is included.

+    setvbuf(stdout, NULL, _IOLBF, 0);

setvbuf included , scrypt interface? error message?

 +   // Make sure only a single feathercoin process is using the data directory.

Comment name change.

 +        return InitError(strprintf(_("Cannot obtain a lock on data directory %s. Feathercoin Core is probably already running."), strDataDir));

error message name change to Feathercoin. Bitcoin code removed

 +    LogPrintf("Feathercoin version %s (%s)\n", FormatFullVersion(), CLIENT_DATE);

Name change to Feathercoin. Bitcoin code removed.

+ #ifdef ENABLE_WALLET
+    LogPrintf("Using BerkeleyDB version %s\n", DbEnv::version(0, 0, 0));
+ #endif

Include an extra error message re database type.

- #if defined(USE_IPV6)
- #if ! USE_IPV6
-    else
-        SetLimited(NET_IPV6);
- #endif

Bitcoin code to handle ipv6 is removed.

 - #ifdef USE_IPV6
       if (!IsLimited(NET_IPV6))

An IPv6 ifdef is removed, but inside is – if ipv6 anyway, is this change needed? review IPv6 for head

 -# ifdef USE_IPV6
           fBound |= Bind(CService(in6addr_any, GetListenPort()), BF_NONE);

The if def is removed so an IPv6 function? runs on IPv4?

+  strErrors << _("Error loading wallet.dat: Wallet requires newer version of Feathercoin") << "\n";

Name change to Feathercoin error message. Bitcoin code replaced.

 +      strErrors << _("Wallet needed to be rewritten: restart Feathercoin to complete") << "\n";

Name change to Feathercoin error message. Bitcoin code replaced.

  +    LogPrintf("mapBlockIndex.size() = %u\n",   mapBlockIndex.size());

Name change to Feathercoin error message. Bitcoin code replaced.

-    LogPrintf("setKeyPool.size() = %"PRIszu"\n",      pwalletMain ? pwalletMain->setKeyPool.size() : 0);
-    LogPrintf("mapWallet.size() = %"PRIszu"\n",       pwalletMain ? pwalletMain->mapWallet.size() : 0);
-    LogPrintf("mapAddressBook.size() = %"PRIszu"\n",  pwalletMain ? pwalletMain->mapAddressBook.size() : 0);

Name change Bitcoin code replaced.

+    LogPrintf("setKeyPool.size() = %u\n",      pwalletMain ? pwalletMain->setKeyPool.size() : 0);
+    LogPrintf("mapWallet.size() = %u\n",       pwalletMain ? pwalletMain->mapWallet.size() : 0);
+    LogPrintf("mapAddressBook.size() = %u\n",  pwalletMain ? pwalletMain->mapAddressBook.size() : 0);

Feathercoin name change.

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/d46f1eec796bc422c4b7ccc2879aede80e1c2ff9

net.cpp

File consisting of a lot of feathercoin / scrypt specific settings. Consider maintaining separate FTC file integrated at build going forward to head.

 -  struct LocalServiceInfo {
 -    int nScore;
 -    int nPort;
 - } ;

Bitcoincode removed

 - static CCriticalSection cs_mapLocalHost;
 - static map<CNetAddr, LocalServiceInfo> mapLocalHost;

+ CCriticalSection cs_mapLocalHost;
+ map<CNetAddr, LocalServiceInfo> mapLocalHost;

The static definition is removed ? why? (scrypt interface?)

 +       LogPrint("net", "recv failed: %s\n", NetworkErrorString(nErr));

Log message interface change

-    for (int nHost = 1; nHost <= 2; nHost++)
+    for (int nHost = 1; nHost <= 1; nHost++)
       // We should be phasing out our use of sites like these. If we need
     // replacements, we should ask for volunteers to put this simple

nHost lower limit before incrementation changed.

 -   else if (nHost == 2)
 -   {
 -       addrConnect = CService("74.208.43.192", 80); // www.showmyip.com
 -
 -       if (nLookup == 1)
 -       {
 -           CService addrIP("www.showmyip.com", 80, true);
 -           if (addrIP.IsValid())
 -               addrConnect = addrIP;
 -       }
 -
 -       pszGet = "GET /simple/ HTTP/1.1\r\n"
 -                "Host: www.showmyip.com\r\n"
 -                "User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)\r\n"
 -                "Connection: close\r\n"
 -                "\r\n";
-
 -       pszKeyword = NULL; // Returns just IP address
 -   }

Bitcoin CService removed

   +     LogPrintf("ConnectSocket() : ioctlsocket non-blocking setting failed, error %s\n", NetworkErrorString(WSAGetLastError()));

Log interface change. Bitcoin code replaced.

 +        LogPrintf("ConnectSocket() : fcntl non-blocking setting failed, error %s\n", NetworkErrorString(errno));

Log interface change. Bitcoin code replaced.

 +         LogPrintf("socket send error %s\n", NetworkErrorString(nErr));

Log interface change. Bitcoin code replaced.

 -#ifdef USE_IPV6
         struct sockaddr_storage sockaddr;
 -#else
 -       struct sockaddr sockaddr;
 -#endif

If IPV6 removed so runs under iPv4

+          LogPrintf("socket error accept failed: %s\n", NetworkErrorString(nErr));

Log interface change. Bitcoin code replaced.

 -           {
 -               LOCK(cs_setservAddNodeAddresses);
 -               if (!setservAddNodeAddresses.count(addr))
 -                   closesocket(hSocket);
 -           }

Bitcoin lock interface removed

  +     closesocket(hSocket);

hSocket code added.

 +       LogPrintf("socket recv error %s\n", NetworkErrorString(nErr));

Log interface change. Bitcoin code replaced.

 -
 -     MilliSleep(10);

A sleep loop is removed.

  +       string strDesc = "Feathercoin " + FormatFullVersion();

Name change to Feathercoin.

 +      // goal: only query DNS seeds if address need is acute
 +      if ((addrman.size() > 0) &&
 +          (!GetBoolArg("-forcednsseed", false))) {
 +          MilliSleep(11 * 1000);
 +  
 +          LOCK(cs_vNodes);
 +          if (vNodes.size() >= 2) {
 +              LogPrintf("P2P peers available. Skipped DNS seeding.\n");
 +              return;
 +          }
 +      }
 +  

DNS code added.

- double static NodeSyncScore(const CNode *pnode) {
+ static int64_t NodeSyncScore(const CNode *pnode) {
-    return -pnode->nLastRecv;
+    return pnode->nLastRecv;

Bug fix, need more info on this change? interface change?

 -    double dBestScore = 0;
 +    int64_t nBestScore = 0;

Bestscore interface change.

    //   if ok, compare node's score with the best so far
 -            double dScore = NodeSyncScore(pnode);
 +            int64_t nScore = NodeSyncScore(pnode);
 -            if (pnodeNewSync == NULL || dScore > dBestScore) {
 +            if (pnodeNewSync == NULL || nScore > nBestScore) {
                 pnodeNewSync = pnode;
                 pnodeNewSync = pnode;
 -                dBestScore = dScore;
 +                nBestScore = nScore;

Best score interface implemented. (scrypt interface change?)

  - #ifdef USE_IPV6
       struct sockaddr_storage sockaddr;

If statements removed for IPv6

    +     strError = strprintf("Error: Couldn't open socket for incoming connections (socket returned error %s)", NetworkErrorString(WSAGetLastError()));

error interface change.

  +     strError = strprintf("Error: Couldn't set properties on socket for incoming connections (error %s)", NetworkErrorString(WSAGetLastError()));

error interface change.

 - #ifdef USE_IPV6
 // some systems don't have IPV6_V6ONLY but are always v6only; others do have the option

if IPv6 removed

 strError = strprintf(_("Unable to bind to %s on this computer. Feathercoin Core is probably already running."), addrBind.ToString());

Name change Bitcoin code removed

 +      strError = strprintf(_("Unable to bind to %s on this computer (bind returned error %s)"), addrBind.ToString(), NetworkErrorString(nErr));

Name change Bitcoin code removed

 +      strError = strprintf(_("Error: Listening for incoming connections failed (listen returned error %s)"), NetworkErrorString(WSAGetLastError()));

Name change Bitcoin code removed

 - #ifdef USE_IPV6
          else if (ifa->ifa_addr->sa_family == AF_INET6)

if IPv6 removed

  +    LogPrintf("closesocket(hListenSocket) failed with error %s\n", NetworkErrorString(WSAGetLastError()));

Log print interface change

 +   return error("%s : Failed to open file %s", __func__, pathTmp.string());

error print interface change

  +  return error("%s : Serialize or I/O error - %s", __func__, e.what());

  +  return error("%s : Rename-into-place failed", __func__);

  +   return error("%s : Failed to open file %s", __func__, pathAddr.string());

  +   return error("%s : Checksum mismatch, data corrupted", __func__);

  +   return error("%s : Invalid network magic number", __func__);

  +   return error("%s : Deserialize or I/O error - %s", __func__, e.what());

error print interface change

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/9cde7d1d32e266d8b98cc0b28750e9dcd8cb3cf9

miner.cpp

File consisting of a lot of feathercoin / scrypt specific settings. Consider maintaining separate FTC file integrated at build going forward to head.

+ #include "scrypt.h"
+ #include "auxpow.h"

Scrypt and Auxilliary proof of work is included.

+   pblock->vtx[0].vin[0].scriptSig = (CScript() << nHeight << CScriptNum(nExtraNonce)) + COINBASE_FLAGS;

Script interface change.

  +    LogPrintf("FeathercoinMiner:\n");

Name change to Feathercoin.

 +     return error("FeathercoinMiner : generated block is stale");

Error message interface change.

 +   void static FeathercoinMiner(CWallet *pwallet)

Feathercoin interface change

 +   LogPrintf("FeathercoinMiner started\n");
      SetThreadPriority(THREAD_PRIORITY_LOWEST);
 +   RenameThread("feathercoin-miner");

 +    LogPrintf("Running FeathercoinMiner with %u transactions in block (%u bytes)\n", pblock->vtx.size(),

LogPrint interface change.

   -       unsigned int nNonceFound;
   -        // Crypto++ SHA256
   -       nNonceFound = ScanHash_CryptoPP(pmidstate, pdata + 64, phash1,
    -                    (char*)&hash, nHashesDone);


 -        // Check if something found
 -        if (nNonceFound != (unsigned int) -1)
          {
 -         for (unsigned int i = 0; i < sizeof(hash)/4; i++)
 -        ((unsigned int*)&hash)[i] = ByteReverse(((unsigned int*)&hash)[i]);

-             pblock->nNonce = ByteReverse(nNonceFound);
-             assert(hash == pblock->GetHash());

Bitcoin interface removed.

 +        uint256 thash;
 +        char scratchpad[SCRYPT_SCRATCHPAD_SIZE];
 +        while (true)

+                scrypt_1024_1_1_256_sp(BEGIN(pblock->nVersion), BEGIN(thash), scratchpad);
+
+                if (thash <= hashTarget)

+                pblock->nNonce += 1;
+                nHashesDone += 1;
+                if ((pblock->nNonce & 0xFF) == 0)
+                    break;

Include Scrypt interface.

+    LogPrintf("FeathercoinMiner terminated\n");

 +    minerThreads->create_thread(boost::bind(&FeathercoinMiner, pwallet));

Name change interface changes to Feathercoin

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/a72b6f6608ef3bca7cdc60cd08d96e5730906b90

coins.h

File consisting of a lot of feathercoin / scrypt specific settings. Consider maintaining separate FTC file integrated at build going forward to head.

 + *    * 8358: compact amount representation for 60000000000 (600 FTC)

 + *    * 86ef97d579: compact amount representation for 234925952 (2.35 FTC)

 + *     * bbd123: compact amount representation for 110397 (0.001 FTC)

Feathercoin specific changes, Bitcoin code is replaced.

  +    /** Amount of feathercoins coming in to a transaction

Comment name update to Feathercoin, are comment changes neccessary?

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/f44fd83ef4d029bde85b37d9aa5f013c19b09e33

core.cpp

+ #include "auxpow.h"

Include auxiliary proof of work header. For scrypt interface

+   str += strprintf("CTransaction(hash=%s, ver=%d, vin.size=%u, vout.size=%u, nLockTime=%u)\n",

print Interface change. Bitcoin code removed

+   LogPrintf("CBlock(hash=%s, ver=%d, hashPrevBlock=%s, hashMerkleRoot=%s, nTime=%u, nBits=%08x, nNonce=%u, vtx=%u)\n",

Print Interface change. Bitcoin code removed

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/8fbccd63ab2ea5736499fd79072e37f0f8f62063

feathercoin-cli.cpp

feathercoin-cli.cpp is a new file, from Litecoin? Maintain separately / cherry pick?

 +  // Copyright (c) 2009-2010 Satoshi Nakamoto
 +  // Copyright (c) 2009-2013 The Bitcoin developers
 +  // Distributed under the MIT/X11 software license, see the accompanying
 +  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 +  
 +  #include "util.h"
 +  #include "init.h"
 +  #include "rpcclient.h"
 +  #include "rpcprotocol.h"
 +  #include "ui_interface.h" /* for _(...) */
 +  #include "chainparams.h"
 +  
 +  #include <boost/filesystem/operations.hpp>
 +  
 +  //////////////////////////////////////////////////////////////////////////////
 +  //
 +  // Start
 +  //
 +  static bool AppInitRPC(int argc, char* argv[])
 +  {
 +      //
 +      // Parameters
 +      //
 +      ParseParameters(argc, argv);
 +      if (!boost::filesystem::is_directory(GetDataDir(false)))
 +      {
 +          fprintf(stderr, "Error: Specified data directory \"%s\" does not exist.\n", mapArgs["-datadir"].c_str());
 +          return false;
 +      }
 +      try {
 +          ReadConfigFile(mapArgs, mapMultiArgs);
 +      } catch(std::exception &e) {
 +          fprintf(stderr,"Error reading configuration file: %s\n", e.what());
 +          return false;
 +      }
 +      // Check for -testnet or -regtest parameter (TestNet() calls are only valid after this clause)
 +      if (!SelectParamsFromCommandLine()) {
 +          fprintf(stderr, "Error: Invalid combination of -regtest and -testnet.\n");
 +          return false;
 +      }
 +  
 +      if (argc<2 || mapArgs.count("-?") || mapArgs.count("--help"))
 +      {
 +          // First part of help message is specific to RPC client
 +          std::string strUsage = _("Feathercoin Core RPC client version")      +   " "      +   FormatFullVersion()      +   "\n\n"      +  
 +              _("Usage:")      +   "\n"      +  
 +                "  feathercoin-cli [options] <command> [params]  "      +   _("Send command to Feathercoin Core")      +   "\n"      +  
 +                "  feathercoin-cli [options] help                "      +   _("List commands")      +   "\n"      +  
 +                "  feathercoin-cli [options] help <command>      "      +   _("Get help for a command")      +   "\n";
 +  
 +          strUsage      +  = "\n"      +   HelpMessageCli(true);
 +  
 +          fprintf(stdout, "%s", strUsage.c_str());
 +          return false;
 +      }
 +      return true;
 +  }
 +  
 +  int main(int argc, char* argv[])
 +  {
 +      SetupEnvironment();
 +  
 +      try
 +      {
 +          if(!AppInitRPC(argc, argv))
 +              return abs(RPC_MISC_ERROR);
 +      }
 +      catch (std::exception& e) {
 +          PrintExceptionContinue(&e, "AppInitRPC()");
 +          return abs(RPC_MISC_ERROR);
 +      } catch (...) {
 +          PrintExceptionContinue(NULL, "AppInitRPC()");
 +          return abs(RPC_MISC_ERROR);
 +      }
 +  
 +      int ret = abs(RPC_MISC_ERROR);
 +      try
 +      {
 +          ret = CommandLineRPC(argc, argv);
 +      }
 +      catch (std::exception& e) {
 +          PrintExceptionContinue(&e, "CommandLineRPC()");
 +      } catch (...) {
 +          PrintExceptionContinue(NULL, "CommandLineRPC()");
 +      }
 +      return ret;
 +  }

Copyright needs updating.

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/fe121c87cc28b2c1b07fd11559494edefcfd666a

feathercoind.cpp

feathercoind.cpp is a new file, from Litecoin? Maintain separately / cherry pick?

 +  // Copyright (c) 2009-2010 Satoshi Nakamoto
 +  // Copyright (c) 2009-2013 The Bitcoin developers
 +  // Distributed under the MIT/X11 software license, see the accompanying
 +  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 +  
 +  #include "util.h"
 +  #include "init.h"
 +  #include "rpcclient.h"
 +  #include "rpcprotocol.h"
 +  #include "ui_interface.h" /* for _(...) */
 +  #include "chainparams.h"
 +  
 +  #include <boost/filesystem/operations.hpp>
 +  
 +  //////////////////////////////////////////////////////////////////////////////
 +  //
 +  // Start
 +  //
 +  static bool AppInitRPC(int argc, char* argv[])
 +  {
 +      //
 +      // Parameters
 +      //
 +      ParseParameters(argc, argv);
 +      if (!boost::filesystem::is_directory(GetDataDir(false)))
 +      {
 +          fprintf(stderr, "Error: Specified data directory \"%s\" does not exist.\n", mapArgs["-datadir"].c_str());
 +          return false;
 +      }
 +      try {
 +          ReadConfigFile(mapArgs, mapMultiArgs);
 +      } catch(std::exception &e) {
 +          fprintf(stderr,"Error reading configuration file: %s\n", e.what());
 +          return false;
 +      }
 +      // Check for -testnet or -regtest parameter (TestNet() calls are only valid after this clause)
 +      if (!SelectParamsFromCommandLine()) {
 +          fprintf(stderr, "Error: Invalid combination of -regtest and -testnet.\n");
 +          return false;
 +      }
 +  
 +      if (argc<2 || mapArgs.count("-?") || mapArgs.count("--help"))
 +      {
 +          // First part of help message is specific to RPC client
 +          std::string strUsage = _("Feathercoin Core RPC client version")      +   " "      +   FormatFullVersion()      +   "\n\n"      +  
 +              _("Usage:")      +   "\n"      +  
 +                "  feathercoin-cli [options] <command> [params]  "      +   _("Send command to Feathercoin Core")      +   "\n"      +  
 +                "  feathercoin-cli [options] help                "      +   _("List commands")      +   "\n"      +  
 +                "  feathercoin-cli [options] help <command>      "      +   _("Get help for a command")      +   "\n";
 +  
 +          strUsage      +  = "\n"      +   HelpMessageCli(true);
 +  
 +          fprintf(stdout, "%s", strUsage.c_str());
 +          return false;
 +      }
 +      return true;
 +  }
 +  
 +  int main(int argc, char* argv[])
 +  {
 +      SetupEnvironment();
 +  
 +      try
 +      {
 +          if(!AppInitRPC(argc, argv))
 +              return abs(RPC_MISC_ERROR);
 +      }
 +      catch (std::exception& e) {
 +          PrintExceptionContinue(&e, "AppInitRPC()");
 +          return abs(RPC_MISC_ERROR);
 +      } catch (...) {
 +          PrintExceptionContinue(NULL, "AppInitRPC()");
 +          return abs(RPC_MISC_ERROR);
 +      }
 +  
 +      int ret = abs(RPC_MISC_ERROR);
 +      try
 +      {
 +          ret = CommandLineRPC(argc, argv);
 +      }
 +      catch (std::exception& e) {
 +          PrintExceptionContinue(&e, "CommandLineRPC()");
 +      } catch (...) {
 +          PrintExceptionContinue(NULL, "CommandLineRPC()");
 +      }
 +      return ret;
 +  }

Copyright needs update.

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/82bcdec1e61e0aca27fc63b357735d3ab59c7434

bitcoin-config.h

bitcoin-config.h is a new file, from Litecoin? Maintain separately / cherry pick?

This could be specified as an alternate file at build time? Is it auto generated?

 +  /* src/bitcoin-config.h.  Generated from bitcoin-config.h.in by configure.  */
 +  /* src/bitcoin-config.h.in.  Generated from configure.ac by autoheader.  */
 +  
 +  #ifndef BITCOIN_CONFIG_H
 +  
 +  #define BITCOIN_CONFIG_H
 +  
 +  /* Define if building universal (internal helper macro) */
 +  /* #undef AC_APPLE_UNIVERSAL_BUILD */
 +  
 +  /* Version Build */
 +  #define CLIENT_VERSION_BUILD 0
 +  
 +  /* Version is release */
 +  #define CLIENT_VERSION_IS_RELEASE true
 +  
 +  /* Major version */
 +  #define CLIENT_VERSION_MAJOR 0
 +  
 +  /* Minor version */
 +  #define CLIENT_VERSION_MINOR 9
 +  
 +  /* Build revision */
 +  #define CLIENT_VERSION_REVISION 3
 +  
 +  /* Version is release */
 +  #define COPYRIGHT_YEAR 2014
 +  
 +  /* Define to 1 to enable wallet functions */
 +  #define ENABLE_WALLET 1
 +  
 +  /* parameter and return value type for __fdelt_chk */
 +  /* #undef FDELT_TYPE */
 +  
 +  /* define if the Boost library is available */
 +  #define HAVE_BOOST /**/
 +  
 +  /* define if the Boost::Chrono library is available */
 +  #define HAVE_BOOST_CHRONO /**/
 +  
 +  /* define if the Boost::Filesystem library is available */
 +  #define HAVE_BOOST_FILESYSTEM /**/
 +  
 +  /* define if the Boost::PROGRAM_OPTIONS library is available */
 +  #define HAVE_BOOST_PROGRAM_OPTIONS /**/
 +  
 +  /* define if the Boost::System library is available */
 +  #define HAVE_BOOST_SYSTEM /**/
 +  
 +  /* define if the Boost::Thread library is available */
 +  #define HAVE_BOOST_THREAD /**/
 +  
 +  /* define if the Boost::Unit_Test_Framework library is available */
 +  /* #undef HAVE_BOOST_UNIT_TEST_FRAMEWORK */
 +  
 +  /* Define to 1 if you have the declaration of `strerror_r', and to 0 if you
 +     don't. */
 +  #define HAVE_DECL_STRERROR_R 0
 +  
 +  /* Define to 1 if you have the <inttypes.h> header file. */
 +  #define HAVE_INTTYPES_H 1
 +  
 +  /* Define to 1 if you have the `advapi32' library (-ladvapi32). */
 +  #define HAVE_LIBADVAPI32 1
 +  
 +  /* Define to 1 if you have the `comctl32' library (-lcomctl32). */
 +  #define HAVE_LIBCOMCTL32 1
 +  
 +  /* Define to 1 if you have the `comdlg32' library (-lcomdlg32). */
 +  #define HAVE_LIBCOMDLG32 1
 +  
 +  /* Define to 1 if you have the `crypt32' library (-lcrypt32). */
 +  #define HAVE_LIBCRYPT32 1
 +  
 +  /* Define to 1 if you have the `crypto' library (-lcrypto). */
 +  #define HAVE_LIBCRYPTO 1
 +  
 +  /* Define to 1 if you have the `gdi32' library (-lgdi32). */
 +  #define HAVE_LIBGDI32 1
 +  
 +  /* Define to 1 if you have the `imm32' library (-limm32). */
 +  #define HAVE_LIBIMM32 1
 +  
 +  /* Define to 1 if you have the `iphlpapi' library (-liphlpapi). */
 +  #define HAVE_LIBIPHLPAPI 1
 +  
 +  /* Define to 1 if you have the `kernel32' library (-lkernel32). */
 +  #define HAVE_LIBKERNEL32 1
 +  
 +  /* Define to 1 if you have the `mingwthrd' library (-lmingwthrd). */
 +  #define HAVE_LIBMINGWTHRD 1
 +  
 +  /* Define to 1 if you have the `miniupnpc' library (-lminiupnpc). */
 +  #define HAVE_LIBMINIUPNPC 1
 +  
 +  /* Define to 1 if you have the `mswsock' library (-lmswsock). */
 +  #define HAVE_LIBMSWSOCK 1
 +  
 +  /* Define to 1 if you have the `ole32' library (-lole32). */
 +  #define HAVE_LIBOLE32 1
 +  
 +  /* Define to 1 if you have the `oleaut32' library (-loleaut32). */
 +  #define HAVE_LIBOLEAUT32 1
 +  
 +  /* Define to 1 if you have the `png ' library (-lpng ). */
 +  #define HAVE_LIBPNG_ 1
 +  
 +  /* Define to 1 if you have the `protobuf ' library (-lprotobuf ). */
 +  #define HAVE_LIBPROTOBUF_ 1
 +  
 +  /* Define to 1 if you have the `qrencode' library (-lqrencode). */
 +  #define HAVE_LIBQRENCODE 1
 +  
 +  /* Define to 1 if you have the `rpcrt4' library (-lrpcrt4). */
 +  #define HAVE_LIBRPCRT4 1
 +  
 +  /* Define to 1 if you have the `shell32' library (-lshell32). */
 +  #define HAVE_LIBSHELL32 1
 +  
 +  /* Define to 1 if you have the `shlwapi' library (-lshlwapi). */
 +  #define HAVE_LIBSHLWAPI 1
 +  
 +  /* Define to 1 if you have the `ssl' library (-lssl). */
 +  #define HAVE_LIBSSL 1
 +  
 +  /* Define to 1 if you have the `user32' library (-luser32). */
 +  #define HAVE_LIBUSER32 1
 +  
 +  /* Define to 1 if you have the `uuid' library (-luuid). */
 +  #define HAVE_LIBUUID 1
 +  
 +  /* Define to 1 if you have the `winmm' library (-lwinmm). */
 +  #define HAVE_LIBWINMM 1
 +  
 +  /* Define to 1 if you have the `winspool' library (-lwinspool). */
 +  #define HAVE_LIBWINSPOOL 1
 +  
 +  /* Define to 1 if you have the `ws2_32' library (-lws2_32). */
 +  #define HAVE_LIBWS2_32 1
 +  
 +  /* Define to 1 if you have the `z ' library (-lz ). */
 +  #define HAVE_LIBZ_ 1
 +  
 +  /* Define to 1 if you have the <memory.h> header file. */
 +  #define HAVE_MEMORY_H 1
 +  
 +  /* Define to 1 if you have the <miniupnpc/miniupnpc.h> header file. */
 +  #define HAVE_MINIUPNPC_MINIUPNPC_H 1
 +  
 +  /* Define to 1 if you have the <miniupnpc/miniwget.h> header file. */
 +  #define HAVE_MINIUPNPC_MINIWGET_H 1
 +  
 +  /* Define to 1 if you have the <miniupnpc/upnpcommands.h> header file. */
 +  #define HAVE_MINIUPNPC_UPNPCOMMANDS_H 1
 +  
 +  /* Define to 1 if you have the <miniupnpc/upnperrors.h> header file. */
 +  #define HAVE_MINIUPNPC_UPNPERRORS_H 1
 +  
 +  /* Define this symbol if you have MSG_NOSIGNAL */
 +  /* #undef HAVE_MSG_NOSIGNAL */
 +  
 +  /* Define if you have POSIX threads libraries and header files. */
 +  #define HAVE_PTHREAD 1
 +  
 +  /* Have PTHREAD_PRIO_INHERIT. */
 +  #define HAVE_PTHREAD_PRIO_INHERIT 1
 +  
 +  /* Define to 1 if you have the <stdint.h> header file. */
 +  #define HAVE_STDINT_H 1
 +  
 +  /* Define to 1 if you have the <stdio.h> header file. */
 +  #define HAVE_STDIO_H 1
 +  
 +  /* Define to 1 if you have the <stdlib.h> header file. */
 +  #define HAVE_STDLIB_H 1
 +  
 +  /* Define to 1 if you have the `strerror_r' function. */
 +  /* #undef HAVE_STRERROR_R */
 +  
 +  /* Define to 1 if you have the <strings.h> header file. */
 +  #define HAVE_STRINGS_H 1
 +  
 +  /* Define to 1 if you have the <string.h> header file. */
 +  #define HAVE_STRING_H 1
 +  
 +  /* Define to 1 if you have the <sys/stat.h> header file. */
 +  #define HAVE_SYS_STAT_H 1
 +  
 +  /* Define to 1 if you have the <sys/types.h> header file. */
 +  #define HAVE_SYS_TYPES_H 1
 +  
 +  /* Define to 1 if you have the <unistd.h> header file. */
 +  #define HAVE_UNISTD_H 1
 +  
 +  /* Define this symbol if boost sleep works */
 +  /* #undef HAVE_WORKING_BOOST_SLEEP */
 +  
 +  /* Define this symbol if boost sleep_for works */
 +  #define HAVE_WORKING_BOOST_SLEEP_FOR 1
 +  
 +  /* Define to the address where bug reports for this package should be sent. */
 +  #define PACKAGE_BUGREPORT "info@ftc-c.com"
 +  
 +  /* Define to the full name of this package. */
 +  #define PACKAGE_NAME "Feathercoin Core"
 +  
 +  /* Define to the full name and version of this package. */
 +  #define PACKAGE_STRING "Feathercoin Core 0.9.3"
 +  
 +  /* Define to the one symbol short name of this package. */
 +  #define PACKAGE_TARNAME "feathercoin"
 +  
 +  /* Define to the home page for this package. */
 +  #define PACKAGE_URL ""
 +  
 +  /* Define to the version of this package. */
 +  #define PACKAGE_VERSION "0.9.3"
 +  
 +  /* Define to necessary symbol if this constant uses a non-standard name on
 +     your system. */
 +  /* #undef PTHREAD_CREATE_JOINABLE */
 +  
 +  /* Define this symbol if qt plugins are static */
 +  #define QT_STATICPLUGIN 1
 +  
 +  /* Define to 1 if you have the ANSI C header files. */
 +  #define STDC_HEADERS 1
 +  
 +  /* Define to 1 if strerror_r returns char *. */
 +  /* #undef STRERROR_R_CHAR_P */
 +  
 +  /* Define if dbus support should be compiled in */
 +  /* #undef USE_DBUS */
 +  
 +  /* Define if QR support should be compiled in */
 +  #define USE_QRCODE 1
 +  
 +  /* UPnP support not compiled if undefined, otherwise value (0 or 1) determines
 +     default state */
 +  #define USE_UPNP 0
 +  
 +  /* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most
 +     significant byte first (like Motorola and SPARC, unlike Intel). */
 +  #if defined AC_APPLE_UNIVERSAL_BUILD
 +  # if defined __BIG_ENDIAN__
 +  #  define WORDS_BIGENDIAN 1
 +  # endif
 +  #else
 +  # ifndef WORDS_BIGENDIAN
 +  /* #  undef WORDS_BIGENDIAN */
 +  # endif
 +  #endif
 +  
 +  /* Number of bits in a file offset, on hosts where this is settable. */
 +  #define _FILE_OFFSET_BITS 64
 +  
 +  /* Define for large files, on AIX-style hosts. */
 +  /* #undef _LARGE_FILES */
 +  
 +  #endif //BITCOIN_CONFIG_H

Copyrights need including.

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/82bcdec1e61e0aca27fc63b357735d3ab59c7434

version.cpp

version.cpp contains a number of Feathercoin settings , from Litecoin? Maintain separately / cherry pick?

This could be specified as an alternate file at build time?

// Client version number
-  #define CLIENT_VERSION_SUFFIX   "-beta"
+  #define CLIENT_VERSION_SUFFIX   "-Standard"

Optimistic.

  +// git will put "#define GIT_ARCHIVE 1" on the next line inside archives. 
  +#define GIT_ARCHIVE 1

 -#    define GIT_COMMIT_ID "$Format:%h$"
+#    define GIT_COMMIT_ID "it"
-#    define GIT_COMMIT_DATE "$Format:%cD$"
+#    define GIT_COMMIT_DATE "Fri, 12 September 2014 16:29:30 -0400"

Interface change to git.

+ #define BUILD_DESC_WITH_SUFFIX(maj,min,rev,build,suffix) \
+    "v" DO_STRINGIZE(maj) "." DO_STRINGIZE(min) "." DO_STRINGIZE(rev) "." DO_STRINGIZE(build) "-" DO_STRINGIZE(suffix)

Code added / build interface change?

  #ifndef BUILD_DESC
- #    ifdef GIT_COMMIT_ID
+ #    ifdef BUILD_SUFFIX
+ #    define BUILD_DESC UILD_DESC_WITH_SUFFIX(CLIENT_VERSION_MAJOR, CLIENT_VERSION_MINOR, CLIENT_VERSION_REVISION, CLIENT_VERSION_BUILD, BUILD_SUFFIX)
 +#    elif defined(GIT_COMMIT_ID)

More complicated build system, to account for scrypt additions?

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/1ace81fbc58f3cc24f60bb32edb3d39aa6b0207e

feathercoin-cli-res.rc

feathercoin-cli-res.rc contains a number of Feathercoin settings , from Litecoin, for scrypt interface change? Maintain separately / cherry pick?

Additional file to Bitcoin?.

This could be specified as an alternate file at build time?

 +  #include <windows.h>             // needed for VERSIONINFO
 +  #include "clientversion.h"       // holds the needed client version information
 +  
 +  #define VER_PRODUCTVERSION     CLIENT_VERSION_MAJOR,CLIENT_VERSION_MINOR,CLIENT_VERSION_REVISION,CLIENT_VERSION_BUILD
 +  #define VER_PRODUCTVERSION_STR STRINGIZE(CLIENT_VERSION_MAJOR) "." STRINGIZE(CLIENT_VERSION_MINOR) "." STRINGIZE(CLIENT_VERSION_REVISION) "." STRINGIZE(CLIENT_VERSION_BUILD)
 +  #define VER_FILEVERSION        VER_PRODUCTVERSION
 +  #define VER_FILEVERSION_STR    VER_PRODUCTVERSION_STR
 +  #define COPYRIGHT_STR          "Feathercoin developers 2013-" STRINGIZE(COPYRIGHT_YEAR) ", The Bitcoin developers 2009-" STRINGIZE(COPYRIGHT_YEAR)
 +  
 +  VS_VERSION_INFO VERSIONINFO
 +  FILEVERSION     VER_FILEVERSION
 +  PRODUCTVERSION  VER_PRODUCTVERSION
 +  FILEOS          VOS_NT_WINDOWS32
 +  FILETYPE        VFT_APP
 +  BEGIN
 +      BLOCK "StringFileInfo"
 +      BEGIN
 +          BLOCK "040904E4" // U.S. English - multilingual (hex)
 +          BEGIN
 +              VALUE "CompanyName",        "Feathercoin"
 +              VALUE "FileDescription",    "Feathercoin-cli (OSS RPC client for Feathercoin)"
 +              VALUE "FileVersion",        VER_FILEVERSION_STR
 +              VALUE "InternalName",       "feathercoin-cli"
 +              VALUE "LegalCopyright",     COPYRIGHT_STR
 +              VALUE "LegalTrademarks1",   "Distributed under the MIT/X11 software license, see the accompanying file COPYING or http://www.opensource.org/licenses/mit-license.php."
 +              VALUE "OriginalFilename",   "feathercoin-cli.exe"
 +              VALUE "ProductName",        "Feathercoin-cli"
 +              VALUE "ProductVersion",     VER_PRODUCTVERSION_STR
 +          END
 +      END
 +  
 +      BLOCK "VarFileInfo"
 +      BEGIN
 +          VALUE "Translation", 0x0, 1252 // language neutral - multilingual (decimal)
 +      END
 +  END

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/7a8051972186f24ba2fed3be5abe8e7cd586bc75

auxpow.cpp

auxpow.cpp contains a number of Feathercoin settings , from Litecoin, for scrypt interface change? Maintain separately / cherry pick?

Additional file to Bitcoin.

This could be specified as an alternate file at build time?

 +  // Copyright (c) 2011 Vince Durham
 +  // Distributed under the MIT/X11 software license, see the accompanying
 +  // file license.txt or http://www.opensource.org/licenses/mit-license.php.
 +  #include "script.h"
 +  #include "auxpow.h"
 +  #include "init.h"
 +  
 +  using namespace std;
 +  using namespace boost;
 +  
 +  unsigned char pchMergedMiningHeader[] = { 0xfa, 0xbe, 'm', 'm' } ;
 +  
 +  void RemoveMergedMiningHeader(vector<unsigned char>& vchAux)
 +  {
 +      if (vchAux.begin() != std::search(vchAux.begin(), vchAux.end(), UBEGIN(pchMergedMiningHeader), UEND(pchMergedMiningHeader)))
 +          throw runtime_error("merged mining aux too short");
 +      vchAux.erase(vchAux.begin(), vchAux.begin()      +   sizeof(pchMergedMiningHeader));
 +  }
 +  
 +  bool CAuxPow::Check(uint256 hashAuxBlock, int nChainID)
 +  {
 +      if (nIndex != 0)
 +          return error("AuxPow is not a generate");
 +  
 +      if (!TestNet() && parentBlockHeader.GetChainID() == nChainID)
 +          return error("Aux POW parent has our chain ID");
 +  
 +      if (vChainMerkleBranch.size() > 30)
 +          return error("Aux POW chain merkle branch too long");
 +  
 +      // Check that the chain merkle root is in the coinbase
 +      uint256 nRootHash = CBlock::CheckMerkleBranch(hashAuxBlock, vChainMerkleBranch, nChainIndex);
 +      vector<unsigned char> vchRootHash(nRootHash.begin(), nRootHash.end());
 +      std::reverse(vchRootHash.begin(), vchRootHash.end()); // correct endian
 +  
 +      // Check that we are in the parent block merkle tree
 +      if (CBlock::CheckMerkleBranch(GetHash(), vMerkleBranch, nIndex) != parentBlockHeader.hashMerkleRoot)
 +          return error("Aux POW merkle root incorrect");
 +  
 +      const CScript script = vin[0].scriptSig;
 +  
 +      // Check that the same work is not submitted twice to our chain.
 +      //
 +  
 +      CScript::const_iterator pcHead =
 +          std::search(script.begin(), script.end(), UBEGIN(pchMergedMiningHeader), UEND(pchMergedMiningHeader));
 +  
 +      CScript::const_iterator pc =
 +          std::search(script.begin(), script.end(), vchRootHash.begin(), vchRootHash.end());
 +  
 +      if (pcHead == script.end())
 +          return error("MergedMiningHeader missing from parent coinbase");
 +  
 +      if (pc == script.end())
 +          return error("Aux POW missing chain merkle root in parent coinbase");
 +  
 +      if (pcHead != script.end())
 +      {
 +          // Enforce only one chain merkle root by checking that a single instance of the merged
 +          // mining header exists just before.
 +          if (script.end() != std::search(pcHead      +   1, script.end(), UBEGIN(pchMergedMiningHeader), UEND(pchMergedMiningHeader)))
 +              return error("Multiple merged mining headers in coinbase");
 +          if (pcHead      +   sizeof(pchMergedMiningHeader) != pc)
 +              return error("Merged mining header is not just before chain merkle root");
 +      }
 +      else
 +      {
 +          // For backward compatibility.
 +          // Enforce only one chain merkle root by checking that it starts early in the coinbase.
 +          // 8-12 bytes are enough to encode extraNonce and nBits.
 +          if (pc - script.begin() > 20)
 +              return error("Aux POW chain merkle root must start in the first 20 bytes of the parent coinbase");
 +      }
 +  
 +  
 +      // Ensure we are at a deterministic point in the merkle leaves by hashing
 +      // a nonce and our chain ID and comparing to the index.
 +      pc      +  = vchRootHash.size();
 +      if (script.end() - pc < 8)
 +          return error("Aux POW missing chain merkle tree size and nonce in parent coinbase");
 +  
 +      int nSize;
 +      memcpy(&nSize, &pc[0], 4);
 +      if (nSize != (1 << vChainMerkleBranch.size()))
 +          return error("Aux POW merkle branch size does not match parent coinbase");
 +  
 +      int nNonce;
 +      memcpy(&nNonce, &pc[4], 4);
 +  
 +      // Choose a pseudo-random slot in the chain merkle tree
 +      // but have it be fixed for a size/nonce/chain combination.
 +      //
 +      // This prevents the same work from being used twice for the
 +      // same chain while reducing the chance that two chains clash
 +      // for the same slot.
 +      unsigned int rand = nNonce;
 +      rand = rand * 1103515245      +   12345;
 +      rand      +  = nChainID;
 +      rand = rand * 1103515245      +   12345;
 +  
 +      if (nChainIndex != (rand % nSize))
 +          return error("Aux POW wrong index");
 +  
 +      return true;
 +  }
 +  
 +  CScript MakeCoinbaseWithAux(unsigned int nHeight, unsigned int nExtraNonce, vector<unsigned char>& vchAux)
 +  {
 +      vector<unsigned char> vchAuxWithHeader(UBEGIN(pchMergedMiningHeader), UEND(pchMergedMiningHeader));
 +      vchAuxWithHeader.insert(vchAuxWithHeader.end(), vchAux.begin(), vchAux.end());
 +  
 +      CScript script = (CScript() << nHeight << CScriptNum(nExtraNonce))      +   COINBASE_FLAGS;
 +      
 +      // Push OP_2 just in case we want versioning later
 +      script = script << OP_2 << vchAuxWithHeader;
 +      
 +      return script;
 +  }
 +  
 +  
 +  void IncrementExtraNonceWithAux(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce, vector<unsigned char>& vchAux)
 +  {
 +      // Update nExtraNonce
 +      static uint256 hashPrevBlock;
 +      if (hashPrevBlock != pblock->hashPrevBlock)
 +      {
 +          nExtraNonce = 0;
 +          hashPrevBlock = pblock->hashPrevBlock;
 +      }
 +           +       +  nExtraNonce;
 +  
 +      unsigned int nHeight = pindexPrev->nHeight     +  1; // Height first in coinbase required for block.version=2
 +      pblock->vtx[0].vin[0].scriptSig = MakeCoinbaseWithAux(nHeight, nExtraNonce, vchAux);
 +      pblock->hashMerkleRoot = pblock->BuildMerkleTree();
 +  }
 +  
 +  

Copyright - cherry pick from Litecoin / FTC

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/dd48f45ec1b22a82fb8c94eee647e1e8a1c1013c

auxpow.h

auxpow.h contains a number of Feathercoin settings , from Litecoin, for scrypt interface change Maintain separately / cherry pick?

Additional file to Bitcoin.

This could be specified as an alternate file at build time?

 +  // Copyright (c) 2009-2010 Satoshi Nakamoto
 +  // Distributed under the MIT/X11 software license, see the accompanying
 +  // file license.txt or http://www.opensource.org/licenses/mit-license.php.
 +  #ifndef BITCOIN_AUXPOW_H
 +  #define BITCOIN_AUXPOW_H
 +  
 +  #include "main.h"
 +  
 +  class CAuxPow : public CMerkleTx
 +  {
 +  public:
 +      CAuxPow(const CTransaction& txIn) : CMerkleTx(txIn)
 +      {
 +      }
 +  
 +      CAuxPow() :CMerkleTx()
 +      {
 +      }
 +  
 +      // Merkle branch with root vchAux
 +      // root must be present inside the coinbase
 +      std::vector<uint256> vChainMerkleBranch;
 +      // Index of chain in chains merkle tree
 +      unsigned int nChainIndex;
 +      CBlockHeader parentBlockHeader;
 +  
 +      IMPLEMENT_SERIALIZE
 +      (
 +          nSerSize      +  = SerReadWrite(s, *(CMerkleTx*)this, nType, nVersion, ser_action);
 +          nVersion = this->nVersion;
 +          READWRITE(vChainMerkleBranch);
 +          READWRITE(nChainIndex);
 +  
 +          // Always serialize the saved parent block as header so that the size of CAuxPow
 +          // is consistent.
 +          nSerSize      +  = SerReadWrite(s, parentBlockHeader, nType, nVersion, ser_action);
 +      )
 +  
 +      bool Check(uint256 hashAuxBlock, int nChainID);
 +  
 +      uint256 GetParentBlockHash()
 +      {
 +          return parentBlockHeader.GetPoWHash();
 +      }
 +  };
 +  
 +  template <typename Stream>
 +  int ReadWriteAuxPow(Stream& s, const boost::shared_ptr<CAuxPow>& auxpow, int nType, int nVersion, CSerActionGetSerializeSize ser_action)
 +  {
 +      if (nVersion & BLOCK_VERSION_AUXPOW)
 +      {
 +          return ::GetSerializeSize(*auxpow, nType, nVersion);
 +      }
 +      return 0;
 +  }
 +  
 +  template <typename Stream>
 +  int ReadWriteAuxPow(Stream& s, const boost::shared_ptr<CAuxPow>& auxpow, int nType, int nVersion, CSerActionSerialize ser_action)
 +  {
 +      if (nVersion & BLOCK_VERSION_AUXPOW)
 +      {
 +          return SerReadWrite(s, *auxpow, nType, nVersion, ser_action);
 +      }
 +      return 0;
 +  }
 +  
 +  template <typename Stream>
 +  int ReadWriteAuxPow(Stream& s, boost::shared_ptr<CAuxPow>& auxpow, int nType, int nVersion, CSerActionUnserialize ser_action)
 +  {
 +      if (nVersion & BLOCK_VERSION_AUXPOW)
 +      {
 +          auxpow.reset(new CAuxPow());
 +          return SerReadWrite(s, *auxpow, nType, nVersion, ser_action);
 +      }
 +      else
 +      {
 +          auxpow.reset();
 +          return 0;
 +      }
 +  }
 +  
 +  extern void RemoveMergedMiningHeader(std::vector<unsigned char>& vchAux);
 +  extern CScript MakeCoinbaseWithAux(unsigned int nBits, unsigned int nExtraNonce, std::vector<unsigned char>& vchAux);
 +  #endif

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/dd48f45ec1b22a82fb8c94eee647e1e8a1c1013c

scrypt.cpp

scrypt.cpp contains a number of Feathercoin settings , from Litecoin, for scrypt interface change Maintain separately / cherry pick?

Additional file to Bitcoin.

This could be specified as an alternate file at build time?

 +  /*
 +   * Copyright 2009 Colin Percival, 2011 ArtForz, 2012-2013 pooler
 +   * All rights reserved.
 +   *
 +   * Redistribution and use in source and binary forms, with or without
 +   * modification, are permitted provided that the following conditions
 +   * are met:
 +   * 1. Redistributions of source code must retain the above copyright
 +   *    notice, this list of conditions and the following disclaimer.
 +   * 2. Redistributions in binary form must reproduce the above copyright
 +   *    notice, this list of conditions and the following disclaimer in the
 +   *    documentation and/or other materials provided with the distribution.
 +   *
 +   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 +   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 +   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 +   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 +   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 +   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 +   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 +   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 +   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 +   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 +   * SUCH DAMAGE.
 +   *
 +   * This file was originally written by Colin Percival as part of the Tarsnap
 +   * online backup system.
 +   */
 +  
 +   // Copyright (c) 2013-2014 Dogecoin Developers
 +  
 +  #include "scrypt.h"
 +  #include "util.h"
 +  #include <stdlib.h>
 +  #include <stdint.h>
 +  #include <string.h>
 +  #include <openssl/sha.h>
 +  
 +  #if defined(USE_SSE2) && !defined(USE_SSE2_ALWAYS)
 +  #ifdef _MSC_VER
 +  // MSVC 64bit is unable to use inline asm
 +  #include <intrin.h>
 +  #else
 +  // GCC Linux or i686-w64-mingw32
 +  #include <cpuid.h>
 +  #endif
 +  #endif
 +  
 +  static inline uint32_t be32dec(const void *pp)
 +  {
 +  	const uint8_t *p = (uint8_t const *)pp;
 +  	return ((uint32_t)(p[3])      +   ((uint32_t)(p[2]) << 8)      +  
 +  	    ((uint32_t)(p[1]) << 16)      +   ((uint32_t)(p[0]) << 24));
 +  }
 +  
 +  static inline void be32enc(void *pp, uint32_t x)
 +  {
 +  	uint8_t *p = (uint8_t *)pp;
 +  	p[3] = x & 0xff;
 +  	p[2] = (x >> 8) & 0xff;
 +  	p[1] = (x >> 16) & 0xff;
 +  	p[0] = (x >> 24) & 0xff;
 +  }
 +  
 +  typedef struct HMAC_SHA256Context {
 +  	SHA256_CTX ictx;
 +  	SHA256_CTX octx;
 +  } HMAC_SHA256_CTX;
 +  
 +  /* Initialize an HMAC-SHA256 operation with the given key. */
 +  static void
 +  HMAC_SHA256_Init(HMAC_SHA256_CTX *ctx, const void *_K, size_t Klen)
 +  {
 +  	unsigned char pad[64];
 +  	unsigned char khash[32];
 +  	const unsigned char *K = (const unsigned char *)_K;
 +  	size_t i;
 +  
 +  	/* If Klen > 64, the key is really SHA256(K). */
 +  	if (Klen > 64) {
 +  		SHA256_Init(&ctx->ictx);
 +  		SHA256_Update(&ctx->ictx, K, Klen);
 +  		SHA256_Final(khash, &ctx->ictx);
 +  		K = khash;
 +  		Klen = 32;
 +  	}
 +  
 +  	/* Inner SHA256 operation is SHA256(K xor [block of 0x36] || data). */
 +  	SHA256_Init(&ctx->ictx);
 +  	memset(pad, 0x36, 64);
 +  	for (i = 0; i < Klen; i     +       +  )
 +  		pad[i] ^= K[i];
 +  	SHA256_Update(&ctx->ictx, pad, 64);
 +  
 +  	/* Outer SHA256 operation is SHA256(K xor [block of 0x5c] || hash). */
 +  	SHA256_Init(&ctx->octx);
 +  	memset(pad, 0x5c, 64);
 +  	for (i = 0; i < Klen; i     +       +  )
 +  		pad[i] ^= K[i];
 +  	SHA256_Update(&ctx->octx, pad, 64);
 +  
 +  	/* Clean the stack. */
 +  	memset(khash, 0, 32);
 +  }
 +  
 +  /* Add bytes to the HMAC-SHA256 operation. */
 +  static void
 +  HMAC_SHA256_Update(HMAC_SHA256_CTX *ctx, const void *in, size_t len)
 +  {
 +  	/* Feed data to the inner SHA256 operation. */
 +  	SHA256_Update(&ctx->ictx, in, len);
 +  }
 +  
 +  /* Finish an HMAC-SHA256 operation. */
 +  static void
 +  HMAC_SHA256_Final(unsigned char digest[32], HMAC_SHA256_CTX *ctx)
 +  {
 +  	unsigned char ihash[32];
 +  
 +  	/* Finish the inner SHA256 operation. */
 +  	SHA256_Final(ihash, &ctx->ictx);
 +  
 +  	/* Feed the inner hash to the outer SHA256 operation. */
 +  	SHA256_Update(&ctx->octx, ihash, 32);
 +  
 +  	/* Finish the outer SHA256 operation. */
 +  	SHA256_Final(digest, &ctx->octx);
 +  
 +  	/* Clean the stack. */
 +  	memset(ihash, 0, 32);
 +  }
 +  
 +  /**
 +   * PBKDF2_SHA256(passwd, passwdlen, salt, saltlen, c, buf, dkLen):
 +   * Compute PBKDF2(passwd, salt, c, dkLen) using HMAC-SHA256 as the PRF, and
 +   * write the output to buf.  The value dkLen must be at most 32 * (2^32 - 1).
 +   */
 +  void
 +  PBKDF2_SHA256(const uint8_t *passwd, size_t passwdlen, const uint8_t *salt,
 +      size_t saltlen, uint64_t c, uint8_t *buf, size_t dkLen)
 +  {
 +  	HMAC_SHA256_CTX PShctx, hctx;
 +  	size_t i;
 +  	uint8_t ivec[4];
 +  	uint8_t U[32];
 +  	uint8_t T[32];
 +  	uint64_t j;
 +  	int k;
 +  	size_t clen;
 +  
 +  	/* Compute HMAC state after processing P and S. */
 +  	HMAC_SHA256_Init(&PShctx, passwd, passwdlen);
 +  	HMAC_SHA256_Update(&PShctx, salt, saltlen);
 +  
 +  	/* Iterate through the blocks. */
 +  	for (i = 0; i * 32 < dkLen; i     +       +  ) {
 +  		/* Generate INT(i      +   1). */
 +  		be32enc(ivec, (uint32_t)(i      +   1));
 +  
 +  		/* Compute U_1 = PRF(P, S || INT(i)). */
 +  		memcpy(&hctx, &PShctx, sizeof(HMAC_SHA256_CTX));
 +  		HMAC_SHA256_Update(&hctx, ivec, 4);
 +  		HMAC_SHA256_Final(U, &hctx);
 +  
 +  		/* T_i = U_1 ... */
 +  		memcpy(T, U, 32);
 +  
 +  		for (j = 2; j <= c; j     +       +  ) {
 +  			/* Compute U_j. */
 +  			HMAC_SHA256_Init(&hctx, passwd, passwdlen);
 +  			HMAC_SHA256_Update(&hctx, U, 32);
 +  			HMAC_SHA256_Final(U, &hctx);
 +  
 +  			/* ... xor U_j ... */
 +  			for (k = 0; k < 32; k     +       +  )
 +  				T[k] ^= U[k];
 +  		}
 +  
 +  		/* Copy as many bytes as necessary into buf. */
 +  		clen = dkLen - i * 32;
 +  		if (clen > 32)
 +  			clen = 32;
 +  		memcpy(&buf[i * 32], T, clen);
 +  	}
 +  
 +  	/* Clean PShctx, since we never called _Final on it. */
 +  	memset(&PShctx, 0, sizeof(HMAC_SHA256_CTX));
 +  }
 +  
 +  #define ROTL(a, b) (((a) << (b)) | ((a) >> (32 - (b))))
 +  
 +  static inline void xor_salsa8(uint32_t B[16], const uint32_t Bx[16])
 +  {
 +  	uint32_t x00,x01,x02,x03,x04,x05,x06,x07,x08,x09,x10,x11,x12,x13,x14,x15;
 +  	int i;
 +  
 +  	x00 = (B[ 0] ^= Bx[ 0]);
 +  	x01 = (B[ 1] ^= Bx[ 1]);
 +  	x02 = (B[ 2] ^= Bx[ 2]);
 +  	x03 = (B[ 3] ^= Bx[ 3]);
 +  	x04 = (B[ 4] ^= Bx[ 4]);
 +  	x05 = (B[ 5] ^= Bx[ 5]);
 +  	x06 = (B[ 6] ^= Bx[ 6]);
 +  	x07 = (B[ 7] ^= Bx[ 7]);
 +  	x08 = (B[ 8] ^= Bx[ 8]);
 +  	x09 = (B[ 9] ^= Bx[ 9]);
 +  	x10 = (B[10] ^= Bx[10]);
 +  	x11 = (B[11] ^= Bx[11]);
 +  	x12 = (B[12] ^= Bx[12]);
 +  	x13 = (B[13] ^= Bx[13]);
 +  	x14 = (B[14] ^= Bx[14]);
 +  	x15 = (B[15] ^= Bx[15]);
 +  	for (i = 0; i < 8; i      +  = 2) {
 +  		/* Operate on columns. */
 +  		x04 ^= ROTL(x00      +   x12,  7);  x09 ^= ROTL(x05      +   x01,  7);
 +  		x14 ^= ROTL(x10      +   x06,  7);  x03 ^= ROTL(x15      +   x11,  7);
 +  
 +  		x08 ^= ROTL(x04      +   x00,  9);  x13 ^= ROTL(x09      +   x05,  9);
 +  		x02 ^= ROTL(x14      +   x10,  9);  x07 ^= ROTL(x03      +   x15,  9);
 +  
 +  		x12 ^= ROTL(x08      +   x04, 13);  x01 ^= ROTL(x13      +   x09, 13);
 +  		x06 ^= ROTL(x02      +   x14, 13);  x11 ^= ROTL(x07      +   x03, 13);
 +  
 +  		x00 ^= ROTL(x12      +   x08, 18);  x05 ^= ROTL(x01      +   x13, 18);
 +  		x10 ^= ROTL(x06      +   x02, 18);  x15 ^= ROTL(x11      +   x07, 18);
 +  
 +  		/* Operate on rows. */
 +  		x01 ^= ROTL(x00      +   x03,  7);  x06 ^= ROTL(x05      +   x04,  7);
 +  		x11 ^= ROTL(x10      +   x09,  7);  x12 ^= ROTL(x15      +   x14,  7);
 +  
 +  		x02 ^= ROTL(x01      +   x00,  9);  x07 ^= ROTL(x06      +   x05,  9);
 +  		x08 ^= ROTL(x11      +   x10,  9);  x13 ^= ROTL(x12      +   x15,  9);
 +  
 +  		x03 ^= ROTL(x02      +   x01, 13);  x04 ^= ROTL(x07      +   x06, 13);
 +  		x09 ^= ROTL(x08      +   x11, 13);  x14 ^= ROTL(x13      +   x12, 13);
 +  
 +  		x00 ^= ROTL(x03      +   x02, 18);  x05 ^= ROTL(x04      +   x07, 18);
 +  		x10 ^= ROTL(x09      +   x08, 18);  x15 ^= ROTL(x14      +   x13, 18);
 +  	}
 +  	B[ 0]      +  = x00;
 +  	B[ 1]      +  = x01;
 +  	B[ 2]      +  = x02;
 +  	B[ 3]      +  = x03;
 +  	B[ 4]      +  = x04;
 +  	B[ 5]      +  = x05;
 +  	B[ 6]      +  = x06;
 +  	B[ 7]      +  = x07;
 +  	B[ 8]      +  = x08;
 +  	B[ 9]      +  = x09;
 +  	B[10]      +  = x10;
 +  	B[11]      +  = x11;
 +  	B[12]      +  = x12;
 +  	B[13]      +  = x13;
 +  	B[14]      +  = x14;
 +  	B[15]      +  = x15;
 +  }
 +  
 +  void scrypt_1024_1_1_256_sp_generic(const char *input, char *output, char *scratchpad)
 +  {
 +  	uint8_t B[128];
 +  	uint32_t X[32];
 +  	uint32_t *V;
 +  	uint32_t i, j, k;
 +  
 +  	V = (uint32_t *)(((uintptr_t)(scratchpad)      +   63) & ~ (uintptr_t)(63));
 +  
 +  	PBKDF2_SHA256((const uint8_t *)input, 80, (const uint8_t *)input, 80, 1, B, 128);
 +  
 +  	for (k = 0; k < 32; k     +       +  )
 +  		X[k] = le32dec(&B[4 * k]);
 +  
 +  	for (i = 0; i < 1024; i     +       +  ) {
 +  		memcpy(&V[i * 32], X, 128);
 +  		xor_salsa8(&X[0], &X[16]);
 +  		xor_salsa8(&X[16], &X[0]);
 +  	}
 +  	for (i = 0; i < 1024; i     +       +  ) {
 +  		j = 32 * (X[16] & 1023);
 +  		for (k = 0; k < 32; k     +       +  )
 +  			X[k] ^= V[j      +   k];
 +  		xor_salsa8(&X[0], &X[16]);
 +  		xor_salsa8(&X[16], &X[0]);
 +  	}
 +  
 +  	for (k = 0; k < 32; k     +       +  )
 +  		le32enc(&B[4 * k], X[k]);
 +  
 +  	PBKDF2_SHA256((const uint8_t *)input, 80, B, 128, 1, (uint8_t *)output, 32);
 +  }
 +  
 +  #if defined(USE_SSE2)
 +  // By default, set to generic scrypt function. This will prevent crash in case when scrypt_detect_sse2() wasn't called
 +  void (*scrypt_1024_1_1_256_sp_detected)(const char *input, char *output, char *scratchpad) = &scrypt_1024_1_1_256_sp_generic;
 +  
 +  void scrypt_detect_sse2()
 +  {
 +  #if defined(USE_SSE2_ALWAYS)
 +      printf("scrypt: using scrypt-sse2 as built.\n");
 +  #else // USE_SSE2_ALWAYS
 +      // 32bit x86 Linux or Windows, detect cpuid features
 +      unsigned int cpuid_edx=0;
 +  #if defined(_MSC_VER)
 +      // MSVC
 +      int x86cpuid[4];
 +      __cpuid(x86cpuid, 1);
 +      cpuid_edx = (unsigned int)buffer[3];
 +  #else // _MSC_VER
 +      // Linux or i686-w64-mingw32 (gcc-4.6.3)
 +      unsigned int eax, ebx, ecx;
 +      __get_cpuid(1, &eax, &ebx, &ecx, &cpuid_edx);
 +  #endif // _MSC_VER
 +  
 +      if (cpuid_edx & 1<<26)
 +      {
 +          scrypt_1024_1_1_256_sp_detected = &scrypt_1024_1_1_256_sp_sse2;
 +          printf("scrypt: using scrypt-sse2 as detected.\n");
 +      }
 +      else
 +      {
 +          scrypt_1024_1_1_256_sp_detected = &scrypt_1024_1_1_256_sp_generic;
 +          printf("scrypt: using scrypt-generic, SSE2 unavailable.\n");
 +      }
 +  #endif // USE_SSE2_ALWAYS
 +  }
 +  #endif
 +  
 +  void scrypt_1024_1_1_256(const char *input, char *output)
 +  {
 +  	char scratchpad[SCRYPT_SCRATCHPAD_SIZE];
 +      scrypt_1024_1_1_256_sp(input, output, scratchpad);
 +  }

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/30516a6ce8d723cc3d8eb624e2d30431843f01a0

script.cpp

Commit 2

 - #include "bignum.h"

Biitcoin code removed

 +static const CScriptNum bnZero(0);
 +static const CScriptNum bnOne(1);
 +static const CScriptNum bnFalse(0);
 +static const CScriptNum bnTrue(1);

Scrypt interface.

    -CBigNum CastToBigNum(const valtype& vch)
    -{
    -    if (vch.size() > nMaxNumSize)
    -        throw runtime_error("CastToBigNum() : overflow");
    -    // Get rid of extra leading zeros
    -    return CBigNum(CBigNum(vch).getvch());
    -}

    -    if (flags & SCRIPT_VERIFY_EVEN_S) {
    -     if (S[nLenS-1] & 1)
    -      return error("Non-canonical signature: S value odd");

  -    CAutoBN_CTX pctx;

Remove Bitcoin code.

 +    if (flags & SCRIPT_VERIFY_LOW_S) {
 +        // If the S value is above the order of the curve divided by two, its
 +        // complement modulo the order could have been used instead, which is
 +        // one byte shorter when encoded correctly.
 +        if (!CKey::CheckSignatureElement(S, nLenS, true))
 +            return error("Non-canonical signature: S value is unnecessarily high");

Scrypt code removed

   +        CScriptNum bn((int)opcode - (int)(OP_1 - 1));

Bitcoin code replaced. Scrypt interface

  +                    CScriptNum bn(stack.size());

 +           int n = CScriptNum(stacktop(-1)).getint();

 +          CScriptNum bn(stacktop(-1).size());

 +           CScriptNum bn(stacktop(-1));

 +            CScriptNum bn1(stacktop(-2));
 +            CScriptNum bn2(stacktop(-1));
 +            CScriptNum bn(0);

 +           CScriptNum bn1(stacktop(-3));
 +           CScriptNum bn2(stacktop(-2));
 +           CScriptNum bn3(stacktop(-1));

 +           int nKeysCount = CScriptNum(stacktop(-i)).getint();

 +           int nSigsCount = CScriptNum(stacktop(-i)).getint();

Bitcoin code replaced. Scrypt interface

 +        // Feathercoin address tx, sender provides hash of pubkey, receiver provides signature and pubkey

Name change for comment?

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/9346686d71f874429a5b0508bdc3be50850e7b66

scrypt.h

scrypt.h contains a number of Feathercoin settings , from Litecoin / Dogecoin? , for scrypt interface change Maintain separately / cherry pick?

Additional file to Bitcoin.

This could be specified as an alternate file at build time?

 +  // Copyright (c) 2013-2014 Dogecoin Developers
 +  
 +  #ifndef SCRYPT_H
 +  #define SCRYPT_H
 +  #include <stdlib.h>
 +  #include <stdint.h>
 +  
 +  static const int SCRYPT_SCRATCHPAD_SIZE = 131072      +   63;
 +  
 +  void scrypt_1024_1_1_256(const char *input, char *output);
 +  void scrypt_1024_1_1_256_sp_generic(const char *input, char *output, char *scratchpad);
 +  
 +  #if defined(USE_SSE2)
 +  #if defined(_M_X64) || defined(__x86_64__) || defined(_M_AMD64) || (defined(MAC_OSX) && defined(__i386__))
 +  #define USE_SSE2_ALWAYS 1
 +  #define scrypt_1024_1_1_256_sp(input, output, scratchpad) scrypt_1024_1_1_256_sp_sse2((input), (output), (scratchpad))
 +  #else
 +  #define scrypt_1024_1_1_256_sp(input, output, scratchpad) scrypt_1024_1_1_256_sp_detected((input), (output), (scratchpad))
 +  #endif
 +  
 +  void scrypt_detect_sse2();
 +  void scrypt_1024_1_1_256_sp_sse2(const char *input, char *output, char *scratchpad);
 +  extern void (*scrypt_1024_1_1_256_sp_detected)(const char *input, char *output, char *scratchpad);
 +  #else
 +  #define scrypt_1024_1_1_256_sp(input, output, scratchpad) scrypt_1024_1_1_256_sp_generic((input), (output), (scratchpad))
 +  #endif
 +  
 +  void
 +  PBKDF2_SHA256(const uint8_t *passwd, size_t passwdlen, const uint8_t *salt,
 +      size_t saltlen, uint64_t c, uint8_t *buf, size_t dkLen);
 +  
 +  static inline uint32_t le32dec(const void *pp)
 +  {
 +          const uint8_t *p = (uint8_t const *)pp;
 +          return ((uint32_t)(p[0])      +   ((uint32_t)(p[1]) << 8)      +  
 +              ((uint32_t)(p[2]) << 16)      +   ((uint32_t)(p[3]) << 24));
 +  }
 +  
 +  static inline void le32enc(void *pp, uint32_t x)
 +  {
 +          uint8_t *p = (uint8_t *)pp;
 +          p[0] = x & 0xff;
 +          p[1] = (x >> 8) & 0xff;
 +          p[2] = (x >> 16) & 0xff;
 +          p[3] = (x >> 24) & 0xff;
 +  }
 +  #endif

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/30516a6ce8d723cc3d8eb624e2d30431843f01a0

script.h

Commit 2

  - #include "bignum.h"

Include removed

       +class scriptnum_error : public std::runtime_error
   +{
   +public:
   +    explicit scriptnum_error(const std::string& str) : std::runtime_error(str) {}
   +};
   +
   +class CScriptNum
   +{
   +// Numeric opcodes (OP_1ADD, etc) are restricted to operating on 4-byte integers.
   +// The semantics are subtle, though: operands must be in the range [-2^31        +1...2^31 -1],
   +// but results may overflow (and are valid as long as they are not used in a subsequent
   +// numeric operation). CScriptNum enforces those semantics by storing results as
   +// an int64 and allowing out-of-range values to be returned as a vector of bytes but
   +// throwing an exception if arithmetic is done or the result is interpreted as an integer.
   +public:
   +
   +    explicit CScriptNum(const int64_t& n)
   +    {
   +        m_value = n;
   +    }
   +
   +    explicit CScriptNum(const std::vector<unsigned char>& vch)
   +    {
   +        if (vch.size() > nMaxNumSize)
   +            throw scriptnum_error("CScriptNum(const std::vector<unsigned char>&) : overflow");
   +        m_value = set_vch(vch);
   +    }
   +
   +    inline bool operator==(const int64_t& rhs) const    { return m_value == rhs; }
   +    inline bool operator!=(const int64_t& rhs) const    { return m_value != rhs; }
   +    inline bool operator<=(const int64_t& rhs) const    { return m_value <= rhs; }
   +    inline bool operator< (const int64_t& rhs) const    { return m_value <  rhs; }
   +    inline bool operator>=(const int64_t& rhs) const    { return m_value >= rhs; }
   +    inline bool operator> (const int64_t& rhs) const    { return m_value >  rhs; }
   +
   +    inline bool operator==(const CScriptNum& rhs) const { return operator==(rhs.m_value); }
   +    inline bool operator!=(const CScriptNum& rhs) const { return operator!=(rhs.m_value); }
   +    inline bool operator<=(const CScriptNum& rhs) const { return operator<=(rhs.m_value); }
   +    inline bool operator< (const CScriptNum& rhs) const { return operator< (rhs.m_value); }
   +    inline bool operator>=(const CScriptNum& rhs) const { return operator>=(rhs.m_value); }
   +    inline bool operator> (const CScriptNum& rhs) const { return operator> (rhs.m_value); }
   +
   +    inline CScriptNum operator       +(   const int64_t& rhs)    const { return CScriptNum(m_value        + rhs);}
   +    inline CScriptNum operator-(   const int64_t& rhs)    const { return CScriptNum(m_value - rhs);}
   +    inline CScriptNum operator       +(   const CScriptNum& rhs) const { return operator       +(rhs.m_value);   }
   +    inline CScriptNum operator-(   const CScriptNum& rhs) const { return operator-(rhs.m_value);   }
   +
   +    inline CScriptNum& operator       +=( const CScriptNum& rhs)       { return operator       +=(rhs.m_value);  }
   +    inline CScriptNum& operator-=( const CScriptNum& rhs)       { return operator-=(rhs.m_value);  }
   +
   +    inline CScriptNum operator-()                         const
   +    {
   +        assert(m_value != std::numeric_limits<int64_t>::min());
   +        return CScriptNum(-m_value);
   +    }
   +
   +    inline CScriptNum& operator=( const int64_t& rhs)
   +    {
   +        m_value = rhs;
   +        return *this;
   +    }
   +
   +    inline CScriptNum& operator       +=( const int64_t& rhs)
   +    {
   +        assert(rhs == 0 || (rhs > 0 && m_value <= std::numeric_limits<int64_t>::max() - rhs) ||
   +                           (rhs < 0 && m_value >= std::numeric_limits<int64_t>::min() - rhs));
   +        m_value        += rhs;
   +        return *this;
   +    }
   +
   +    inline CScriptNum& operator-=( const int64_t& rhs)
   +    {
   +        assert(rhs == 0 || (rhs > 0 && m_value >= std::numeric_limits<int64_t>::min()        + rhs) ||
   +                           (rhs < 0 && m_value <= std::numeric_limits<int64_t>::max()        + rhs));
   +        m_value -= rhs;
   +        return *this;
   +    }
   +
   +    int getint() const
   +    {
   +        if (m_value > std::numeric_limits<int>::max())
   +            return std::numeric_limits<int>::max();
   +        else if (m_value < std::numeric_limits<int>::min())
   +            return std::numeric_limits<int>::min();
   +        return m_value;
   +    }
   +
   +    std::vector<unsigned char> getvch() const
   +    {
   +        return serialize(m_value);
   +    }
   +
   +    static std::vector<unsigned char> serialize(const int64_t& value)
   +    {
   +        if(value == 0)
   +            return std::vector<unsigned char>();
   +
   +        std::vector<unsigned char> result;
   +        const bool neg = value < 0;
   +        uint64_t absvalue = neg ? -value : value;
   +
   +        while(absvalue)
   +        {
   +            result.push_back(absvalue & 0xff);
   +            absvalue >>= 8;
   +        }
   +
   +
   +//    - If the most significant byte is >= 0x80 and the value is positive, push a
   +//    new zero-byte to make the significant byte < 0x80 again.
   +
   +//    - If the most significant byte is >= 0x80 and the value is negative, push a
   +//    new 0x80 byte that will be popped off when converting to an integral.
   +
   +//    - If the most significant byte is < 0x80 and the value is negative, add
   +//    0x80 to it, since it will be subtracted and interpreted as a negative when
   +//    converting to an integral.
   +
   +        if (result.back() & 0x80)
   +            result.push_back(neg ? 0x80 : 0);
   +        else if (neg)
   +            result.back() |= 0x80;
   +
   +        return result;
   +    }
   +
   +    static const size_t nMaxNumSize = 4;
   +
   +private:
   +    static int64_t set_vch(const std::vector<unsigned char>& vch)
   +    {
   +      if (vch.empty())
   +          return 0;
   +
   +      int64_t result = 0;
   +      for (size_t i = 0; i != vch.size();        +       +i)
   +          result |= static_cast<int64_t>(vch[i]) << 8*i;
   +
   +      // If the input vector's most significant byte is 0x80, remove it from
   +      // the result's msb and return a negative.
   +      if (vch.back() & 0x80)
   +          return -(result & ~(0x80 << (8 * (vch.size() - 1))));
   +
   +      return result;
   +    }
   +
   +    int64_t m_value;
   +};
   +

Scrypt interface change

 +    SCRIPT_VERIFY_LOW_S     = (1U << 2), // enforce low S values (<n/2) in signatures (depends on STRICTENC)

 +    SCRIPT_VERIFY_NULLDUMMY = (1U << 4), // verify dummy stack item consumed by CHECKMULTISIG is of zero-length

Scrypt interface change Bitcoin code replaced.

+        return strprintf("%d", CScriptNum(vch).getint());

Print name interface change

-            CBigNum bn(n);
-            *this << bn.getvch();

   -
   -    CScript& push_uint64(uint64_t n)
   -    {
   -        if (n >= 1 && n <= 16)
   -        {
   -            push_back(n + (OP_1        - 1));
   -        }
   -        else
   -        {
   -            CBigNum bn(n);
   -            *this << bn.getvch();
   -        }
   -        return *this;
   -    }

Bitcoin code removed

+      *this << CScriptNum::serialize(n);

 +    CScript(int64_t b)        { operator<<(b); }

Scrypt interface included

   -    //explicit CScript(char b) is not portable.  Use 'signed char' or 'unsigned char'.
   -    explicit CScript(signed char b)        { operator<<(b); }
   -    explicit CScript(short b)              { operator<<(b); }
   -    explicit CScript(int b)                { operator<<(b); }
   -    explicit CScript(long b)               { operator<<(b); }
   -    explicit CScript(long long b)          { operator<<(b); }
   -    explicit CScript(unsigned char b)      { operator<<(b); }
   -    explicit CScript(unsigned int b)       { operator<<(b); }
   -    explicit CScript(unsigned short b)     { operator<<(b); }
   -    explicit CScript(unsigned long b)      { operator<<(b); }
   -    explicit CScript(unsigned long long b) { operator<<(b); }              -

Bitcoin code removed

  +    CScript(int64_t b)        { operator<<(b); }

Scrypt interface included

 -    explicit CScript(const CBigNum& b) { operator<<(b); }

Bitcoin code removed

 +    explicit CScript(const CScriptNum& b) { operator<<(b); }

+    CScript& operator<<(int64_t b) { return push_int64(b); }

Scrypt interface added

   -    //CScript& operator<<(char b) is not portable.  Use 'signed char' or 'unsigned char'.
   -    CScript& operator<<(signed char b)        { return push_int64(b); }
   -    CScript& operator<<(short b)              { return push_int64(b); }
   -    CScript& operator<<(int b)                { return push_int64(b); }
   -    CScript& operator<<(long b)               { return push_int64(b); }
   -    CScript& operator<<(long long b)          { return push_int64(b); }
   -    CScript& operator<<(unsigned char b)      { return push_uint64(b); }
   -    CScript& operator<<(unsigned int b)       { return push_uint64(b); }
   -    CScript& operator<<(unsigned short b)     { return push_uint64(b); }
   -    CScript& operator<<(unsigned long b)      { return push_uint64(b); }
   -    CScript& operator<<(unsigned long long b) { return push_uint64(b); } 

Bitcoin code removed

 +    CScript& operator<<(int64_t b) { return push_int64(b); }

 +    CScript& operator<<(const CScriptNum& b)

Scrypt interface added

[wrapper]

Feathercoin specific changes made to convert Bitcoin to FTC 0.9.6.*

https://github.com/FeatherCoin/Feathercoin/commit/900050b10fb9b56bea9d8dd664350a59adac73ab

scrypt-sse2.cpp

scrypt-sse2.cpp contains a number of Feathercoin settings , from Litecoin / Dogecoin? , for scrypt interface change Maintain separately / cherry pick?

Additional file to Bitcoin.

This could be specified as an alternate file at build time?

 +  /*
 +   * Copyright 2009 Colin Percival, 2011 ArtForz, 2012-2013 pooler
 +   * All rights reserved.
 +   *
 +   * Redistribution and use in source and binary forms, with or without
 +   * modification, are permitted provided that the following conditions
 +   * are met:
 +   * 1. Redistributions of source code must retain the above copyright
 +   *    notice, this list of conditions and the following disclaimer.
 +   * 2. Redistributions in binary form must reproduce the above copyright
 +   *    notice, this list of conditions and the following disclaimer in the
 +   *    documentation and/or other materials provided with the distribution.
 +   *
 +   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 +   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 +   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 +   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 +   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 +   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 +   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 +   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 +   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 +   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 +   * SUCH DAMAGE.
 +   *
 +   * This file was originally written by Colin Percival as part of the Tarsnap
 +   * online backup system.
 +   */
 +  
 +  // Copyright (c) 2013-2014 Dogecoin Developers
 +  
 +  #include "scrypt.h"
 +  #include <stdlib.h>
 +  #include <stdint.h>
 +  #include <string.h>
 +  #include <openssl/sha.h>
 +  
 +  #include <emmintrin.h>
 +  
 +  static inline void xor_salsa8_sse2(__m128i B[4], const __m128i Bx[4])
 +  {
 +  	__m128i X0, X1, X2, X3;
 +  	__m128i T;
 +  	int i;
 +  
 +  	X0 = B[0] = _mm_xor_si128(B[0], Bx[0]);
 +  	X1 = B[1] = _mm_xor_si128(B[1], Bx[1]);
 +  	X2 = B[2] = _mm_xor_si128(B[2], Bx[2]);
 +  	X3 = B[3] = _mm_xor_si128(B[3], Bx[3]);
 +  
 +  	for (i = 0; i < 8; i      +  = 2) {
 +  		/* Operate on "columns". */
 +  		T = _mm_add_epi32(X0, X3);
 +  		X1 = _mm_xor_si128(X1, _mm_slli_epi32(T, 7));
 +  		X1 = _mm_xor_si128(X1, _mm_srli_epi32(T, 25));
 +  		T = _mm_add_epi32(X1, X0);
 +  		X2 = _mm_xor_si128(X2, _mm_slli_epi32(T, 9));
 +  		X2 = _mm_xor_si128(X2, _mm_srli_epi32(T, 23));
 +  		T = _mm_add_epi32(X2, X1);
 +  		X3 = _mm_xor_si128(X3, _mm_slli_epi32(T, 13));
 +  		X3 = _mm_xor_si128(X3, _mm_srli_epi32(T, 19));
 +  		T = _mm_add_epi32(X3, X2);
 +  		X0 = _mm_xor_si128(X0, _mm_slli_epi32(T, 18));
 +  		X0 = _mm_xor_si128(X0, _mm_srli_epi32(T, 14));
 +  
 +  		/* Rearrange data. */
 +  		X1 = _mm_shuffle_epi32(X1, 0x93);
 +  		X2 = _mm_shuffle_epi32(X2, 0x4E);
 +  		X3 = _mm_shuffle_epi32(X3, 0x39);
 +  
 +  		/* Operate on "rows". */
 +  		T = _mm_add_epi32(X0, X1);
 +  		X3 = _mm_xor_si128(X3, _mm_slli_epi32(T, 7));
 +  		X3 = _mm_xor_si128(X3, _mm_srli_epi32(T, 25));
 +  		T = _mm_add_epi32(X3, X0);
 +  		X2 = _mm_xor_si128(X2, _mm_slli_epi32(T, 9));
 +  		X2 = _mm_xor_si128(X2, _mm_srli_epi32(T, 23));
 +  		T = _mm_add_epi32(X2, X3);
 +  		X1 = _mm_xor_si128(X1, _mm_slli_epi32(T, 13));
 +  		X1 = _mm_xor_si128(X1, _mm_srli_epi32(T, 19));
 +  		T = _mm_add_epi32(X1, X2);
 +  		X0 = _mm_xor_si128(X0, _mm_slli_epi32(T, 18));
 +  		X0 = _mm_xor_si128(X0, _mm_srli_epi32(T, 14));
 +  
 +  		/* Rearrange data. */
 +  		X1 = _mm_shuffle_epi32(X1, 0x39);
 +  		X2 = _mm_shuffle_epi32(X2, 0x4E);
 +  		X3 = _mm_shuffle_epi32(X3, 0x93);
 +  	}
 +  
 +  	B[0] = _mm_add_epi32(B[0], X0);
 +  	B[1] = _mm_add_epi32(B[1], X1);
 +  	B[2] = _mm_add_epi32(B[2], X2);
 +  	B[3] = _mm_add_epi32(B[3], X3);
 +  }
 +  
 +  void scrypt_1024_1_1_256_sp_sse2(const char *input, char *output, char *scratchpad)
 +  {
 +  	uint8_t B[128];
 +  	union {
 +  		__m128i i128[8];
 +  		uint32_t u32[32];
 +  	} X;
 +  	__m128i *V;
 +  	uint32_t i, j, k;
 +  
 +  	V = (__m128i *)(((uintptr_t)(scratchpad)      +   63) & ~ (uintptr_t)(63));
 +  
 +  	PBKDF2_SHA256((const uint8_t *)input, 80, (const uint8_t *)input, 80, 1, B, 128);
 +  
 +  	for (k = 0; k < 2; k     +       +  ) {
 +  		for (i = 0; i < 16; i     +       +  ) {
 +  			X.u32[k * 16      +   i] = le32dec(&B[(k * 16      +   (i * 5 % 16)) * 4]);
 +  		}
 +  	}
 +  
 +  	for (i = 0; i < 1024; i     +       +  ) {
 +  		for (k = 0; k < 8; k     +       +  )
 +  			V[i * 8      +   k] = X.i128[k];
 +  		xor_salsa8_sse2(&X.i128[0], &X.i128[4]);
 +  		xor_salsa8_sse2(&X.i128[4], &X.i128[0]);
 +  	}
 +  	for (i = 0; i < 1024; i     +       +  ) {
 +  		j = 8 * (X.u32[16] & 1023);
 +  		for (k = 0; k < 8; k     +       +  )
 +  			X.i128[k] = _mm_xor_si128(X.i128[k], V[j      +   k]);
 +  		xor_salsa8_sse2(&X.i128[0], &X.i128[4]);
 +  		xor_salsa8_sse2(&X.i128[4], &X.i128[0]);
 +  	}
 +  
 +  	for (k = 0; k < 2; k     +       +  ) {
 +  		for (i = 0; i < 16; i     +       +  ) {
 +  			le32enc(&B[(k * 16      +   (i * 5 % 16)) * 4], X.u32[k * 16      +   i]);
 +  		}
 +  	}
 +  
 +  	PBKDF2_SHA256((const uint8_t *)input, 80, B, 128, 1, (uint8_t *)output, 32);
 +  }