
#include <cstddef>
#include <cstring>
#include <new>
#include <stdexcept>
#include <algorithm>
#include "rutil/ResipAssert.h"

#if defined(HAVE_CONFIG_H)
  #include "config.h"
#endif

#include "rutil/Socket.hxx"  // for ntohl under windows
#include "rutil/WinLeakCheck.hxx"

#if defined(USE_SSL)
#include "rutil/ssl/SHA1Stream.hxx"

#include "openssl/evp.h"

// Remove warning about 'this' use in initiator list - pointer is only stored
# if defined(WIN32) && !defined(__GNUC__)
#   pragma warning( disable : 4355 ) // using this in base member initializer list 
# endif // WIN32

using namespace resip;

SHA1Buffer::SHA1Buffer()
        : mBlown(false)
{
   std::memset(mBuf, 0, sizeof(mBuf));
   setp(mBuf, mBuf + sizeof(mBuf));

   mContext.reset(EVP_MD_CTX_new());
   if (!mContext)
      throw std::bad_alloc();
   int res = EVP_DigestInit_ex(mContext.get(), EVP_sha1(), NULL);
   if (!res)
      throw std::runtime_error("Failed to initialize SHA1 context");
}

SHA1Buffer::~SHA1Buffer()
{
}

int
SHA1Buffer::sync()
{
   std::size_t len = pptr() - pbase();
   if (len > 0)
   {
      EVP_DigestUpdate(mContext.get(), reinterpret_cast<unsigned const char*>(pbase()), len);
      // reset the put buffer
      setp(mBuf, mBuf + sizeof(mBuf));
   }
   return 0;
}

int
SHA1Buffer::overflow(int c)
{
   sync();
   if (c != -1)
   {
      mBuf[0] = c;
      pbump(1);
      return c;
   }
   return 0;
}

Data
SHA1Buffer::getHex()
{
   resip_assert(mBlown == false);
   unsigned char md_value[EVP_MAX_MD_SIZE];
   unsigned int md_len = 0u;
   EVP_DigestFinal_ex(mContext.get(), md_value, &md_len);
   mBlown = true;
   Data digest(Data::Share, reinterpret_cast<const char*>(md_value), md_len);
   return digest.hex();
}

Data
SHA1Buffer::getBin(unsigned int bits)
{
   resip_assert(mBlown == false);
   resip_assert(bits % 8 == 0);
   resip_assert(bits / 8 <= EVP_MAX_MD_SIZE);
   unsigned char md_value[EVP_MAX_MD_SIZE];
   unsigned int md_len = 0u;
   EVP_DigestFinal_ex(mContext.get(), md_value, &md_len);
   mBlown = true;
   unsigned int len = std::min(bits / 8u, md_len);
   return Data(md_value + (md_len - len), len);
}

SHA1Stream::SHA1Stream()
   : std::ostream(this)
{
}

SHA1Stream::~SHA1Stream()
{}

Data 
SHA1Stream::getHex()
{
   flush();
   return SHA1Buffer::getHex();
   //return mStreambuf.getHex();
}

Data
SHA1Stream::getBin(unsigned int bits)
{
   flush();
   return SHA1Buffer::getBin(bits);
}

uint32_t
SHA1Stream::getUInt32()
{
   flush();
   uint32_t input = *((uint32_t*)getBin(32).c_str());
   return ntohl(input);
}


#endif // USE_SSL

/* ====================================================================
 * The Vovida Software License, Version 1.0 
 * 
 * Copyright (c) 2000 Vovida Networks, Inc.  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.
 * 
 * 3. The names "VOCAL", "Vovida Open Communication Application Library",
 *    and "Vovida Open Communication Application Library (VOCAL)" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact vocal@vovida.org.
 *
 * 4. Products derived from this software may not be called "VOCAL", nor
 *    may "VOCAL" appear in their name, without prior written
 *    permission of Vovida Networks, Inc.
 * 
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND
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 * IN EXCESS OF $1,000, NOR FOR ANY 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 software consists of voluntary contributions made by Vovida
 * Networks, Inc. and many individuals on behalf of Vovida Networks,
 * Inc.  For more information on Vovida Networks, Inc., please see
 * <http://www.vovida.org/>.
 *
 */
