libresiprocate-1.9-dev 1.9.6-1 / usr / include / rutil / ssl / SHA1Stream.hxx

#if !defined(RESIP_SHA1STREAM_HXX)
#define RESIP_SHA1STREAM_HXX 

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

#include <iostream>
#include <memory>
#include <vector>
#include "rutil/Data.hxx"

// This will not be compiled or installed if USE_SSL isn't set. If you are 
// including this file from a source tree, and you are getting link errors, you 
// are probably trying to link against libs that were built without SSL support. 
// Either stop trying to use this file, or re-build the libs with ssl support 
// enabled.
//#if defined (USE_SSL)
//# include "openssl/sha.h"
//#else
//// !kh!
//// so it would compile without openssl.
//// also see my comment below.
//typedef int SHA_CTX;
//#endif // USE_SSL

# include "openssl/sha.h"

namespace resip
{

/** 
   @brief An implementation of std::streambuf used to back the SHA1Stream.
 */
class SHA1Buffer : public std::streambuf
{
   public:
      SHA1Buffer();
      virtual ~SHA1Buffer();
      /** @returns the SHA1 hexadecimal representation of the data from the buffer
       */
      Data getHex();
      /** 
          @param bits the lowest order bits in network byte order. bits must be
          multiple of 8
          @returns the SHA1 binary representation of the data from the buffer
       */
      Data getBin(unsigned int bits);

   protected:
      virtual int sync();
      virtual int overflow(int c = -1);
   private:
      // !kh!
      // used pointers to keep the same object layout.
      // this adds overhead, two additional new/delete.
      // could get rid of the overhead if, sizeof(SHA_CTX) and SHA_DIGEST_LENGTH are known and FIXED.
      // could use pimpl to get rid of one new/delete pair.
      std::auto_ptr<SHA_CTX> mContext;
      std::vector<char> mBuf;
      bool mBlown;
};

/** 
   @brief Used to accumlate data written to the stream in a SHA1Buffer and
    convert the data to SHA1.
 */
class SHA1Stream : private SHA1Buffer, public std::ostream
{
   public:
      SHA1Stream();
      ~SHA1Stream();
      /** Calls flush() on itself and returns the SHA1 data in hex format.
          @returns the SHA1 hexadecimal representation of the data written to the stream
       */
      Data getHex();
      /** Calls flush() on itself and returns the SHA1 data in binary format.
          @param bits the lowest order bits in network byte order. bits must be
          multiple of 8
          @returns the SHA1 binary representation of the data written to the stream
       */
      Data getBin(unsigned int bits=160);

      /** Calls getBin(32) and converts to a UInt32 */
      UInt32 getUInt32();
      
};

}

#endif
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