topical media & game development

talk show tell print

lib-of-vs-libs-Poco-include-Poco-MD4Engine.h / h



  //
  // MD4Engine.h
  //
  // Id: //poco/1.3/Foundation/include/Poco/MD4Engine.h#2 
  //
  // Library: Foundation
  // Package: Crypt
  // Module:  MD4Engine
  //
  // Definition of class MD4Engine.
  //
  // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
  // and Contributors.
  //
  // Permission is hereby granted, free of charge, to any person or organization
  // obtaining a copy of the software and accompanying documentation covered by
  // this license (the "Software") to use, reproduce, display, distribute,
  // execute, and transmit the Software, and to prepare derivative works of the
  // Software, and to permit third-parties to whom the Software is furnished to
  // do so, all subject to the following:
  // 
  // The copyright notices in the Software and this entire statement, including
  // the above license grant, this restriction and the following disclaimer,
  // must be included in all copies of the Software, in whole or in part, and
  // all derivative works of the Software, unless such copies or derivative
  // works are solely in the form of machine-executable object code generated by
  // a source language processor.
  // 
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
  // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
  // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
  // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  // DEALINGS IN THE SOFTWARE.
  //
  //
  // MD4 (RFC 1320) algorithm:
  // Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
  // rights reserved.
  //
  // License to copy and use this software is granted provided that it
  // is identified as the "RSA Data Security, Inc. MD4 Message-Digest
  // Algorithm" in all material mentioning or referencing this software
  // or this function.
  //
  // License is also granted to make and use derivative works provided
  // that such works are identified as "derived from the RSA Data
  // Security, Inc. MD4 Message-Digest Algorithm" in all material
  // mentioning or referencing the derived work.
  //
  // RSA Data Security, Inc. makes no representations concerning either
  // the merchantability of this software or the suitability of this
  // software for any particular purpose. It is provided "as is"
  // without express or implied warranty of any kind.
  //
  // These notices must be retained in any copies of any part of this
  // documentation and/or software.
  //
  
  ifndef Foundation_MD4Engine_INCLUDED
  define Foundation_MD4Engine_INCLUDED
  
  include "Poco/Foundation.h"
  include "Poco/DigestEngine.h"
  
  namespace Poco {
  
  class Foundation_API MD4Engine: public DigestEngine
  
This class implementes the MD4 message digest algorithm, described in RFC 1320. { public: enum { BLOCK_SIZE = 64, DIGEST_SIZE = 16 };

          MD4Engine();
          ~MD4Engine();
                  
          unsigned digestLength() const;
          void reset();
          const DigestEngine::Digest& digest();
  
  protected:
          void updateImpl(const void* data, unsigned length);
  
  private:
          static void transform(UInt32 state[4], const unsigned char block[64]);
          static void encode(unsigned char* output, const UInt32* input, unsigned int len);
          static void decode(UInt32* output, const unsigned char* input, unsigned int len);
  
          struct Context
          {
                  UInt32 state[4];          // state (ABCD)
                  UInt32 count[2];          // number of bits, modulo 2^64 (lsb first)
                  unsigned char buffer[64]; // input buffer
          };
  
          Context _context;
          DigestEngine::Digest _digest;
  
          MD4Engine(const MD4Engine&);
          MD4Engine& operator = (const MD4Engine&);
  };
  
  } // namespace Poco
  
  endif // Foundation_MD5Engine_INCLUDED
  


(C) Æliens 04/09/2009

You may not copy or print any of this material without explicit permission of the author or the publisher. In case of other copyright issues, contact the author.