topical media & game development
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lib-of-vs-libs-Poco-include-Poco-SHA1Engine.h / h



  //
  // SHA1Engine.h
  //
  // Id: //poco/1.3/Foundation/include/Poco/SHA1Engine.h#2 
  //
  // Library: Foundation
  // Package: Crypt
  // Module:  SHA1Engine
  //
  // Definition of class SHA1Engine.
  //
  // Secure Hash Standard SHA-1 algorithm
  // (FIPS 180-1, see http://www.itl.nist.gov/fipspubs/fip180-1.htm)
  //
  // Based on the public domain implementation by Peter C. Gutmann
  // on 2 Sep 1992, modified by Carl Ellison to be SHA-1.
  //
  // 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.
  //
  
  ifndef Foundation_SHA1Engine_INCLUDED
  define Foundation_SHA1Engine_INCLUDED
  
  include "Poco/Foundation.h"
  include "Poco/DigestEngine.h"
  
  namespace Poco {
  
  class Foundation_API SHA1Engine: public DigestEngine
This class implementes the SHA-1 message digest algorithm. (FIPS 180-1, see http://www.itl.nist.gov/fipspubs/fip180-1.htm) { public: enum { BLOCK_SIZE = 64, DIGEST_SIZE = 20 }; 

          SHA1Engine();
          ~SHA1Engine();
                  
          unsigned digestLength() const;
          void reset();
          const DigestEngine::Digest& digest();
  
  protected:
          void updateImpl(const void* data, unsigned length);
  
  private:
          void transform();
          static void byteReverse(UInt32* buffer, int byteCount);
  
          typedef UInt8 BYTE;
  
          struct Context
          {
                  UInt32 digest[5]; // Message digest
                  UInt32 countLo;   // 64-bit bit count
                  UInt32 countHi;
                  UInt32 data[16];  // SHA data buffer
                  UInt32 slop;      // # of bytes saved in data[]
          };
  
          Context _context;
          DigestEngine::Digest _digest;
  
          SHA1Engine(const SHA1Engine&);
          SHA1Engine& operator = (const SHA1Engine&);
  };
  
  } // namespace Poco
  
  endif // Foundation_SHA1Engine_INCLUDED
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

(C) Æliens 04/09/2009

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