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//
// Creator:    http://www.dicelocksecurity.com
// Version:    vers.5.0.0.1
//
// Copyright © 2009-2011 DiceLock Security, LLC. All rights reserved.
//
//                               DISCLAIMER
//
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED 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
// REGENTS 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.
// 
// DICELOCK IS A REGISTERED TRADEMARK OR TRADEMARK OF THE OWNERS.
// 
 
#ifndef SHA256_HPP
 
#define SHA256_HPP
 
#ifdef DICELOCKCIPHER_EXPORTS
   #define CLASS_DECLSPEC    __declspec(dllexport)
#else
   #define CLASS_DECLSPEC    __declspec(dllimport)
#endif
 
#include "baseSha32.h"
 
 
#define SHA256_DIGESTBITS    256  // 256 hash bits
#define SHA256_DIGESTUCHARS  32   // 32  hash unsigned chars
#define SHA256_DIGESTUSHORTS 16   // 16  hash unsigned short ints
#define SHA256_DIGESTULONGS  8    // 8   hash unsigned long ints
 
#define SHA256_COMPUTECONSTANTS 64
 
#define SHA256_MESSAGESCHEDULE 64
 
#define SHA256_OPERATIONS 64
 
#define SHA256_RotateRight(x, n) (((x)>>(n)) | ((x)<<(32-(n))))
#define SHA256_ShiftRight(x, n) ((x)>>(n))
 
#define SHA256_SUM_0(x) (SHA256_RotateRight(x, 2) ^ SHA256_RotateRight(x, 13) ^ SHA256_RotateRight(x, 22))
#define SHA256_SUM_1(x) (SHA256_RotateRight(x, 6) ^ SHA256_RotateRight(x, 11) ^ SHA256_RotateRight(x, 25))
#define SHA256_SIG_0(x) (SHA256_RotateRight(x, 7) ^ SHA256_RotateRight(x, 18) ^ SHA256_ShiftRight(x, 3))
#define SHA256_SIG_1(x) (SHA256_RotateRight(x, 17) ^ SHA256_RotateRight(x, 19) ^ SHA256_ShiftRight(x, 10))
 
namespace DiceLockSecurity {
 
  namespace Hash {
 
  class Sha256 : public BaseSha32 {
 
    private:
 
      // Hash Algorithms Class enumerator name
      static const Hashes  hashName;
 
      // Number of hash bits
      static const unsigned short int hashBits;
      // Number of hash unsigned chars
      static const unsigned short int hashUCs;
      // Number of hash unsigned short ints
      static const unsigned short int hashUSs;
      // Number of hash unsigned long ints
      static const unsigned short int hashULs;
 
      // Number of schedule words
      static const unsigned short int scheduleNumber;
 
      // Initial hash values of SHA256 
      static const unsigned long int initials[SHA256_DIGESTULONGS];
 
      // Computational constant values of SHA256 
      static const unsigned long int constants[SHA256_COMPUTECONSTANTS];
 
      // Message schedule words for SHA256 
      unsigned long int messageSchedule[SHA256_MESSAGESCHEDULE];
 
    protected:
 
      // Computes the chunk block of information  
      CLASS_DECLSPEC void Compress(BaseCryptoRandomStream*, unsigned char*);
 
    public:
 
      // Constructor, default 
      CLASS_DECLSPEC Sha256();
 
      // Destructor
      CLASS_DECLSPEC ~Sha256();
 
      // Initializes common states of Sha1 algorithm
      CLASS_DECLSPEC void Initialize(void);
 
      // Finalizes hash and performs little endian transformation
      CLASS_DECLSPEC void Finalize(void);
 
      // Gets hash length in bits
      CLASS_DECLSPEC unsigned short int GetBitHashLength(void);
 
      // Gets hash length in unsigned chars
      CLASS_DECLSPEC unsigned short int GetUCHashLength(void);
 
      // Gets hash length in unsigned short ints
      CLASS_DECLSPEC unsigned short int GetUSHashLength(void);
 
      // Gets hash length in unsigned long ints
      CLASS_DECLSPEC unsigned short int GetULHashLength(void);
 
      // Gets the type of the object
      CLASS_DECLSPEC Hashes GetType(void);
  };
  }
}
 
#endif