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// MD5.CC - source code for the C++/object oriented translation and  
//          modification of MD5. 
 
// Translation and modification (c) 1995 by Mordechai T. Abzug  
 
// This translation/ modification is provided "as is," without express or  
// implied warranty of any kind. 
 
// The translator/ modifier does not claim (1) that MD5 will do what you think  
// it does; (2) that this translation/ modification is accurate; or (3) that  
// this software is "merchantible."  (Language for this disclaimer partially  
// copied from the disclaimer below). 
 
/* based on: 
 
   MD5.H - header file for MD5C.C 
   MDDRIVER.C - test driver for MD2, MD4 and MD5 
 
   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. MD5 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. MD5 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 _MD5_H__ 
#define _MD5_H__ 
 
 
class MD5 { 
 
public: 
// methods for controlled operation: 
  MD5              ();  // simple initializer 
  void  update     (const unsigned char *input, unsigned int input_length); 
  void  update     (FILE *file); 
  void  finalize   (); 
 
// constructors for special circumstances.  All these constructors finalize 
// the MD5 context. 
  MD5              (const unsigned char *string, unsigned int len); // digest string, finalize 
  MD5              (FILE *file);            // digest file, close, finalize 
 
// methods to acquire finalized result 
  unsigned char    *raw_digest ();  // digest as a 16-byte binary array 
  char *            hex_digest ();  // digest as a 33-byte ascii-hex string 
 
 
 
private: 
 
// first, some types: 
  typedef unsigned       int uint4; // assumes integer is 4 words long 
  typedef unsigned short int uint2; // assumes short integer is 2 words long 
  typedef unsigned      char uint1; // assumes char is 1 word long 
 
// next, the private data: 
  uint4 state[4]; 
  uint4 count[2];     // number of *bits*, mod 2^64 
  uint1 buffer[64];   // input buffer 
  uint1 digest[16]; 
  uint1 finalized; 
 
// last, the private methods, mostly static: 
  void init             ();               // called by all constructors 
  void transform        (const uint1 *buffer);  // does the real update work.  Note  
                                          // that length is implied to be 64. 
 
  static void encode    (uint1 *dest, uint4 *src, uint4 length); 
  static void decode    (uint4 *dest, const uint1 *src, uint4 length); 
  static void memcpy    (uint1 *dest, const uint1 *src, uint4 length); 
  static void memset    (uint1 *start, uint1 val, uint4 length); 
 
  static inline uint4  rotate_left (uint4 x, uint4 n); 
  static inline uint4  F           (uint4 x, uint4 y, uint4 z); 
  static inline uint4  G           (uint4 x, uint4 y, uint4 z); 
  static inline uint4  H           (uint4 x, uint4 y, uint4 z); 
  static inline uint4  I           (uint4 x, uint4 y, uint4 z); 
  static inline void   FF  (uint4& a, uint4 b, uint4 c, uint4 d, uint4 x,  
			    uint4 s, uint4 ac); 
  static inline void   GG  (uint4& a, uint4 b, uint4 c, uint4 d, uint4 x,  
			    uint4 s, uint4 ac); 
  static inline void   HH  (uint4& a, uint4 b, uint4 c, uint4 d, uint4 x,  
			    uint4 s, uint4 ac); 
  static inline void   II  (uint4& a, uint4 b, uint4 c, uint4 d, uint4 x,  
			    uint4 s, uint4 ac); 
 
}; 
 
#endif