www.pudn.com > sha1.zip > sha1.h

/* 
 *	sha1.h 
 * 
 *	Copyright (C) 1998 
 *	Paul E. Jones  
 *	All Rights Reserved. 
 * 
 ***************************************************************************** 
 *	$Id: sha1.h,v 1.6 2004/03/27 18:02:26 paulej Exp $ 
 ***************************************************************************** 
 * 
 *	Description: 
 * 		This class implements the Secure Hashing Standard as defined 
 * 		in FIPS PUB 180-1 published April 17, 1995. 
 * 
 *		Many of the variable names in this class, especially the single 
 *		character names, were used because those were the names used 
 *		in the publication. 
 * 
 * 		Please read the file sha1.cpp for more information. 
 * 
 */ 
 
#ifndef _SHA1_H_ 
#define _SHA1_H_ 
 
class SHA1 
{ 
 
	public: 
 
		SHA1(); 
		virtual ~SHA1(); 
 
		/* 
		 *	Re-initialize the class 
		 */ 
		void Reset(); 
 
		/* 
		 *	Returns the message digest 
		 */ 
		bool Result(unsigned *message_digest_array); 
 
		/* 
		 *	Provide input to SHA1 
		 */ 
		void Input(	const unsigned char	*message_array, 
					unsigned			length); 
		void Input(	const char	*message_array, 
					unsigned	length); 
		void Input(unsigned char message_element); 
		void Input(char message_element); 
		SHA1& operator<<(const char *message_array); 
		SHA1& operator<<(const unsigned char *message_array); 
		SHA1& operator<<(const char message_element); 
		SHA1& operator<<(const unsigned char message_element); 
 
	private: 
 
		/* 
		 *	Process the next 512 bits of the message 
		 */ 
		void ProcessMessageBlock(); 
 
		/* 
		 *	Pads the current message block to 512 bits 
		 */ 
		void PadMessage(); 
 
		/* 
		 *	Performs a circular left shift operation 
		 */ 
		inline unsigned CircularShift(int bits, unsigned word); 
 
		unsigned H[5];						// Message digest buffers 
 
		unsigned Length_Low;				// Message length in bits 
		unsigned Length_High;				// Message length in bits 
 
		unsigned char Message_Block[64];	// 512-bit message blocks 
		int Message_Block_Index;			// Index into message block array 
 
		bool Computed;						// Is the digest computed? 
		bool Corrupted;						// Is the message digest corruped? 
	 
}; 
 
#endif