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/*
* Sha1.h
*
* Copyright (C) 1998
* Paul E. Jones <paulej@acm.org>
* All Rights Reserved.
*
*****************************************************************************
* $Id: sha1.h,v 1.4 2001/03/20 06:25:06 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
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