Source file: src/sha1.h
/*
This software is licensed as "freeware." Permission to distribute
this software in source and binary forms is hereby granted without
a fee. THIS SOFTWARE IS PROVIDED 'AS IS' AND WITHOUT ANY EXPRESSED
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
THE AUTHOR SHALL NOT BE HELD LIABLE FOR ANY DAMAGES RESULTING
FROM THE USE OF THIS SOFTWARE, EITHER DIRECTLY OR INDIRECTLY, INCLUDING,
BUT NOT LIMITED TO, LOSS OF DATA OR DATA BEING RENDERED INACCURATE.
*/
/*
* sha1.h
*
* Copyright (C) 1998
* Paul E. Jones <paulej@arid.us>
* 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
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