sha1.h

加密解密,安全工具！很有意思的代码

/*******************************************************************
 *
 *	Copyright (c) 1994-1999 Jetico, Inc., Finland
 *	All rights reserved.
 *
 *	File: sha1.h
 *	Revision:  $Id: sha1.h,v 1.2 2002/10/29 07:11:46 crypt Rel-1.6-3 $
 *	Created:
 *	Description: declaration of SHA-1 Secure Hash Algorithm 
 *		external procedures
 *
 *******************************************************************/

/*
 *	SHA1 message-digest algorithm.
 */

#ifndef __SHA1_H__
#define __SHA1_H__

#define SHA1_DIGEST_SIZE  		20

#define SHA1_ERROR_NO			0x0
#define SHA1_ERROR_INTERNAL_ERROR	0x1


typedef unsigned char byte;
typedef unsigned int  DWORD;

/* The structure for storing SHA context */

typedef struct SHA1Context_
{    DWORD digest[5];        /* Message digest */
     DWORD countLo, countHi; /* 64-bit byte count */
     DWORD data[16];         /* SHA data buffer */
} SHA1Context;

int SHA1Init(void   *context, 
             byte   *key, 
             size_t key_size);

int SHA1Process(void   *context, 
                byte   *data, 
                size_t length);

int SHA1Update(void *context, byte *data);

int SHA1Final(void *context, 
              byte *digest);

int SHA1Allocate(void **context);

int SHA1Free(void **context);

int SHA1MakeDigest( byte *message, int messageLength, byte *digest );


/* 
 * On the Intel processors Circular Shift Left operation 
 * (Rotation Left) may be done as one command for processor
 */

/* #define __INTEL_PLATFORM */

#ifdef __INTEL_PLATFORM
  #define ROL(X, n) _asm rol X, n
#else
  #define ROL( X, n )	( ( ( X ) << n ) | ( ( X ) >> ( 32 - n ) ) )
#endif


#endif /* __SHA1_H__ */