haval.h

计算文件hash值的源代码

/* Modified version of the HAVAL hash algorithm implementation
 * by Calyptix Security Corporation.
 * Use freely.
 *
 * Changes to the original version:
 * - Renamed some function and constants
 * - Added new include file to the haval.h header file
 * - Removed config.h from include directives
 */

/*  $Id: haval.h,v 1.2 2003/01/20 05:44:48 lteo Exp $ */

/*
 *  haval.h:  specifies the interface to the HAVAL (V.1) hashing library.
 *
 *  Copyright (c) 2003 Calyptix Security Corporation
 *  All rights reserved.
 *
 *  This code is derived from software contributed to Calyptix Security
 *  Corporation by Yuliang Zheng.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
 *  3. Neither the name of Calyptix Security Corporation nor the
 *     names of its contributors may be used to endorse or promote
 *     products derived from this software without specific prior
 *     written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * -------------------------------------------------------------------
 *
 *      HAVAL is a one-way hashing algorithm with the following
 *      collision-resistant property:
 *             It is computationally infeasible to find two or more
 *             messages that are hashed into the same fingerprint.
 *
 *  Reference:
 *       Y. Zheng, J. Pieprzyk and J. Seberry:
 *       ``HAVAL --- a one-way hashing algorithm with variable
 *       length of output'', Advances in Cryptology --- AUSCRYPT'92,
 *       Lecture Notes in Computer Science,  Vol.718, pp.83-104, 
 *       Springer-Verlag, 1993.
 *
 *      This library provides routines to hash
 *        -  a string,
 *        -  a file,
 *        -  input from the standard input device,
 *        -  a 32-word block, and
 *        -  a string of specified length.
 *
 *  Authors:    Yuliang Zheng and Lawrence Teo
 *              Calyptix Security Corporation
 *              P.O. Box 561508, Charlotte, NC 28213, USA
 *              Email: [e-mail]
 *              URL:   http://www.calyptix.com/
 *              Voice: [phone]
 *
 *  For a list of changes, see the ChangeLog file.
 */

#include "../rhsyscfg.h" /* Endian, hash function passes and fptlen */

typedef unsigned long int haval_word; /* a HAVAL word = 32 bits */

typedef struct {
  haval_word    count[2];                /* number of bits in a message */
  haval_word    fingerprint[8];          /* current state of fingerprint */    
  haval_word    block[32];               /* buffer for a 32-word block */ 
  unsigned char remainder[32*4];         /* unhashed chars (No.<128) */   
} haval_state;

void haval_string (char *, unsigned char *); /* hash a string */
int  haval_file (char *, unsigned char *);   /* hash a file */
void haval_stdin (void);                     /* filter -- hash input from stdin */
void haval_start (haval_state *);            /* initialization */
void haval_hash (haval_state *, unsigned char *,
                 unsigned int);              /* updating routine */
void haval_end (haval_state *, unsigned char *); /* finalization */
void haval_hash_block (haval_state *);       /* hash a 32-word block */