mirror of git://git.gnupg.org/gnupg.git
162 lines
3.4 KiB
C
162 lines
3.4 KiB
C
/* md.c - message digest dispatcher
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* Copyright (c) 1997 by Werner Koch (dd9jn)
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*
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* This file is part of G10.
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*
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* G10 is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* G10 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "util.h"
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#include "cipher.h"
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#include "errors.h"
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/****************
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* Open a message digest handle for use with algorithm ALGO.
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* More algorithms may be added by md_enable(). The initial algorithm
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* may be 0.
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*/
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MD_HANDLE
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md_open( int algo, int secure )
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{
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MD_HANDLE hd;
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hd = secure ? m_alloc_secure_clear( sizeof *hd )
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: m_alloc_clear( sizeof *hd );
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if( algo )
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md_enable( hd, algo );
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return hd;
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}
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void
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md_enable( MD_HANDLE h, int algo )
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{
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if( algo == DIGEST_ALGO_MD5 ) {
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md5_init( &h->md5 );
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h->use_md5 = 1;
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}
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else if( algo == DIGEST_ALGO_RMD160 ) {
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rmd160_init( &h->rmd160 );
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h->use_rmd160 = 1;
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}
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else if( algo == DIGEST_ALGO_SHA1 ) {
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sha1_init( &h->sha1 );
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h->use_sha1 = 1;
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}
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else
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log_bug("md_enable(%d)", algo );
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}
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MD_HANDLE
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md_copy( MD_HANDLE a )
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{
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MD_HANDLE b;
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b = m_is_secure(a)? m_alloc_secure( sizeof *b )
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: m_alloc( sizeof *b );
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memcpy( b, a, sizeof *a );
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return b;
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}
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void
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md_close(MD_HANDLE a)
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{
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if( !a )
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return;
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m_free(a);
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}
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void
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md_write( MD_HANDLE a, byte *inbuf, size_t inlen)
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{
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if( a->use_rmd160 ) {
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rmd160_write( &a->rmd160, a->buffer, a->bufcount );
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rmd160_write( &a->rmd160, inbuf, inlen );
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}
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if( a->use_sha1 ) {
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sha1_write( &a->sha1, a->buffer, a->bufcount );
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sha1_write( &a->sha1, inbuf, inlen );
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}
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if( a->use_md5 ) {
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md5_write( &a->md5, a->buffer, a->bufcount );
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md5_write( &a->md5, inbuf, inlen );
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}
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a->bufcount = 0;
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}
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void
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md_final(MD_HANDLE a)
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{
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if( a->bufcount )
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md_write( a, NULL, 0 );
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if( a->use_rmd160 ) {
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byte *p;
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rmd160_final( &a->rmd160 );
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p = rmd160_read( &a->rmd160 );
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}
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if( a->use_sha1 )
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sha1_final( &a->sha1 );
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if( a->use_md5 )
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md5_final( &a->md5 );
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}
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/****************
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* if ALGO is null get the digest for the used algo (which should be only one)
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*/
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byte *
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md_read( MD_HANDLE a, int algo )
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{
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if( !algo ) {
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if( a->use_rmd160 )
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return rmd160_read( &a->rmd160 );
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if( a->use_sha1 )
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return sha1_read( &a->sha1 );
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if( a->use_md5 )
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return md5_read( &a->md5 );
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}
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else {
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if( algo == DIGEST_ALGO_RMD160 )
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return rmd160_read( &a->rmd160 );
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if( algo == DIGEST_ALGO_SHA1 )
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return sha1_read( &a->sha1 );
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if( algo == DIGEST_ALGO_MD5 )
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return md5_read( &a->md5 );
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}
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log_bug(NULL);
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}
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int
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md_get_algo( MD_HANDLE a )
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{
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if( a->use_rmd160 )
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return DIGEST_ALGO_RMD160;
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if( a->use_sha1 )
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return DIGEST_ALGO_SHA1;
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if( a->use_md5 )
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return DIGEST_ALGO_MD5;
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return 0;
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}
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