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/* md.c - message digest dispatcher
* Copyright (c) 1997 by Werner Koch (dd9jn)
*
* This file is part of G10.
*
* G10 is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* G10 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "util.h"
#include "cipher.h"
#include "errors.h"
/****************
* Open a message digest handle for use with algorithm ALGO.
* More algorithms may be added by md_enable(). The initial algorithm
* may be 0.
*/
MD_HANDLE
md_open( int algo, int secure )
{
MD_HANDLE hd;
hd = secure ? m_alloc_secure_clear( sizeof *hd )
: m_alloc_clear( sizeof *hd );
hd->secure = secure;
if( algo )
md_enable( hd, algo );
return hd;
}
void
md_enable( MD_HANDLE h, int algo )
{
if( algo == DIGEST_ALGO_MD5 ) {
md5_init( &h->md5 );
h->use_md5 = 1;
}
else if( algo == DIGEST_ALGO_RMD160 ) {
rmd160_init( &h->rmd160 );
h->use_rmd160 = 1;
}
else if( algo == DIGEST_ALGO_SHA1 ) {
sha1_init( &h->sha1 );
h->use_sha1 = 1;
}
else
log_bug("md_enable(%d)", algo );
}
MD_HANDLE
md_copy( MD_HANDLE a )
{
MD_HANDLE b;
b = a->secure ? m_alloc_secure( sizeof *b )
: m_alloc( sizeof *b );
memcpy( b, a, sizeof *a );
return b;
}
void
md_close(MD_HANDLE a)
{
if( !a )
return;
m_free(a);
}
void
md_write( MD_HANDLE a, byte *inbuf, size_t inlen)
{
if( a->debug ) {
if( a->bufcount && fwrite(a->buffer, a->bufcount, 1, a->debug ) != 1 )
BUG();
if( inlen && fwrite(inbuf, inlen, 1, a->debug ) != 1 )
BUG();
}
if( a->use_rmd160 ) {
rmd160_write( &a->rmd160, a->buffer, a->bufcount );
rmd160_write( &a->rmd160, inbuf, inlen );
}
if( a->use_sha1 ) {
sha1_write( &a->sha1, a->buffer, a->bufcount );
sha1_write( &a->sha1, inbuf, inlen );
}
if( a->use_md5 ) {
md5_write( &a->md5, a->buffer, a->bufcount );
md5_write( &a->md5, inbuf, inlen );
}
a->bufcount = 0;
}
void
md_final(MD_HANDLE a)
{
if( a->bufcount )
md_write( a, NULL, 0 );
if( a->use_rmd160 ) {
byte *p;
rmd160_final( &a->rmd160 );
p = rmd160_read( &a->rmd160 );
}
if( a->use_sha1 )
sha1_final( &a->sha1 );
if( a->use_md5 )
md5_final( &a->md5 );
}
/****************
* if ALGO is null get the digest for the used algo (which should be only one)
*/
byte *
md_read( MD_HANDLE a, int algo )
{
if( !algo ) {
if( a->use_rmd160 )
return rmd160_read( &a->rmd160 );
if( a->use_sha1 )
return sha1_read( &a->sha1 );
if( a->use_md5 )
return md5_read( &a->md5 );
}
else {
if( algo == DIGEST_ALGO_RMD160 )
return rmd160_read( &a->rmd160 );
if( algo == DIGEST_ALGO_SHA1 )
return sha1_read( &a->sha1 );
if( algo == DIGEST_ALGO_MD5 )
return md5_read( &a->md5 );
}
BUG();
}
int
md_get_algo( MD_HANDLE a )
{
if( a->use_rmd160 )
return DIGEST_ALGO_RMD160;
if( a->use_sha1 )
return DIGEST_ALGO_SHA1;
if( a->use_md5 )
return DIGEST_ALGO_MD5;
return 0;
}
const byte *
md_asn_oid( int algo, size_t *asnlen, size_t *mdlen )
{
size_t alen, mlen;
byte *p;
if( algo == DIGEST_ALGO_MD5 ) {
static byte asn[18] = /* Object ID is 1.2.840.113549.2.5 */
{ 0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 0x2a, 0x86,0x48,
0x86, 0xf7, 0x0d, 0x02, 0x05, 0x05, 0x00, 0x04, 0x10 };
mlen = 16; alen = DIM(asn); p = asn;
}
else if( algo == DIGEST_ALGO_RMD160 ) {
static byte asn[15] = /* Object ID is 1.3.36.3.2.1 */
{ 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x24, 0x03,
0x02, 0x01, 0x05, 0x00, 0x04, 0x14 };
mlen = 20; alen = DIM(asn); p = asn;
}
else if( algo == DIGEST_ALGO_SHA1 ) {
static byte asn[15] = /* Objet ID is 1.3.14.3.2.26 */
{ 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03,
0x02, 0x1a, 0x05, 0x00, 0x04, 0x14 };
mlen = 20; alen = DIM(asn); p = asn;
}
else
log_bug("md_asn_oid(%d)", algo );
if( asnlen )
*asnlen = alen;
if( mdlen )
*mdlen = mlen;
return p;
}
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