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Linus Tolke authoredLinus Tolke authored
md5.c 8.38 KiB
/* md5.c
*
* The MD5 hash function, described in RFC 1321.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2001 Niels Mller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
/* Based on public domain code hacked by Colin Plumb, Andrew Kuchling, and
* Niels Mller. */
#include "md5.h"
#include "macros.h"
#include <assert.h>
#include <string.h>
/* A block, treated as a sequence of 32-bit words. */
#define MD5_DATA_LENGTH 16
static void
md5_transform(uint32_t *digest, const uint32_t *data);
static void
md5_block(struct md5_ctx *ctx, const uint8_t *block);
void
md5_init(struct md5_ctx *ctx)
{
ctx->digest[0] = 0x67452301;
ctx->digest[1] = 0xefcdab89;
ctx->digest[2] = 0x98badcfe;
ctx->digest[3] = 0x10325476;
ctx->count_l = ctx->count_h = 0;
ctx->index = 0;
}
void
md5_update(struct md5_ctx *ctx,
unsigned length,
const uint8_t *data)
{
if (ctx->index)
{
/* Try to fill partial block */
unsigned left = MD5_DATA_SIZE - ctx->index;
if (length < left)
{
memcpy(ctx->block + ctx->index, data, length);
ctx->index += length;
return; /* Finished */