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/* md5.c
*
* The MD5 hash function, described in RFC 1321.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2001 Niels Möller
*
* 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 Möller. */
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <string.h>
#include "md5.h"
#include "macros.h"
#include "nettle-write.h"
void
md5_init(struct md5_ctx *ctx)
{
const uint32_t iv[_MD5_DIGEST_LENGTH] =
{
0x67452301,
0xefcdab89,
0x98badcfe,
0x10325476,
};
memcpy(ctx->state, iv, sizeof(ctx->state));
ctx->count_low = ctx->count_high = 0;
ctx->index = 0;
}
#define COMPRESS(ctx, data) (_nettle_md5_compress((ctx)->state, (data)))
void
md5_update(struct md5_ctx *ctx,
unsigned length,
const uint8_t *data)
{
MD_UPDATE(ctx, length, data, COMPRESS, MD_INCR(ctx));
}
void
md5_digest(struct md5_ctx *ctx,
unsigned length,
uint8_t *digest)
{
uint32_t high, low;
assert(length <= MD5_DIGEST_SIZE);
MD_PAD(ctx, 8, COMPRESS);
/* There are 512 = 2^9 bits in one block */
high = (ctx->count_high << 9) | (ctx->count_low >> 23);
low = (ctx->count_low << 9) | (ctx->index << 3);
LE_WRITE_UINT32(ctx->block + (MD5_DATA_SIZE - 8), low);
LE_WRITE_UINT32(ctx->block + (MD5_DATA_SIZE - 4), high);
_nettle_md5_compress(ctx->state, ctx->block);
_nettle_write_le32(length, digest, ctx->state);
md5_init(ctx);
}
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