3 * The MD5 hash function, described in RFC 1321.
6 /* nettle, low-level cryptographics library
8 * Copyright (C) 2001 Niels Möller
10 * The nettle library is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU Lesser General Public License as published by
12 * the Free Software Foundation; either version 2.1 of the License, or (at your
13 * option) any later version.
15 * The nettle library is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
18 * License for more details.
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with the nettle library; see the file COPYING.LIB. If not, write to
22 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
26 /* Based on public domain code hacked by Colin Plumb, Andrew Kuchling, and
39 #include "nettle-write.h"
42 md5_init(struct md5_ctx *ctx)
44 const uint32_t iv[_MD5_DIGEST_LENGTH] =
51 memcpy(ctx->state, iv, sizeof(ctx->state));
52 ctx->count_low = ctx->count_high = 0;
56 #define COMPRESS(ctx, data) (_nettle_md5_compress((ctx)->state, (data)))
59 md5_update(struct md5_ctx *ctx,
63 MD_UPDATE(ctx, length, data, COMPRESS, MD_INCR(ctx));
67 md5_digest(struct md5_ctx *ctx,
73 assert(length <= MD5_DIGEST_SIZE);
75 MD_PAD(ctx, 8, COMPRESS);
77 /* There are 512 = 2^9 bits in one block */
78 high = (ctx->count_high << 9) | (ctx->count_low >> 23);
79 low = (ctx->count_low << 9) | (ctx->index << 3);
81 LE_WRITE_UINT32(ctx->block + (MD5_DATA_SIZE - 8), low);
82 LE_WRITE_UINT32(ctx->block + (MD5_DATA_SIZE - 4), high);
83 _nettle_md5_compress(ctx->state, ctx->block);
85 _nettle_write_le32(length, digest, ctx->state);