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/*
* Copyright (C) 2006-2009 Vincent Hanquez <vincent@snarc.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <string.h>
#include <stdio.h>
#include "bitfn.h"
#include "md4.h"
void md4_init(struct md4_ctx *ctx)
{
memset(ctx, 0, sizeof(*ctx));
ctx->sz = 0ULL;
ctx->h[0] = 0x67452301;
ctx->h[1] = 0xefcdab89;
ctx->h[2] = 0x98badcfe;
ctx->h[3] = 0x10325476;
}
#define f1(x, y, z) ((x & y) | ((~x) & z))
#define f2(x, y, z) ((x & y) | (x & z) | (y & z))
#define f3(x, y, z) (x ^ y ^ z)
#define K1 0x00000000
#define K2 0x5A827999
#define K3 0x6ED9EBA1
#define R(a,b,c,d,f,k,s,i) (a = rol32(a + f(b,c,d) + w[i] + k, s))
static void md4_do_chunk(struct md4_ctx *ctx, uint32_t *buf)
{
uint32_t a, b, c, d;
#ifdef ARCH_IS_BIG_ENDIAN
uint32_t w[16];
cpu_to_le32_array(w, (uint32_t *) buf, 16);
#else
uint32_t *w = buf;
#endif
a = ctx->h[0]; b = ctx->h[1]; c = ctx->h[2]; d = ctx->h[3];
R(a, b, c, d, f1, K1, 3, 0);
R(d, a, b, c, f1, K1, 7, 1);
R(c, d, a, b, f1, K1, 11, 2);
R(b, c, d, a, f1, K1, 19, 3);
R(a, b, c, d, f1, K1, 3, 4);
R(d, a, b, c, f1, K1, 7, 5);
R(c, d, a, b, f1, K1, 11, 6);
R(b, c, d, a, f1, K1, 19, 7);
R(a, b, c, d, f1, K1, 3, 8);
R(d, a, b, c, f1, K1, 7, 9);
R(c, d, a, b, f1, K1, 11, 10);
R(b, c, d, a, f1, K1, 19, 11);
R(a, b, c, d, f1, K1, 3, 12);
R(d, a, b, c, f1, K1, 7, 13);
R(c, d, a, b, f1, K1, 11, 14);
R(b, c, d, a, f1, K1, 19, 15);
R(a, b, c, d, f2, K2, 3, 0);
R(d, a, b, c, f2, K2, 5, 4);
R(c, d, a, b, f2, K2, 9, 8);
R(b, c, d, a, f2, K2, 13, 12);
R(a, b, c, d, f2, K2, 3, 1);
R(d, a, b, c, f2, K2, 5, 5);
R(c, d, a, b, f2, K2, 9, 9);
R(b, c, d, a, f2, K2, 13, 13);
R(a, b, c, d, f2, K2, 3, 2);
R(d, a, b, c, f2, K2, 5, 6);
R(c, d, a, b, f2, K2, 9, 10);
R(b, c, d, a, f2, K2, 13, 14);
R(a, b, c, d, f2, K2, 3, 3);
R(d, a, b, c, f2, K2, 5, 7);
R(c, d, a, b, f2, K2, 9, 11);
R(b, c, d, a, f2, K2, 13, 15);
R(a, b, c, d, f3, K3, 3, 0);
R(d, a, b, c, f3, K3, 9, 8);
R(c, d, a, b, f3, K3, 11, 4);
R(b, c, d, a, f3, K3, 15, 12);
R(a, b, c, d, f3, K3, 3, 2);
R(d, a, b, c, f3, K3, 9, 10);
R(c, d, a, b, f3, K3, 11, 6);
R(b, c, d, a, f3, K3, 15, 14);
R(a, b, c, d, f3, K3, 3, 1);
R(d, a, b, c, f3, K3, 9, 9);
R(c, d, a, b, f3, K3, 11, 5);
R(b, c, d, a, f3, K3, 15, 13);
R(a, b, c, d, f3, K3, 3, 3);
R(d, a, b, c, f3, K3, 9, 11);
R(c, d, a, b, f3, K3, 11, 7);
R(b, c, d, a, f3, K3, 15, 15);
ctx->h[0] += a; ctx->h[1] += b; ctx->h[2] += c; ctx->h[3] += d;
}
void md4_update(struct md4_ctx *ctx, uint8_t *data, uint32_t len)
{
uint32_t index, to_fill;
index = (uint32_t) (ctx->sz & 0x3f);
to_fill = 64 - index;
ctx->sz += len;
if (index && len >= to_fill) {
memcpy(ctx->buf + index, data, to_fill);
md4_do_chunk(ctx, (uint32_t *) ctx->buf);
len -= to_fill;
data += to_fill;
index = 0;
}
/* process as much 64-block as possible */
for (; len >= 64; len -= 64, data += 64)
md4_do_chunk(ctx, (uint32_t *) data);
/* append data into buf */
if (len)
memcpy(ctx->buf + index, data, len);
}
void md4_finalize(struct md4_ctx *ctx, uint8_t *out)
{
static uint8_t padding[64] = { 0x80, };
uint64_t bits;
uint32_t index, padlen;
/* add padding and update data with it */
bits = cpu_to_le64(ctx->sz << 3);
/* pad out to 56 */
index = (uint32_t) (ctx->sz & 0x3f);
padlen = (index < 56) ? (56 - index) : ((64 + 56) - index);
md4_update(ctx, padding, padlen);
/* append length */
md4_update(ctx, (uint8_t *) &bits, sizeof(bits));
/* output hash */
le32_to_cpu_array((uint32_t *) out, ctx->h, 4);
}
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