[linux.git] / crypto / md4.c

/* 
 * Cryptographic API.
 *
 * MD4 Message Digest Algorithm (RFC1320).
 *
 * Implementation derived from Andrew Tridgell and Steve French's
 * CIFS MD4 implementation, and the cryptoapi implementation
 * originally based on the public domain implementation written
 * by Colin Plumb in 1993.
 *
 * Copyright (c) Andrew Tridgell 1997-1998.
 * Modified by Steve French ([email protected]) 2002
 * Copyright (c) Cryptoapi developers.
 * Copyright (c) 2002 David S. Miller ([email protected])
 * Copyright (c) 2002 James Morris <[email protected]>
 *
 * This program 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.
 *
 */
#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/types.h>
#include <asm/byteorder.h>

#define MD4_DIGEST_SIZE		16
#define MD4_HMAC_BLOCK_SIZE	64
#define MD4_BLOCK_WORDS		16
#define MD4_HASH_WORDS		4

struct md4_ctx {
	u32 hash[MD4_HASH_WORDS];
	u32 block[MD4_BLOCK_WORDS];
	u64 byte_count;
};

static inline u32 lshift(u32 x, unsigned int s)
{
	x &= 0xFFFFFFFF;
	return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));
}

static inline u32 F(u32 x, u32 y, u32 z)
{
	return (x & y) | ((~x) & z);
}

static inline u32 G(u32 x, u32 y, u32 z)
{
	return (x & y) | (x & z) | (y & z);
}

static inline u32 H(u32 x, u32 y, u32 z)
{
	return x ^ y ^ z;
}

#define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s))
#define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (u32)0x5A827999,s))
#define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (u32)0x6ED9EBA1,s))

static void md4_transform(u32 *hash, u32 const *in)
{
	u32 a, b, c, d;

	a = hash[0];
	b = hash[1];
	c = hash[2];
	d = hash[3];

	ROUND1(a, b, c, d, in[0], 3);
	ROUND1(d, a, b, c, in[1], 7);
	ROUND1(c, d, a, b, in[2], 11);
	ROUND1(b, c, d, a, in[3], 19);
	ROUND1(a, b, c, d, in[4], 3);
	ROUND1(d, a, b, c, in[5], 7);
	ROUND1(c, d, a, b, in[6], 11);
	ROUND1(b, c, d, a, in[7], 19);
	ROUND1(a, b, c, d, in[8], 3);
	ROUND1(d, a, b, c, in[9], 7);
	ROUND1(c, d, a, b, in[10], 11);
	ROUND1(b, c, d, a, in[11], 19);
	ROUND1(a, b, c, d, in[12], 3);
	ROUND1(d, a, b, c, in[13], 7);
	ROUND1(c, d, a, b, in[14], 11);
	ROUND1(b, c, d, a, in[15], 19);

	ROUND2(a, b, c, d,in[ 0], 3);
	ROUND2(d, a, b, c, in[4], 5);
	ROUND2(c, d, a, b, in[8], 9);
	ROUND2(b, c, d, a, in[12], 13);
	ROUND2(a, b, c, d, in[1], 3);
	ROUND2(d, a, b, c, in[5], 5);
	ROUND2(c, d, a, b, in[9], 9);
	ROUND2(b, c, d, a, in[13], 13);
	ROUND2(a, b, c, d, in[2], 3);
	ROUND2(d, a, b, c, in[6], 5);
	ROUND2(c, d, a, b, in[10], 9);
	ROUND2(b, c, d, a, in[14], 13);
	ROUND2(a, b, c, d, in[3], 3);
	ROUND2(d, a, b, c, in[7], 5);
	ROUND2(c, d, a, b, in[11], 9);
	ROUND2(b, c, d, a, in[15], 13);

	ROUND3(a, b, c, d,in[ 0], 3);
	ROUND3(d, a, b, c, in[8], 9);
	ROUND3(c, d, a, b, in[4], 11);
	ROUND3(b, c, d, a, in[12], 15);
	ROUND3(a, b, c, d, in[2], 3);
	ROUND3(d, a, b, c, in[10], 9);
	ROUND3(c, d, a, b, in[6], 11);
	ROUND3(b, c, d, a, in[14], 15);
	ROUND3(a, b, c, d, in[1], 3);
	ROUND3(d, a, b, c, in[9], 9);
	ROUND3(c, d, a, b, in[5], 11);
	ROUND3(b, c, d, a, in[13], 15);
	ROUND3(a, b, c, d, in[3], 3);
	ROUND3(d, a, b, c, in[11], 9);
	ROUND3(c, d, a, b, in[7], 11);
	ROUND3(b, c, d, a, in[15], 15);

	hash[0] += a;
	hash[1] += b;
	hash[2] += c;
	hash[3] += d;
}

static inline void md4_transform_helper(struct md4_ctx *ctx)
{
	le32_to_cpu_array(ctx->block, ARRAY_SIZE(ctx->block));
	md4_transform(ctx->hash, ctx->block);
}

static int md4_init(struct shash_desc *desc)
{
	struct md4_ctx *mctx = shash_desc_ctx(desc);

	mctx->hash[0] = 0x67452301;
	mctx->hash[1] = 0xefcdab89;
	mctx->hash[2] = 0x98badcfe;
	mctx->hash[3] = 0x10325476;
	mctx->byte_count = 0;

	return 0;
}

static int md4_update(struct shash_desc *desc, const u8 *data, unsigned int len)
{
	struct md4_ctx *mctx = shash_desc_ctx(desc);
	const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);

	mctx->byte_count += len;

	if (avail > len) {
		memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
		       data, len);
		return 0;
	}

	memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
	       data, avail);

	md4_transform_helper(mctx);
	data += avail;
	len -= avail;

	while (len >= sizeof(mctx->block)) {
		memcpy(mctx->block, data, sizeof(mctx->block));
		md4_transform_helper(mctx);
		data += sizeof(mctx->block);
		len -= sizeof(mctx->block);
	}

	memcpy(mctx->block, data, len);

	return 0;
}

static int md4_final(struct shash_desc *desc, u8 *out)
{
	struct md4_ctx *mctx = shash_desc_ctx(desc);
	const unsigned int offset = mctx->byte_count & 0x3f;
	char *p = (char *)mctx->block + offset;
	int padding = 56 - (offset + 1);

	*p++ = 0x80;
	if (padding < 0) {
		memset(p, 0x00, padding + sizeof (u64));
		md4_transform_helper(mctx);
		p = (char *)mctx->block;
		padding = 56;
	}

	memset(p, 0, padding);
	mctx->block[14] = mctx->byte_count << 3;
	mctx->block[15] = mctx->byte_count >> 29;
	le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
	                  sizeof(u64)) / sizeof(u32));
	md4_transform(mctx->hash, mctx->block);
	cpu_to_le32_array(mctx->hash, ARRAY_SIZE(mctx->hash));
	memcpy(out, mctx->hash, sizeof(mctx->hash));
	memset(mctx, 0, sizeof(*mctx));

	return 0;
}

static struct shash_alg alg = {
	.digestsize	=	MD4_DIGEST_SIZE,
	.init		=	md4_init,
	.update		=	md4_update,
	.final		=	md4_final,
	.descsize	=	sizeof(struct md4_ctx),
	.base		=	{
		.cra_name	 =	"md4",
		.cra_driver_name =	"md4-generic",
		.cra_blocksize	 =	MD4_HMAC_BLOCK_SIZE,
		.cra_module	 =	THIS_MODULE,
	}
};

static int __init md4_mod_init(void)
{
	return crypto_register_shash(&alg);
}

static void __exit md4_mod_fini(void)
{
	crypto_unregister_shash(&alg);
}

subsys_initcall(md4_mod_init);
module_exit(md4_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MD4 Message Digest Algorithm");
MODULE_ALIAS_CRYPTO("md4");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Cryptographic API.
	3	*
	4	* MD4 Message Digest Algorithm (RFC1320).
	5	*
	6	* Implementation derived from Andrew Tridgell and Steve French's
	7	* CIFS MD4 implementation, and the cryptoapi implementation
	8	* originally based on the public domain implementation written
	9	* by Colin Plumb in 1993.
	10	*
	11	* Copyright (c) Andrew Tridgell 1997-1998.
	12	* Modified by Steve French ([email protected]) 2002
	13	* Copyright (c) Cryptoapi developers.
	14	* Copyright (c) 2002 David S. Miller ([email protected])
	15	* Copyright (c) 2002 James Morris <[email protected]>
	16	*
	17	* This program is free software; you can redistribute it and/or modify
	18	* it under the terms of the GNU General Public License as published by
	19	* the Free Software Foundation; either version 2 of the License, or
	20	* (at your option) any later version.
	21	*
	22	*/
808a1763	23	#include <crypto/internal/hash.h>
1da177e4	24	#include <linux/init.h>
1da177e4	25	#include <linux/kernel.h>
4bb33cc8	26	#include <linux/module.h>
1da177e4	27	#include <linux/string.h>
06ace7a9	28	#include <linux/types.h>
1da177e4 LT	29	#include <asm/byteorder.h>
	30
	31	#define MD4_DIGEST_SIZE 16
	32	#define MD4_HMAC_BLOCK_SIZE 64
	33	#define MD4_BLOCK_WORDS 16
	34	#define MD4_HASH_WORDS 4
	35
	36	struct md4_ctx {
	37	u32 hash[MD4_HASH_WORDS];
	38	u32 block[MD4_BLOCK_WORDS];
	39	u64 byte_count;
	40	};
	41
	42	static inline u32 lshift(u32 x, unsigned int s)
	43	{
	44	x &= 0xFFFFFFFF;
	45	return ((x << s) & 0xFFFFFFFF) \| (x >> (32 - s));
	46	}
	47
	48	static inline u32 F(u32 x, u32 y, u32 z)
	49	{
	50	return (x & y) \| ((~x) & z);
	51	}
	52
	53	static inline u32 G(u32 x, u32 y, u32 z)
	54	{
	55	return (x & y) \| (x & z) \| (y & z);
	56	}
	57
	58	static inline u32 H(u32 x, u32 y, u32 z)
	59	{
	60	return x ^ y ^ z;
	61	}
808a1763	62
1da177e4 LT	63	#define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s))
	64	#define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (u32)0x5A827999,s))
	65	#define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (u32)0x6ED9EBA1,s))
	66
1da177e4 LT	67	static void md4_transform(u32 hash, u32 const in)
	68	{
	69	u32 a, b, c, d;
	70
	71	a = hash[0];
	72	b = hash[1];
	73	c = hash[2];
	74	d = hash[3];
	75
	76	ROUND1(a, b, c, d, in[0], 3);
	77	ROUND1(d, a, b, c, in[1], 7);
	78	ROUND1(c, d, a, b, in[2], 11);
	79	ROUND1(b, c, d, a, in[3], 19);
	80	ROUND1(a, b, c, d, in[4], 3);
	81	ROUND1(d, a, b, c, in[5], 7);
	82	ROUND1(c, d, a, b, in[6], 11);
	83	ROUND1(b, c, d, a, in[7], 19);
	84	ROUND1(a, b, c, d, in[8], 3);
	85	ROUND1(d, a, b, c, in[9], 7);
	86	ROUND1(c, d, a, b, in[10], 11);
	87	ROUND1(b, c, d, a, in[11], 19);
	88	ROUND1(a, b, c, d, in[12], 3);
	89	ROUND1(d, a, b, c, in[13], 7);
	90	ROUND1(c, d, a, b, in[14], 11);
	91	ROUND1(b, c, d, a, in[15], 19);
	92
	93	ROUND2(a, b, c, d,in[ 0], 3);
	94	ROUND2(d, a, b, c, in[4], 5);
	95	ROUND2(c, d, a, b, in[8], 9);
	96	ROUND2(b, c, d, a, in[12], 13);
	97	ROUND2(a, b, c, d, in[1], 3);
	98	ROUND2(d, a, b, c, in[5], 5);
	99	ROUND2(c, d, a, b, in[9], 9);
	100	ROUND2(b, c, d, a, in[13], 13);
	101	ROUND2(a, b, c, d, in[2], 3);
	102	ROUND2(d, a, b, c, in[6], 5);
	103	ROUND2(c, d, a, b, in[10], 9);
	104	ROUND2(b, c, d, a, in[14], 13);
	105	ROUND2(a, b, c, d, in[3], 3);
	106	ROUND2(d, a, b, c, in[7], 5);
	107	ROUND2(c, d, a, b, in[11], 9);
	108	ROUND2(b, c, d, a, in[15], 13);
	109
	110	ROUND3(a, b, c, d,in[ 0], 3);
	111	ROUND3(d, a, b, c, in[8], 9);
	112	ROUND3(c, d, a, b, in[4], 11);
	113	ROUND3(b, c, d, a, in[12], 15);
	114	ROUND3(a, b, c, d, in[2], 3);
	115	ROUND3(d, a, b, c, in[10], 9);
	116	ROUND3(c, d, a, b, in[6], 11);
	117	ROUND3(b, c, d, a, in[14], 15);
	118	ROUND3(a, b, c, d, in[1], 3);
	119	ROUND3(d, a, b, c, in[9], 9);
	120	ROUND3(c, d, a, b, in[5], 11);
	121	ROUND3(b, c, d, a, in[13], 15);
	122	ROUND3(a, b, c, d, in[3], 3);
	123	ROUND3(d, a, b, c, in[11], 9);
	124	ROUND3(c, d, a, b, in[7], 11);
	125	ROUND3(b, c, d, a, in[15], 15);
	126
	127	hash[0] += a;
	128	hash[1] += b;
	129	hash[2] += c;
	130	hash[3] += d;
131	}
132
133	static inline void md4_transform_helper(struct md4_ctx *ctx)
134	{
31a61bfc	135	le32_to_cpu_array(ctx->block, ARRAY_SIZE(ctx->block));
1da177e4 LT	136	md4_transform(ctx->hash, ctx->block);
	137	}
	138
808a1763	139	static int md4_init(struct shash_desc *desc)
1da177e4	140	{
808a1763	141	struct md4_ctx *mctx = shash_desc_ctx(desc);
1da177e4 LT	142
	143	mctx->hash[0] = 0x67452301;
	144	mctx->hash[1] = 0xefcdab89;
	145	mctx->hash[2] = 0x98badcfe;
	146	mctx->hash[3] = 0x10325476;
	147	mctx->byte_count = 0;
808a1763 AKR	148
808a1763 AKR	149	return 0;
1da177e4 LT	150	}
1da177e4 LT	151
808a1763	152	static int md4_update(struct shash_desc desc, const u8 data, unsigned int len)
1da177e4	153	{
808a1763	154	struct md4_ctx *mctx = shash_desc_ctx(desc);
1da177e4 LT	155	const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
	156
	157	mctx->byte_count += len;
	158
	159	if (avail > len) {
	160	memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
	161	data, len);
808a1763	162	return 0;
1da177e4 LT	163	}
	164
	165	memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
	166	data, avail);
	167
	168	md4_transform_helper(mctx);
	169	data += avail;
	170	len -= avail;
	171
	172	while (len >= sizeof(mctx->block)) {
	173	memcpy(mctx->block, data, sizeof(mctx->block));
	174	md4_transform_helper(mctx);
	175	data += sizeof(mctx->block);
	176	len -= sizeof(mctx->block);
	177	}
	178
	179	memcpy(mctx->block, data, len);
808a1763 AKR	180
808a1763 AKR	181	return 0;
1da177e4 LT	182	}
1da177e4 LT	183
808a1763	184	static int md4_final(struct shash_desc desc, u8 out)
1da177e4	185	{
808a1763	186	struct md4_ctx *mctx = shash_desc_ctx(desc);
1da177e4 LT	187	const unsigned int offset = mctx->byte_count & 0x3f;
	188	char p = (char )mctx->block + offset;
	189	int padding = 56 - (offset + 1);
	190
	191	*p++ = 0x80;
	192	if (padding < 0) {
	193	memset(p, 0x00, padding + sizeof (u64));
	194	md4_transform_helper(mctx);
	195	p = (char *)mctx->block;
	196	padding = 56;
	197	}
	198
	199	memset(p, 0, padding);
	200	mctx->block[14] = mctx->byte_count << 3;
	201	mctx->block[15] = mctx->byte_count >> 29;
	202	le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
	203	sizeof(u64)) / sizeof(u32));
	204	md4_transform(mctx->hash, mctx->block);
31a61bfc	205	cpu_to_le32_array(mctx->hash, ARRAY_SIZE(mctx->hash));
1da177e4 LT	206	memcpy(out, mctx->hash, sizeof(mctx->hash));
1da177e4 LT	207	memset(mctx, 0, sizeof(*mctx));
808a1763 AKR	208
808a1763 AKR	209	return 0;
1da177e4 LT	210	}
1da177e4 LT	211
808a1763 AKR	212	static struct shash_alg alg = {
	213	.digestsize = MD4_DIGEST_SIZE,
	214	.init = md4_init,
	215	.update = md4_update,
	216	.final = md4_final,
	217	.descsize = sizeof(struct md4_ctx),
	218	.base = {
d6ebf528 EB	219	.cra_name = "md4",
	220	.cra_driver_name = "md4-generic",
	221	.cra_blocksize = MD4_HMAC_BLOCK_SIZE,
	222	.cra_module = THIS_MODULE,
808a1763	223	}
1da177e4 LT	224	};
1da177e4 LT	225
3af5b90b	226	static int __init md4_mod_init(void)
1da177e4	227	{
808a1763	228	return crypto_register_shash(&alg);
1da177e4 LT	229	}
1da177e4 LT	230
3af5b90b	231	static void __exit md4_mod_fini(void)
1da177e4	232	{
808a1763	233	crypto_unregister_shash(&alg);
1da177e4 LT	234	}
1da177e4 LT	235
c4741b23	236	subsys_initcall(md4_mod_init);
3af5b90b	237	module_exit(md4_mod_fini);
1da177e4 LT	238
	239	MODULE_LICENSE("GPL");
	240	MODULE_DESCRIPTION("MD4 Message Digest Algorithm");
5d26a105	241	MODULE_ALIAS_CRYPTO("md4");