[linux.git] / crypto / md5.c

/* 
 * Cryptographic API.
 *
 * MD5 Message Digest Algorithm (RFC1321).
 *
 * Derived from cryptoapi implementation, originally based on the
 * public domain implementation written by Colin Plumb in 1993.
 *
 * Copyright (c) Cryptoapi developers.
 * 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 <crypto/md5.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/types.h>
#include <asm/byteorder.h>

#define F1(x, y, z)	(z ^ (x & (y ^ z)))
#define F2(x, y, z)	F1(z, x, y)
#define F3(x, y, z)	(x ^ y ^ z)
#define F4(x, y, z)	(y ^ (x | ~z))

#define MD5STEP(f, w, x, y, z, in, s) \
	(w += f(x, y, z) + in, w = (w<<s | w>>(32-s)) + x)

static void md5_transform(u32 *hash, u32 const *in)
{
	u32 a, b, c, d;

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

	MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
	MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
	MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
	MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
	MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
	MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
	MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
	MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
	MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
	MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
	MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
	MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
	MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
	MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
	MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
	MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);

	MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
	MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
	MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
	MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
	MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
	MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
	MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
	MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
	MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
	MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
	MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
	MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
	MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
	MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
	MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
	MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);

	MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
	MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
	MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
	MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
	MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
	MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
	MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
	MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
	MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
	MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
	MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
	MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
	MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
	MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
	MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
	MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);

	MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
	MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
	MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
	MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
	MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
	MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
	MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
	MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
	MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
	MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
	MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
	MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
	MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
	MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
	MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
	MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);

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

/* XXX: this stuff can be optimized */
static inline void le32_to_cpu_array(u32 *buf, unsigned int words)
{
	while (words--) {
		__le32_to_cpus(buf);
		buf++;
	}
}

static inline void cpu_to_le32_array(u32 *buf, unsigned int words)
{
	while (words--) {
		__cpu_to_le32s(buf);
		buf++;
	}
}

static inline void md5_transform_helper(struct md5_state *ctx)
{
	le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
	md5_transform(ctx->hash, ctx->block);
}

static int md5_init(struct shash_desc *desc)
{
	struct md5_state *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 md5_update(struct shash_desc *desc, const u8 *data, unsigned int len)
{
	struct md5_state *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);

	md5_transform_helper(mctx);
	data += avail;
	len -= avail;

	while (len >= sizeof(mctx->block)) {
		memcpy(mctx->block, data, sizeof(mctx->block));
		md5_transform_helper(mctx);
		data += sizeof(mctx->block);
		len -= sizeof(mctx->block);
	}

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

	return 0;
}

static int md5_final(struct shash_desc *desc, u8 *out)
{
	struct md5_state *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));
		md5_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));
	md5_transform(mctx->hash, mctx->block);
	cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32));
	memcpy(out, mctx->hash, sizeof(mctx->hash));
	memset(mctx, 0, sizeof(*mctx));

	return 0;
}

static int md5_export(struct shash_desc *desc, void *out)
{
	struct md5_state *ctx = shash_desc_ctx(desc);

	memcpy(out, ctx, sizeof(*ctx));
	return 0;
}

static int md5_import(struct shash_desc *desc, const void *in)
{
	struct md5_state *ctx = shash_desc_ctx(desc);

	memcpy(ctx, in, sizeof(*ctx));
	return 0;
}

static struct shash_alg alg = {
	.digestsize	=	MD5_DIGEST_SIZE,
	.init		=	md5_init,
	.update		=	md5_update,
	.final		=	md5_final,
	.export		=	md5_export,
	.import		=	md5_import,
	.descsize	=	sizeof(struct md5_state),
	.statesize	=	sizeof(struct md5_state),
	.base		=	{
		.cra_name	=	"md5",
		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
		.cra_blocksize	=	MD5_HMAC_BLOCK_SIZE,
		.cra_module	=	THIS_MODULE,
	}
};

static int __init md5_mod_init(void)
{
	return crypto_register_shash(&alg);
}

static void __exit md5_mod_fini(void)
{
	crypto_unregister_shash(&alg);
}

module_init(md5_mod_init);
module_exit(md5_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MD5 Message Digest Algorithm");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Cryptographic API.
	3	*
	4	* MD5 Message Digest Algorithm (RFC1321).
	5	*
	6	* Derived from cryptoapi implementation, originally based on the
	7	* public domain implementation written by Colin Plumb in 1993.
	8	*
	9	* Copyright (c) Cryptoapi developers.
	10	* Copyright (c) 2002 James Morris <[email protected]>
	11	*
	12	* This program is free software; you can redistribute it and/or modify it
	13	* under the terms of the GNU General Public License as published by the Free
	14	* Software Foundation; either version 2 of the License, or (at your option)
	15	* any later version.
	16	*
	17	*/
14b75ba7	18	#include <crypto/internal/hash.h>
7d6f75eb	19	#include <crypto/md5.h>
1da177e4 LT	20	#include <linux/init.h>
	21	#include <linux/module.h>
	22	#include <linux/string.h>
06ace7a9	23	#include <linux/types.h>
1da177e4 LT	24	#include <asm/byteorder.h>
1da177e4 LT	25
1da177e4 LT	26	#define F1(x, y, z) (z ^ (x & (y ^ z)))
	27	#define F2(x, y, z) F1(z, x, y)
	28	#define F3(x, y, z) (x ^ y ^ z)
	29	#define F4(x, y, z) (y ^ (x \| ~z))
	30
	31	#define MD5STEP(f, w, x, y, z, in, s) \
	32	(w += f(x, y, z) + in, w = (w<<s \| w>>(32-s)) + x)
	33
1da177e4 LT	34	static void md5_transform(u32 hash, u32 const in)
	35	{
	36	u32 a, b, c, d;
	37
	38	a = hash[0];
	39	b = hash[1];
	40	c = hash[2];
	41	d = hash[3];
	42
	43	MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
	44	MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
	45	MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
	46	MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
	47	MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
	48	MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
	49	MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
	50	MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
	51	MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
	52	MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
	53	MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
	54	MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
	55	MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
	56	MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
	57	MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
	58	MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
	59
	60	MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
	61	MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
	62	MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
	63	MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
	64	MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
	65	MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
	66	MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
	67	MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
	68	MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
	69	MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
	70	MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
	71	MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
	72	MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
	73	MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
	74	MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
	75	MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
	76
	77	MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
	78	MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
	79	MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
	80	MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
	81	MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
	82	MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
	83	MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
	84	MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
	85	MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
	86	MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
	87	MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
	88	MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
	89	MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
	90	MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
	91	MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
	92	MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
	93
	94	MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
	95	MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
	96	MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
	97	MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
98	MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
99	MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
100	MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
101	MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
102	MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
103	MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
104	MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
105	MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
106	MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
107	MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
108	MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
109	MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
110
111	hash[0] += a;
112	hash[1] += b;
113	hash[2] += c;
114	hash[3] += d;
115	}
116
117	/* XXX: this stuff can be optimized */
118	static inline void le32_to_cpu_array(u32 *buf, unsigned int words)
119	{
120	while (words--) {
121	__le32_to_cpus(buf);
122	buf++;
123	}
124	}
125
126	static inline void cpu_to_le32_array(u32 *buf, unsigned int words)
127	{
128	while (words--) {
129	__cpu_to_le32s(buf);
130	buf++;
131	}
132	}
133
7d6f75eb	134	static inline void md5_transform_helper(struct md5_state *ctx)
1da177e4 LT	135	{
	136	le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
	137	md5_transform(ctx->hash, ctx->block);
	138	}
	139
14b75ba7	140	static int md5_init(struct shash_desc *desc)
1da177e4	141	{
7d6f75eb	142	struct md5_state *mctx = shash_desc_ctx(desc);
1da177e4 LT	143
	144	mctx->hash[0] = 0x67452301;
	145	mctx->hash[1] = 0xefcdab89;
	146	mctx->hash[2] = 0x98badcfe;
	147	mctx->hash[3] = 0x10325476;
	148	mctx->byte_count = 0;
14b75ba7 AKR	149
14b75ba7 AKR	150	return 0;
1da177e4 LT	151	}
1da177e4 LT	152
14b75ba7	153	static int md5_update(struct shash_desc desc, const u8 data, unsigned int len)
1da177e4	154	{
7d6f75eb	155	struct md5_state *mctx = shash_desc_ctx(desc);
1da177e4 LT	156	const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
	157
	158	mctx->byte_count += len;
	159
	160	if (avail > len) {
	161	memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
	162	data, len);
14b75ba7	163	return 0;
1da177e4 LT	164	}
	165
	166	memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
	167	data, avail);
	168
	169	md5_transform_helper(mctx);
	170	data += avail;
	171	len -= avail;
	172
	173	while (len >= sizeof(mctx->block)) {
	174	memcpy(mctx->block, data, sizeof(mctx->block));
	175	md5_transform_helper(mctx);
	176	data += sizeof(mctx->block);
	177	len -= sizeof(mctx->block);
	178	}
	179
	180	memcpy(mctx->block, data, len);
14b75ba7 AKR	181
14b75ba7 AKR	182	return 0;
1da177e4 LT	183	}
1da177e4 LT	184
14b75ba7	185	static int md5_final(struct shash_desc desc, u8 out)
1da177e4	186	{
7d6f75eb	187	struct md5_state *mctx = shash_desc_ctx(desc);
1da177e4 LT	188	const unsigned int offset = mctx->byte_count & 0x3f;
	189	char p = (char )mctx->block + offset;
	190	int padding = 56 - (offset + 1);
	191
	192	*p++ = 0x80;
	193	if (padding < 0) {
	194	memset(p, 0x00, padding + sizeof (u64));
	195	md5_transform_helper(mctx);
	196	p = (char *)mctx->block;
	197	padding = 56;
	198	}
	199
	200	memset(p, 0, padding);
	201	mctx->block[14] = mctx->byte_count << 3;
	202	mctx->block[15] = mctx->byte_count >> 29;
	203	le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
	204	sizeof(u64)) / sizeof(u32));
	205	md5_transform(mctx->hash, mctx->block);
	206	cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32));
	207	memcpy(out, mctx->hash, sizeof(mctx->hash));
	208	memset(mctx, 0, sizeof(*mctx));
14b75ba7 AKR	209
14b75ba7 AKR	210	return 0;
1da177e4 LT	211	}
1da177e4 LT	212
7d6f75eb MV	213	static int md5_export(struct shash_desc desc, void out)
	214	{
	215	struct md5_state *ctx = shash_desc_ctx(desc);
	216
	217	memcpy(out, ctx, sizeof(*ctx));
	218	return 0;
	219	}
	220
	221	static int md5_import(struct shash_desc desc, const void in)
	222	{
	223	struct md5_state *ctx = shash_desc_ctx(desc);
	224
	225	memcpy(ctx, in, sizeof(*ctx));
	226	return 0;
	227	}
	228
14b75ba7 AKR	229	static struct shash_alg alg = {
	230	.digestsize = MD5_DIGEST_SIZE,
	231	.init = md5_init,
	232	.update = md5_update,
	233	.final = md5_final,
7d6f75eb MV	234	.export = md5_export,
	235	.import = md5_import,
	236	.descsize = sizeof(struct md5_state),
eebb111f	237	.statesize = sizeof(struct md5_state),
14b75ba7 AKR	238	.base = {
	239	.cra_name = "md5",
	240	.cra_flags = CRYPTO_ALG_TYPE_SHASH,
	241	.cra_blocksize = MD5_HMAC_BLOCK_SIZE,
	242	.cra_module = THIS_MODULE,
	243	}
1da177e4 LT	244	};
1da177e4 LT	245
3af5b90b	246	static int __init md5_mod_init(void)
1da177e4	247	{
14b75ba7	248	return crypto_register_shash(&alg);
1da177e4 LT	249	}
1da177e4 LT	250
3af5b90b	251	static void __exit md5_mod_fini(void)
1da177e4	252	{
14b75ba7	253	crypto_unregister_shash(&alg);
1da177e4 LT	254	}
1da177e4 LT	255
3af5b90b KB	256	module_init(md5_mod_init);
3af5b90b KB	257	module_exit(md5_mod_fini);
1da177e4 LT	258
	259	MODULE_LICENSE("GPL");
	260	MODULE_DESCRIPTION("MD5 Message Digest Algorithm");