xref: /openbmc/linux/crypto/md4.c (revision a48c7709)
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 (sfrench@us.ibm.com) 2002
13   * Copyright (c) Cryptoapi developers.
14   * Copyright (c) 2002 David S. Miller (davem@redhat.com)
15   * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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   */
23  #include <crypto/internal/hash.h>
24  #include <linux/init.h>
25  #include <linux/kernel.h>
26  #include <linux/module.h>
27  #include <linux/string.h>
28  #include <linux/types.h>
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  }
62  
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  
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  {
135  	le32_to_cpu_array(ctx->block, ARRAY_SIZE(ctx->block));
136  	md4_transform(ctx->hash, ctx->block);
137  }
138  
139  static int md4_init(struct shash_desc *desc)
140  {
141  	struct md4_ctx *mctx = shash_desc_ctx(desc);
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;
148  
149  	return 0;
150  }
151  
152  static int md4_update(struct shash_desc *desc, const u8 *data, unsigned int len)
153  {
154  	struct md4_ctx *mctx = shash_desc_ctx(desc);
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);
162  		return 0;
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);
180  
181  	return 0;
182  }
183  
184  static int md4_final(struct shash_desc *desc, u8 *out)
185  {
186  	struct md4_ctx *mctx = shash_desc_ctx(desc);
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);
205  	cpu_to_le32_array(mctx->hash, ARRAY_SIZE(mctx->hash));
206  	memcpy(out, mctx->hash, sizeof(mctx->hash));
207  	memset(mctx, 0, sizeof(*mctx));
208  
209  	return 0;
210  }
211  
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		=	{
219  		.cra_name	=	"md4",
220  		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
221  		.cra_blocksize	=	MD4_HMAC_BLOCK_SIZE,
222  		.cra_module	=	THIS_MODULE,
223  	}
224  };
225  
226  static int __init md4_mod_init(void)
227  {
228  	return crypto_register_shash(&alg);
229  }
230  
231  static void __exit md4_mod_fini(void)
232  {
233  	crypto_unregister_shash(&alg);
234  }
235  
236  module_init(md4_mod_init);
237  module_exit(md4_mod_fini);
238  
239  MODULE_LICENSE("GPL");
240  MODULE_DESCRIPTION("MD4 Message Digest Algorithm");
241  MODULE_ALIAS_CRYPTO("md4");
242