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TOMOYO Linux Cross Reference
Linux/crypto/md5.c

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  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 <jmorris@intercode.com.au>
 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  */
 18 #include <linux/init.h>
 19 #include <linux/module.h>
 20 #include <linux/string.h>
 21 #include <linux/crypto.h>
 22 #include <asm/byteorder.h>
 23 
 24 #define MD5_DIGEST_SIZE         16
 25 #define MD5_HMAC_BLOCK_SIZE     64
 26 #define MD5_BLOCK_WORDS         16
 27 #define MD5_HASH_WORDS          4
 28 
 29 #define F1(x, y, z)     (z ^ (x & (y ^ z)))
 30 #define F2(x, y, z)     F1(z, x, y)
 31 #define F3(x, y, z)     (x ^ y ^ z)
 32 #define F4(x, y, z)     (y ^ (x | ~z))
 33 
 34 #define MD5STEP(f, w, x, y, z, in, s) \
 35         (w += f(x, y, z) + in, w = (w<<s | w>>(32-s)) + x)
 36 
 37 struct md5_ctx {
 38         u32 hash[MD5_HASH_WORDS];
 39         u32 block[MD5_BLOCK_WORDS];
 40         u64 byte_count;
 41 };
 42 
 43 static void md5_transform(u32 *hash, u32 const *in)
 44 {
 45         u32 a, b, c, d;
 46 
 47         a = hash[0];
 48         b = hash[1];
 49         c = hash[2];
 50         d = hash[3];
 51 
 52         MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
 53         MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
 54         MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
 55         MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
 56         MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
 57         MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
 58         MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
 59         MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
 60         MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
 61         MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
 62         MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
 63         MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
 64         MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
 65         MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
 66         MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
 67         MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
 68 
 69         MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
 70         MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
 71         MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
 72         MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
 73         MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
 74         MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
 75         MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
 76         MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
 77         MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
 78         MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
 79         MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
 80         MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
 81         MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
 82         MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
 83         MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
 84         MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
 85 
 86         MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
 87         MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
 88         MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
 89         MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
 90         MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
 91         MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
 92         MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
 93         MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
 94         MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
 95         MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
 96         MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
 97         MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
 98         MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
 99         MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
100         MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
101         MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
102 
103         MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
104         MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
105         MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
106         MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
107         MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
108         MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
109         MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
110         MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
111         MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
112         MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
113         MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
114         MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
115         MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
116         MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
117         MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
118         MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
119 
120         hash[0] += a;
121         hash[1] += b;
122         hash[2] += c;
123         hash[3] += d;
124 }
125 
126 /* XXX: this stuff can be optimized */
127 static inline void le32_to_cpu_array(u32 *buf, unsigned int words)
128 {
129         while (words--) {
130                 __le32_to_cpus(buf);
131                 buf++;
132         }
133 }
134 
135 static inline void cpu_to_le32_array(u32 *buf, unsigned int words)
136 {
137         while (words--) {
138                 __cpu_to_le32s(buf);
139                 buf++;
140         }
141 }
142 
143 static inline void md5_transform_helper(struct md5_ctx *ctx)
144 {
145         le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
146         md5_transform(ctx->hash, ctx->block);
147 }
148 
149 static void md5_init(void *ctx)
150 {
151         struct md5_ctx *mctx = ctx;
152 
153         mctx->hash[0] = 0x67452301;
154         mctx->hash[1] = 0xefcdab89;
155         mctx->hash[2] = 0x98badcfe;
156         mctx->hash[3] = 0x10325476;
157         mctx->byte_count = 0;
158 }
159 
160 static void md5_update(void *ctx, const u8 *data, unsigned int len)
161 {
162         struct md5_ctx *mctx = ctx;
163         const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
164 
165         mctx->byte_count += len;
166 
167         if (avail > len) {
168                 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
169                        data, len);
170                 return;
171         }
172 
173         memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
174                data, avail);
175 
176         md5_transform_helper(mctx);
177         data += avail;
178         len -= avail;
179 
180         while (len >= sizeof(mctx->block)) {
181                 memcpy(mctx->block, data, sizeof(mctx->block));
182                 md5_transform_helper(mctx);
183                 data += sizeof(mctx->block);
184                 len -= sizeof(mctx->block);
185         }
186 
187         memcpy(mctx->block, data, len);
188 }
189 
190 static void md5_final(void *ctx, u8 *out)
191 {
192         struct md5_ctx *mctx = ctx;
193         const unsigned int offset = mctx->byte_count & 0x3f;
194         char *p = (char *)mctx->block + offset;
195         int padding = 56 - (offset + 1);
196 
197         *p++ = 0x80;
198         if (padding < 0) {
199                 memset(p, 0x00, padding + sizeof (u64));
200                 md5_transform_helper(mctx);
201                 p = (char *)mctx->block;
202                 padding = 56;
203         }
204 
205         memset(p, 0, padding);
206         mctx->block[14] = mctx->byte_count << 3;
207         mctx->block[15] = mctx->byte_count >> 29;
208         le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
209                           sizeof(u64)) / sizeof(u32));
210         md5_transform(mctx->hash, mctx->block);
211         cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32));
212         memcpy(out, mctx->hash, sizeof(mctx->hash));
213         memset(mctx, 0, sizeof(*mctx));
214 }
215 
216 static struct crypto_alg alg = {
217         .cra_name       =       "md5",
218         .cra_flags      =       CRYPTO_ALG_TYPE_DIGEST,
219         .cra_blocksize  =       MD5_HMAC_BLOCK_SIZE,
220         .cra_ctxsize    =       sizeof(struct md5_ctx),
221         .cra_module     =       THIS_MODULE,
222         .cra_list       =       LIST_HEAD_INIT(alg.cra_list),
223         .cra_u          =       { .digest = {
224         .dia_digestsize =       MD5_DIGEST_SIZE,
225         .dia_init       =       md5_init,
226         .dia_update     =       md5_update,
227         .dia_final      =       md5_final } }
228 };
229 
230 static int __init init(void)
231 {
232         return crypto_register_alg(&alg);
233 }
234 
235 static void __exit fini(void)
236 {
237         crypto_unregister_alg(&alg);
238 }
239 
240 module_init(init);
241 module_exit(fini);
242 
243 MODULE_LICENSE("GPL");
244 MODULE_DESCRIPTION("MD5 Message Digest Algorithm");
245 

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