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FreeBSD/Linux Kernel Cross Reference
sys/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");

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