Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 18 | #include <crypto/internal/hash.h> |
Max Vozeler | 7d6f75e | 2010-01-17 21:55:31 +1100 | [diff] [blame^] | 19 | #include <crypto/md5.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/init.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/string.h> |
Herbert Xu | 06ace7a | 2005-10-30 21:25:15 +1100 | [diff] [blame] | 23 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <asm/byteorder.h> |
| 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Max Vozeler | 7d6f75e | 2010-01-17 21:55:31 +1100 | [diff] [blame^] | 134 | static inline void md5_transform_helper(struct md5_state *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | { |
| 136 | le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32)); |
| 137 | md5_transform(ctx->hash, ctx->block); |
| 138 | } |
| 139 | |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 140 | static int md5_init(struct shash_desc *desc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | { |
Max Vozeler | 7d6f75e | 2010-01-17 21:55:31 +1100 | [diff] [blame^] | 142 | struct md5_state *mctx = shash_desc_ctx(desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 149 | |
| 150 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | } |
| 152 | |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 153 | static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | { |
Max Vozeler | 7d6f75e | 2010-01-17 21:55:31 +1100 | [diff] [blame^] | 155 | struct md5_state *mctx = shash_desc_ctx(desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 163 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 181 | |
| 182 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | } |
| 184 | |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 185 | static int md5_final(struct shash_desc *desc, u8 *out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | { |
Max Vozeler | 7d6f75e | 2010-01-17 21:55:31 +1100 | [diff] [blame^] | 187 | struct md5_state *mctx = shash_desc_ctx(desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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)); |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 209 | |
| 210 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | } |
| 212 | |
Max Vozeler | 7d6f75e | 2010-01-17 21:55:31 +1100 | [diff] [blame^] | 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 | |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 229 | static struct shash_alg alg = { |
| 230 | .digestsize = MD5_DIGEST_SIZE, |
| 231 | .init = md5_init, |
| 232 | .update = md5_update, |
| 233 | .final = md5_final, |
Max Vozeler | 7d6f75e | 2010-01-17 21:55:31 +1100 | [diff] [blame^] | 234 | .export = md5_export, |
| 235 | .import = md5_import, |
| 236 | .descsize = sizeof(struct md5_state), |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 237 | .base = { |
| 238 | .cra_name = "md5", |
| 239 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, |
| 240 | .cra_blocksize = MD5_HMAC_BLOCK_SIZE, |
| 241 | .cra_module = THIS_MODULE, |
| 242 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | }; |
| 244 | |
Kamalesh Babulal | 3af5b90 | 2008-04-05 21:00:57 +0800 | [diff] [blame] | 245 | static int __init md5_mod_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | { |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 247 | return crypto_register_shash(&alg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | } |
| 249 | |
Kamalesh Babulal | 3af5b90 | 2008-04-05 21:00:57 +0800 | [diff] [blame] | 250 | static void __exit md5_mod_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | { |
Adrian-Ken Rueegsegger | 14b75ba | 2008-12-03 19:57:12 +0800 | [diff] [blame] | 252 | crypto_unregister_shash(&alg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | } |
| 254 | |
Kamalesh Babulal | 3af5b90 | 2008-04-05 21:00:57 +0800 | [diff] [blame] | 255 | module_init(md5_mod_init); |
| 256 | module_exit(md5_mod_fini); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | |
| 258 | MODULE_LICENSE("GPL"); |
| 259 | MODULE_DESCRIPTION("MD5 Message Digest Algorithm"); |