251 lines · c
1/* 2 * Cryptographic API.3 *4 * MD5 Message Digest Algorithm (RFC1321).5 *6 * Derived from cryptoapi implementation, originally based on the7 * 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 it13 * under the terms of the GNU General Public License as published by the Free14 * Software Foundation; either version 2 of the License, or (at your option) 15 * any later version.16 *17 */18#include <crypto/internal/hash.h>19#include <crypto/md5.h>20#include <linux/init.h>21#include <linux/module.h>22#include <linux/string.h>23#include <linux/types.h>24#include <asm/byteorder.h>25 26const u8 md5_zero_message_hash[MD5_DIGEST_SIZE] = {27 0xd4, 0x1d, 0x8c, 0xd9, 0x8f, 0x00, 0xb2, 0x04,28 0xe9, 0x80, 0x09, 0x98, 0xec, 0xf8, 0x42, 0x7e,29};30EXPORT_SYMBOL_GPL(md5_zero_message_hash);31 32#define F1(x, y, z) (z ^ (x & (y ^ z)))33#define F2(x, y, z) F1(z, x, y)34#define F3(x, y, z) (x ^ y ^ z)35#define F4(x, y, z) (y ^ (x | ~z))36 37#define MD5STEP(f, w, x, y, z, in, s) \38 (w += f(x, y, z) + in, w = (w<<s | w>>(32-s)) + x)39 40static void md5_transform(__u32 *hash, __u32 const *in)41{42 u32 a, b, c, d;43 44 a = hash[0];45 b = hash[1];46 c = hash[2];47 d = hash[3];48 49 MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);50 MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);51 MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);52 MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);53 MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);54 MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);55 MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);56 MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);57 MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);58 MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);59 MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);60 MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);61 MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);62 MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);63 MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);64 MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);65 66 MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);67 MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);68 MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);69 MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);70 MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);71 MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);72 MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);73 MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);74 MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);75 MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);76 MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);77 MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);78 MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);79 MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);80 MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);81 MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);82 83 MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);84 MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);85 MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);86 MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);87 MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);88 MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);89 MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);90 MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);91 MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);92 MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);93 MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);94 MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);95 MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);96 MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);97 MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);98 MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);99 100 MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);101 MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);102 MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);103 MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);104 MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);105 MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);106 MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);107 MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);108 MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);109 MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);110 MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);111 MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);112 MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);113 MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);114 MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);115 MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);116 117 hash[0] += a;118 hash[1] += b;119 hash[2] += c;120 hash[3] += d;121}122 123static inline void md5_transform_helper(struct md5_state *ctx)124{125 le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));126 md5_transform(ctx->hash, ctx->block);127}128 129static int md5_init(struct shash_desc *desc)130{131 struct md5_state *mctx = shash_desc_ctx(desc);132 133 mctx->hash[0] = MD5_H0;134 mctx->hash[1] = MD5_H1;135 mctx->hash[2] = MD5_H2;136 mctx->hash[3] = MD5_H3;137 mctx->byte_count = 0;138 139 return 0;140}141 142static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len)143{144 struct md5_state *mctx = shash_desc_ctx(desc);145 const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);146 147 mctx->byte_count += len;148 149 if (avail > len) {150 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),151 data, len);152 return 0;153 }154 155 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),156 data, avail);157 158 md5_transform_helper(mctx);159 data += avail;160 len -= avail;161 162 while (len >= sizeof(mctx->block)) {163 memcpy(mctx->block, data, sizeof(mctx->block));164 md5_transform_helper(mctx);165 data += sizeof(mctx->block);166 len -= sizeof(mctx->block);167 }168 169 memcpy(mctx->block, data, len);170 171 return 0;172}173 174static int md5_final(struct shash_desc *desc, u8 *out)175{176 struct md5_state *mctx = shash_desc_ctx(desc);177 const unsigned int offset = mctx->byte_count & 0x3f;178 char *p = (char *)mctx->block + offset;179 int padding = 56 - (offset + 1);180 181 *p++ = 0x80;182 if (padding < 0) {183 memset(p, 0x00, padding + sizeof (u64));184 md5_transform_helper(mctx);185 p = (char *)mctx->block;186 padding = 56;187 }188 189 memset(p, 0, padding);190 mctx->block[14] = mctx->byte_count << 3;191 mctx->block[15] = mctx->byte_count >> 29;192 le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -193 sizeof(u64)) / sizeof(u32));194 md5_transform(mctx->hash, mctx->block);195 cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32));196 memcpy(out, mctx->hash, sizeof(mctx->hash));197 memset(mctx, 0, sizeof(*mctx));198 199 return 0;200}201 202static int md5_export(struct shash_desc *desc, void *out)203{204 struct md5_state *ctx = shash_desc_ctx(desc);205 206 memcpy(out, ctx, sizeof(*ctx));207 return 0;208}209 210static int md5_import(struct shash_desc *desc, const void *in)211{212 struct md5_state *ctx = shash_desc_ctx(desc);213 214 memcpy(ctx, in, sizeof(*ctx));215 return 0;216}217 218static struct shash_alg alg = {219 .digestsize = MD5_DIGEST_SIZE,220 .init = md5_init,221 .update = md5_update,222 .final = md5_final,223 .export = md5_export,224 .import = md5_import,225 .descsize = sizeof(struct md5_state),226 .statesize = sizeof(struct md5_state),227 .base = {228 .cra_name = "md5",229 .cra_driver_name = "md5-generic",230 .cra_blocksize = MD5_HMAC_BLOCK_SIZE,231 .cra_module = THIS_MODULE,232 }233};234 235static int __init md5_mod_init(void)236{237 return crypto_register_shash(&alg);238}239 240static void __exit md5_mod_fini(void)241{242 crypto_unregister_shash(&alg);243}244 245subsys_initcall(md5_mod_init);246module_exit(md5_mod_fini);247 248MODULE_LICENSE("GPL");249MODULE_DESCRIPTION("MD5 Message Digest Algorithm");250MODULE_ALIAS_CRYPTO("md5");251