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/string.h> 27#include <linux/types.h> 28#include <asm/byteorder.h> 29 30#define MD4_DIGEST_SIZE 16 31#define MD4_HMAC_BLOCK_SIZE 64 32#define MD4_BLOCK_WORDS 16 33#define MD4_HASH_WORDS 4 34 35struct md4_ctx { 36 u32 hash[MD4_HASH_WORDS]; 37 u32 block[MD4_BLOCK_WORDS]; 38 u64 byte_count; 39}; 40 41static inline u32 lshift(u32 x, unsigned int s) 42{ 43 x &= 0xFFFFFFFF; 44 return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s)); 45} 46 47static inline u32 F(u32 x, u32 y, u32 z) 48{ 49 return (x & y) | ((~x) & z); 50} 51 52static inline u32 G(u32 x, u32 y, u32 z) 53{ 54 return (x & y) | (x & z) | (y & z); 55} 56 57static inline u32 H(u32 x, u32 y, u32 z) 58{ 59 return x ^ y ^ z; 60} 61 62#define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s)) 63#define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (u32)0x5A827999,s)) 64#define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (u32)0x6ED9EBA1,s)) 65 66static inline void le32_to_cpu_array(u32 *buf, unsigned int words) 67{ 68 while (words--) { 69 __le32_to_cpus(buf); 70 buf++; 71 } 72} 73 74static inline void cpu_to_le32_array(u32 *buf, unsigned int words) 75{ 76 while (words--) { 77 __cpu_to_le32s(buf); 78 buf++; 79 } 80} 81 82static void md4_transform(u32 *hash, u32 const *in) 83{ 84 u32 a, b, c, d; 85 86 a = hash[0]; 87 b = hash[1]; 88 c = hash[2]; 89 d = hash[3]; 90 91 ROUND1(a, b, c, d, in[0], 3); 92 ROUND1(d, a, b, c, in[1], 7); 93 ROUND1(c, d, a, b, in[2], 11); 94 ROUND1(b, c, d, a, in[3], 19); 95 ROUND1(a, b, c, d, in[4], 3); 96 ROUND1(d, a, b, c, in[5], 7); 97 ROUND1(c, d, a, b, in[6], 11); 98 ROUND1(b, c, d, a, in[7], 19); 99 ROUND1(a, b, c, d, in[8], 3); 100 ROUND1(d, a, b, c, in[9], 7); 101 ROUND1(c, d, a, b, in[10], 11); 102 ROUND1(b, c, d, a, in[11], 19); 103 ROUND1(a, b, c, d, in[12], 3); 104 ROUND1(d, a, b, c, in[13], 7); 105 ROUND1(c, d, a, b, in[14], 11); 106 ROUND1(b, c, d, a, in[15], 19); 107 108 ROUND2(a, b, c, d,in[ 0], 3); 109 ROUND2(d, a, b, c, in[4], 5); 110 ROUND2(c, d, a, b, in[8], 9); 111 ROUND2(b, c, d, a, in[12], 13); 112 ROUND2(a, b, c, d, in[1], 3); 113 ROUND2(d, a, b, c, in[5], 5); 114 ROUND2(c, d, a, b, in[9], 9); 115 ROUND2(b, c, d, a, in[13], 13); 116 ROUND2(a, b, c, d, in[2], 3); 117 ROUND2(d, a, b, c, in[6], 5); 118 ROUND2(c, d, a, b, in[10], 9); 119 ROUND2(b, c, d, a, in[14], 13); 120 ROUND2(a, b, c, d, in[3], 3); 121 ROUND2(d, a, b, c, in[7], 5); 122 ROUND2(c, d, a, b, in[11], 9); 123 ROUND2(b, c, d, a, in[15], 13); 124 125 ROUND3(a, b, c, d,in[ 0], 3); 126 ROUND3(d, a, b, c, in[8], 9); 127 ROUND3(c, d, a, b, in[4], 11); 128 ROUND3(b, c, d, a, in[12], 15); 129 ROUND3(a, b, c, d, in[2], 3); 130 ROUND3(d, a, b, c, in[10], 9); 131 ROUND3(c, d, a, b, in[6], 11); 132 ROUND3(b, c, d, a, in[14], 15); 133 ROUND3(a, b, c, d, in[1], 3); 134 ROUND3(d, a, b, c, in[9], 9); 135 ROUND3(c, d, a, b, in[5], 11); 136 ROUND3(b, c, d, a, in[13], 15); 137 ROUND3(a, b, c, d, in[3], 3); 138 ROUND3(d, a, b, c, in[11], 9); 139 ROUND3(c, d, a, b, in[7], 11); 140 ROUND3(b, c, d, a, in[15], 15); 141 142 hash[0] += a; 143 hash[1] += b; 144 hash[2] += c; 145 hash[3] += d; 146} 147 148static inline void md4_transform_helper(struct md4_ctx *ctx) 149{ 150 le32_to_cpu_array(ctx->block, ARRAY_SIZE(ctx->block)); 151 md4_transform(ctx->hash, ctx->block); 152} 153 154static int md4_init(struct shash_desc *desc) 155{ 156 struct md4_ctx *mctx = shash_desc_ctx(desc); 157 158 mctx->hash[0] = 0x67452301; 159 mctx->hash[1] = 0xefcdab89; 160 mctx->hash[2] = 0x98badcfe; 161 mctx->hash[3] = 0x10325476; 162 mctx->byte_count = 0; 163 164 return 0; 165} 166 167static int md4_update(struct shash_desc *desc, const u8 *data, unsigned int len) 168{ 169 struct md4_ctx *mctx = shash_desc_ctx(desc); 170 const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f); 171 172 mctx->byte_count += len; 173 174 if (avail > len) { 175 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), 176 data, len); 177 return 0; 178 } 179 180 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), 181 data, avail); 182 183 md4_transform_helper(mctx); 184 data += avail; 185 len -= avail; 186 187 while (len >= sizeof(mctx->block)) { 188 memcpy(mctx->block, data, sizeof(mctx->block)); 189 md4_transform_helper(mctx); 190 data += sizeof(mctx->block); 191 len -= sizeof(mctx->block); 192 } 193 194 memcpy(mctx->block, data, len); 195 196 return 0; 197} 198 199static int md4_final(struct shash_desc *desc, u8 *out) 200{ 201 struct md4_ctx *mctx = shash_desc_ctx(desc); 202 const unsigned int offset = mctx->byte_count & 0x3f; 203 char *p = (char *)mctx->block + offset; 204 int padding = 56 - (offset + 1); 205 206 *p++ = 0x80; 207 if (padding < 0) { 208 memset(p, 0x00, padding + sizeof (u64)); 209 md4_transform_helper(mctx); 210 p = (char *)mctx->block; 211 padding = 56; 212 } 213 214 memset(p, 0, padding); 215 mctx->block[14] = mctx->byte_count << 3; 216 mctx->block[15] = mctx->byte_count >> 29; 217 le32_to_cpu_array(mctx->block, (sizeof(mctx->block) - 218 sizeof(u64)) / sizeof(u32)); 219 md4_transform(mctx->hash, mctx->block); 220 cpu_to_le32_array(mctx->hash, ARRAY_SIZE(mctx->hash)); 221 memcpy(out, mctx->hash, sizeof(mctx->hash)); 222 memset(mctx, 0, sizeof(*mctx)); 223 224 return 0; 225} 226 227static struct shash_alg alg = { 228 .digestsize = MD4_DIGEST_SIZE, 229 .init = md4_init, 230 .update = md4_update, 231 .final = md4_final, 232 .descsize = sizeof(struct md4_ctx), 233 .base = { 234 .cra_name = "md4", 235 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 236 .cra_blocksize = MD4_HMAC_BLOCK_SIZE, 237 .cra_module = THIS_MODULE, 238 } 239}; 240 241static int __init md4_mod_init(void) 242{ 243 return crypto_register_shash(&alg); 244} 245 246static void __exit md4_mod_fini(void) 247{ 248 crypto_unregister_shash(&alg); 249} 250 251module_init(md4_mod_init); 252module_exit(md4_mod_fini); 253 254MODULE_LICENSE("GPL"); 255MODULE_DESCRIPTION("MD4 Message Digest Algorithm"); 256