11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Cryptographic API. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * MD4 Message Digest Algorithm (RFC1320). 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Implementation derived from Andrew Tridgell and Steve French's 71da177e4SLinus Torvalds * CIFS MD4 implementation, and the cryptoapi implementation 81da177e4SLinus Torvalds * originally based on the public domain implementation written 91da177e4SLinus Torvalds * by Colin Plumb in 1993. 101da177e4SLinus Torvalds * 111da177e4SLinus Torvalds * Copyright (c) Andrew Tridgell 1997-1998. 121da177e4SLinus Torvalds * Modified by Steve French (sfrench@us.ibm.com) 2002 131da177e4SLinus Torvalds * Copyright (c) Cryptoapi developers. 141da177e4SLinus Torvalds * Copyright (c) 2002 David S. Miller (davem@redhat.com) 151da177e4SLinus Torvalds * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> 161da177e4SLinus Torvalds * 171da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 181da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 191da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or 201da177e4SLinus Torvalds * (at your option) any later version. 211da177e4SLinus Torvalds * 221da177e4SLinus Torvalds */ 23808a1763SAdrian-Ken Rueegsegger #include <crypto/internal/hash.h> 241da177e4SLinus Torvalds #include <linux/init.h> 251da177e4SLinus Torvalds #include <linux/kernel.h> 261da177e4SLinus Torvalds #include <linux/string.h> 2706ace7a9SHerbert Xu #include <linux/types.h> 281da177e4SLinus Torvalds #include <asm/byteorder.h> 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds #define MD4_DIGEST_SIZE 16 311da177e4SLinus Torvalds #define MD4_HMAC_BLOCK_SIZE 64 321da177e4SLinus Torvalds #define MD4_BLOCK_WORDS 16 331da177e4SLinus Torvalds #define MD4_HASH_WORDS 4 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds struct md4_ctx { 361da177e4SLinus Torvalds u32 hash[MD4_HASH_WORDS]; 371da177e4SLinus Torvalds u32 block[MD4_BLOCK_WORDS]; 381da177e4SLinus Torvalds u64 byte_count; 391da177e4SLinus Torvalds }; 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds static inline u32 lshift(u32 x, unsigned int s) 421da177e4SLinus Torvalds { 431da177e4SLinus Torvalds x &= 0xFFFFFFFF; 441da177e4SLinus Torvalds return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s)); 451da177e4SLinus Torvalds } 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds static inline u32 F(u32 x, u32 y, u32 z) 481da177e4SLinus Torvalds { 491da177e4SLinus Torvalds return (x & y) | ((~x) & z); 501da177e4SLinus Torvalds } 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds static inline u32 G(u32 x, u32 y, u32 z) 531da177e4SLinus Torvalds { 541da177e4SLinus Torvalds return (x & y) | (x & z) | (y & z); 551da177e4SLinus Torvalds } 561da177e4SLinus Torvalds 571da177e4SLinus Torvalds static inline u32 H(u32 x, u32 y, u32 z) 581da177e4SLinus Torvalds { 591da177e4SLinus Torvalds return x ^ y ^ z; 601da177e4SLinus Torvalds } 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds #define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s)) 631da177e4SLinus Torvalds #define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (u32)0x5A827999,s)) 641da177e4SLinus Torvalds #define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (u32)0x6ED9EBA1,s)) 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds /* XXX: this stuff can be optimized */ 671da177e4SLinus Torvalds static inline void le32_to_cpu_array(u32 *buf, unsigned int words) 681da177e4SLinus Torvalds { 691da177e4SLinus Torvalds while (words--) { 701da177e4SLinus Torvalds __le32_to_cpus(buf); 711da177e4SLinus Torvalds buf++; 721da177e4SLinus Torvalds } 731da177e4SLinus Torvalds } 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds static inline void cpu_to_le32_array(u32 *buf, unsigned int words) 761da177e4SLinus Torvalds { 771da177e4SLinus Torvalds while (words--) { 781da177e4SLinus Torvalds __cpu_to_le32s(buf); 791da177e4SLinus Torvalds buf++; 801da177e4SLinus Torvalds } 811da177e4SLinus Torvalds } 821da177e4SLinus Torvalds 831da177e4SLinus Torvalds static void md4_transform(u32 *hash, u32 const *in) 841da177e4SLinus Torvalds { 851da177e4SLinus Torvalds u32 a, b, c, d; 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds a = hash[0]; 881da177e4SLinus Torvalds b = hash[1]; 891da177e4SLinus Torvalds c = hash[2]; 901da177e4SLinus Torvalds d = hash[3]; 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds ROUND1(a, b, c, d, in[0], 3); 931da177e4SLinus Torvalds ROUND1(d, a, b, c, in[1], 7); 941da177e4SLinus Torvalds ROUND1(c, d, a, b, in[2], 11); 951da177e4SLinus Torvalds ROUND1(b, c, d, a, in[3], 19); 961da177e4SLinus Torvalds ROUND1(a, b, c, d, in[4], 3); 971da177e4SLinus Torvalds ROUND1(d, a, b, c, in[5], 7); 981da177e4SLinus Torvalds ROUND1(c, d, a, b, in[6], 11); 991da177e4SLinus Torvalds ROUND1(b, c, d, a, in[7], 19); 1001da177e4SLinus Torvalds ROUND1(a, b, c, d, in[8], 3); 1011da177e4SLinus Torvalds ROUND1(d, a, b, c, in[9], 7); 1021da177e4SLinus Torvalds ROUND1(c, d, a, b, in[10], 11); 1031da177e4SLinus Torvalds ROUND1(b, c, d, a, in[11], 19); 1041da177e4SLinus Torvalds ROUND1(a, b, c, d, in[12], 3); 1051da177e4SLinus Torvalds ROUND1(d, a, b, c, in[13], 7); 1061da177e4SLinus Torvalds ROUND1(c, d, a, b, in[14], 11); 1071da177e4SLinus Torvalds ROUND1(b, c, d, a, in[15], 19); 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds ROUND2(a, b, c, d,in[ 0], 3); 1101da177e4SLinus Torvalds ROUND2(d, a, b, c, in[4], 5); 1111da177e4SLinus Torvalds ROUND2(c, d, a, b, in[8], 9); 1121da177e4SLinus Torvalds ROUND2(b, c, d, a, in[12], 13); 1131da177e4SLinus Torvalds ROUND2(a, b, c, d, in[1], 3); 1141da177e4SLinus Torvalds ROUND2(d, a, b, c, in[5], 5); 1151da177e4SLinus Torvalds ROUND2(c, d, a, b, in[9], 9); 1161da177e4SLinus Torvalds ROUND2(b, c, d, a, in[13], 13); 1171da177e4SLinus Torvalds ROUND2(a, b, c, d, in[2], 3); 1181da177e4SLinus Torvalds ROUND2(d, a, b, c, in[6], 5); 1191da177e4SLinus Torvalds ROUND2(c, d, a, b, in[10], 9); 1201da177e4SLinus Torvalds ROUND2(b, c, d, a, in[14], 13); 1211da177e4SLinus Torvalds ROUND2(a, b, c, d, in[3], 3); 1221da177e4SLinus Torvalds ROUND2(d, a, b, c, in[7], 5); 1231da177e4SLinus Torvalds ROUND2(c, d, a, b, in[11], 9); 1241da177e4SLinus Torvalds ROUND2(b, c, d, a, in[15], 13); 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds ROUND3(a, b, c, d,in[ 0], 3); 1271da177e4SLinus Torvalds ROUND3(d, a, b, c, in[8], 9); 1281da177e4SLinus Torvalds ROUND3(c, d, a, b, in[4], 11); 1291da177e4SLinus Torvalds ROUND3(b, c, d, a, in[12], 15); 1301da177e4SLinus Torvalds ROUND3(a, b, c, d, in[2], 3); 1311da177e4SLinus Torvalds ROUND3(d, a, b, c, in[10], 9); 1321da177e4SLinus Torvalds ROUND3(c, d, a, b, in[6], 11); 1331da177e4SLinus Torvalds ROUND3(b, c, d, a, in[14], 15); 1341da177e4SLinus Torvalds ROUND3(a, b, c, d, in[1], 3); 1351da177e4SLinus Torvalds ROUND3(d, a, b, c, in[9], 9); 1361da177e4SLinus Torvalds ROUND3(c, d, a, b, in[5], 11); 1371da177e4SLinus Torvalds ROUND3(b, c, d, a, in[13], 15); 1381da177e4SLinus Torvalds ROUND3(a, b, c, d, in[3], 3); 1391da177e4SLinus Torvalds ROUND3(d, a, b, c, in[11], 9); 1401da177e4SLinus Torvalds ROUND3(c, d, a, b, in[7], 11); 1411da177e4SLinus Torvalds ROUND3(b, c, d, a, in[15], 15); 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds hash[0] += a; 1441da177e4SLinus Torvalds hash[1] += b; 1451da177e4SLinus Torvalds hash[2] += c; 1461da177e4SLinus Torvalds hash[3] += d; 1471da177e4SLinus Torvalds } 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds static inline void md4_transform_helper(struct md4_ctx *ctx) 1501da177e4SLinus Torvalds { 15131a61bfcSJulia Lawall le32_to_cpu_array(ctx->block, ARRAY_SIZE(ctx->block)); 1521da177e4SLinus Torvalds md4_transform(ctx->hash, ctx->block); 1531da177e4SLinus Torvalds } 1541da177e4SLinus Torvalds 155808a1763SAdrian-Ken Rueegsegger static int md4_init(struct shash_desc *desc) 1561da177e4SLinus Torvalds { 157808a1763SAdrian-Ken Rueegsegger struct md4_ctx *mctx = shash_desc_ctx(desc); 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds mctx->hash[0] = 0x67452301; 1601da177e4SLinus Torvalds mctx->hash[1] = 0xefcdab89; 1611da177e4SLinus Torvalds mctx->hash[2] = 0x98badcfe; 1621da177e4SLinus Torvalds mctx->hash[3] = 0x10325476; 1631da177e4SLinus Torvalds mctx->byte_count = 0; 164808a1763SAdrian-Ken Rueegsegger 165808a1763SAdrian-Ken Rueegsegger return 0; 1661da177e4SLinus Torvalds } 1671da177e4SLinus Torvalds 168808a1763SAdrian-Ken Rueegsegger static int md4_update(struct shash_desc *desc, const u8 *data, unsigned int len) 1691da177e4SLinus Torvalds { 170808a1763SAdrian-Ken Rueegsegger struct md4_ctx *mctx = shash_desc_ctx(desc); 1711da177e4SLinus Torvalds const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f); 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds mctx->byte_count += len; 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds if (avail > len) { 1761da177e4SLinus Torvalds memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), 1771da177e4SLinus Torvalds data, len); 178808a1763SAdrian-Ken Rueegsegger return 0; 1791da177e4SLinus Torvalds } 1801da177e4SLinus Torvalds 1811da177e4SLinus Torvalds memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), 1821da177e4SLinus Torvalds data, avail); 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds md4_transform_helper(mctx); 1851da177e4SLinus Torvalds data += avail; 1861da177e4SLinus Torvalds len -= avail; 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds while (len >= sizeof(mctx->block)) { 1891da177e4SLinus Torvalds memcpy(mctx->block, data, sizeof(mctx->block)); 1901da177e4SLinus Torvalds md4_transform_helper(mctx); 1911da177e4SLinus Torvalds data += sizeof(mctx->block); 1921da177e4SLinus Torvalds len -= sizeof(mctx->block); 1931da177e4SLinus Torvalds } 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds memcpy(mctx->block, data, len); 196808a1763SAdrian-Ken Rueegsegger 197808a1763SAdrian-Ken Rueegsegger return 0; 1981da177e4SLinus Torvalds } 1991da177e4SLinus Torvalds 200808a1763SAdrian-Ken Rueegsegger static int md4_final(struct shash_desc *desc, u8 *out) 2011da177e4SLinus Torvalds { 202808a1763SAdrian-Ken Rueegsegger struct md4_ctx *mctx = shash_desc_ctx(desc); 2031da177e4SLinus Torvalds const unsigned int offset = mctx->byte_count & 0x3f; 2041da177e4SLinus Torvalds char *p = (char *)mctx->block + offset; 2051da177e4SLinus Torvalds int padding = 56 - (offset + 1); 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds *p++ = 0x80; 2081da177e4SLinus Torvalds if (padding < 0) { 2091da177e4SLinus Torvalds memset(p, 0x00, padding + sizeof (u64)); 2101da177e4SLinus Torvalds md4_transform_helper(mctx); 2111da177e4SLinus Torvalds p = (char *)mctx->block; 2121da177e4SLinus Torvalds padding = 56; 2131da177e4SLinus Torvalds } 2141da177e4SLinus Torvalds 2151da177e4SLinus Torvalds memset(p, 0, padding); 2161da177e4SLinus Torvalds mctx->block[14] = mctx->byte_count << 3; 2171da177e4SLinus Torvalds mctx->block[15] = mctx->byte_count >> 29; 2181da177e4SLinus Torvalds le32_to_cpu_array(mctx->block, (sizeof(mctx->block) - 2191da177e4SLinus Torvalds sizeof(u64)) / sizeof(u32)); 2201da177e4SLinus Torvalds md4_transform(mctx->hash, mctx->block); 22131a61bfcSJulia Lawall cpu_to_le32_array(mctx->hash, ARRAY_SIZE(mctx->hash)); 2221da177e4SLinus Torvalds memcpy(out, mctx->hash, sizeof(mctx->hash)); 2231da177e4SLinus Torvalds memset(mctx, 0, sizeof(*mctx)); 224808a1763SAdrian-Ken Rueegsegger 225808a1763SAdrian-Ken Rueegsegger return 0; 2261da177e4SLinus Torvalds } 2271da177e4SLinus Torvalds 228808a1763SAdrian-Ken Rueegsegger static struct shash_alg alg = { 229808a1763SAdrian-Ken Rueegsegger .digestsize = MD4_DIGEST_SIZE, 230808a1763SAdrian-Ken Rueegsegger .init = md4_init, 231808a1763SAdrian-Ken Rueegsegger .update = md4_update, 232808a1763SAdrian-Ken Rueegsegger .final = md4_final, 233808a1763SAdrian-Ken Rueegsegger .descsize = sizeof(struct md4_ctx), 234808a1763SAdrian-Ken Rueegsegger .base = { 2351da177e4SLinus Torvalds .cra_name = "md4", 236808a1763SAdrian-Ken Rueegsegger .cra_flags = CRYPTO_ALG_TYPE_SHASH, 2371da177e4SLinus Torvalds .cra_blocksize = MD4_HMAC_BLOCK_SIZE, 2381da177e4SLinus Torvalds .cra_module = THIS_MODULE, 239808a1763SAdrian-Ken Rueegsegger } 2401da177e4SLinus Torvalds }; 2411da177e4SLinus Torvalds 2423af5b90bSKamalesh Babulal static int __init md4_mod_init(void) 2431da177e4SLinus Torvalds { 244808a1763SAdrian-Ken Rueegsegger return crypto_register_shash(&alg); 2451da177e4SLinus Torvalds } 2461da177e4SLinus Torvalds 2473af5b90bSKamalesh Babulal static void __exit md4_mod_fini(void) 2481da177e4SLinus Torvalds { 249808a1763SAdrian-Ken Rueegsegger crypto_unregister_shash(&alg); 2501da177e4SLinus Torvalds } 2511da177e4SLinus Torvalds 2523af5b90bSKamalesh Babulal module_init(md4_mod_init); 2533af5b90bSKamalesh Babulal module_exit(md4_mod_fini); 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 2561da177e4SLinus Torvalds MODULE_DESCRIPTION("MD4 Message Digest Algorithm"); 2571da177e4SLinus Torvalds 258