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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242/* * Cryptographic API. * * MD4 Message Digest Algorithm (RFC1320). * * Implementation derived from Andrew Tridgell and Steve French's * CIFS MD4 implementation, and the cryptoapi implementation * originally based on the public domain implementation written * by Colin Plumb in 1993. * * Copyright (c) Andrew Tridgell 1997-1998. * Modified by Steve French (sfrench@us.ibm.com) 2002 * Copyright (c) Cryptoapi developers. * Copyright (c) 2002 David S. Miller (davem@redhat.com) * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * */#include <crypto/internal/hash.h>#include <linux/init.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/string.h>#include <linux/types.h>#include <asm/byteorder.h>
#define MD4_DIGEST_SIZE 16#define MD4_HMAC_BLOCK_SIZE 64#define MD4_BLOCK_WORDS 16#define MD4_HASH_WORDS 4
struct md4_ctx { u32 hash[MD4_HASH_WORDS]; u32 block[MD4_BLOCK_WORDS]; u64 byte_count;};
static inline u32 lshift(u32 x, unsigned int s){ x &= 0xFFFFFFFF; return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));}
static inline u32 F(u32 x, u32 y, u32 z){ return (x & y) | ((~x) & z);}
static inline u32 G(u32 x, u32 y, u32 z){ return (x & y) | (x & z) | (y & z);}
static inline u32 H(u32 x, u32 y, u32 z){ return x ^ y ^ z;}
#define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s))#define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (u32)0x5A827999,s))#define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (u32)0x6ED9EBA1,s))
static void md4_transform(u32 *hash, u32 const *in){ u32 a, b, c, d;
a = hash[0]; b = hash[1]; c = hash[2]; d = hash[3];
ROUND1(a, b, c, d, in[0], 3); ROUND1(d, a, b, c, in[1], 7); ROUND1(c, d, a, b, in[2], 11); ROUND1(b, c, d, a, in[3], 19); ROUND1(a, b, c, d, in[4], 3); ROUND1(d, a, b, c, in[5], 7); ROUND1(c, d, a, b, in[6], 11); ROUND1(b, c, d, a, in[7], 19); ROUND1(a, b, c, d, in[8], 3); ROUND1(d, a, b, c, in[9], 7); ROUND1(c, d, a, b, in[10], 11); ROUND1(b, c, d, a, in[11], 19); ROUND1(a, b, c, d, in[12], 3); ROUND1(d, a, b, c, in[13], 7); ROUND1(c, d, a, b, in[14], 11); ROUND1(b, c, d, a, in[15], 19);
ROUND2(a, b, c, d,in[ 0], 3); ROUND2(d, a, b, c, in[4], 5); ROUND2(c, d, a, b, in[8], 9); ROUND2(b, c, d, a, in[12], 13); ROUND2(a, b, c, d, in[1], 3); ROUND2(d, a, b, c, in[5], 5); ROUND2(c, d, a, b, in[9], 9); ROUND2(b, c, d, a, in[13], 13); ROUND2(a, b, c, d, in[2], 3); ROUND2(d, a, b, c, in[6], 5); ROUND2(c, d, a, b, in[10], 9); ROUND2(b, c, d, a, in[14], 13); ROUND2(a, b, c, d, in[3], 3); ROUND2(d, a, b, c, in[7], 5); ROUND2(c, d, a, b, in[11], 9); ROUND2(b, c, d, a, in[15], 13);
ROUND3(a, b, c, d,in[ 0], 3); ROUND3(d, a, b, c, in[8], 9); ROUND3(c, d, a, b, in[4], 11); ROUND3(b, c, d, a, in[12], 15); ROUND3(a, b, c, d, in[2], 3); ROUND3(d, a, b, c, in[10], 9); ROUND3(c, d, a, b, in[6], 11); ROUND3(b, c, d, a, in[14], 15); ROUND3(a, b, c, d, in[1], 3); ROUND3(d, a, b, c, in[9], 9); ROUND3(c, d, a, b, in[5], 11); ROUND3(b, c, d, a, in[13], 15); ROUND3(a, b, c, d, in[3], 3); ROUND3(d, a, b, c, in[11], 9); ROUND3(c, d, a, b, in[7], 11); ROUND3(b, c, d, a, in[15], 15);
hash[0] += a; hash[1] += b; hash[2] += c; hash[3] += d;}
static inline void md4_transform_helper(struct md4_ctx *ctx){ le32_to_cpu_array(ctx->block, ARRAY_SIZE(ctx->block)); md4_transform(ctx->hash, ctx->block);}
static int md4_init(struct shash_desc *desc){ struct md4_ctx *mctx = shash_desc_ctx(desc);
mctx->hash[0] = 0x67452301; mctx->hash[1] = 0xefcdab89; mctx->hash[2] = 0x98badcfe; mctx->hash[3] = 0x10325476; mctx->byte_count = 0;
return 0;}
static int md4_update(struct shash_desc *desc, const u8 *data, unsigned int len){ struct md4_ctx *mctx = shash_desc_ctx(desc); const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
mctx->byte_count += len;
if (avail > len) { memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), data, len); return 0; }
memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), data, avail);
md4_transform_helper(mctx); data += avail; len -= avail;
while (len >= sizeof(mctx->block)) { memcpy(mctx->block, data, sizeof(mctx->block)); md4_transform_helper(mctx); data += sizeof(mctx->block); len -= sizeof(mctx->block); }
memcpy(mctx->block, data, len);
return 0;}
static int md4_final(struct shash_desc *desc, u8 *out){ struct md4_ctx *mctx = shash_desc_ctx(desc); const unsigned int offset = mctx->byte_count & 0x3f; char *p = (char *)mctx->block + offset; int padding = 56 - (offset + 1);
*p++ = 0x80; if (padding < 0) { memset(p, 0x00, padding + sizeof (u64)); md4_transform_helper(mctx); p = (char *)mctx->block; padding = 56; }
memset(p, 0, padding); mctx->block[14] = mctx->byte_count << 3; mctx->block[15] = mctx->byte_count >> 29; le32_to_cpu_array(mctx->block, (sizeof(mctx->block) - sizeof(u64)) / sizeof(u32)); md4_transform(mctx->hash, mctx->block); cpu_to_le32_array(mctx->hash, ARRAY_SIZE(mctx->hash)); memcpy(out, mctx->hash, sizeof(mctx->hash)); memset(mctx, 0, sizeof(*mctx));
return 0;}
static struct shash_alg alg = { .digestsize = MD4_DIGEST_SIZE, .init = md4_init, .update = md4_update, .final = md4_final, .descsize = sizeof(struct md4_ctx), .base = { .cra_name = "md4", .cra_driver_name = "md4-generic", .cra_blocksize = MD4_HMAC_BLOCK_SIZE, .cra_module = THIS_MODULE, }};
static int __init md4_mod_init(void){ return crypto_register_shash(&alg);}
static void __exit md4_mod_fini(void){ crypto_unregister_shash(&alg);}
module_init(md4_mod_init);module_exit(md4_mod_fini);
MODULE_LICENSE("GPL");MODULE_DESCRIPTION("MD4 Message Digest Algorithm");MODULE_ALIAS_CRYPTO("md4");