forked from Minki/linux
31a61bfc6e
ARRAY_SIZE is more concise to use when the size of an array is divided by the size of its type or the size of its first element. The semantic patch that makes this change is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @i@ @@ #include <linux/kernel.h> @depends on i using "paren.iso"@ type T; T[] E; @@ - (sizeof(E)/sizeof(T)) + ARRAY_SIZE(E) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
252 lines
6.2 KiB
C
252 lines
6.2 KiB
C
/*
|
|
* 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 <linux/init.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/kernel.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))
|
|
|
|
/* XXX: this stuff can be optimized */
|
|
static inline void le32_to_cpu_array(u32 *buf, unsigned int words)
|
|
{
|
|
while (words--) {
|
|
__le32_to_cpus(buf);
|
|
buf++;
|
|
}
|
|
}
|
|
|
|
static inline void cpu_to_le32_array(u32 *buf, unsigned int words)
|
|
{
|
|
while (words--) {
|
|
__cpu_to_le32s(buf);
|
|
buf++;
|
|
}
|
|
}
|
|
|
|
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 void md4_init(struct crypto_tfm *tfm)
|
|
{
|
|
struct md4_ctx *mctx = crypto_tfm_ctx(tfm);
|
|
|
|
mctx->hash[0] = 0x67452301;
|
|
mctx->hash[1] = 0xefcdab89;
|
|
mctx->hash[2] = 0x98badcfe;
|
|
mctx->hash[3] = 0x10325476;
|
|
mctx->byte_count = 0;
|
|
}
|
|
|
|
static void md4_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
|
|
{
|
|
struct md4_ctx *mctx = crypto_tfm_ctx(tfm);
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static void md4_final(struct crypto_tfm *tfm, u8 *out)
|
|
{
|
|
struct md4_ctx *mctx = crypto_tfm_ctx(tfm);
|
|
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));
|
|
}
|
|
|
|
static struct crypto_alg alg = {
|
|
.cra_name = "md4",
|
|
.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
|
|
.cra_blocksize = MD4_HMAC_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct md4_ctx),
|
|
.cra_module = THIS_MODULE,
|
|
.cra_list = LIST_HEAD_INIT(alg.cra_list),
|
|
.cra_u = { .digest = {
|
|
.dia_digestsize = MD4_DIGEST_SIZE,
|
|
.dia_init = md4_init,
|
|
.dia_update = md4_update,
|
|
.dia_final = md4_final } }
|
|
};
|
|
|
|
static int __init md4_mod_init(void)
|
|
{
|
|
return crypto_register_alg(&alg);
|
|
}
|
|
|
|
static void __exit md4_mod_fini(void)
|
|
{
|
|
crypto_unregister_alg(&alg);
|
|
}
|
|
|
|
module_init(md4_mod_init);
|
|
module_exit(md4_mod_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("MD4 Message Digest Algorithm");
|
|
|