Release 4.7 crypto/md4.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 <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));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david s. miller | david s. miller | 37 | 94.87% | 1 | 33.33% |
| james morris | james morris | 2 | 5.13% | 2 | 66.67% |
| Total | 39 | 100.00% | 3 | 100.00% |
static inline u32 F(u32 x, u32 y, u32 z)
{
return (x & y) | ((~x) & z);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david s. miller | david s. miller | 32 | 100.00% | 1 | 100.00% |
| Total | 32 | 100.00% | 1 | 100.00% |
static inline u32 G(u32 x, u32 y, u32 z)
{
return (x & y) | (x & z) | (y & z);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david s. miller | david s. miller | 35 | 100.00% | 1 | 100.00% |
| Total | 35 | 100.00% | 1 | 100.00% |
static inline u32 H(u32 x, u32 y, u32 z)
{
return x ^ y ^ z;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david s. miller | david s. miller | 23 | 100.00% | 1 | 100.00% |
| Total | 23 | 100.00% | 1 | 100.00% |
#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++;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david s. miller | david s. miller | 29 | 96.67% | 1 | 50.00% |
| james morris | james morris | 1 | 3.33% | 1 | 50.00% |
| Total | 30 | 100.00% | 2 | 100.00% |
static inline void cpu_to_le32_array(u32 *buf, unsigned int words)
{
while (words--) {
__cpu_to_le32s(buf);
buf++;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david s. miller | david s. miller | 29 | 96.67% | 1 | 50.00% |
| james morris | james morris | 1 | 3.33% | 1 | 50.00% |
| Total | 30 | 100.00% | 2 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david s. miller | david s. miller | 944 | 100.00% | 1 | 100.00% |
| Total | 944 | 100.00% | 1 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david s. miller | david s. miller | 36 | 97.30% | 1 | 50.00% |
| julia lawall | julia lawall | 1 | 2.70% | 1 | 50.00% |
| Total | 37 | 100.00% | 2 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david s. miller | david s. miller | 55 | 83.33% | 1 | 33.33% |
| adrian-ken rueegsegger | adrian-ken rueegsegger | 8 | 12.12% | 1 | 33.33% |
| herbert xu | herbert xu | 3 | 4.55% | 1 | 33.33% |
| Total | 66 | 100.00% | 3 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david s. miller | david s. miller | 181 | 91.88% | 1 | 25.00% |
| adrian-ken rueegsegger | adrian-ken rueegsegger | 11 | 5.58% | 1 | 25.00% |
| herbert xu | herbert xu | 3 | 1.52% | 1 | 25.00% |
| james morris | james morris | 2 | 1.02% | 1 | 25.00% |
| Total | 197 | 100.00% | 4 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david s. miller | david s. miller | 212 | 93.81% | 1 | 16.67% |
| adrian-ken rueegsegger | adrian-ken rueegsegger | 8 | 3.54% | 1 | 16.67% |
| herbert xu | herbert xu | 3 | 1.33% | 1 | 16.67% |
| james morris | james morris | 1 | 0.44% | 1 | 16.67% |
| andrew morton | andrew morton | 1 | 0.44% | 1 | 16.67% |
| julia lawall | julia lawall | 1 | 0.44% | 1 | 16.67% |
| Total | 226 | 100.00% | 6 | 100.00% |
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_flags = CRYPTO_ALG_TYPE_SHASH,
.cra_blocksize = MD4_HMAC_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
};
static int __init md4_mod_init(void)
{
return crypto_register_shash(&alg);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david s. miller | david s. miller | 14 | 87.50% | 1 | 33.33% |
| kamalesh babulal | kamalesh babulal | 1 | 6.25% | 1 | 33.33% |
| adrian-ken rueegsegger | adrian-ken rueegsegger | 1 | 6.25% | 1 | 33.33% |
| Total | 16 | 100.00% | 3 | 100.00% |
static void __exit md4_mod_fini(void)
{
crypto_unregister_shash(&alg);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david s. miller | david s. miller | 13 | 86.67% | 1 | 33.33% |
| adrian-ken rueegsegger | adrian-ken rueegsegger | 1 | 6.67% | 1 | 33.33% |
| kamalesh babulal | kamalesh babulal | 1 | 6.67% | 1 | 33.33% |
| Total | 15 | 100.00% | 3 | 100.00% |
module_init(md4_mod_init);
module_exit(md4_mod_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MD4 Message Digest Algorithm");
MODULE_ALIAS_CRYPTO("md4");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david s. miller | david s. miller | 1793 | 95.07% | 1 | 8.33% |
| adrian-ken rueegsegger | adrian-ken rueegsegger | 54 | 2.86% | 1 | 8.33% |
| james morris | james morris | 12 | 0.64% | 3 | 25.00% |
| herbert xu | herbert xu | 12 | 0.64% | 2 | 16.67% |
| kees cook | kees cook | 5 | 0.27% | 1 | 8.33% |
| kamalesh babulal | kamalesh babulal | 4 | 0.21% | 1 | 8.33% |
| paul gortmaker | paul gortmaker | 3 | 0.16% | 1 | 8.33% |
| julia lawall | julia lawall | 2 | 0.11% | 1 | 8.33% |
| andrew morton | andrew morton | 1 | 0.05% | 1 | 8.33% |
| Total | 1886 | 100.00% | 12 | 100.00% |
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