/*
Unix SMB/Netbios implementation.
Version 1.9.
a implementation of MD4 designed for use in the SMB authentication protocol
Copyright (C) Andrew Tridgell 1997-1998.
Modified by Steve French (sfrench@us.ibm.com) 2002-2003
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.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/fs.h>
#include "cifsencrypt.h"
/* NOTE: This code makes no attempt to be fast! */
static __u32
F(__u32 X, __u32 Y, __u32 Z)
{
return (X & Y) | ((~X) & Z);
}
static __u32
G(__u32 X, __u32 Y, __u32 Z)
{
return (X & Y) | (X & Z) | (Y & Z);
}
static __u32
H(__u32 X, __u32 Y, __u32 Z)
{
return X ^ Y ^ Z;
}
static __u32
lshift(__u32 x, int s)
{
x &= 0xFFFFFFFF;
return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));
}
#define ROUND1(a,b,c,d,k,s) (*a) = lshift((*a) + F(*b,*c,*d) + X[k], s)
#define ROUND2(a,b,c,d,k,s) (*a) = lshift((*a) + G(*b,*c,*d) + X[k] + (__u32)0x5A827999,s)
#define ROUND3(a,b,c,d,k,s) (*a) = lshift((*a) + H(*b,*c,*d) + X[k] + (__u32)0x6ED9EBA1,s)
/* this applies md4 to 64 byte chunks */
static void
mdfour64(__u32 *M, __u32 *A, __u32 *B, __u32 *C, __u32 *D)
{
int j;
__u32 AA, BB, CC, DD;
__u32 X[16];
for (j = 0; j < 16; j++)
X[j] = M[j];
AA = *A;
BB = *B;
CC = *C;
DD = *D;
ROUND1(A, B, C, D, 0, 3);
ROUND1(D, A, B, C, 1, 7);
ROUND1(C, D, A, B, 2, 11);
ROUND1(B, C, D, A, 3, 19);
ROUND1(A, B, C, D, 4, 3);
ROUND1(D, A, B, C, 5, 7);
ROUND1(C, D, A, B, 6, 11);
ROUND1(B, C, D, A, 7, 19);
ROUND1(A, B, C, D, 8, 3);
ROUND1(D, A, B, C, 9, 7);
ROUND1(C, D, A, B, 10, 11);
ROUND1(B, C, D, A, 11, 19);
ROUND1(A, B, C, D, 12, 3);
ROUND1(D, A, B, C, 13, 7);
ROUND1(C, D, A, B, 14, 11);
ROUND1(B, C, D, A, 15, 19);
ROUND2(A, B, C, D, 0, 3);
ROUND2(D, A, B, C, 4, 5);
ROUND2(C, D, A, B, 8, 9);
ROUND2(B, C, D, A, 12, 13);
ROUND2(A, B, C, D, 1, 3);
ROUND2(D, A, B, C, 5, 5);
ROUND2(C, D, A, B, 9, 9);
ROUND2(B, C, D, A, 13, 13);
ROUND2(A, B, C, D, 2, 3);
ROUND2(D, A, B, C, 6, 5);
ROUND2(C, D, A, B, 10, 9);
ROUND2(B, C, D, A, 14, 13);
ROUND2(A, B, C, D, 3, 3);
ROUND2(D, A, B, C, 7, 5);
ROUND2(C, D, A, B, 11, 9);
ROUND2(B, C, D, A, 15, 13);
ROUND3(A, B, C, D, 0, 3);
ROUND3(D, A, B, C, 8, 9);
ROUND3(C, D, A, B, 4, 11);
ROUND3(B, C, D, A, 12, 15);
ROUND3(A, B, C, D, 2, 3);
ROUND3(D, A, B, C, 10, 9);
ROUND3(C, D, A, B, 6, 11);
ROUND3(B, C, D, A, 14, 15);
ROUND3(A, B, C, D, 1, 3);
ROUND3(D, A, B, C, 9, 9);
ROUND3(C, D, A, B, 5, 11);
ROUND3(B, C, D, A, 13, 15);
ROUND3(A, B, C, D, 3, 3);
ROUND3(D, A, B, C, 11, 9);
ROUND3(C, D, A, B, 7, 11);
ROUND3(B, C, D, A, 15, 15);
*A += AA;
*B += BB;
*C += CC;
*D += DD;
*A &= 0xFFFFFFFF;
*B &= 0xFFFFFFFF;
*C &= 0xFFFFFFFF;
*D &= 0xFFFFFFFF;
for (j = 0; j < 16; j++)
X[j] = 0;
}
static void
copy64(__u32 *M, unsigned char *in)
{
int i;
for (i = 0; i < 16; i++)
M[i] = (in[i * 4 + 3] << 24) | (in[i * 4 + 2] << 16) |
(in[i * 4 + 1] << 8) | (in[i * 4 + 0] << 0);
}
static void
copy4(unsigned char *out, __u32 x)
{
out[0] = x & 0xFF;
out[1] = (x >> 8) & 0xFF;
out[2] = (x >> 16) & 0xFF;
out[3] = (x >> 24) & 0xFF;
}
/* produce a md4 message digest from data of length n bytes */
void
mdfour(unsigned char *out, unsigned char *in, int n)
{
unsigned char buf[128];
__u32 M[16];
__u32 b = n * 8;
int i;
__u32 A = 0x67452301;
__u32 B = 0xefcdab89;
__u32 C = 0x98badcfe;
__u32 D = 0x10325476;
while (n > 64) {
copy64(M, in);
mdfour64(M, &A, &B, &C, &D);
in += 64;
n -= 64;
}
for (i = 0; i < 128; i++)
buf[i] = 0;
memcpy(buf, in, n);
buf[n] = 0x80;
if (n <= 55) {
copy4(buf + 56, b);
copy64(M, buf);
mdfour64(M, &A, &B, &C, &D);
} else {
copy4(buf + 120, b);
copy64(M, buf);
mdfour64(M, &A, &B, &C, &D);
copy64(M, buf + 64);
mdfour64(M, &A, &B, &C, &D);
}
for (i = 0; i < 128; i++)
buf[i] = 0;
copy64(M, buf);
copy4(out, A);
copy4(out + 4, B);
copy4(out + 8, C);
copy4(out + 12, D);
A = B = C = D = 0;
}
