/*
Unix SMB/Netbios implementation.
Version 1.9.
a partial implementation of DES designed for use in the
SMB authentication protocol
Copyright (C) Andrew Tridgell 1997
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.
*/
/* NOTES:
This code makes no attempt to be fast! In fact, it is a very
slow implementation
This code is NOT a complete DES implementation. It implements only
the minimum necessary for SMB authentication, as used by all SMB
products (including every copy of Microsoft Windows95 ever sold)
In particular, it can only do a unchained forward DES pass. This
means it is not possible to use this code for encryption/decryption
of data, instead it is only useful as a "hash" algorithm.
There is no entry point into this code that allows normal DES operation.
I believe this means that this code does not come under ITAR
regulations but this is NOT a legal opinion. If you are concerned
about the applicability of ITAR regulations to this code then you
should confirm it for yourself (and maybe let me know if you come
up with a different answer to the one above)
*/
static int perm1[56] = {57, 49, 41, 33, 25, 17, 9,
1, 58, 50, 42, 34, 26, 18,
10, 2, 59, 51, 43, 35, 27,
19, 11, 3, 60, 52, 44, 36,
63, 55, 47, 39, 31, 23, 15,
7, 62, 54, 46, 38, 30, 22,
14, 6, 61, 53, 45, 37, 29,
21, 13, 5, 28, 20, 12, 4};
static int perm2[48] = {14, 17, 11, 24, 1, 5,
3, 28, 15, 6, 21, 10,
23, 19, 12, 4, 26, 8,
16, 7, 27, 20, 13, 2,
41, 52, 31, 37, 47, 55,
30, 40, 51, 45, 33, 48,
44, 49, 39, 56, 34, 53,
46, 42, 50, 36, 29, 32};
static int perm3[64] = {58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6,
64, 56, 48, 40, 32, 24, 16, 8,
57, 49, 41, 33, 25, 17, 9, 1,
59, 51, 43, 35, 27, 19, 11, 3,
61, 53, 45, 37, 29, 21, 13, 5,
63, 55, 47, 39, 31, 23, 15, 7};
static int perm4[48] = { 32, 1, 2, 3, 4, 5,
4, 5, 6, 7, 8, 9,
8, 9, 10, 11, 12, 13,
12, 13, 14, 15, 16, 17,
16, 17, 18, 19, 20, 21,
20, 21, 22, 23, 24, 25,
24, 25, 26, 27, 28, 29,
28, 29, 30, 31, 32, 1};
static int perm5[32] = { 16, 7, 20, 21,
29, 12, 28, 17,
1, 15, 23, 26,
5, 18, 31, 10,
2, 8, 24, 14,
32, 27, 3, 9,
19, 13, 30, 6,
22, 11, 4, 25};
static int perm6[64] ={ 40, 8, 48, 16, 56, 24, 64, 32,
39, 7, 47, 15, 55, 23, 63, 31,
38, 6, 46, 14, 54, 22, 62, 30,
37, 5, 45, 13, 53, 21, 61, 29,
36, 4, 44, 12, 52, 20, 60, 28,
35, 3, 43, 11, 51, 19, 59, 27,
34, 2, 42, 10, 50, 18, 58, 26,
33, 1, 41, 9, 49, 17, 57, 25};
static int sc[16] = {1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1};
static int sbox[8][4][16] = {
{{14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7},
{0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8},
{4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0},
{15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13}},
{{15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10},
{3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5},
{0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15},
{13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9}},
{{10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8},
{13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1},
{13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7},
{1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12}},
{{7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15},
{13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9},
{10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4},
{3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14}},
{{2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9},
{14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6},
{4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14},
{11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3}},
{{12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11},
{10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8},
{9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6},
{4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13}},
{{4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1},
{13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6},
{1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2},
{6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12}},
{{13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7},
{1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2},
{7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8},
{2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11}}};
static void permute(char *out, char *in, int *p, int n)
{
int i;
for (i=0;i<n;i++)
out[i] = in[p[i]-1];
}
static void lshift(char *d, int count, int n)
{
char out[64];
int i;
for (i=0;i<n;i++)
out[i] = d[(i+count)%n];
for (i=0;i<n;i++)
d[i] = out[i];
}
static void concat(char *out, char *in1, char *in2, int l1, int l2)
{
while (l1--)
*out++ = *in1++;
while (l2--)
*out++ = *in2++;
}
static void xor(char *out, char *in1, char *in2, int n)
{
int i;
for (i=0;i<n;i++)
out[i] = in1[i] ^ in2[i];
}
static void dohash(char *out, char *in, char *key)
{
int i, j, k;
char pk1[56];
char c[28];
char d[28];
char cd[56];
char ki[16][48];
char pd1[64];
char l[32], r[32];
char rl[64];
permute(pk1, key, perm1, 56);
for (i=0;i<28;i++)
c[i] = pk1[i];
for (i=0;i<28;i++)
d[i] = pk1[i+28];
for (i=0;i<16;i++) {
lshift(c, sc[i], 28);
lshift(d, sc[i], 28);
concat(cd, c, d, 28, 28);
permute(ki[i], cd, perm2, 48);
}
permute(pd1, in, perm3, 64);
for (j=0;j<32;j++) {
l[j] = pd1[j];
r[j] = pd1[j+32];
}
for (i=0;i<16;i++) {
char er[48];
char erk[48];
char b[8][6];
char cb[32];
char pcb[32];
char r2[32];
permute(er, r, perm4, 48);
xor(erk, er, ki[i], 48);
for (j=0;j<8;j++)
for (k=0;k<6;k++)
b[j][k] = erk[j*6 + k];
for (j=0;j<8;j++) {
int m, n;
m = (b[j][0]<<1) | b[j][5];
n = (b[j][1]<<3) | (b[j][2]<<2) | (b[j][3]<<1) | b[j][4];
for (k=0;k<4;k++)
b[j][k] = (sbox[j][m][n] & (1<<(3-k)))?1:0;
}
for (j=0;j<8;j++)
for (k=0;k<4;k++)
cb[j*4+k] = b[j][k];
permute(pcb, cb, perm5, 32);
xor(r2, l, pcb, 32);
for (j=0;j<32;j++)
l[j] = r[j];
for (j=0;j<32;j++)
r[j] = r2[j];
}
concat(rl, r, l, 32, 32);
permute(out, rl, perm6, 64);
}
static void str_to_key(unsigned char *str,unsigned char *key)
{
int i;
key[0] = str[0]>>1;
key[1] = ((str[0]&0x01)<<6) | (str[1]>>2);
key[2] = ((str[1]&0x03)<<5) | (str[2]>>3);
key[3] = ((str[2]&0x07)<<4) | (str[3]>>4);
key[4] = ((str[3]&0x0F)<<3) | (str[4]>>5);
key[5] = ((str[4]&0x1F)<<2) | (str[5]>>6);
key[6] = ((str[5]&0x3F)<<1) | (str[6]>>7);
key[7] = str[6]&0x7F;
for (i=0;i<8;i++) {
key[i] = (key[i]<<1);
}
}
static void smbhash(unsigned char *out, unsigned char *in, unsigned char *key)
{
int i;
char outb[64];
char inb[64];
char keyb[64];
unsigned char key2[8];
str_to_key(key, key2);
for (i=0;i<64;i++) {
inb[i] = (in[i/8] & (1<<(7-(i%8)))) ? 1 : 0;
keyb[i] = (key2[i/8] & (1<<(7-(i%8)))) ? 1 : 0;
outb[i] = 0;
}
dohash(outb, inb, keyb);
for (i=0;i<8;i++) {
out[i] = 0;
}
for (i=0;i<64;i++) {
if (outb[i])
out[i/8] |= (1<<(7-(i%8)));
}
}
void E_P16(unsigned char *p14,unsigned char *p16)
{
unsigned char sp8[8] = {0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25};
smbhash(p16, sp8, p14);
smbhash(p16+8, sp8, p14+7);
}
void E_P24(unsigned char *p21, unsigned char *c8, unsigned char *p24)
{
smbhash(p24, c8, p21);
smbhash(p24+8, c8, p21+7);
smbhash(p24+16, c8, p21+14);
}
void cred_hash1(unsigned char *out,unsigned char *in,unsigned char *key)
{
unsigned char buf[8];
smbhash(buf, in, key);
smbhash(out, buf, key+9);
}
void cred_hash2(unsigned char *out,unsigned char *in,unsigned char *key)
{
unsigned char buf[8];
static unsigned char key2[8];
smbhash(buf, in, key);
key2[0] = key[7];
smbhash(out, buf, key2);
}