/*  * 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 voidpermute(char *out, char *in, int *p, int n){    int i;    for (i = 0; i < n; i++)	out[i] = in[p[i] - 1];}static voidlshift(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 voidconcat(char *out, char *in1, char *in2, int l1, int l2){    while (l1--)	*out++ = *in1++;    while (l2--)	*out++ = *in2++;}static voidxor(char *out, char *in1, char *in2, int n){    int i;    for (i = 0; i < n; i++)	out[i] = in1[i] ^ in2[i];}static voiddohash(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 voidstr_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 voidsmbhash(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)));    }}voidE_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);}voidE_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);}voidcred_hash1(unsigned char *out, unsigned char *in, unsigned char *key){    unsigned char buf[8];    smbhash(buf, in, key);    smbhash(out, buf, key + 9);}voidcred_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);}