source/libsmb/smbencrypt.c

   1 #ifdef SMB_PASSWD
   2 /*
   3    Unix SMB/Netbios implementation.
   4    Version 1.9.
   5    SMB parameters and setup
   6    Copyright (C) Andrew Tridgell 1992-1995
   7    Modified by Jeremy Allison 1995.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25 #include "des.h"
  26 #include "md4.h"
  27
  28 extern int DEBUGLEVEL;
  29
  30 #include "byteorder.h"
  31
  32 void str_to_key(uchar *str,uchar *key)
  33 {
  34   void des_set_odd_parity(des_cblock *);
  35   int i;
  36
  37   key[0] = str[0]>>1;
  38   key[1] = ((str[0]&0x01)<<6) | (str[1]>>2);
  39   key[2] = ((str[1]&0x03)<<5) | (str[2]>>3);
  40   key[3] = ((str[2]&0x07)<<4) | (str[3]>>4);
  41   key[4] = ((str[3]&0x0F)<<3) | (str[4]>>5);
  42   key[5] = ((str[4]&0x1F)<<2) | (str[5]>>6);
  43   key[6] = ((str[5]&0x3F)<<1) | (str[6]>>7);
  44   key[7] = str[6]&0x7F;
  45   for (i=0;i<8;i++) {
  46     key[i] = (key[i]<<1);
  47   }
  48   des_set_odd_parity((des_cblock *)key);
  49 }
  50
  51 void D1(uchar *k, uchar *d, uchar *out)
  52 {
  53   des_key_schedule ks;
  54   des_cblock deskey;
  55
  56   str_to_key(k,(uchar *)deskey);
  57   des_set_key(deskey,ks);
  58   des_ecb_encrypt(d, out, ks, DES_DECRYPT);
  59 }
  60
  61 void E1(uchar *k, uchar *d, uchar *out)
  62 {
  63   des_key_schedule ks;
  64   des_cblock deskey;
  65
  66   str_to_key(k,(uchar *)deskey);
  67   des_set_key(deskey,ks);
  68   des_ecb_encrypt(d, out, ks, DES_ENCRYPT);
  69 }
  70
  71 void E_P16(uchar *p14,uchar *p16)
  72 {
  73   uchar sp7[7];
  74   /* the following constant makes us compatible with other
  75   implementations. Note that publishing this constant does not reduce the
  76   security of the encryption mechanism */
  77   uchar sp8[] = {0xAA,0xD3,0xB4,0x35,0xB5,0x14,0x4,0xEE};
  78   uchar x[8];
  79
  80   memset(sp7,'\0',7);
  81
  82   D1(sp7, sp8, x);
  83   E1(p14, x, p16);
  84   E1(p14+7, x, p16+8);
  85 }
  86
  87 void E_P24(uchar *p21, uchar *c8, uchar *p24)
  88 {
  89   E1(p21, c8, p24);
  90   E1(p21+7, c8, p24+8);
  91   E1(p21+14, c8, p24+16);
  92 }
  93
  94
  95 /*
  96    This implements the X/Open SMB password encryption
  97    It takes a password, a 8 byte "crypt key" and puts 24 bytes of
  98    encrypted password into p24 */
  99 void SMBencrypt(uchar *passwd, uchar *c8, uchar *p24)
 100 {
 101   uchar p14[15], p21[21];
 102
 103   memset(p21,'\0',21);
 104   memset(p14,'\0',14);
 105   StrnCpy((char *)p14,(char *)passwd,14);
 106
 107   strupper((char *)p14);
 108   E_P16(p14, p21);
 109   E_P24(p21, c8, p24);
 110 }
 111
 112 /* Routines for Windows NT MD4 Hash functions. */
 113 static int _my_wcslen(int16 *str)
 114 {
 115         int len = 0;
 116         while(*str++ != 0)
 117                 len++;
 118         return len;
 119 }
 120
 121 /*
 122  * Convert a string into an NT UNICODE string.
 123  * Note that regardless of processor type
 124  * this must be in intel (little-endian)
 125  * format.
 126  */
 127
 128 static int _my_mbstowcs(int16 *dst, uchar *src, int len)
 129 {
 130         int i;
 131         int16 val;
 132
 133         for(i = 0; i < len; i++) {
 134                 val = *src;
 135                 SSVAL(dst,0,val);
 136                 dst++;
 137                 src++;
 138                 if(val == 0)
 139                         break;
 140         }
 141         return i;
 142 }
 143
 144 /*
 145  * Creates the MD4 Hash of the users password in NT UNICODE.
 146  */
 147
 148 void E_md4hash(uchar *passwd, uchar *p16)
 149 {
 150         int i, len;
 151         int16 wpwd[129];
 152         MDstruct MD;
 153
 154         /* Password cannot be longer than 128 characters */
 155         len = strlen((char *)passwd);
 156         if(len > 128)
 157                 len = 128;
 158         /* Password must be converted to NT unicode */
 159         _my_mbstowcs( wpwd, passwd, len);
 160         wpwd[len] = 0; /* Ensure string is null terminated */
 161         /* Calculate length in bytes */
 162         len = _my_wcslen(wpwd) * sizeof(int16);
 163
 164         MDbegin(&MD);
 165         for(i = 0; i + 64 <= len; i += 64)
 166                 MDupdate(&MD,wpwd + (i/2), 512);
 167         MDupdate(&MD,wpwd + (i/2),(len-i)*8);
 168         SIVAL(p16,0,MD.buffer[0]);
 169         SIVAL(p16,4,MD.buffer[1]);
 170         SIVAL(p16,8,MD.buffer[2]);
 171         SIVAL(p16,12,MD.buffer[3]);
 172 }
 173
 174 /* Does the NT MD4 hash then des encryption. */
 175
 176 void SMBNTencrypt(uchar *passwd, uchar *c8, uchar *p24)
 177 {
 178         uchar p21[21];
 179
 180         memset(p21,'\0',21);
 181
 182         E_md4hash(passwd, p21);
 183         E_P24(p21, c8, p24);
 184 }
 185
 186 #else
 187  void smbencrypt_dummy(void){}
 188 #endif