lib/libcrypto/des/fcrypt.c

   1 /* $OpenBSD: fcrypt.c,v 1.12 2016/12/26 21:30:10 jca Exp $ */
   2
   3 #include <stdio.h>
   4
   5 /* This version of crypt has been developed from my MIT compatible
   6  * DES library.
   7  * Eric Young (eay@cryptsoft.com)
   8  */
   9
  10 /* Modification by Jens Kupferschmidt (Cu)
  11  * I have included directive PARA for shared memory computers.
  12  * I have included a directive LONGCRYPT to using this routine to cipher
  13  * passwords with more than 8 bytes like HP-UX 10.x it used. The MAXPLEN
  14  * definition is the maximum of length of password and can changed. I have
  15  * defined 24.
  16  */
  17
  18 #include "des_locl.h"
  19
  20 /* Added more values to handle illegal salt values the way normal
  21  * crypt() implementations do.  The patch was sent by
  22  * Bjorn Gronvall <bg@sics.se>
  23  */
  24 static unsigned const char con_salt[128]={
  25 0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,
  26 0xDA,0xDB,0xDC,0xDD,0xDE,0xDF,0xE0,0xE1,
  27 0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,
  28 0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,
  29 0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,
  30 0xFA,0xFB,0xFC,0xFD,0xFE,0xFF,0x00,0x01,
  31 0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,
  32 0x0A,0x0B,0x05,0x06,0x07,0x08,0x09,0x0A,
  33 0x0B,0x0C,0x0D,0x0E,0x0F,0x10,0x11,0x12,
  34 0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1A,
  35 0x1B,0x1C,0x1D,0x1E,0x1F,0x20,0x21,0x22,
  36 0x23,0x24,0x25,0x20,0x21,0x22,0x23,0x24,
  37 0x25,0x26,0x27,0x28,0x29,0x2A,0x2B,0x2C,
  38 0x2D,0x2E,0x2F,0x30,0x31,0x32,0x33,0x34,
  39 0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,0x3C,
  40 0x3D,0x3E,0x3F,0x40,0x41,0x42,0x43,0x44,
  41 };
  42
  43 static unsigned const char cov_2char[64]={
  44 0x2E,0x2F,0x30,0x31,0x32,0x33,0x34,0x35,
  45 0x36,0x37,0x38,0x39,0x41,0x42,0x43,0x44,
  46 0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,
  47 0x4D,0x4E,0x4F,0x50,0x51,0x52,0x53,0x54,
  48 0x55,0x56,0x57,0x58,0x59,0x5A,0x61,0x62,
  49 0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,
  50 0x6B,0x6C,0x6D,0x6E,0x6F,0x70,0x71,0x72,
  51 0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A
  52 };
  53
  54 char *DES_crypt(const char *buf, const char *salt)
  55         {
  56         static char buff[14];
  57
  58         return(DES_fcrypt(buf,salt,buff));
  59         }
  60
  61
  62 char *DES_fcrypt(const char *buf, const char *salt, char *ret)
  63         {
  64         unsigned int i,j,x,y;
  65         DES_LONG Eswap0,Eswap1;
  66         DES_LONG out[2],ll;
  67         DES_cblock key;
  68         DES_key_schedule ks;
  69         unsigned char bb[9];
  70         unsigned char *b=bb;
  71         unsigned char c,u;
  72
  73         /* eay 25/08/92
  74          * If you call crypt("pwd","*") as often happens when you
  75          * have * as the pwd field in /etc/passwd, the function
  76          * returns *\0xxxxxxxxx
  77          * The \0 makes the string look like * so the pwd "*" would
  78          * crypt to "*".  This was found when replacing the crypt in
  79          * our shared libraries.  People found that the disabled
  80          * accounts effectively had no passwd :-(. */
  81         x=ret[0]=((salt[0] == '\0')?'A':salt[0]);
  82         Eswap0=con_salt[x]<<2;
  83         x=ret[1]=((salt[1] == '\0')?'A':salt[1]);
  84         Eswap1=con_salt[x]<<6;
  85 /* EAY
  86 r=strlen(buf);
  87 r=(r+7)/8;
  88 */
  89         for (i=0; i<8; i++)
  90                 {
  91                 c= *(buf++);
  92                 if (!c) break;
  93                 key[i]=(c<<1);
  94                 }
  95         for (; i<8; i++)
  96                 key[i]=0;
  97
  98         DES_set_key_unchecked(&key,&ks);
  99         fcrypt_body(&(out[0]),&ks,Eswap0,Eswap1);
 100
 101         ll=out[0]; l2c(ll,b);
 102         ll=out[1]; l2c(ll,b);
 103         y=0;
 104         u=0x80;
 105         bb[8]=0;
 106         for (i=2; i<13; i++)
 107                 {
 108                 c=0;
 109                 for (j=0; j<6; j++)
 110                         {
 111                         c<<=1;
 112                         if (bb[y] & u) c|=1;
 113                         u>>=1;
 114                         if (!u)
 115                                 {
 116                                 y++;
 117                                 u=0x80;
 118                                 }
 119                         }
 120                 ret[i]=cov_2char[c];
 121                 }
 122         ret[13]='\0';
 123         return(ret);
 124         }
 125