crypto/des/fcrypt.c

   1 /* NOCW */
   2 #include <stdio.h>
   3
   4 /* This version of crypt has been developed from my MIT compatable
   5  * DES library.
   6  * The library is available at pub/Crypto/DES at ftp.psy.uq.oz.au
   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 then 8 bytes like HP-UX 10.x it used. The MAXPLEN
  14  * definition is the maximum of lenght 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 void fcrypt_body(DES_LONG *out,des_key_schedule ks,
  55         DES_LONG Eswap0, DES_LONG Eswap1);
  56
  57 #if defined(PERL5) || defined(__FreeBSD__)
  58 char *des_crypt(const char *buf,const char *salt);
  59 #else
  60 char *crypt(const char *buf,const char *salt);
  61 #endif
  62 #if defined(PERL5) || defined(__FreeBSD__)
  63 char *des_crypt(const char *buf, const char *salt)
  64 #else
  65 char *crypt(const char *buf, const char *salt)
  66 #endif
  67         {
  68         static char buff[14];
  69
  70         return(des_fcrypt(buf,salt,buff));
  71         }
  72
  73
  74 char *des_fcrypt(const char *buf, const char *salt, char *ret)
  75         {
  76         unsigned int i,j,x,y;
  77         DES_LONG Eswap0,Eswap1;
  78         DES_LONG out[2],ll;
  79         des_cblock key;
  80         des_key_schedule ks;
  81         unsigned char bb[9];
  82         unsigned char *b=bb;
  83         unsigned char c,u;
  84
  85         /* eay 25/08/92
  86          * If you call crypt("pwd","*") as often happens when you
  87          * have * as the pwd field in /etc/passwd, the function
  88          * returns *\0XXXXXXXXX
  89          * The \0 makes the string look like * so the pwd "*" would
  90          * crypt to "*".  This was found when replacing the crypt in
  91          * our shared libraries.  People found that the disbled
  92          * accounts effectivly had no passwd :-(. */
  93         x=ret[0]=((salt[0] == '\0')?'A':salt[0]);
  94         Eswap0=con_salt[x]<<2;
  95         x=ret[1]=((salt[1] == '\0')?'A':salt[1]);
  96         Eswap1=con_salt[x]<<6;
  97
  98 /* EAY
  99 r=strlen(buf);
 100 r=(r+7)/8;
 101 */
 102         for (i=0; i<8; i++)
 103                 {
 104                 c= *(buf++);
 105                 if (!c) break;
 106                 key[i]=(c<<1);
 107                 }
 108         for (; i<8; i++)
 109                 key[i]=0;
 110
 111         des_set_key(key,ks);
 112         fcrypt_body(&(out[0]),ks,Eswap0,Eswap1);
 113
 114         ll=out[0]; l2c(ll,b);
 115         ll=out[1]; l2c(ll,b);
 116         y=0;
 117         u=0x80;
 118         bb[8]=0;
 119         for (i=2; i<13; i++)
 120                 {
 121                 c=0;
 122                 for (j=0; j<6; j++)
 123                         {
 124                         c<<=1;
 125                         if (bb[y] & u) c|=1;
 126                         u>>=1;
 127                         if (!u)
 128                                 {
 129                                 y++;
 130                                 u=0x80;
 131                                 }
 132                         }
 133                 ret[i]=cov_2char[c];
 134                 }
 135         ret[13]='\0';
 136         return(ret);
 137         }
 138