linux/crypto/ciphers/des/fcrypt.c

   1 /* NOCW */
   2
   3 /* This version of crypt has been developed from my MIT compatable
   4  * DES library.
   5  * The library is available at pub/Crypto/DES at ftp.psy.uq.oz.au
   6  * Eric Young (eay@cryptsoft.com)
   7  */
   8
   9 /* Modification by Jens Kupferschmidt (Cu)
  10  * I have included directive PARA for shared memory computers.
  11  * I have included a directive LONGCRYPT to using this routine to cipher
  12  * passwords with more then 8 bytes like HP-UX 10.x it used. The MAXPLEN
  13  * definition is the maximum of lenght of password and can changed. I have
  14  * defined 24.
  15  */
  16
  17 #include "des_locl.h"
  18
  19 /* Added more values to handle illegal salt values the way normal
  20  * crypt() implementations do.  The patch was sent by
  21  * Bjorn Gronvall <bg@sics.se>
  22  */
  23 static unsigned const char con_salt[128]={
  24 0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,
  25 0xDA,0xDB,0xDC,0xDD,0xDE,0xDF,0xE0,0xE1,
  26 0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,
  27 0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,
  28 0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,
  29 0xFA,0xFB,0xFC,0xFD,0xFE,0xFF,0x00,0x01,
  30 0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,
  31 0x0A,0x0B,0x05,0x06,0x07,0x08,0x09,0x0A,
  32 0x0B,0x0C,0x0D,0x0E,0x0F,0x10,0x11,0x12,
  33 0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1A,
  34 0x1B,0x1C,0x1D,0x1E,0x1F,0x20,0x21,0x22,
  35 0x23,0x24,0x25,0x20,0x21,0x22,0x23,0x24,
  36 0x25,0x26,0x27,0x28,0x29,0x2A,0x2B,0x2C,
  37 0x2D,0x2E,0x2F,0x30,0x31,0x32,0x33,0x34,
  38 0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,0x3C,
  39 0x3D,0x3E,0x3F,0x40,0x41,0x42,0x43,0x44,
  40 };
  41
  42 static unsigned const char cov_2char[64]={
  43 0x2E,0x2F,0x30,0x31,0x32,0x33,0x34,0x35,
  44 0x36,0x37,0x38,0x39,0x41,0x42,0x43,0x44,
  45 0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,
  46 0x4D,0x4E,0x4F,0x50,0x51,0x52,0x53,0x54,
  47 0x55,0x56,0x57,0x58,0x59,0x5A,0x61,0x62,
  48 0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,
  49 0x6B,0x6C,0x6D,0x6E,0x6F,0x70,0x71,0x72,
  50 0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A
  51 };
  52
  53 #ifndef NOPROTO
  54 void fcrypt_body(DES_LONG *out,des_key_schedule ks,
  55         DES_LONG Eswap0, DES_LONG Eswap1);
  56
  57 #ifdef PERL5
  58 char *des_crypt(const char *buf,const char *salt);
  59 #else
  60 char *crypt(const char *buf,const char *salt);
  61 #endif
  62 #else
  63 void fcrypt_body();
  64 #ifdef PERL5
  65 char *des_crypt();
  66 #else
  67 char *crypt();
  68 #endif
  69 #endif
  70
  71 #ifdef PERL5
  72 char *des_crypt(buf,salt)
  73 #else
  74 char *crypt(buf,salt)
  75 #endif
  76 const char *buf;
  77 const char *salt;
  78         {
  79         static char buff[14];
  80
  81         return(des_fcrypt(buf,salt,buff));
  82         }
  83
  84
  85 char *des_fcrypt(buf,salt,ret)
  86 const char *buf;
  87 const char *salt;
  88 char *ret;
  89         {
  90         unsigned int i,j,x,y;
  91         DES_LONG Eswap0,Eswap1;
  92         DES_LONG out[2],ll;
  93         des_cblock key;
  94         des_key_schedule ks;
  95         unsigned char bb[9];
  96         unsigned char *b=bb;
  97         unsigned char c,u;
  98
  99         /* eay 25/08/92
 100          * If you call crypt("pwd","*") as often happens when you
 101          * have * as the pwd field in /etc/passwd, the function
 102          * returns *\0XXXXXXXXX
 103          * The \0 makes the string look like * so the pwd "*" would
 104          * crypt to "*".  This was found when replacing the crypt in
 105          * our shared libraries.  People found that the disbled
 106          * accounts effectivly had no passwd :-(. */
 107         x=ret[0]=((salt[0] == '\0')?'A':salt[0]);
 108         Eswap0=con_salt[x]<<2;
 109         x=ret[1]=((salt[1] == '\0')?'A':salt[1]);
 110         Eswap1=con_salt[x]<<6;
 111
 112 /* EAY
 113 r=strlen(buf);
 114 r=(r+7)/8;
 115 */
 116         for (i=0; i<8; i++)
 117                 {
 118                 c= *(buf++);
 119                 if (!c) break;
 120                 key[i]=(c<<1);
 121                 }
 122         for (; i<8; i++)
 123                 key[i]=0;
 124
 125         des_set_key((des_cblock *)(key),ks);
 126         fcrypt_body(&(out[0]),ks,Eswap0,Eswap1);
 127
 128         ll=out[0]; l2c(ll,b);
 129         ll=out[1]; l2c(ll,b);
 130         y=0;
 131         u=0x80;
 132         bb[8]=0;
 133         for (i=2; i<13; i++)
 134                 {
 135                 c=0;
 136                 for (j=0; j<6; j++)
 137                         {
 138                         c<<=1;
 139                         if (bb[y] & u) c|=1;
 140                         u>>=1;
 141                         if (!u)
 142                                 {
 143                                 y++;
 144                                 u=0x80;
 145                                 }
 146                         }
 147                 ret[i]=cov_2char[c];
 148                 }
 149         ret[13]='\0';
 150         return(ret);
 151         }
 152