crypt/crypt-entry.c

   1 /*
   2  * UFC-crypt: ultra fast crypt(3) implementation
   3  *
   4  * Copyright (C) 1991, 1992, 1993, 1996, 1997 Free Software Foundation, Inc.
   5  *
   6  * The GNU C Library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * The GNU C Library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with the GNU C Library; if not, write to the Free
  18  * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19  * 02111-1307 USA.
  20  *
  21  * crypt entry points
  22  *
  23  * @(#)crypt-entry.c    1.2 12/20/96
  24  *
  25  */
  26
  27 #ifdef DEBUG
  28 #include <stdio.h>
  29 #endif
  30 #include <string.h>
  31
  32 #ifndef STATIC
  33 #define STATIC static
  34 #endif
  35
  36 #ifndef DOS
  37 #include "ufc-crypt.h"
  38 #else
  39 /*
  40  * Thanks to greg%wind@plains.NoDak.edu (Greg W. Wettstein)
  41  * for DOS patches
  42  */
  43 #include "ufc.h"
  44 #endif
  45 #include "crypt.h"
  46 #include "crypt-private.h"
  47
  48 /* Prototypes for local functions.  */
  49 #if __STDC__ - 0
  50 #ifndef __GNU_LIBRARY__
  51 void _ufc_clearmem (char *start, int cnt);
  52 #else
  53 #define _ufc_clearmem(start, cnt)   memset(start, 0, cnt)
  54 #endif
  55 extern char *__md5_crypt_r (const char *key, const char *salt, char *buffer,
  56                             int buflen);
  57 extern char *__md5_crypt (const char *key, const char *salt);
  58 #endif
  59
  60 /* Define our magic string to mark salt for MD5 encryption
  61    replacement.  This is meant to be the same as for other MD5 based
  62    encryption implementations.  */
  63 static const char md5_salt_prefix[] = "$1$";
  64
  65 /* For use by the old, non-reentrant routines (crypt/encrypt/setkey)  */
  66 extern struct crypt_data _ufc_foobar;
  67
  68 /*
  69  * UNIX crypt function
  70  */
  71
  72 char *
  73 __crypt_r (key, salt, data)
  74      const char *key;
  75      const char *salt;
  76      struct crypt_data * __restrict data;
  77 {
  78   ufc_long res[4];
  79   char ktab[9];
  80   ufc_long xx = 25; /* to cope with GCC long long compiler bugs */
  81
  82 #ifdef _LIBC
  83   /* Try to find out whether we have to use MD5 encryption replacement.  */
  84   if (strncmp (md5_salt_prefix, salt, sizeof (md5_salt_prefix) - 1) == 0)
  85     return __md5_crypt_r (key, salt, (char *) data,
  86                           sizeof (struct crypt_data));
  87 #endif
  88
  89   /*
  90    * Hack DES tables according to salt
  91    */
  92   _ufc_setup_salt_r (salt, data);
  93
  94   /*
  95    * Setup key schedule
  96    */
  97   _ufc_clearmem (ktab, (int) sizeof (ktab));
  98   (void) strncpy (ktab, key, 8);
  99   _ufc_mk_keytab_r (ktab, data);
 100
 101   /*
 102    * Go for the 25 DES encryptions
 103    */
 104   _ufc_clearmem ((char*) res, (int) sizeof (res));
 105   _ufc_doit_r (xx,  data, &res[0]);
 106
 107   /*
 108    * Do final permutations
 109    */
 110   _ufc_dofinalperm_r (res, data);
 111
 112   /*
 113    * And convert back to 6 bit ASCII
 114    */
 115   _ufc_output_conversion_r (res[0], res[1], salt, data);
 116   return data->crypt_3_buf;
 117 }
 118 weak_alias (__crypt_r, crypt_r)
 119
 120 char *
 121 crypt (key, salt)
 122      const char *key;
 123      const char *salt;
 124 {
 125 #ifdef _LIBC
 126   /* Try to find out whether we have to use MD5 encryption replacement.  */
 127   if (strncmp (md5_salt_prefix, salt, sizeof (md5_salt_prefix) - 1) == 0)
 128     return __md5_crypt (key, salt);
 129 #endif
 130
 131   return __crypt_r (key, salt, &_ufc_foobar);
 132 }
 133
 134
 135 /*
 136  * To make fcrypt users happy.
 137  * They don't need to call init_des.
 138  */
 139 #ifdef _LIBC
 140 weak_alias (crypt, fcrypt)
 141 #else
 142 char *
 143 __fcrypt (key, salt)
 144      const char *key;
 145      const char *salt;
 146 {
 147   return crypt (key, salt);
 148 }
 149 #endif