crypt/crypt-entry.c

   1 /*
   2  * UFC-crypt: ultra fast crypt(3) implementation
   3  *
   4  * Copyright (C) 1991-1993,1996-1997,2007,2012 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 #ifndef __GNU_LIBRARY__
  50 void _ufc_clearmem (char *start, int cnt);
  51 #else
  52 #define _ufc_clearmem(start, cnt)   memset(start, 0, cnt)
  53 #endif
  54 extern char *__md5_crypt_r (const char *key, const char *salt, char *buffer,
  55                             int buflen);
  56 extern char *__md5_crypt (const char *key, const char *salt);
  57 extern char *__sha256_crypt_r (const char *key, const char *salt,
  58                                char *buffer, int buflen);
  59 extern char *__sha256_crypt (const char *key, const char *salt);
  60 extern char *__sha512_crypt_r (const char *key, const char *salt,
  61                                char *buffer, int buflen);
  62 extern char *__sha512_crypt (const char *key, const char *salt);
  63
  64 /* Define our magic string to mark salt for MD5 encryption
  65    replacement.  This is meant to be the same as for other MD5 based
  66    encryption implementations.  */
  67 static const char md5_salt_prefix[] = "$1$";
  68
  69 /* Magic string for SHA256 encryption.  */
  70 static const char sha256_salt_prefix[] = "$5$";
  71
  72 /* Magic string for SHA512 encryption.  */
  73 static const char sha512_salt_prefix[] = "$6$";
  74
  75 /* For use by the old, non-reentrant routines (crypt/encrypt/setkey)  */
  76 extern struct crypt_data _ufc_foobar;
  77
  78 /*
  79  * UNIX crypt function
  80  */
  81
  82 char *
  83 __crypt_r (key, salt, data)
  84      const char *key;
  85      const char *salt;
  86      struct crypt_data * __restrict data;
  87 {
  88   ufc_long res[4];
  89   char ktab[9];
  90   ufc_long xx = 25; /* to cope with GCC long long compiler bugs */
  91
  92 #ifdef _LIBC
  93   /* Try to find out whether we have to use MD5 encryption replacement.  */
  94   if (strncmp (md5_salt_prefix, salt, sizeof (md5_salt_prefix) - 1) == 0)
  95     return __md5_crypt_r (key, salt, (char *) data,
  96                           sizeof (struct crypt_data));
  97
  98   /* Try to find out whether we have to use SHA256 encryption replacement.  */
  99   if (strncmp (sha256_salt_prefix, salt, sizeof (sha256_salt_prefix) - 1) == 0)
 100     return __sha256_crypt_r (key, salt, (char *) data,
 101                              sizeof (struct crypt_data));
 102
 103   /* Try to find out whether we have to use SHA512 encryption replacement.  */
 104   if (strncmp (sha512_salt_prefix, salt, sizeof (sha512_salt_prefix) - 1) == 0)
 105     return __sha512_crypt_r (key, salt, (char *) data,
 106                              sizeof (struct crypt_data));
 107 #endif
 108
 109   /*
 110    * Hack DES tables according to salt
 111    */
 112   _ufc_setup_salt_r (salt, data);
 113
 114   /*
 115    * Setup key schedule
 116    */
 117   _ufc_clearmem (ktab, (int) sizeof (ktab));
 118   (void) strncpy (ktab, key, 8);
 119   _ufc_mk_keytab_r (ktab, data);
 120
 121   /*
 122    * Go for the 25 DES encryptions
 123    */
 124   _ufc_clearmem ((char*) res, (int) sizeof (res));
 125   _ufc_doit_r (xx,  data, &res[0]);
 126
 127   /*
 128    * Do final permutations
 129    */
 130   _ufc_dofinalperm_r (res, data);
 131
 132   /*
 133    * And convert back to 6 bit ASCII
 134    */
 135   _ufc_output_conversion_r (res[0], res[1], salt, data);
 136   return data->crypt_3_buf;
 137 }
 138 weak_alias (__crypt_r, crypt_r)
 139
 140 char *
 141 crypt (key, salt)
 142      const char *key;
 143      const char *salt;
 144 {
 145 #ifdef _LIBC
 146   /* Try to find out whether we have to use MD5 encryption replacement.  */
 147   if (strncmp (md5_salt_prefix, salt, sizeof (md5_salt_prefix) - 1) == 0)
 148     return __md5_crypt (key, salt);
 149
 150   /* Try to find out whether we have to use SHA256 encryption replacement.  */
 151   if (strncmp (sha256_salt_prefix, salt, sizeof (sha256_salt_prefix) - 1) == 0)
 152     return __sha256_crypt (key, salt);
 153
 154   /* Try to find out whether we have to use SHA512 encryption replacement.  */
 155   if (strncmp (sha512_salt_prefix, salt, sizeof (sha512_salt_prefix) - 1) == 0)
 156     return __sha512_crypt (key, salt);
 157 #endif
 158
 159   return __crypt_r (key, salt, &_ufc_foobar);
 160 }
 161
 162
 163 /*
 164  * To make fcrypt users happy.
 165  * They don't need to call init_des.
 166  */
 167 #ifdef _LIBC
 168 weak_alias (crypt, fcrypt)
 169 #else
 170 char *
 171 __fcrypt (key, salt)
 172      const char *key;
 173      const char *salt;
 174 {
 175   return crypt (key, salt);
 176 }
 177 #endif