sunrpc/des_crypt.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  */
  29 #if !defined(lint) && defined(SCCSID)
  30 static char sccsid[] = "@(#)des_crypt.c 2.2 88/08/10 4.0 RPCSRC; from 1.13 88/02/08 SMI";
  31 #endif
  32 /*
  33  * des_crypt.c, DES encryption library routines
  34  * Copyright (C) 1986, Sun Microsystems, Inc.
  35  */
  36
  37 #include <sys/types.h>
  38 #include <rpc/des_crypt.h>
  39 #include "des.h"
  40
  41 extern int _des_crypt (char *, unsigned, struct desparams *);
  42
  43 /*
  44  * Copy 8 bytes
  45  */
  46 #define COPY8(src, dst) { \
  47         register char *a = (char *) dst; \
  48         register char *b = (char *) src; \
  49         *a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
  50         *a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
  51 }
  52
  53 /*
  54  * Copy multiple of 8 bytes
  55  */
  56 #define DESCOPY(src, dst, len) { \
  57         register char *a = (char *) dst; \
  58         register char *b = (char *) src; \
  59         register int i; \
  60         for (i = (int) len; i > 0; i -= 8) { \
  61                 *a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
  62                 *a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
  63         } \
  64 }
  65
  66 /*
  67  * Common code to cbc_crypt() & ecb_crypt()
  68  */
  69 static int
  70 common_crypt (char *key, char *buf, register unsigned len,
  71               unsigned mode, register struct desparams *desp)
  72 {
  73   register int desdev;
  74
  75   if ((len % 8) != 0 || len > DES_MAXDATA)
  76     return DESERR_BADPARAM;
  77
  78   desp->des_dir =
  79     ((mode & DES_DIRMASK) == DES_ENCRYPT) ? ENCRYPT : DECRYPT;
  80
  81   desdev = mode & DES_DEVMASK;
  82   COPY8 (key, desp->des_key);
  83   /*
  84    * software
  85    */
  86   if (!_des_crypt (buf, len, desp))
  87     return DESERR_HWERROR;
  88
  89   return desdev == DES_SW ? DESERR_NONE : DESERR_NOHWDEVICE;
  90 }
  91
  92 /*
  93  * CBC mode encryption
  94  */
  95 int
  96 cbc_crypt (char *key, char *buf, unsigned int len, unsigned int mode,
  97            char *ivec)
  98 {
  99   int err;
 100   struct desparams dp;
 101
 102   dp.des_mode = CBC;
 103   COPY8 (ivec, dp.des_ivec);
 104   err = common_crypt (key, buf, len, mode, &dp);
 105   COPY8 (dp.des_ivec, ivec);
 106   return err;
 107 }
 108 libc_hidden_def (cbc_crypt)
 109
 110 /*
 111  * ECB mode encryption
 112  */
 113 int
 114 ecb_crypt (char *key, char *buf, unsigned int len, unsigned int mode)
 115 {
 116   struct desparams dp;
 117
 118   dp.des_mode = ECB;
 119   return common_crypt (key, buf, len, mode, &dp);
 120 }
 121 libc_hidden_def (ecb_crypt)