lib/libc/rpc/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  * @(#)des_crypt.c      2.2 88/08/10 4.0 RPCSRC; from 1.13 88/02/08 SMI
  30  * $FreeBSD: src/lib/libc/rpc/des_crypt.c,v 1.3 1999/08/28 00:00:38 peter Exp $
  31  * $DragonFly: src/lib/libc/rpc/des_crypt.c,v 1.5 2005/11/13 12:27:04 swildner Exp $
  32  */
  33 /*
  34  * des_crypt.c, DES encryption library routines
  35  * Copyright (C) 1986, Sun Microsystems, Inc.
  36  */
  37
  38 #include <sys/types.h>
  39 #include <rpc/des_crypt.h>
  40 #include <rpc/des.h>
  41
  42 static int common_crypt ( char *, char *, unsigned, unsigned, struct desparams * );
  43 int (*__des_crypt_LOCAL)() = 0;
  44 extern int _des_crypt_call( char *, int, struct desparams * );
  45 /*
  46  * Copy 8 bytes
  47  */
  48 #define COPY8(src, dst) { \
  49         char *a = (char *) dst; \
  50         char *b = (char *) src; \
  51         *a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
  52         *a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
  53 }
  54
  55 /*
  56  * Copy multiple of 8 bytes
  57  */
  58 #define DESCOPY(src, dst, len) { \
  59         char *a = (char *) dst; \
  60         char *b = (char *) src; \
  61         int i; \
  62         for (i = (int) len; i > 0; i -= 8) { \
  63                 *a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
  64                 *a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
  65         } \
  66 }
  67
  68 /*
  69  * CBC mode encryption
  70  */
  71 int
  72 cbc_crypt(char *key, char *buf, unsigned len, unsigned mode, char *ivec)
  73 {
  74         int err;
  75         struct desparams dp;
  76
  77 #ifdef BROKEN_DES
  78         dp.UDES.UDES_buf = buf;
  79         dp.des_mode = ECB;
  80 #else
  81         dp.des_mode = CBC;
  82 #endif
  83         COPY8(ivec, dp.des_ivec);
  84         err = common_crypt(key, buf, len, mode, &dp);
  85         COPY8(dp.des_ivec, ivec);
  86         return(err);
  87 }
  88
  89
  90 /*
  91  * ECB mode encryption
  92  */
  93 int
  94 ecb_crypt(char *key, char *buf, unsigned len, unsigned mode)
  95 {
  96         struct desparams dp;
  97
  98 #ifdef BROKEN_DES
  99         dp.UDES.UDES_buf = buf;
 100         dp.des_mode = CBC;
 101 #else
 102         dp.des_mode = ECB;
 103 #endif
 104         return(common_crypt(key, buf, len, mode, &dp));
 105 }
 106
 107
 108
 109 /*
 110  * Common code to cbc_crypt() & ecb_crypt()
 111  */
 112 static int
 113 common_crypt(char *key, char *buf, unsigned len, unsigned mode,
 114              struct desparams *desp)
 115 {
 116         int desdev;
 117
 118         if ((len % 8) != 0 || len > DES_MAXDATA) {
 119                 return(DESERR_BADPARAM);
 120         }
 121         desp->des_dir =
 122                 ((mode & DES_DIRMASK) == DES_ENCRYPT) ? ENCRYPT : DECRYPT;
 123
 124         desdev = mode & DES_DEVMASK;
 125         COPY8(key, desp->des_key);
 126         /*
 127          * software
 128          */
 129         if (__des_crypt_LOCAL != NULL) {
 130                 if (!__des_crypt_LOCAL(buf, len, desp)) {
 131                         return (DESERR_HWERROR);
 132                 }
 133         } else {
 134                 if (!_des_crypt_call(buf, len, desp)) {
 135                         return (DESERR_HWERROR);
 136                 }
 137         }
 138         return(desdev == DES_SW ? DESERR_NONE : DESERR_NOHWDEVICE);
 139 }