lib/libc/rpc/des_crypt.c

   1 /*-
   2  * Copyright (c) 2009, Sun Microsystems, Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  * - Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  * - Redistributions in binary form must reproduce the above copyright notice,
  10  *   this list of conditions and the following disclaimer in the documentation
  11  *   and/or other materials provided with the distribution.
  12  * - Neither the name of Sun Microsystems, Inc. nor the names of its
  13  *   contributors may be used to endorse or promote products derived
  14  *   from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * @(#)des_crypt.c      2.2 88/08/10 4.0 RPCSRC; from 1.13 88/02/08 SMI
  29  * $FreeBSD: src/lib/libc/rpc/des_crypt.c,v 1.3 1999/08/28 00:00:38 peter Exp $
  30  */
  31 /*
  32  * des_crypt.c, DES encryption library routines
  33  * Copyright (C) 1986, Sun Microsystems, Inc.
  34  */
  35
  36 #include <sys/types.h>
  37 #include <rpc/des_crypt.h>
  38 #include <rpc/des.h>
  39
  40 static int common_crypt ( char *, char *, unsigned, unsigned, struct desparams * );
  41 int (*__des_crypt_LOCAL)() = NULL;
  42 extern int _des_crypt_call( char *, int, struct desparams * );
  43 /*
  44  * Copy 8 bytes
  45  */
  46 #define COPY8(src, dst) { \
  47         char *a = (char *) dst; \
  48         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         char *a = (char *) dst; \
  58         char *b = (char *) src; \
  59         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  * CBC mode encryption
  68  */
  69 int
  70 cbc_crypt(char *key, char *buf, unsigned len, unsigned mode, char *ivec)
  71 {
  72         int err;
  73         struct desparams dp;
  74
  75 #ifdef BROKEN_DES
  76         dp.UDES.UDES_buf = buf;
  77         dp.des_mode = ECB;
  78 #else
  79         dp.des_mode = CBC;
  80 #endif
  81         COPY8(ivec, dp.des_ivec);
  82         err = common_crypt(key, buf, len, mode, &dp);
  83         COPY8(dp.des_ivec, ivec);
  84         return(err);
  85 }
  86
  87
  88 /*
  89  * ECB mode encryption
  90  */
  91 int
  92 ecb_crypt(char *key, char *buf, unsigned len, unsigned mode)
  93 {
  94         struct desparams dp;
  95
  96 #ifdef BROKEN_DES
  97         dp.UDES.UDES_buf = buf;
  98         dp.des_mode = CBC;
  99 #else
 100         dp.des_mode = ECB;
 101 #endif
 102         return(common_crypt(key, buf, len, mode, &dp));
 103 }
 104
 105
 106
 107 /*
 108  * Common code to cbc_crypt() & ecb_crypt()
 109  */
 110 static int
 111 common_crypt(char *key, char *buf, unsigned len, unsigned mode,
 112              struct desparams *desp)
 113 {
 114         int desdev;
 115
 116         if ((len % 8) != 0 || len > DES_MAXDATA) {
 117                 return(DESERR_BADPARAM);
 118         }
 119         desp->des_dir =
 120                 ((mode & DES_DIRMASK) == DES_ENCRYPT) ? ENCRYPT : DECRYPT;
 121
 122         desdev = mode & DES_DEVMASK;
 123         COPY8(key, desp->des_key);
 124         /*
 125          * software
 126          */
 127         if (__des_crypt_LOCAL != NULL) {
 128                 if (!__des_crypt_LOCAL(buf, len, desp)) {
 129                         return (DESERR_HWERROR);
 130                 }
 131         } else {
 132                 if (!_des_crypt_call(buf, len, desp)) {
 133                         return (DESERR_HWERROR);
 134                 }
 135         }
 136         return(desdev == DES_SW ? DESERR_NONE : DESERR_NOHWDEVICE);
 137 }