text: /*-
   * Copyright (c) 2009, Sun Microsystems, Inc.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without 
   * modification, are permitted provided that the following conditions are met:
   * - Redistributions of source code must retain the above copyright notice, 
   *   this list of conditions and the following disclaimer.
   * - Redistributions in binary form must reproduce the above copyright notice, 
   *   this list of conditions and the following disclaimer in the documentation 
   *   and/or other materials provided with the distribution.
   * - Neither the name of Sun Microsystems, Inc. nor the names of its 
   *   contributors may be used to endorse or promote products derived 
   *   from this software without specific prior written permission.
   * 
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
   * POSSIBILITY OF SUCH DAMAGE.
   */
  /*
   * des_crypt.c, DES encryption library routines
   * Copyright (C) 1986, Sun Microsystems, Inc.
   */
  
  #include <sys/types.h>
  #include <rpc/des_crypt.h>
  #include <rpc/des.h>
  
  #if defined(LIBC_SCCS) && !defined(lint)
  static char sccsid[] = "@(#)des_crypt.c	2.2 88/08/10 4.0 RPCSRC; from 1.13 88/02/08 SMI";
  #endif
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD: releng/11.0/lib/libc/rpc/des_crypt.c 288113 2015-09-22 15:40:07Z rodrigc $");
  
  static int common_crypt( char *, char *, unsigned, unsigned, struct desparams * );
  int (*__des_crypt_LOCAL)(char *, unsigned, struct desparams *) = 0;
  extern int _des_crypt_call(char *, int, struct desparams *);
  /*
   * Copy 8 bytes
   */
  #define COPY8(src, dst) { \
  	char *a = (char *) dst; \
  	char *b = (char *) src; \
  	*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
  	*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
  }
   
  /*
   * Copy multiple of 8 bytes
   */
  #define DESCOPY(src, dst, len) { \
  	char *a = (char *) dst; \
  	char *b = (char *) src; \
  	int i; \
  	for (i = (int) len; i > 0; i -= 8) { \
  		*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
  		*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
  	} \
  }
  
  /*
   * CBC mode encryption
   */
  int
  cbc_crypt(char *key, char *buf, unsigned len, unsigned mode, char *ivec)
  {
  	int err;
  	struct desparams dp;
  
  #ifdef BROKEN_DES
  	dp.UDES.UDES_buf = buf;
  	dp.des_mode = ECB;
  #else
  	dp.des_mode = CBC;
  #endif
  	COPY8(ivec, dp.des_ivec);
  	err = common_crypt(key, buf, len, mode, &dp);
  	COPY8(dp.des_ivec, ivec);
  	return(err);
  }
  
  
  /*
   * ECB mode encryption
   */
  int
  ecb_crypt(char *key, char *buf, unsigned len, unsigned mode)
  {
  	struct desparams dp;
  
  #ifdef BROKEN_DES
  	dp.UDES.UDES_buf = buf;
  	dp.des_mode = CBC;
  #else
  	dp.des_mode = ECB;
  #endif
  	return(common_crypt(key, buf, len, mode, &dp));
  }
  
  
  
  /*
   * Common code to cbc_crypt() & ecb_crypt()
   */
  static int
  common_crypt(char *key, char *buf, unsigned len, unsigned mode,
      struct desparams *desp)
  {
  	int desdev;
  
  	if ((len % 8) != 0 || len > DES_MAXDATA) {
  		return(DESERR_BADPARAM);
  	}
  	desp->des_dir =
  		((mode & DES_DIRMASK) == DES_ENCRYPT) ? ENCRYPT : DECRYPT;
  
  	desdev = mode & DES_DEVMASK;
  	COPY8(key, desp->des_key);
  	/* 
  	 * software
  	 */
  	if (__des_crypt_LOCAL != NULL) {
  		if (!__des_crypt_LOCAL(buf, len, desp)) {
  			return (DESERR_HWERROR);
  		}
  	} else {
  		if (!_des_crypt_call(buf, len, desp)) {
  			return (DESERR_HWERROR);
  		}
  	}
  	return(desdev == DES_SW ? DESERR_NONE : DESERR_NOHWDEVICE);
  }
  