/*

 * des_crypt.c, DES encryption library routines

 * Copyright (c) 2010, Oracle America, Inc.

 *

 * 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 the "Oracle America, 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.

 */

#include <sys/types.h>

#include <rpc/des_crypt.h>

#include <shlib-compat.h>

#include "des.h"

extern int _des_crypt (char *, unsigned, struct desparams *);

/*

 * Copy 8 bytes

 */

#define COPY8(src, dst) { \

	register char *a = (char *) dst; \

	register 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) { \

	register char *a = (char *) dst; \

	register char *b = (char *) src; \

	register 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++; \

	} \

}

/*

 * Common code to cbc_crypt() & ecb_crypt()

 */

static int

common_crypt (char *key, char *buf, register unsigned len,

	      unsigned mode, register struct desparams *desp)

{

  register 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 (buf, len, desp))

    return DESERR_HWERROR;

  return desdev == DES_SW ? DESERR_NONE : DESERR_NOHWDEVICE;

}

/* Note: these cannot be excluded from the build yet, because they are

   still used internally.  */

/*

 * CBC mode encryption

 */

int

cbc_crypt (char *key, char *buf, unsigned int len, unsigned int mode,

	   char *ivec)

{

  int err;

  struct desparams dp;

  dp.des_mode = CBC;

  COPY8 (ivec, dp.des_ivec);

  err = common_crypt (key, buf, len, mode, &dp;;

  COPY8 (dp.des_ivec, ivec);

  return err;

}

hidden_nolink (cbc_crypt, libc, GLIBC_2_1)

/*

 * ECB mode encryption

 */

int

ecb_crypt (char *key, char *buf, unsigned int len, unsigned int mode)

{

  struct desparams dp;

  dp.des_mode = ECB;

  return common_crypt (key, buf, len, mode, &dp;;

}

hidden_nolink (ecb_crypt, libc, GLIBC_2_1)