/*

 * 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.

 */

#if 0

#ident	"@(#)xcrypt.c	1.11	94/08/23 SMI"

#endif

#if !defined(lint) && defined(SCCSIDS)

static char sccsid[] = "@(#)xcrypt.c 1.3 89/03/24 Copyr 1986 Sun Micro";

#endif

/*

 * xcrypt.c: Hex encryption/decryption and utility routines

 */

#include <ctype.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/types.h>

#include <rpc/des_crypt.h>

#include <shlib-compat.h>

static const char hex[16] =

{

  '0', '1', '2', '3', '4', '5', '6', '7',

  '8', '9', 'a', 'b', 'c', 'd', 'e', 'f',

};

#ifdef _LIBC

# define hexval(c) \

  (c >= '0' && c <= '9'							      \

   ? c - '0'								      \

   : ({	int upp = toupper (c);						      \

	upp >= 'A' && upp <= 'Z' ? upp - 'A' + 10 : -1; }))

#else

static char hexval (char);

#endif

static void hex2bin (int, char *, char *);

static void bin2hex (int, unsigned char *, char *);

void passwd2des_internal (char *pw, char *key);

#ifdef _LIBC

libc_hidden_proto (passwd2des_internal)

#endif

/*

 * Turn password into DES key

 */

void

passwd2des_internal (char *pw, char *key)

{

  int i;

  memset (key, 0, 8);

  for (i = 0; *pw && i < 8; ++i)

    key[i] ^= *pw++ << 1;

  des_setparity (key);

}

#ifdef _LIBC

libc_hidden_def (passwd2des_internal)

libc_sunrpc_symbol(passwd2des_internal, passwd2des, GLIBC_2_1)

#else

void passwd2des (char *pw, char *key)

{

  return passwd2des_internal (pw, key);

}

#endif

/*

 * Encrypt a secret key given passwd

 * The secret key is passed and returned in hex notation.

 * Its length must be a multiple of 16 hex digits (64 bits).

 */

int

xencrypt (char *secret, char *passwd)

{

  char key[8];

  char ivec[8];

  char *buf;

  int err;

  int len;

  len = strlen (secret) / 2;

  buf = malloc ((unsigned) len);

  hex2bin (len, secret, buf);

  passwd2des_internal (passwd, key);

  memset (ivec, 0, 8);

  err = cbc_crypt (key, buf, len, DES_ENCRYPT | DES_HW, ivec);

  if (DES_FAILED (err))

    {

      free (buf);

      return 0;

    }

  bin2hex (len, (unsigned char *) buf, secret);

  free (buf);

  return 1;

}

libc_hidden_nolink_sunrpc (xencrypt, GLIBC_2_0)

/*

 * Decrypt secret key using passwd

 * The secret key is passed and returned in hex notation.

 * Once again, the length is a multiple of 16 hex digits

 */

int

xdecrypt (char *secret, char *passwd)

{

  char key[8];

  char ivec[8];

  char *buf;

  int err;

  int len;

  len = strlen (secret) / 2;

  buf = malloc ((unsigned) len);

  hex2bin (len, secret, buf);

  passwd2des_internal (passwd, key);

  memset (ivec, 0, 8);

  err = cbc_crypt (key, buf, len, DES_DECRYPT | DES_HW, ivec);

  if (DES_FAILED (err))

    {

      free (buf);

      return 0;

    }

  bin2hex (len, (unsigned char *) buf, secret);

  free (buf);

  return 1;

}

#ifdef EXPORT_RPC_SYMBOLS

libc_hidden_def (xdecrypt)

#else

libc_hidden_nolink_sunrpc (xdecrypt, GLIBC_2_1)

#endif

/*

 * Hex to binary conversion

 */

static void

hex2bin (int len, char *hexnum, char *binnum)

{

  int i;

  for (i = 0; i < len; i++)

    *binnum++ = 16 * hexval (hexnum[2 * i]) + hexval (hexnum[2 * i + 1]);

}

/*

 * Binary to hex conversion

 */

static void

bin2hex (int len, unsigned char *binnum, char *hexnum)

{

  int i;

  unsigned val;

  for (i = 0; i < len; i++)

    {

      val = binnum[i];

      hexnum[i * 2] = hex[val >> 4];

      hexnum[i * 2 + 1] = hex[val & 0xf];

    }

  hexnum[len * 2] = 0;

}

#ifndef _LIBC

static char

hexval (char c)

{

  if (c >= '0' && c <= '9')

    return (c - '0');

  else if (c >= 'a' && c <= 'z')

    return (c - 'a' + 10);

  else if (c >= 'A' && c <= 'Z')

    return (c - 'A' + 10);

  else

    return -1;

}

#endif