/*
  $Id$
*/
/*
 * This version is derived from the original implementation of FreeSec
 * (release 1.1) by David Burren.  I've reviewed the changes made in
 * OpenBSD (as of 2.7) and modified the original code in a similar way
 * where applicable.  I've also made it reentrant and made a number of
 * other changes.
 * - Solar Designer <solar at openwall.com>
 */

/*
 * FreeSec: libcrypt for NetBSD
 *
 * Copyright (c) 1994 David Burren
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the author nor the names of other contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 *
 *  $Owl: Owl/packages/glibc/crypt_freesec.c,v 1.4 2005/11/16 13:08:32 solar Exp $
 *  $Id$
 *
 * This is an original implementation of the DES and the crypt(3) interfaces
 * by David Burren <davidb at werj.com.au>.
 *
 * An excellent reference on the underlying algorithm (and related
 * algorithms) is:
 *
 *  B. Schneier, Applied Cryptography: protocols, algorithms,
 *  and source code in C, John Wiley & Sons, 1994.
 *
 * Note that in that book's description of DES the lookups for the initial,
 * pbox, and final permutations are inverted (this has been brought to the
 * attention of the author).  A list of errata for this book has been
 * posted to the sci.crypt newsgroup by the author and is available for FTP.
 *
 * ARCHITECTURE ASSUMPTIONS:
 *  This code used to have some nasty ones, but these have been removed
 *  by now.  The code requires a 32-bit integer type, though.
 */

#include <sys/types.h>
#include <string.h>

#include "crypt-freesec.h"

static u_char  IP[64] = {
  58, 50, 42, 34, 26, 18, 10,  2, 60, 52, 44, 36, 28, 20, 12,  4,
  62, 54, 46, 38, 30, 22, 14,  6, 64, 56, 48, 40, 32, 24, 16,  8,
  57, 49, 41, 33, 25, 17,  9,  1, 59, 51, 43, 35, 27, 19, 11,  3,
  61, 53, 45, 37, 29, 21, 13,  5, 63, 55, 47, 39, 31, 23, 15,  7
};

static u_char  key_perm[56] = {
  57, 49, 41, 33, 25, 17,  9,  1, 58, 50, 42, 34, 26, 18,
  10,  2, 59, 51, 43, 35, 27, 19, 11,  3, 60, 52, 44, 36,
  63, 55, 47, 39, 31, 23, 15,  7, 62, 54, 46, 38, 30, 22,
  14,  6, 61, 53, 45, 37, 29, 21, 13,  5, 28, 20, 12,  4
};

static u_char  key_shifts[16] = {
  1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
};

static u_char  comp_perm[48] = {
  14, 17, 11, 24,  1,  5,  3, 28, 15,  6, 21, 10,
  23, 19, 12,  4, 26,  8, 16,  7, 27, 20, 13,  2,
  41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48,
  44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32
};

/*
 *  No E box is used, as it's replaced by some ANDs, shifts, and ORs.
 */

static u_char  sbox[8][64] = {
  {
    14,  4, 13,  1,  2, 15, 11,  8,  3, 10,  6, 12,  5,  9,  0,  7,
     0, 15,  7,  4, 14,  2, 13,  1, 10,  6, 12, 11,  9,  5,  3,  8,
     4,  1, 14,  8, 13,  6,  2, 11, 15, 12,  9,  7,  3, 10,  5,  0,
    15, 12,  8,  2,  4,  9,  1,  7,  5, 11,  3, 14, 10,  0,  6, 13
  },
  {
    15,  1,  8, 14,  6, 11,  3,  4,  9,  7,  2, 13, 12,  0,  5, 10,
     3, 13,  4,  7, 15,  2,  8, 14, 12,  0,  1, 10,  6,  9, 11,  5,
     0, 14,  7, 11, 10,  4, 13,  1,  5,  8, 12,  6,  9,  3,  2, 15,
    13,  8, 10,  1,  3, 15,  4,  2, 11,  6,  7, 12,  0,  5, 14,  9
  },
  {
    10,  0,  9, 14,  6,  3, 15,  5,  1, 13, 12,  7, 11,  4,  2,  8,
    13,  7,  0,  9,  3,  4,  6, 10,  2,  8,  5, 14, 12, 11, 15,  1,
    13,  6,  4,  9,  8, 15,  3,  0, 11,  1,  2, 12,  5, 10, 14,  7,
     1, 10, 13,  0,  6,  9,  8,  7,  4, 15, 14,  3, 11,  5,  2, 12
  },
  {
     7, 13, 14,  3,  0,  6,  9, 10,  1,  2,  8,  5, 11, 12,  4, 15,
    13,  8, 11,  5,  6, 15,  0,  3,  4,  7,  2, 12,  1, 10, 14,  9,
    10,  6,  9,  0, 12, 11,  7, 13, 15,  1,  3, 14,  5,  2,  8,  4,
     3, 15,  0,  6, 10,  1, 13,  8,  9,  4,  5, 11, 12,  7,  2, 14
  },
  {
     2, 12,  4,  1,  7, 10, 11,  6,  8,  5,  3, 15, 13,  0, 14,  9,
    14, 11,  2, 12,  4,  7, 13,  1,  5,  0, 15, 10,  3,  9,  8,  6,
     4,  2,  1, 11, 10, 13,  7,  8, 15,  9, 12,  5,  6,  3,  0, 14,
    11,  8, 12,  7,  1, 14,  2, 13,  6, 15,  0,  9, 10,  4,  5,  3
  },
  {
    12,  1, 10, 15,  9,  2,  6,  8,  0, 13,  3,  4, 14,  7,  5, 11,
    10, 15,  4,  2,  7, 12,  9,  5,  6,  1, 13, 14,  0, 11,  3,  8,
     9, 14, 15,  5,  2,  8, 12,  3,  7,  0,  4, 10,  1, 13, 11,  6,
     4,  3,  2, 12,  9,  5, 15, 10, 11, 14,  1,  7,  6,  0,  8, 13
  },
  {
     4, 11,  2, 14, 15,  0,  8, 13,  3, 12,  9,  7,  5, 10,  6,  1,
    13,  0, 11,  7,  4,  9,  1, 10, 14,  3,  5, 12,  2, 15,  8,  6,
     1,  4, 11, 13, 12,  3,  7, 14, 10, 15,  6,  8,  0,  5,  9,  2,
     6, 11, 13,  8,  1,  4, 10,  7,  9,  5,  0, 15, 14,  2,  3, 12
  },
  {
    13,  2,  8,  4,  6, 15, 11,  1, 10,  9,  3, 14,  5,  0, 12,  7,
     1, 15, 13,  8, 10,  3,  7,  4, 12,  5,  6, 11,  0, 14,  9,  2,
     7, 11,  4,  1,  9, 12, 14,  2,  0,  6, 10, 13, 15,  3,  5,  8,
     2,  1, 14,  7,  4, 10,  8, 13, 15, 12,  9,  0,  3,  5,  6, 11
  }
};

static u_char  pbox[32] = {
  16,  7, 20, 21, 29, 12, 28, 17,  1, 15, 23, 26,  5, 18, 31, 10,
   2,  8, 24, 14, 32, 27,  3,  9, 19, 13, 30,  6, 22, 11,  4, 25
};

static uint32_t bits32[32] =
{
  0x80000000, 0x40000000, 0x20000000, 0x10000000,
  0x08000000, 0x04000000, 0x02000000, 0x01000000,
  0x00800000, 0x00400000, 0x00200000, 0x00100000,
  0x00080000, 0x00040000, 0x00020000, 0x00010000,
  0x00008000, 0x00004000, 0x00002000, 0x00001000,
  0x00000800, 0x00000400, 0x00000200, 0x00000100,
  0x00000080, 0x00000040, 0x00000020, 0x00000010,
  0x00000008, 0x00000004, 0x00000002, 0x00000001
};

static u_char  bits8[8] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 };

static unsigned char  ascii64[] =
   "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
/*    0000000000111111111122222222223333333333444444444455555555556666 */
/*    0123456789012345678901234567890123456789012345678901234567890123 */

static u_char m_sbox[4][4096];
static uint32_t psbox[4][256];
static uint32_t ip_maskl[8][256], ip_maskr[8][256];
static uint32_t fp_maskl[8][256], fp_maskr[8][256];
static uint32_t key_perm_maskl[8][128], key_perm_maskr[8][128];
static uint32_t comp_maskl[8][128], comp_maskr[8][128];

static inline int
ascii_to_bin(char ch)
{
  signed char sch = ch;
  int retval;

  retval = sch - '.';
  if (sch >= 'A') {
    retval = sch - ('A' - 12);
    if (sch >= 'a')
      retval = sch - ('a' - 38);
  }
  retval &= 0x3f;

  return(retval);
}

/*
 * When we choose to "support" invalid salts, nevertheless disallow those
 * containing characters that would violate the passwd file format.
 */
static inline int
ascii_is_unsafe(char ch)
{
  return !ch || ch == '\n' || ch == ':';
}

void
_crypt_extended_init(void)
{
  int i, j, b, k, inbit, obit;
  uint32_t *p, *il, *ir, *fl, *fr;
  uint32_t *bits28, *bits24;
  u_char inv_key_perm[64];
  u_char u_key_perm[56];
  u_char inv_comp_perm[56];
  u_char init_perm[64], final_perm[64];
  u_char u_sbox[8][64];
  u_char un_pbox[32];

  bits24 = (bits28 = bits32 + 4) + 4;

  /*
   * Invert the S-boxes, reordering the input bits.
   */
  for (i = 0; i < 8; i++)
    for (j = 0; j < 64; j++) {
      b = (j & 0x20) | ((j & 1) << 4) | ((j >> 1) & 0xf);
      u_sbox[i][j] = sbox[i][b];
    }

  /*
   * Convert the inverted S-boxes into 4 arrays of 8 bits.
   * Each will handle 12 bits of the S-box input.
   */
  for (b = 0; b < 4; b++)
    for (i = 0; i < 64; i++)
      for (j = 0; j < 64; j++)
        m_sbox[b][(i << 6) | j] =
          (u_sbox[(b << 1)][i] << 4) |
          u_sbox[(b << 1) + 1][j];

  /*
   * Set up the initial & final permutations into a useful form, and
   * initialise the inverted key permutation.
   */
  for (i = 0; i < 64; i++) {
    init_perm[final_perm[i] = IP[i] - 1] = i;
    inv_key_perm[i] = 255;
  }

  /*
   * Invert the key permutation and initialise the inverted key
   * compression permutation.
   */
  for (i = 0; i < 56; i++) {
    u_key_perm[i] = key_perm[i] - 1;
    inv_key_perm[key_perm[i] - 1] = i;
    inv_comp_perm[i] = 255;
  }

  /*
   * Invert the key compression permutation.
   */
  for (i = 0; i < 48; i++) {
    inv_comp_perm[comp_perm[i] - 1] = i;
  }

  /*
   * Set up the OR-mask arrays for the initial and final permutations,
   * and for the key initial and compression permutations.
   */
  for (k = 0; k < 8; k++) {
    for (i = 0; i < 256; i++) {
      *(il = &ip_maskl[k][i]) = 0;
      *(ir = &ip_maskr[k][i]) = 0;
      *(fl = &fp_maskl[k][i]) = 0;
      *(fr = &fp_maskr[k][i]) = 0;
      for (j = 0; j < 8; j++) {
        inbit = 8 * k + j;
        if (i & bits8[j]) {
          if ((obit = init_perm[inbit]) < 32)
            *il |= bits32[obit];
          else
            *ir |= bits32[obit-32];
          if ((obit = final_perm[inbit]) < 32)
            *fl |= bits32[obit];
          else
            *fr |= bits32[obit - 32];
        }
      }
    }
    for (i = 0; i < 128; i++) {
      *(il = &key_perm_maskl[k][i]) = 0;
      *(ir = &key_perm_maskr[k][i]) = 0;
      for (j = 0; j < 7; j++) {
        inbit = 8 * k + j;
        if (i & bits8[j + 1]) {
          if ((obit = inv_key_perm[inbit]) == 255)
            continue;
          if (obit < 28)
            *il |= bits28[obit];
          else
            *ir |= bits28[obit - 28];
        }
      }
      *(il = &comp_maskl[k][i]) = 0;
      *(ir = &comp_maskr[k][i]) = 0;
      for (j = 0; j < 7; j++) {
        inbit = 7 * k + j;
        if (i & bits8[j + 1]) {
          if ((obit=inv_comp_perm[inbit]) == 255)
            continue;
          if (obit < 24)
            *il |= bits24[obit];
          else
            *ir |= bits24[obit - 24];
        }
      }
    }
  }

  /*
   * Invert the P-box permutation, and convert into OR-masks for
   * handling the output of the S-box arrays setup above.
   */
  for (i = 0; i < 32; i++)
    un_pbox[pbox[i] - 1] = i;

  for (b = 0; b < 4; b++)
    for (i = 0; i < 256; i++) {
      *(p = &psbox[b][i]) = 0;
      for (j = 0; j < 8; j++) {
        if (i & bits8[j])
          *p |= bits32[un_pbox[8 * b + j]];
      }
    }
}

static void
des_init_local(struct php_crypt_extended_data *data)
{
  data->old_rawkey0 = data->old_rawkey1 = 0;
  data->saltbits = 0;
  data->old_salt = 0;

  data->initialized = 1;
}

static void
setup_salt(uint32_t salt, struct php_crypt_extended_data *data)
{
  uint32_t  obit, saltbit, saltbits;
  int  i;

  if (salt == data->old_salt)
    return;
  data->old_salt = salt;

  saltbits = 0;
  saltbit = 1;
  obit = 0x800000;
  for (i = 0; i < 24; i++) {
    if (salt & saltbit)
      saltbits |= obit;
    saltbit <<= 1;
    obit >>= 1;
  }
  data->saltbits = saltbits;
}

static int
des_setkey(const char *key, struct php_crypt_extended_data *data)
{
  uint32_t  k0, k1, rawkey0, rawkey1;
  int  shifts, round;

  rawkey0 =
    (uint32_t)(u_char)key[3] |
    ((uint32_t)(u_char)key[2] << 8) |
    ((uint32_t)(u_char)key[1] << 16) |
    ((uint32_t)(u_char)key[0] << 24);
  rawkey1 =
    (uint32_t)(u_char)key[7] |
    ((uint32_t)(u_char)key[6] << 8) |
    ((uint32_t)(u_char)key[5] << 16) |
    ((uint32_t)(u_char)key[4] << 24);

  if ((rawkey0 | rawkey1)
      && rawkey0 == data->old_rawkey0
      && rawkey1 == data->old_rawkey1) {
    /*
     * Already setup for this key.
     * This optimisation fails on a zero key (which is weak and
     * has bad parity anyway) in order to simplify the starting
     * conditions.
     */
    return(0);
  }
  data->old_rawkey0 = rawkey0;
  data->old_rawkey1 = rawkey1;

  /*
   *  Do key permutation and split into two 28-bit subkeys.
   */
  k0 = key_perm_maskl[0][rawkey0 >> 25]
     | key_perm_maskl[1][(rawkey0 >> 17) & 0x7f]
     | key_perm_maskl[2][(rawkey0 >> 9) & 0x7f]
     | key_perm_maskl[3][(rawkey0 >> 1) & 0x7f]
     | key_perm_maskl[4][rawkey1 >> 25]
     | key_perm_maskl[5][(rawkey1 >> 17) & 0x7f]
     | key_perm_maskl[6][(rawkey1 >> 9) & 0x7f]
     | key_perm_maskl[7][(rawkey1 >> 1) & 0x7f];
  k1 = key_perm_maskr[0][rawkey0 >> 25]
     | key_perm_maskr[1][(rawkey0 >> 17) & 0x7f]
     | key_perm_maskr[2][(rawkey0 >> 9) & 0x7f]
     | key_perm_maskr[3][(rawkey0 >> 1) & 0x7f]
     | key_perm_maskr[4][rawkey1 >> 25]
     | key_perm_maskr[5][(rawkey1 >> 17) & 0x7f]
     | key_perm_maskr[6][(rawkey1 >> 9) & 0x7f]
     | key_perm_maskr[7][(rawkey1 >> 1) & 0x7f];
  /*
   *  Rotate subkeys and do compression permutation.
   */
  shifts = 0;
  for (round = 0; round < 16; round++) {
    uint32_t  t0, t1;

    shifts += key_shifts[round];

    t0 = (k0 << shifts) | (k0 >> (28 - shifts));
    t1 = (k1 << shifts) | (k1 >> (28 - shifts));

    data->de_keysl[15 - round] =
    data->en_keysl[round] = comp_maskl[0][(t0 >> 21) & 0x7f]
        | comp_maskl[1][(t0 >> 14) & 0x7f]
        | comp_maskl[2][(t0 >> 7) & 0x7f]
        | comp_maskl[3][t0 & 0x7f]
        | comp_maskl[4][(t1 >> 21) & 0x7f]
        | comp_maskl[5][(t1 >> 14) & 0x7f]
        | comp_maskl[6][(t1 >> 7) & 0x7f]
        | comp_maskl[7][t1 & 0x7f];

    data->de_keysr[15 - round] =
    data->en_keysr[round] = comp_maskr[0][(t0 >> 21) & 0x7f]
        | comp_maskr[1][(t0 >> 14) & 0x7f]
        | comp_maskr[2][(t0 >> 7) & 0x7f]
        | comp_maskr[3][t0 & 0x7f]
        | comp_maskr[4][(t1 >> 21) & 0x7f]
        | comp_maskr[5][(t1 >> 14) & 0x7f]
        | comp_maskr[6][(t1 >> 7) & 0x7f]
        | comp_maskr[7][t1 & 0x7f];
  }
  return(0);
}

static int
do_des(uint32_t l_in, uint32_t r_in, uint32_t *l_out, uint32_t *r_out,
  int count, struct php_crypt_extended_data *data)
{
  /*
   *  l_in, r_in, l_out, and r_out are in pseudo-"big-endian" format.
   */
  uint32_t  l, r, *kl, *kr, *kl1, *kr1;
  uint32_t  f, r48l, r48r, saltbits;
  int  round;

  if (count == 0) {
    return(1);
  } else if (count > 0) {
    /*
     * Encrypting
     */
    kl1 = data->en_keysl;
    kr1 = data->en_keysr;
  } else {
    /*
     * Decrypting
     */
    count = -count;
    kl1 = data->de_keysl;
    kr1 = data->de_keysr;
  }

  /*
   *  Do initial permutation (IP).
   */
  l = ip_maskl[0][l_in >> 24]
    | ip_maskl[1][(l_in >> 16) & 0xff]
    | ip_maskl[2][(l_in >> 8) & 0xff]
    | ip_maskl[3][l_in & 0xff]
    | ip_maskl[4][r_in >> 24]
    | ip_maskl[5][(r_in >> 16) & 0xff]
    | ip_maskl[6][(r_in >> 8) & 0xff]
    | ip_maskl[7][r_in & 0xff];
  r = ip_maskr[0][l_in >> 24]
    | ip_maskr[1][(l_in >> 16) & 0xff]
    | ip_maskr[2][(l_in >> 8) & 0xff]
    | ip_maskr[3][l_in & 0xff]
    | ip_maskr[4][r_in >> 24]
    | ip_maskr[5][(r_in >> 16) & 0xff]
    | ip_maskr[6][(r_in >> 8) & 0xff]
    | ip_maskr[7][r_in & 0xff];

  saltbits = data->saltbits;
  while (count--) {
    /*
     * Do each round.
     */
    kl = kl1;
    kr = kr1;
    round = 16;
    while (round--) {
      /*
       * Expand R to 48 bits (simulate the E-box).
       */
      r48l  = ((r & 0x00000001) << 23)
        | ((r & 0xf8000000) >> 9)
        | ((r & 0x1f800000) >> 11)
        | ((r & 0x01f80000) >> 13)
        | ((r & 0x001f8000) >> 15);

      r48r  = ((r & 0x0001f800) << 7)
        | ((r & 0x00001f80) << 5)
        | ((r & 0x000001f8) << 3)
        | ((r & 0x0000001f) << 1)
        | ((r & 0x80000000) >> 31);
      /*
       * Do salting for crypt() and friends, and
       * XOR with the permuted key.
       */
      f = (r48l ^ r48r) & saltbits;
      r48l ^= f ^ *kl++;
      r48r ^= f ^ *kr++;
      /*
       * Do sbox lookups (which shrink it back to 32 bits)
       * and do the pbox permutation at the same time.
       */
      f = psbox[0][m_sbox[0][r48l >> 12]]
        | psbox[1][m_sbox[1][r48l & 0xfff]]
        | psbox[2][m_sbox[2][r48r >> 12]]
        | psbox[3][m_sbox[3][r48r & 0xfff]];
      /*
       * Now that we've permuted things, complete f().
       */
      f ^= l;
      l = r;
      r = f;
    }
    r = l;
    l = f;
  }
  /*
   * Do final permutation (inverse of IP).
   */
  *l_out  = fp_maskl[0][l >> 24]
    | fp_maskl[1][(l >> 16) & 0xff]
    | fp_maskl[2][(l >> 8) & 0xff]
    | fp_maskl[3][l & 0xff]
    | fp_maskl[4][r >> 24]
    | fp_maskl[5][(r >> 16) & 0xff]
    | fp_maskl[6][(r >> 8) & 0xff]
    | fp_maskl[7][r & 0xff];
  *r_out  = fp_maskr[0][l >> 24]
    | fp_maskr[1][(l >> 16) & 0xff]
    | fp_maskr[2][(l >> 8) & 0xff]
    | fp_maskr[3][l & 0xff]
    | fp_maskr[4][r >> 24]
    | fp_maskr[5][(r >> 16) & 0xff]
    | fp_maskr[6][(r >> 8) & 0xff]
    | fp_maskr[7][r & 0xff];
  return(0);
}

static int
des_cipher(const char *in, char *out, uint32_t salt, int count,
  struct php_crypt_extended_data *data)
{
  uint32_t  l_out, r_out, rawl, rawr;
  int  retval;

  setup_salt(salt, data);

  rawl =
    (uint32_t)(u_char)in[3] |
    ((uint32_t)(u_char)in[2] << 8) |
    ((uint32_t)(u_char)in[1] << 16) |
    ((uint32_t)(u_char)in[0] << 24);
  rawr =
    (uint32_t)(u_char)in[7] |
    ((uint32_t)(u_char)in[6] << 8) |
    ((uint32_t)(u_char)in[5] << 16) |
    ((uint32_t)(u_char)in[4] << 24);

  retval = do_des(rawl, rawr, &l_out, &r_out, count, data);

  out[0] = l_out >> 24;
  out[1] = l_out >> 16;
  out[2] = l_out >> 8;
  out[3] = l_out;
  out[4] = r_out >> 24;
  out[5] = r_out >> 16;
  out[6] = r_out >> 8;
  out[7] = r_out;

  return(retval);
}

char *
_crypt_extended_r(const char *key, const char *setting,
  struct php_crypt_extended_data *data)
{
  int    i;
  uint32_t  count, salt, l, r0, r1, keybuf[2];
  u_char    *p, *q;

  if (!data->initialized)
    des_init_local(data);

  /*
   * Copy the key, shifting each character up by one bit
   * and padding with zeros.
   */
  q = (u_char *) keybuf;
  while (q - (u_char *) keybuf < sizeof(keybuf)) {
    *q++ = *key << 1;
    if (*key)
      key++;
  }
  if (des_setkey((u_char *) keybuf, data))
    return(NULL);

  if (*setting == '_') {
    /*
     * "new"-style:
     *  setting - underscore, 4 chars of count, 4 chars of salt
     *  key - unlimited characters
     */
    for (i = 1, count = 0; i < 5; i++) {
      int value = ascii_to_bin(setting[i]);
      if (ascii64[value] != setting[i])
        return(NULL);
      count |= value << (i - 1) * 6;
    }
    if (!count)
      return(NULL);

    for (i = 5, salt = 0; i < 9; i++) {
      int value = ascii_to_bin(setting[i]);
      if (ascii64[value] != setting[i])
        return(NULL);
      salt |= value << (i - 5) * 6;
    }

    while (*key) {
      /*
       * Encrypt the key with itself.
       */
      if (des_cipher((u_char *) keybuf, (u_char *) keybuf,
          0, 1, data))
        return(NULL);
      /*
       * And XOR with the next 8 characters of the key.
       */
      q = (u_char *) keybuf;
      while (q - (u_char *) keybuf < sizeof(keybuf) && *key)
        *q++ ^= *key++ << 1;

      if (des_setkey((u_char *) keybuf, data))
        return(NULL);
    }
    memcpy(data->output, setting, 9);
    data->output[9] = '\0';
    p = (u_char *) data->output + 9;
  } else {
    /*
     * "old"-style:
     *  setting - 2 chars of salt
     *  key - up to 8 characters
     */
    count = 25;

    if (ascii_is_unsafe(setting[0]) || ascii_is_unsafe(setting[1]))
      return(NULL);

    salt = (ascii_to_bin(setting[1]) << 6)
         |  ascii_to_bin(setting[0]);

    data->output[0] = setting[0];
    data->output[1] = setting[1];
    p = (u_char *) data->output + 2;
  }
  setup_salt(salt, data);
  /*
   * Do it.
   */
  if (do_des(0, 0, &r0, &r1, count, data))
    return(NULL);
  /*
   * Now encode the result...
   */
  l = (r0 >> 8);
  *p++ = ascii64[(l >> 18) & 0x3f];
  *p++ = ascii64[(l >> 12) & 0x3f];
  *p++ = ascii64[(l >> 6) & 0x3f];
  *p++ = ascii64[l & 0x3f];

  l = (r0 << 16) | ((r1 >> 16) & 0xffff);
  *p++ = ascii64[(l >> 18) & 0x3f];
  *p++ = ascii64[(l >> 12) & 0x3f];
  *p++ = ascii64[(l >> 6) & 0x3f];
  *p++ = ascii64[l & 0x3f];

  l = r1 << 2;
  *p++ = ascii64[(l >> 12) & 0x3f];
  *p++ = ascii64[(l >> 6) & 0x3f];
  *p++ = ascii64[l & 0x3f];
  *p = 0;

  return(data->output);
}
