text: /*
    $Id$
  */
  /*
   * 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>
  
  #ifdef TEST
  #include <stdio.h>
  #endif
  
  #include "crypt_freesec.h"
  
  #define _PASSWORD_EFMT1 '_'
  
  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 == _PASSWORD_EFMT1) {
  		/*
  		 * "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);
  }
  
  #ifdef TEST
  static char *
  _crypt_extended(const char *key, const char *setting)
  {
  	static int initialized = 0;
  	static struct php_crypt_extended_data data;
  
  	if (!initialized) {
  		_crypt_extended_init();
  		initialized = 1;
  		data.initialized = 0;
  	}
  	return _crypt_extended_r(key, setting, &data);
  }
  
  #define crypt _crypt_extended
  
  static struct {
  	char *hash;
  	char *pw;
  } tests[] = {
  /* "new"-style */
  	{"_J9..CCCCXBrJUJV154M", "U*U*U*U*"},
  	{"_J9..CCCCXUhOBTXzaiE", "U*U***U"},
  	{"_J9..CCCC4gQ.mB/PffM", "U*U***U*"},
  	{"_J9..XXXXvlzQGqpPPdk", "*U*U*U*U"},
  	{"_J9..XXXXsqM/YSSP..Y", "*U*U*U*U*"},
  	{"_J9..XXXXVL7qJCnku0I", "*U*U*U*U*U*U*U*U"},
  	{"_J9..XXXXAj8cFbP5scI", "*U*U*U*U*U*U*U*U*"},
  	{"_J9..SDizh.vll5VED9g", "ab1234567"},
  	{"_J9..SDizRjWQ/zePPHc", "cr1234567"},
  	{"_J9..SDizxmRI1GjnQuE", "zxyDPWgydbQjgq"},
  	{"_K9..SaltNrQgIYUAeoY", "726 even"},
  	{"_J9..SDSD5YGyRCr4W4c", ""},
  /* "old"-style, valid salts */
  	{"CCNf8Sbh3HDfQ", "U*U*U*U*"},
  	{"CCX.K.MFy4Ois", "U*U***U"},
  	{"CC4rMpbg9AMZ.", "U*U***U*"},
  	{"XXxzOu6maQKqQ", "*U*U*U*U"},
  	{"SDbsugeBiC58A", ""},
  	{"./xZjzHv5vzVE", "password"},
  	{"0A2hXM1rXbYgo", "password"},
  	{"A9RXdR23Y.cY6", "password"},
  	{"ZziFATVXHo2.6", "password"},
  	{"zZDDIZ0NOlPzw", "password"},
  /* "old"-style, "reasonable" invalid salts, UFC-crypt behavior expected */
  	{"\001\002wyd0KZo65Jo", "password"},
  	{"a_C10Dk/ExaG.", "password"},
  	{"~\377.5OTsRVjwLo", "password"},
  /* The below are erroneous inputs, so NULL return is expected/required */
  	{"", ""}, /* no salt */
  	{" ", ""}, /* setting string is too short */
  	{"a:", ""}, /* unsafe character */
  	{"\na", ""}, /* unsafe character */
  	{"_/......", ""}, /* setting string is too short for its type */
  	{"_........", ""}, /* zero iteration count */
  	{"_/!......", ""}, /* invalid character in count */
  	{"_/......!", ""}, /* invalid character in salt */
  	{NULL}
  };
  
  int main(void)
  {
  	int i;
  
  	for (i = 0; tests[i].hash; i++) {
  		char *hash = crypt(tests[i].pw, tests[i].hash);
  		if (!hash && strlen(tests[i].hash) < 13)
  			continue; /* expected failure */
  		if (!strcmp(hash, tests[i].hash))
  			continue; /* expected success */
  		puts("FAILED");
  		return 1;
  	}
  
  	puts("PASSED");
  
  	return 0;
  }
  #endif
  