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annotate urogue/xcrypt.c @ 298:5a94c9b3181e

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UltraRogue: clear the next_obj field when removing items from the floor. The next_obj field is a pointer which the top item in a stack uses to keep a list of the other items. When removing an item from the stack, rem_obj() failed to set next_obj to NULL, which can cause items in monster inventory to point to items earlier in the inventory list. That causes infinite co-recursion when saving or restoring.
author John "Elwin" Edwards
date Thu, 08 Feb 2018 20:54:34 -0500
parents c495a4f288c6
children e52a8a7ad4c5
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1 /*
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2 * FreeSec: libcrypt
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3 *
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4 * Copyright (C) 1994 David Burren
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5 * All rights reserved.
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6 *
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7 * Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following conditions
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9 * are met:
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10 * 1. Redistributions of source code must retain the above copyright
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11 * notice, this list of conditions and the following disclaimer.
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 * 3. Neither the name(s) of the author(s) nor the names of other contributors
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16 * may be used to endorse or promote products derived from this software
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17 * without specific prior written permission.
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18 *
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19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) AND CONTRIBUTORS ``AS IS'' AND
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20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) OR CONTRIBUTORS BE LIABLE
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23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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29 * SUCH DAMAGE.
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30 *
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31 *
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32 * This is an original implementation of the DES and the crypt(3) interfaces
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33 * by David Burren <davidb@werj.com.au>.
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34 *
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35 * An excellent reference on the underlying algorithm (and related
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36 * algorithms) is:
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37 *
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38 * B. Schneier, Applied Cryptography: protocols, algorithms,
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39 * and source code in C, John Wiley & Sons, 1994.
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40 *
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41 * Note that in that book's description of DES the lookups for the initial,
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42 * pbox, and final permutations are inverted (this has been brought to the
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43 * attention of the author). A list of errata for this book has been
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44 * posted to the sci.crypt newsgroup by the author and is available for FTP.
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45 *
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46 * NOTE:
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47 * This file has a static version of des_setkey() so that crypt.o exports
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48 * only the crypt() interface. This is required to make binaries linked
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49 * against crypt.o exportable or re-exportable from the USA.
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50 */
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51
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52 #include <sys/types.h>
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53 #include <string.h>
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54
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55 extern unsigned long int md_ntohl(unsigned long int x);
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56 extern unsigned long int md_htonl(unsigned long int x);
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57
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58 #define _PASSWORD_EFMT1 '_'
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59
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60 static unsigned char IP[64] = {
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61 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4,
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62 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8,
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63 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3,
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64 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7
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65 };
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66
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67 static unsigned char inv_key_perm[64];
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68 static unsigned char key_perm[56] = {
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69 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18,
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70 10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36,
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71 63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22,
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72 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4
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73 };
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74
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75 static unsigned char key_shifts[16] = {
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76 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
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77 };
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78
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79 static unsigned char inv_comp_perm[56];
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80 static unsigned char comp_perm[48] = {
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81 14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10,
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82 23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2,
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83 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48,
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84 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32
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85 };
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86
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87 /*
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88 * No E box is used, as it's replaced by some ANDs, shifts, and ORs.
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89 */
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90
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91 static unsigned char u_sbox[8][64];