Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/source/fitz/crypt-arc4.c @ 22:d77477b4e151

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Let _int_rc() also handle (i.e. ignore) a local version suffix
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 12:05:57 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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1 /* This code illustrates a sample implementation
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2 * of the Arcfour algorithm
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3 * Copyright (c) April 29, 1997 Kalle Kaukonen.
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4 * All Rights Reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or
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7 * without modification, are permitted provided that this copyright
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8 * notice and disclaimer are retained.
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9 *
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10 * THIS SOFTWARE IS PROVIDED BY KALLE KAUKONEN AND CONTRIBUTORS ``AS
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11 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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12 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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13 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL KALLE
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14 * KAUKONEN OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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15 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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16 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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17 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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18 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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19 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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20 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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21 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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22 */
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23
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24 #include "mupdf/fitz.h"
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25 #include <string.h>
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27 void
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28 fz_arc4_init(fz_arc4 *arc4, const unsigned char *key, size_t keylen)
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29 {
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30 unsigned int t, u;
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31 size_t keyindex;
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32 unsigned int stateindex;
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33 unsigned char *state;
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34 unsigned int counter;
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36 state = arc4->state;
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38 arc4->x = 0;
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39 arc4->y = 0;
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41 for (counter = 0; counter < 256; counter++)
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42 {
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43 state[counter] = counter;
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44 }
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46 keyindex = 0;
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47 stateindex = 0;
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49 for (counter = 0; counter < 256; counter++)
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50 {
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51 t = state[counter];
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52 stateindex = (stateindex + key[keyindex] + t) & 0xff;
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53 u = state[stateindex];
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54
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55 state[stateindex] = t;
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56 state[counter] = u;
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58 if (++keyindex >= keylen)
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59 {
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60 keyindex = 0;
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61 }
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62 }
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63 }
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64
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65 static unsigned char
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66 fz_arc4_next(fz_arc4 *arc4)
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67 {
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68 unsigned int x;
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69 unsigned int y;
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70 unsigned int sx, sy;
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71 unsigned char *state;
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73 state = arc4->state;
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75 x = (arc4->x + 1) & 0xff;
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76 sx = state[x];
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77 y = (sx + arc4->y) & 0xff;
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78 sy = state[y];
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80 arc4->x = x;
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81 arc4->y = y;
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83 state[y] = sx;
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84 state[x] = sy;
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86 return state[(sx + sy) & 0xff];
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87 }
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89 void
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90 fz_arc4_encrypt(fz_arc4 *arc4, unsigned char *dest, const unsigned char *src, size_t len)
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91 {
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92 size_t i;
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93 for (i = 0; i < len; i++)
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94 {
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95 unsigned char x;
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96 x = fz_arc4_next(arc4);
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97 dest[i] = src[i] ^ x;
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98 }
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99 }
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101 void fz_arc4_final(fz_arc4 *state)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
102 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
103 memset(state, 0, sizeof(*state));
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
104 }