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annotate deps/Platinum/ThirdParty/Neptune/ThirdParty/axTLS/crypto/rc4.c @ 0:3425707ddbf6

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Initial import (hopefully this mercurial stuff works...)
author fraserofthenight
date Mon, 06 Jul 2009 08:06:28 -0700
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1 /*
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2 * Copyright (c) 2007, Cameron Rich
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3 *
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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 without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * * Redistributions of source code must retain the above copyright notice,
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10 * this list of conditions and the following disclaimer.
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11 * * Redistributions in binary form must reproduce the above copyright notice,
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12 * this list of conditions and the following disclaimer in the documentation
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13 * and/or other materials provided with the distribution.
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14 * * Neither the name of the axTLS project nor the names of its contributors
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15 * may be used to endorse or promote products derived from this software
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16 * without specific prior written permission.
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17 *
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18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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22 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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25 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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26 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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27 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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29 */
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30
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31 /**
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32 * An implementation of the RC4/ARC4 algorithm.
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33 * Originally written by Christophe Devine.
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34 */
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35
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36 #include <string.h>
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37 #include "crypto.h"
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38
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39 /**
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40 * Get ready for an encrypt/decrypt operation
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41 */
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42 void RC4_setup(RC4_CTX *ctx, const uint8_t *key, int length)
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43 {
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44 int i, j = 0, k = 0, a;
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45 uint8_t *m;
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46
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47 ctx->x = 0;
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48 ctx->y = 0;
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49 m = ctx->m;
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50
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51 for (i = 0; i < 256; i++)
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52 m[i] = i;
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53
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54 for (i = 0; i < 256; i++)
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55 {
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56 a = m[i];
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57 j = (uint8_t)(j + a + key[k]);
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58 m[i] = m[j];
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59 m[j] = a;
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60
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61 if (++k >= length)
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62 k = 0;
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63 }
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64 }
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65
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66 /**
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67 * Perform the encrypt/decrypt operation (can use it for either since
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68 * this is a stream cipher).
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69 */
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70 void RC4_crypt(RC4_CTX *ctx, const uint8_t *msg, uint8_t *out, int length)
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71 {
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72 int i;
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73 uint8_t *m, x, y, a, b;
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74 out = (uint8_t *)msg;
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75
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76 x = ctx->x;
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77 y = ctx->y;
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78 m = ctx->m;
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79
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80 for (i = 0; i < length; i++)
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81 {
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82 a = m[++x];
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83 y += a;
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84 m[x] = b = m[y];
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85 m[y] = a;
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86 out[i] ^= m[(uint8_t)(a + b)];
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87 }
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88
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89 ctx->x = x;
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90 ctx->y = y;
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91 }