1 | /* arc4.c
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2 | *
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3 | * Copyright (C) 2006-2017 wolfSSL Inc.
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4 | *
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5 | * This file is part of wolfSSL.
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6 | *
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7 | * wolfSSL is free software; you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation; either version 2 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * wolfSSL is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with this program; if not, write to the Free Software
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
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20 | */
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21 |
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22 |
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23 | #ifdef HAVE_CONFIG_H
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24 | #include <config.h>
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25 | #endif
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26 |
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27 | #include <wolfssl/wolfcrypt/settings.h>
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28 |
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29 | #ifndef NO_RC4
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30 |
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31 | #include <wolfssl/wolfcrypt/error-crypt.h>
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32 | #include <wolfssl/wolfcrypt/arc4.h>
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33 |
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34 |
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35 | int wc_Arc4SetKey(Arc4* arc4, const byte* key, word32 length)
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36 | {
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37 | int ret = 0;
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38 | word32 i;
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39 | word32 keyIndex = 0, stateIndex = 0;
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40 |
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41 | if (arc4 == NULL || key == NULL) {
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42 | return BAD_FUNC_ARG;
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43 | }
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44 |
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45 | #if defined(WOLFSSL_ASYNC_CRYPT) && defined(WC_ASYNC_ENABLE_ARC4) && \
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46 | defined(HAVE_CAVIUM) && !defined(HAVE_CAVIUM_V)
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47 | if (arc4->asyncDev.marker == WOLFSSL_ASYNC_MARKER_ARC4) {
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48 | return NitroxArc4SetKey(arc4, key, length);
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49 | }
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50 | #endif
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51 |
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52 | arc4->x = 1;
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53 | arc4->y = 0;
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54 |
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55 | for (i = 0; i < ARC4_STATE_SIZE; i++)
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56 | arc4->state[i] = (byte)i;
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57 |
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58 | for (i = 0; i < ARC4_STATE_SIZE; i++) {
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59 | word32 a = arc4->state[i];
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60 | stateIndex += key[keyIndex] + a;
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61 | stateIndex &= 0xFF;
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62 | arc4->state[i] = arc4->state[stateIndex];
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63 | arc4->state[stateIndex] = (byte)a;
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64 |
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65 | if (++keyIndex >= length)
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66 | keyIndex = 0;
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67 | }
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68 |
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69 | return ret;
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70 | }
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71 |
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72 |
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73 | static WC_INLINE byte MakeByte(word32* x, word32* y, byte* s)
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74 | {
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75 | word32 a = s[*x], b;
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76 | *y = (*y+a) & 0xff;
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77 |
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78 | b = s[*y];
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79 | s[*x] = (byte)b;
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80 | s[*y] = (byte)a;
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81 | *x = (*x+1) & 0xff;
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82 |
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83 | return s[(a+b) & 0xff];
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84 | }
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85 |
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86 |
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87 | int wc_Arc4Process(Arc4* arc4, byte* out, const byte* in, word32 length)
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88 | {
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89 | int ret = 0;
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90 | word32 x;
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91 | word32 y;
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92 |
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93 | if (arc4 == NULL || out == NULL || in == NULL) {
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94 | return BAD_FUNC_ARG;
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95 | }
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96 |
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97 | #if defined(WOLFSSL_ASYNC_CRYPT) && defined(WC_ASYNC_ENABLE_ARC4) && \
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98 | defined(HAVE_CAVIUM) && !defined(HAVE_CAVIUM_V)
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99 | if (arc4->asyncDev.marker == WOLFSSL_ASYNC_MARKER_ARC4) {
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100 | return NitroxArc4Process(arc4, out, in, length);
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101 | }
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102 | #endif
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103 |
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104 | x = arc4->x;
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105 | y = arc4->y;
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106 |
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107 | while(length--)
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108 | *out++ = *in++ ^ MakeByte(&x, &y, arc4->state);
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109 |
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110 | arc4->x = (byte)x;
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111 | arc4->y = (byte)y;
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112 |
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113 | return ret;
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114 | }
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115 |
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116 | /* Initialize Arc4 for use with async device */
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117 | int wc_Arc4Init(Arc4* arc4, void* heap, int devId)
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118 | {
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119 | int ret = 0;
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120 |
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121 | if (arc4 == NULL)
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122 | return BAD_FUNC_ARG;
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123 |
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124 | arc4->heap = heap;
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125 |
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126 | #if defined(WOLFSSL_ASYNC_CRYPT) && defined(WC_ASYNC_ENABLE_ARC4)
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127 | ret = wolfAsync_DevCtxInit(&arc4->asyncDev, WOLFSSL_ASYNC_MARKER_ARC4,
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128 | arc4->heap, devId);
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129 | #else
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130 | (void)devId;
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131 | #endif /* WOLFSSL_ASYNC_CRYPT */
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132 |
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133 | return ret;
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134 | }
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135 |
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136 |
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137 | /* Free Arc4 from use with async device */
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138 | void wc_Arc4Free(Arc4* arc4)
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139 | {
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140 | if (arc4 == NULL)
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141 | return;
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142 |
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143 | #if defined(WOLFSSL_ASYNC_CRYPT) && defined(WC_ASYNC_ENABLE_ARC4)
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144 | wolfAsync_DevCtxFree(&arc4->asyncDev, WOLFSSL_ASYNC_MARKER_ARC4);
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145 | #endif /* WOLFSSL_ASYNC_CRYPT */
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146 | }
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147 |
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148 | #endif /* NO_RC4 */
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149 |
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