[352] | 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 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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