[164] | 1 | /* arc4.c
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| 2 | *
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| 3 | * Copyright (C) 2006-2015 wolfSSL Inc.
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| 4 | *
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| 5 | * This file is part of wolfSSL. (formerly known as CyaSSL)
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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 02110-1301, USA
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| 20 | */
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| 21 |
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| 22 | #ifdef HAVE_CONFIG_H
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| 23 | #include <config.h>
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| 24 | #endif
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| 25 |
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| 26 | #include <wolfssl/wolfcrypt/settings.h>
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| 27 |
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| 28 | #ifndef NO_RC4
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| 29 |
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| 30 | #include <wolfssl/wolfcrypt/arc4.h>
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| 31 |
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| 32 | #ifdef HAVE_CAVIUM
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| 33 | static void wc_Arc4CaviumSetKey(Arc4* arc4, const byte* key, word32 length);
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| 34 | static void wc_Arc4CaviumProcess(Arc4* arc4, byte* out, const byte* in,
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| 35 | word32 length);
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| 36 | #endif
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| 37 |
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| 38 |
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| 39 | void wc_Arc4SetKey(Arc4* arc4, const byte* key, word32 length)
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| 40 | {
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| 41 | word32 i;
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| 42 | word32 keyIndex = 0, stateIndex = 0;
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| 43 |
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| 44 | #ifdef HAVE_CAVIUM
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| 45 | if (arc4->magic == WOLFSSL_ARC4_CAVIUM_MAGIC)
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| 46 | return wc_Arc4CaviumSetKey(arc4, key, length);
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| 47 | #endif
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| 48 |
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| 49 | arc4->x = 1;
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| 50 | arc4->y = 0;
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| 51 |
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| 52 | for (i = 0; i < ARC4_STATE_SIZE; i++)
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| 53 | arc4->state[i] = (byte)i;
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| 54 |
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| 55 | for (i = 0; i < ARC4_STATE_SIZE; i++) {
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| 56 | word32 a = arc4->state[i];
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| 57 | stateIndex += key[keyIndex] + a;
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| 58 | stateIndex &= 0xFF;
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| 59 | arc4->state[i] = arc4->state[stateIndex];
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| 60 | arc4->state[stateIndex] = (byte)a;
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| 61 |
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| 62 | if (++keyIndex >= length)
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| 63 | keyIndex = 0;
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| 64 | }
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| 65 | }
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| 66 |
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| 67 |
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| 68 | static INLINE byte MakeByte(word32* x, word32* y, byte* s)
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| 69 | {
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| 70 | word32 a = s[*x], b;
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| 71 | *y = (*y+a) & 0xff;
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| 72 |
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| 73 | b = s[*y];
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| 74 | s[*x] = (byte)b;
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| 75 | s[*y] = (byte)a;
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| 76 | *x = (*x+1) & 0xff;
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| 77 |
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| 78 | return s[(a+b) & 0xff];
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| 79 | }
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| 80 |
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| 81 |
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| 82 | void wc_Arc4Process(Arc4* arc4, byte* out, const byte* in, word32 length)
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| 83 | {
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| 84 | word32 x;
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| 85 | word32 y;
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| 86 |
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| 87 | #ifdef HAVE_CAVIUM
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| 88 | if (arc4->magic == WOLFSSL_ARC4_CAVIUM_MAGIC)
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| 89 | return wc_Arc4CaviumProcess(arc4, out, in, length);
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| 90 | #endif
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| 91 |
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| 92 | x = arc4->x;
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| 93 | y = arc4->y;
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| 94 |
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| 95 | while(length--)
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| 96 | *out++ = *in++ ^ MakeByte(&x, &y, arc4->state);
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| 97 |
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| 98 | arc4->x = (byte)x;
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| 99 | arc4->y = (byte)y;
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| 100 | }
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| 101 |
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| 102 |
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| 103 | #ifdef HAVE_CAVIUM
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| 104 |
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| 105 | #include <wolfssl/wolfcrypt/logging.h>
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| 106 | #include "cavium_common.h"
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| 107 |
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| 108 | /* Initiliaze Arc4 for use with Nitrox device */
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| 109 | int wc_Arc4InitCavium(Arc4* arc4, int devId)
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| 110 | {
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| 111 | if (arc4 == NULL)
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| 112 | return -1;
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| 113 |
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| 114 | if (CspAllocContext(CONTEXT_SSL, &arc4->contextHandle, devId) != 0)
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| 115 | return -1;
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| 116 |
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| 117 | arc4->devId = devId;
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| 118 | arc4->magic = WOLFSSL_ARC4_CAVIUM_MAGIC;
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| 119 |
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| 120 | return 0;
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| 121 | }
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| 122 |
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| 123 |
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| 124 | /* Free Arc4 from use with Nitrox device */
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| 125 | void wc_Arc4FreeCavium(Arc4* arc4)
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| 126 | {
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| 127 | if (arc4 == NULL)
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| 128 | return;
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| 129 |
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| 130 | if (arc4->magic != WOLFSSL_ARC4_CAVIUM_MAGIC)
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| 131 | return;
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| 132 |
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| 133 | CspFreeContext(CONTEXT_SSL, arc4->contextHandle, arc4->devId);
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| 134 | arc4->magic = 0;
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| 135 | }
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| 136 |
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| 137 |
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| 138 | static void wc_Arc4CaviumSetKey(Arc4* arc4, const byte* key, word32 length)
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| 139 | {
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| 140 | word32 requestId;
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| 141 |
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| 142 | if (CspInitializeRc4(CAVIUM_BLOCKING, arc4->contextHandle, length,
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| 143 | (byte*)key, &requestId, arc4->devId) != 0) {
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| 144 | WOLFSSL_MSG("Bad Cavium Arc4 Init");
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| 145 | }
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| 146 | }
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| 147 |
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| 148 |
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| 149 | static void wc_Arc4CaviumProcess(Arc4* arc4, byte* out, const byte* in,
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| 150 | word32 length)
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| 151 | {
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| 152 | wolfssl_word offset = 0;
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| 153 | word32 requestId;
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| 154 |
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| 155 | while (length > WOLFSSL_MAX_16BIT) {
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| 156 | word16 slen = (word16)WOLFSSL_MAX_16BIT;
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| 157 | if (CspEncryptRc4(CAVIUM_BLOCKING, arc4->contextHandle,CAVIUM_UPDATE,
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| 158 | slen, (byte*)in + offset, out + offset, &requestId,
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| 159 | arc4->devId) != 0) {
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| 160 | WOLFSSL_MSG("Bad Cavium Arc4 Encrypt");
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| 161 | }
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| 162 | length -= WOLFSSL_MAX_16BIT;
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| 163 | offset += WOLFSSL_MAX_16BIT;
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| 164 | }
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| 165 | if (length) {
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| 166 | word16 slen = (word16)length;
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| 167 | if (CspEncryptRc4(CAVIUM_BLOCKING, arc4->contextHandle,CAVIUM_UPDATE,
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| 168 | slen, (byte*)in + offset, out + offset, &requestId,
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| 169 | arc4->devId) != 0) {
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| 170 | WOLFSSL_MSG("Bad Cavium Arc4 Encrypt");
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| 171 | }
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| 172 | }
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| 173 | }
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| 174 |
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| 175 | #endif /* HAVE_CAVIUM */
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| 176 |
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| 177 | #endif /* NO_RC4 */
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| 178 |
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