Xuyi Wang / wolfSSL

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wolfcrypt/src/arc4.c@0:d92f9d21154c, 2015-06-26 (annotated)

Committer:
wolfSSL
Date:
Fri Jun 26 00:39:20 2015 +0000
Revision:
0:d92f9d21154c
wolfSSL 3.6.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
wolfSSL 0:d92f9d21154c 1 /* arc4.c
wolfSSL 0:d92f9d21154c 2 *
wolfSSL 0:d92f9d21154c 3 * Copyright (C) 2006-2015 wolfSSL Inc.
wolfSSL 0:d92f9d21154c 4 *
wolfSSL 0:d92f9d21154c 5 * This file is part of wolfSSL. (formerly known as CyaSSL)
wolfSSL 0:d92f9d21154c 6 *
wolfSSL 0:d92f9d21154c 7 * wolfSSL is free software; you can redistribute it and/or modify
wolfSSL 0:d92f9d21154c 8 * it under the terms of the GNU General Public License as published by
wolfSSL 0:d92f9d21154c 9 * the Free Software Foundation; either version 2 of the License, or
wolfSSL 0:d92f9d21154c 10 * (at your option) any later version.
wolfSSL 0:d92f9d21154c 11 *
wolfSSL 0:d92f9d21154c 12 * wolfSSL is distributed in the hope that it will be useful,
wolfSSL 0:d92f9d21154c 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
wolfSSL 0:d92f9d21154c 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
wolfSSL 0:d92f9d21154c 15 * GNU General Public License for more details.
wolfSSL 0:d92f9d21154c 16 *
wolfSSL 0:d92f9d21154c 17 * You should have received a copy of the GNU General Public License
wolfSSL 0:d92f9d21154c 18 * along with this program; if not, write to the Free Software
wolfSSL 0:d92f9d21154c 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
wolfSSL 0:d92f9d21154c 20 */
wolfSSL 0:d92f9d21154c 21
wolfSSL 0:d92f9d21154c 22 #ifdef HAVE_CONFIG_H
wolfSSL 0:d92f9d21154c 23 #include <config.h>
wolfSSL 0:d92f9d21154c 24 #endif
wolfSSL 0:d92f9d21154c 25
wolfSSL 0:d92f9d21154c 26 #include <wolfssl/wolfcrypt/settings.h>
wolfSSL 0:d92f9d21154c 27
wolfSSL 0:d92f9d21154c 28 #ifndef NO_RC4
wolfSSL 0:d92f9d21154c 29
wolfSSL 0:d92f9d21154c 30 #include <wolfssl/wolfcrypt/arc4.h>
wolfSSL 0:d92f9d21154c 31
wolfSSL 0:d92f9d21154c 32 #ifdef HAVE_CAVIUM
wolfSSL 0:d92f9d21154c 33 static void wc_Arc4CaviumSetKey(Arc4* arc4, const byte* key, word32 length);
wolfSSL 0:d92f9d21154c 34 static void wc_Arc4CaviumProcess(Arc4* arc4, byte* out, const byte* in,
wolfSSL 0:d92f9d21154c 35 word32 length);
wolfSSL 0:d92f9d21154c 36 #endif
wolfSSL 0:d92f9d21154c 37
wolfSSL 0:d92f9d21154c 38
wolfSSL 0:d92f9d21154c 39 void wc_Arc4SetKey(Arc4* arc4, const byte* key, word32 length)
wolfSSL 0:d92f9d21154c 40 {
wolfSSL 0:d92f9d21154c 41 word32 i;
wolfSSL 0:d92f9d21154c 42 word32 keyIndex = 0, stateIndex = 0;
wolfSSL 0:d92f9d21154c 43
wolfSSL 0:d92f9d21154c 44 #ifdef HAVE_CAVIUM
wolfSSL 0:d92f9d21154c 45 if (arc4->magic == WOLFSSL_ARC4_CAVIUM_MAGIC)
wolfSSL 0:d92f9d21154c 46 return wc_Arc4CaviumSetKey(arc4, key, length);
wolfSSL 0:d92f9d21154c 47 #endif
wolfSSL 0:d92f9d21154c 48
wolfSSL 0:d92f9d21154c 49 arc4->x = 1;
wolfSSL 0:d92f9d21154c 50 arc4->y = 0;
wolfSSL 0:d92f9d21154c 51
wolfSSL 0:d92f9d21154c 52 for (i = 0; i < ARC4_STATE_SIZE; i++)
wolfSSL 0:d92f9d21154c 53 arc4->state[i] = (byte)i;
wolfSSL 0:d92f9d21154c 54
wolfSSL 0:d92f9d21154c 55 for (i = 0; i < ARC4_STATE_SIZE; i++) {
wolfSSL 0:d92f9d21154c 56 word32 a = arc4->state[i];
wolfSSL 0:d92f9d21154c 57 stateIndex += key[keyIndex] + a;
wolfSSL 0:d92f9d21154c 58 stateIndex &= 0xFF;
wolfSSL 0:d92f9d21154c 59 arc4->state[i] = arc4->state[stateIndex];
wolfSSL 0:d92f9d21154c 60 arc4->state[stateIndex] = (byte)a;
wolfSSL 0:d92f9d21154c 61
wolfSSL 0:d92f9d21154c 62 if (++keyIndex >= length)
wolfSSL 0:d92f9d21154c 63 keyIndex = 0;
wolfSSL 0:d92f9d21154c 64 }
wolfSSL 0:d92f9d21154c 65 }
wolfSSL 0:d92f9d21154c 66
wolfSSL 0:d92f9d21154c 67
wolfSSL 0:d92f9d21154c 68 static INLINE byte MakeByte(word32* x, word32* y, byte* s)
wolfSSL 0:d92f9d21154c 69 {
wolfSSL 0:d92f9d21154c 70 word32 a = s[*x], b;
wolfSSL 0:d92f9d21154c 71 *y = (*y+a) & 0xff;
wolfSSL 0:d92f9d21154c 72
wolfSSL 0:d92f9d21154c 73 b = s[*y];
wolfSSL 0:d92f9d21154c 74 s[*x] = (byte)b;
wolfSSL 0:d92f9d21154c 75 s[*y] = (byte)a;
wolfSSL 0:d92f9d21154c 76 *x = (*x+1) & 0xff;
wolfSSL 0:d92f9d21154c 77
wolfSSL 0:d92f9d21154c 78 return s[(a+b) & 0xff];
wolfSSL 0:d92f9d21154c 79 }
wolfSSL 0:d92f9d21154c 80
wolfSSL 0:d92f9d21154c 81
wolfSSL 0:d92f9d21154c 82 void wc_Arc4Process(Arc4* arc4, byte* out, const byte* in, word32 length)
wolfSSL 0:d92f9d21154c 83 {
wolfSSL 0:d92f9d21154c 84 word32 x;
wolfSSL 0:d92f9d21154c 85 word32 y;
wolfSSL 0:d92f9d21154c 86
wolfSSL 0:d92f9d21154c 87 #ifdef HAVE_CAVIUM
wolfSSL 0:d92f9d21154c 88 if (arc4->magic == WOLFSSL_ARC4_CAVIUM_MAGIC)
wolfSSL 0:d92f9d21154c 89 return wc_Arc4CaviumProcess(arc4, out, in, length);
wolfSSL 0:d92f9d21154c 90 #endif
wolfSSL 0:d92f9d21154c 91
wolfSSL 0:d92f9d21154c 92 x = arc4->x;
wolfSSL 0:d92f9d21154c 93 y = arc4->y;
wolfSSL 0:d92f9d21154c 94
wolfSSL 0:d92f9d21154c 95 while(length--)
wolfSSL 0:d92f9d21154c 96 *out++ = *in++ ^ MakeByte(&x, &y, arc4->state);
wolfSSL 0:d92f9d21154c 97
wolfSSL 0:d92f9d21154c 98 arc4->x = (byte)x;
wolfSSL 0:d92f9d21154c 99 arc4->y = (byte)y;
wolfSSL 0:d92f9d21154c 100 }
wolfSSL 0:d92f9d21154c 101
wolfSSL 0:d92f9d21154c 102
wolfSSL 0:d92f9d21154c 103 #ifdef HAVE_CAVIUM
wolfSSL 0:d92f9d21154c 104
wolfSSL 0:d92f9d21154c 105 #include <wolfssl/wolfcrypt/logging.h>
wolfSSL 0:d92f9d21154c 106 #include "cavium_common.h"
wolfSSL 0:d92f9d21154c 107
wolfSSL 0:d92f9d21154c 108 /* Initiliaze Arc4 for use with Nitrox device */
wolfSSL 0:d92f9d21154c 109 int wc_Arc4InitCavium(Arc4* arc4, int devId)
wolfSSL 0:d92f9d21154c 110 {
wolfSSL 0:d92f9d21154c 111 if (arc4 == NULL)
wolfSSL 0:d92f9d21154c 112 return -1;
wolfSSL 0:d92f9d21154c 113
wolfSSL 0:d92f9d21154c 114 if (CspAllocContext(CONTEXT_SSL, &arc4->contextHandle, devId) != 0)
wolfSSL 0:d92f9d21154c 115 return -1;
wolfSSL 0:d92f9d21154c 116
wolfSSL 0:d92f9d21154c 117 arc4->devId = devId;
wolfSSL 0:d92f9d21154c 118 arc4->magic = WOLFSSL_ARC4_CAVIUM_MAGIC;
wolfSSL 0:d92f9d21154c 119
wolfSSL 0:d92f9d21154c 120 return 0;
wolfSSL 0:d92f9d21154c 121 }
wolfSSL 0:d92f9d21154c 122
wolfSSL 0:d92f9d21154c 123
wolfSSL 0:d92f9d21154c 124 /* Free Arc4 from use with Nitrox device */
wolfSSL 0:d92f9d21154c 125 void wc_Arc4FreeCavium(Arc4* arc4)
wolfSSL 0:d92f9d21154c 126 {
wolfSSL 0:d92f9d21154c 127 if (arc4 == NULL)
wolfSSL 0:d92f9d21154c 128 return;
wolfSSL 0:d92f9d21154c 129
wolfSSL 0:d92f9d21154c 130 if (arc4->magic != WOLFSSL_ARC4_CAVIUM_MAGIC)
wolfSSL 0:d92f9d21154c 131 return;
wolfSSL 0:d92f9d21154c 132
wolfSSL 0:d92f9d21154c 133 CspFreeContext(CONTEXT_SSL, arc4->contextHandle, arc4->devId);
wolfSSL 0:d92f9d21154c 134 arc4->magic = 0;
wolfSSL 0:d92f9d21154c 135 }
wolfSSL 0:d92f9d21154c 136
wolfSSL 0:d92f9d21154c 137
wolfSSL 0:d92f9d21154c 138 static void wc_Arc4CaviumSetKey(Arc4* arc4, const byte* key, word32 length)
wolfSSL 0:d92f9d21154c 139 {
wolfSSL 0:d92f9d21154c 140 word32 requestId;
wolfSSL 0:d92f9d21154c 141
wolfSSL 0:d92f9d21154c 142 if (CspInitializeRc4(CAVIUM_BLOCKING, arc4->contextHandle, length,
wolfSSL 0:d92f9d21154c 143 (byte*)key, &requestId, arc4->devId) != 0) {
wolfSSL 0:d92f9d21154c 144 WOLFSSL_MSG("Bad Cavium Arc4 Init");
wolfSSL 0:d92f9d21154c 145 }
wolfSSL 0:d92f9d21154c 146 }
wolfSSL 0:d92f9d21154c 147
wolfSSL 0:d92f9d21154c 148
wolfSSL 0:d92f9d21154c 149 static void wc_Arc4CaviumProcess(Arc4* arc4, byte* out, const byte* in,
wolfSSL 0:d92f9d21154c 150 word32 length)
wolfSSL 0:d92f9d21154c 151 {
wolfSSL 0:d92f9d21154c 152 wolfssl_word offset = 0;
wolfSSL 0:d92f9d21154c 153 word32 requestId;
wolfSSL 0:d92f9d21154c 154
wolfSSL 0:d92f9d21154c 155 while (length > WOLFSSL_MAX_16BIT) {
wolfSSL 0:d92f9d21154c 156 word16 slen = (word16)WOLFSSL_MAX_16BIT;
wolfSSL 0:d92f9d21154c 157 if (CspEncryptRc4(CAVIUM_BLOCKING, arc4->contextHandle,CAVIUM_UPDATE,
wolfSSL 0:d92f9d21154c 158 slen, (byte*)in + offset, out + offset, &requestId,
wolfSSL 0:d92f9d21154c 159 arc4->devId) != 0) {
wolfSSL 0:d92f9d21154c 160 WOLFSSL_MSG("Bad Cavium Arc4 Encrypt");
wolfSSL 0:d92f9d21154c 161 }
wolfSSL 0:d92f9d21154c 162 length -= WOLFSSL_MAX_16BIT;
wolfSSL 0:d92f9d21154c 163 offset += WOLFSSL_MAX_16BIT;
wolfSSL 0:d92f9d21154c 164 }
wolfSSL 0:d92f9d21154c 165 if (length) {
wolfSSL 0:d92f9d21154c 166 word16 slen = (word16)length;
wolfSSL 0:d92f9d21154c 167 if (CspEncryptRc4(CAVIUM_BLOCKING, arc4->contextHandle,CAVIUM_UPDATE,
wolfSSL 0:d92f9d21154c 168 slen, (byte*)in + offset, out + offset, &requestId,
wolfSSL 0:d92f9d21154c 169 arc4->devId) != 0) {
wolfSSL 0:d92f9d21154c 170 WOLFSSL_MSG("Bad Cavium Arc4 Encrypt");
wolfSSL 0:d92f9d21154c 171 }
wolfSSL 0:d92f9d21154c 172 }
wolfSSL 0:d92f9d21154c 173 }
wolfSSL 0:d92f9d21154c 174
wolfSSL 0:d92f9d21154c 175 #endif /* HAVE_CAVIUM */
wolfSSL 0:d92f9d21154c 176
wolfSSL 0:d92f9d21154c 177 #endif /* NO_RC4 */
wolfSSL 0:d92f9d21154c 178
wolfSSL 0:d92f9d21154c 179