SSL/TLS Library
CyaSSL is SSL/TLS library for embedded systems.
Diff: ctaocrypt/src/arc4.c
- Revision:
- 0:9d17e4342598
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/ctaocrypt/src/arc4.c Sun Apr 20 12:40:57 2014 +0000 @@ -0,0 +1,179 @@ +/* arc4.c + * + * Copyright (C) 2006-2013 wolfSSL Inc. + * + * This file is part of CyaSSL. + * + * CyaSSL is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * CyaSSL is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA + */ + +#ifdef HAVE_CONFIG_H + #include <config.h> +#endif + +#include <cyassl/ctaocrypt/settings.h> + +#ifndef NO_RC4 + +#include <cyassl/ctaocrypt/arc4.h> + + +#ifdef HAVE_CAVIUM + static void Arc4CaviumSetKey(Arc4* arc4, const byte* key, word32 length); + static void Arc4CaviumProcess(Arc4* arc4, byte* out, const byte* in, + word32 length); +#endif + + +void Arc4SetKey(Arc4* arc4, const byte* key, word32 length) +{ + word32 i; + word32 keyIndex = 0, stateIndex = 0; + +#ifdef HAVE_CAVIUM + if (arc4->magic == CYASSL_ARC4_CAVIUM_MAGIC) + return Arc4CaviumSetKey(arc4, key, length); +#endif + + arc4->x = 1; + arc4->y = 0; + + for (i = 0; i < ARC4_STATE_SIZE; i++) + arc4->state[i] = (byte)i; + + for (i = 0; i < ARC4_STATE_SIZE; i++) { + word32 a = arc4->state[i]; + stateIndex += key[keyIndex] + a; + stateIndex &= 0xFF; + arc4->state[i] = arc4->state[stateIndex]; + arc4->state[stateIndex] = (byte)a; + + if (++keyIndex >= length) + keyIndex = 0; + } +} + + +static INLINE byte MakeByte(word32* x, word32* y, byte* s) +{ + word32 a = s[*x], b; + *y = (*y+a) & 0xff; + + b = s[*y]; + s[*x] = (byte)b; + s[*y] = (byte)a; + *x = (*x+1) & 0xff; + + return s[(a+b) & 0xff]; +} + + +void Arc4Process(Arc4* arc4, byte* out, const byte* in, word32 length) +{ + word32 x; + word32 y; + +#ifdef HAVE_CAVIUM + if (arc4->magic == CYASSL_ARC4_CAVIUM_MAGIC) + return Arc4CaviumProcess(arc4, out, in, length); +#endif + + x = arc4->x; + y = arc4->y; + + while(length--) + *out++ = *in++ ^ MakeByte(&x, &y, arc4->state); + + arc4->x = (byte)x; + arc4->y = (byte)y; +} + + +#ifdef HAVE_CAVIUM + +#include <cyassl/ctaocrypt/logging.h> +#include "cavium_common.h" + +/* Initiliaze Arc4 for use with Nitrox device */ +int Arc4InitCavium(Arc4* arc4, int devId) +{ + if (arc4 == NULL) + return -1; + + if (CspAllocContext(CONTEXT_SSL, &arc4->contextHandle, devId) != 0) + return -1; + + arc4->devId = devId; + arc4->magic = CYASSL_ARC4_CAVIUM_MAGIC; + + return 0; +} + + +/* Free Arc4 from use with Nitrox device */ +void Arc4FreeCavium(Arc4* arc4) +{ + if (arc4 == NULL) + return; + + if (arc4->magic != CYASSL_ARC4_CAVIUM_MAGIC) + return; + + CspFreeContext(CONTEXT_SSL, arc4->contextHandle, arc4->devId); + arc4->magic = 0; +} + + +static void Arc4CaviumSetKey(Arc4* arc4, const byte* key, word32 length) +{ + word32 requestId; + + if (CspInitializeRc4(CAVIUM_BLOCKING, arc4->contextHandle, length, + (byte*)key, &requestId, arc4->devId) != 0) { + CYASSL_MSG("Bad Cavium Arc4 Init"); + } +} + + +static void Arc4CaviumProcess(Arc4* arc4, byte* out, const byte* in, + word32 length) +{ + word offset = 0; + word32 requestId; + + while (length > CYASSL_MAX_16BIT) { + word16 slen = (word16)CYASSL_MAX_16BIT; + if (CspEncryptRc4(CAVIUM_BLOCKING, arc4->contextHandle,CAVIUM_UPDATE, + slen, (byte*)in + offset, out + offset, &requestId, + arc4->devId) != 0) { + CYASSL_MSG("Bad Cavium Arc4 Encrypt"); + } + length -= CYASSL_MAX_16BIT; + offset += CYASSL_MAX_16BIT; + } + if (length) { + word16 slen = (word16)length; + if (CspEncryptRc4(CAVIUM_BLOCKING, arc4->contextHandle,CAVIUM_UPDATE, + slen, (byte*)in + offset, out + offset, &requestId, + arc4->devId) != 0) { + CYASSL_MSG("Bad Cavium Arc4 Encrypt"); + } + } +} + +#endif /* HAVE_CAVIUM */ + +#endif /* NO_ARC4 */ +