175 lines
4.3 KiB
C
175 lines
4.3 KiB
C
/* misc.c
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*
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* Copyright (C) 2006-2012 Sawtooth Consulting Ltd.
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*
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* This file is part of CyaSSL.
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*
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* CyaSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* CyaSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <cyassl/ctaocrypt/misc.h>
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/* inlining these functions is a huge speed increase and a small size decrease,
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because the functions are smaller than function call setup/cleanup, e.g.,
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md5 benchmark is twice as fast with inline. If you don't want it, then
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define NO_INLINE and compile this file into cyassl, otherwise it's used as
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a source header
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*/
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#ifdef NO_INLINE
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#define STATIC
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#else
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#define STATIC static
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#endif
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#ifdef INTEL_INTRINSICS
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#include <stdlib.h> /* get intrinsic definitions */
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#pragma intrinsic(_lrotl, _lrotr)
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STATIC INLINE word32 rotlFixed(word32 x, word32 y)
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{
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return y ? _lrotl(x, y) : x;
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}
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STATIC INLINE word32 rotrFixed(word32 x, word32 y)
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{
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return y ? _lrotr(x, y) : x;
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}
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#else /* generic */
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STATIC INLINE word32 rotlFixed(word32 x, word32 y)
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{
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return (x << y) | (x >> (sizeof(y) * 8 - y));
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}
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STATIC INLINE word32 rotrFixed(word32 x, word32 y)
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{
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return (x >> y) | (x << (sizeof(y) * 8 - y));
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}
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#endif
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STATIC INLINE word32 ByteReverseWord32(word32 value)
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{
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#ifdef PPC_INTRINSICS
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/* PPC: load reverse indexed instruction */
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return (word32)__lwbrx(&value,0);
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#elif defined(FAST_ROTATE)
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/* 5 instructions with rotate instruction, 9 without */
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return (rotrFixed(value, 8U) & 0xff00ff00) |
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(rotlFixed(value, 8U) & 0x00ff00ff);
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#else
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/* 6 instructions with rotate instruction, 8 without */
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value = ((value & 0xFF00FF00) >> 8) | ((value & 0x00FF00FF) << 8);
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return rotlFixed(value, 16U);
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#endif
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}
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STATIC INLINE void ByteReverseWords(word32* out, const word32* in,
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word32 byteCount)
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{
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word32 count = byteCount/(word32)sizeof(word32), i;
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for (i = 0; i < count; i++)
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out[i] = ByteReverseWord32(in[i]);
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}
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#ifdef WORD64_AVAILABLE
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STATIC INLINE word64 rotlFixed64(word64 x, word64 y)
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{
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return (x << y) | (x >> (sizeof(y) * 8 - y));
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}
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STATIC INLINE word64 rotrFixed64(word64 x, word64 y)
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{
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return (x >> y) | (x << (sizeof(y) * 8 - y));
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}
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STATIC INLINE word64 ByteReverseWord64(word64 value)
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{
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#ifdef CTAOCRYPT_SLOW_WORD64
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return (word64)(ByteReverseWord32((word32)value)) << 32 |
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ByteReverseWord32((word32)(value>>32));
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#else
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value = ((value & W64LIT(0xFF00FF00FF00FF00)) >> 8) |
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((value & W64LIT(0x00FF00FF00FF00FF)) << 8);
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value = ((value & W64LIT(0xFFFF0000FFFF0000)) >> 16) |
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((value & W64LIT(0x0000FFFF0000FFFF)) << 16);
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return rotlFixed64(value, 32U);
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#endif
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}
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STATIC INLINE void ByteReverseWords64(word64* out, const word64* in,
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word32 byteCount)
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{
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word32 count = byteCount/(word32)sizeof(word64), i;
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for (i = 0; i < count; i++)
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out[i] = ByteReverseWord64(in[i]);
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}
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#endif /* WORD64_AVAILABLE */
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STATIC INLINE void ByteReverseBytes(byte* out, const byte* in, word32 byteCount)
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{
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word32* op = (word32*)out;
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const word32* ip = (const word32*)in;
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ByteReverseWords(op, ip, byteCount);
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}
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STATIC INLINE void XorWords(word* r, const word* a, word32 n)
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{
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word32 i;
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for (i = 0; i < n; i++) r[i] ^= a[i];
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}
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STATIC INLINE void xorbuf(byte* buf, const byte* mask, word32 count)
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{
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if (((word)buf | (word)mask | count) % WORD_SIZE == 0)
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XorWords( (word*)buf, (const word*)mask, count / WORD_SIZE);
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else {
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word32 i;
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for (i = 0; i < count; i++) buf[i] ^= mask[i];
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}
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}
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#undef STATIC
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