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/* misc.c
*
* Copyright (C) 2006-2011 Sawtooth Consulting Ltd.
*
* 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
*/
#include "misc.h"
/* inlining these functions is a huge speed increase and a small size decrease,
because the functions are smaller than function call setup/cleanup, e.g.,
md5 benchmark is twice as fast with inline. If you don't want it, then
define NO_INLINE and compile this file into cyassl, otherwise it's used as
a source header
*/
#ifdef NO_INLINE
#define STATIC
#else
#define STATIC static
#endif
#ifdef INTEL_INTRINSICS
#include <stdlib.h> /* get intrinsic definitions */
#pragma intrinsic(_lrotl, _lrotr)
STATIC INLINE word32 rotlFixed(word32 x, word32 y)
{
return y ? _lrotl(x, y) : x;
}
STATIC INLINE word32 rotrFixed(word32 x, word32 y)
{
return y ? _lrotr(x, y) : x;
}
#else /* generic */
STATIC INLINE word32 rotlFixed(word32 x, word32 y)
{
return (x << y) | (x >> (sizeof(y) * 8 - y));
}
STATIC INLINE word32 rotrFixed(word32 x, word32 y)
{
return (x >> y) | (x << (sizeof(y) * 8 - y));
}
#endif
STATIC INLINE word32 ByteReverseWord32(word32 value)
{
#ifdef PPC_INTRINSICS
/* PPC: load reverse indexed instruction */
return (word32)__lwbrx(&value,0);
#elif defined(FAST_ROTATE)
/* 5 instructions with rotate instruction, 9 without */
return (rotrFixed(value, 8U) & 0xff00ff00) |
(rotlFixed(value, 8U) & 0x00ff00ff);
#else
/* 6 instructions with rotate instruction, 8 without */
value = ((value & 0xFF00FF00) >> 8) | ((value & 0x00FF00FF) << 8);
return rotlFixed(value, 16U);
#endif
}
STATIC INLINE void ByteReverseWords(word32* out, const word32* in,
word32 byteCount)
{
word32 count = byteCount/sizeof(word32), i;
for (i = 0; i < count; i++)
out[i] = ByteReverseWord32(in[i]);
}
#ifdef WORD64_AVAILABLE
STATIC INLINE word64 rotlFixed64(word64 x, word64 y)
{
return (x << y) | (x >> (sizeof(y) * 8 - y));
}
STATIC INLINE word64 rotrFixed64(word64 x, word64 y)
{
return (x >> y) | (x << (sizeof(y) * 8 - y));
}
STATIC INLINE word64 ByteReverseWord64(word64 value)
{
#ifdef CTAOCRYPT_SLOW_WORD64
return (word64)(ByteReverseWord32((word32)value)) << 32 |
ByteReverseWord32((word32)(value>>32));
#else
value = ((value & W64LIT(0xFF00FF00FF00FF00)) >> 8) |
((value & W64LIT(0x00FF00FF00FF00FF)) << 8);
value = ((value & W64LIT(0xFFFF0000FFFF0000)) >> 16) |
((value & W64LIT(0x0000FFFF0000FFFF)) << 16);
return rotlFixed64(value, 32U);
#endif
}
STATIC INLINE void ByteReverseWords64(word64* out, const word64* in,
word32 byteCount)
{
word32 count = byteCount/sizeof(word64), i;
for (i = 0; i < count; i++)
out[i] = ByteReverseWord64(in[i]);
}
#endif /* WORD64_AVAILABLE */
STATIC INLINE void ByteReverseBytes(byte* out, const byte* in, word32 byteCount)
{
word32* op = (word32*)out;
const word32* ip = (const word32*)in;
ByteReverseWords(op, ip, byteCount);
}
STATIC INLINE void XorWords(word* r, const word* a, word32 n)
{
word32 i;
for (i = 0; i < n; i++) r[i] ^= a[i];
}
STATIC INLINE void xorbuf(byte* buf, const byte* mask, word32 count)
{
if (((size_t)buf | (size_t)mask | count) % WORD_SIZE == 0)
XorWords( (word*)buf, (const word*)mask, count / WORD_SIZE);
else {
word32 i;
for (i = 0; i < count; i++) buf[i] ^= mask[i];
}
}
#undef STATIC
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