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// misc.cpp - written and placed in the public domain by Wei Dai
#include "pch.h"
#ifndef CRYPTOPP_IMPORTS
#include "misc.h"
#include "words.h"
#include <new>
#if defined(CRYPTOPP_MEMALIGN_AVAILABLE) || defined(CRYPTOPP_MM_MALLOC_AVAILABLE) || defined(QNX)
#include <malloc.h>
#endif
NAMESPACE_BEGIN(CryptoPP)
// Vectorization at -O3 requires IsStrictAligned<word64> for GCC 4.8 and above with xorbuf and VerifyBufsEqual.
// Problems have not been experienced for the word32 variant, but it may aoccur in the future.
void xorbuf(byte *buf, const byte *mask, size_t count)
{
size_t i;
if (IsAligned<word32>(buf) && IsAligned<word32>(mask))
{
if (!CRYPTOPP_BOOL_SLOW_WORD64 && IsStrictAligned<word64>(buf) && IsStrictAligned<word64>(mask))
{
assert(IsAlignedOn(buf, GetStrictAlignmentOf<word64>()));
assert(IsAlignedOn(mask, GetStrictAlignmentOf<word64>()));
for (i=0; i<count/8; i++)
((word64*)buf)[i] ^= ((word64*)mask)[i];
count -= 8*i;
if (!count)
return;
buf += 8*i;
mask += 8*i;
}
for (i=0; i<count/4; i++)
((word32*)buf)[i] ^= ((word32*)mask)[i];
count -= 4*i;
if (!count)
return;
buf += 4*i;
mask += 4*i;
}
for (i=0; i<count; i++)
buf[i] ^= mask[i];
}
void xorbuf(byte *output, const byte *input, const byte *mask, size_t count)
{
size_t i;
if (IsAligned<word32>(output) && IsAligned<word32>(input) && IsAligned<word32>(mask))
{
if (!CRYPTOPP_BOOL_SLOW_WORD64 && IsStrictAligned<word64>(output) && IsStrictAligned<word64>(input) && IsStrictAligned<word64>(mask))
{
assert(IsAlignedOn(output, GetStrictAlignmentOf<word64>()));
assert(IsAlignedOn(input, GetStrictAlignmentOf<word64>()));
assert(IsAlignedOn(mask, GetStrictAlignmentOf<word64>()));
for (i=0; i<count/8; i++)
((word64*)output)[i] = ((word64*)input)[i] ^ ((word64*)mask)[i];
count -= 8*i;
if (!count)
return;
output += 8*i;
input += 8*i;
mask += 8*i;
}
for (i=0; i<count/4; i++)
((word32*)output)[i] = ((word32*)input)[i] ^ ((word32*)mask)[i];
count -= 4*i;
if (!count)
return;
output += 4*i;
input += 4*i;
mask += 4*i;
}
for (i=0; i<count; i++)
output[i] = input[i] ^ mask[i];
}
bool VerifyBufsEqual(const byte *buf, const byte *mask, size_t count)
{
size_t i;
byte acc8 = 0;
if (IsAligned<word32>(buf) && IsAligned<word32>(mask))
{
word32 acc32 = 0;
if (!CRYPTOPP_BOOL_SLOW_WORD64 && IsStrictAligned<word64>(buf) && IsStrictAligned<word64>(mask))
{
assert(IsAlignedOn(buf, GetStrictAlignmentOf<word64>()));
assert(IsAlignedOn(mask, GetStrictAlignmentOf<word64>()));
word64 acc64 = 0;
for (i=0; i<count/8; i++)
acc64 |= ((word64*)buf)[i] ^ ((word64*)mask)[i];
count -= 8*i;
if (!count)
return acc64 == 0;
buf += 8*i;
mask += 8*i;
acc32 = word32(acc64) | word32(acc64>>32);
}
for (i=0; i<count/4; i++)
acc32 |= ((word32*)buf)[i] ^ ((word32*)mask)[i];
count -= 4*i;
if (!count)
return acc32 == 0;
buf += 4*i;
mask += 4*i;
acc8 = byte(acc32) | byte(acc32>>8) | byte(acc32>>16) | byte(acc32>>24);
}
for (i=0; i<count; i++)
acc8 |= buf[i] ^ mask[i];
return acc8 == 0;
}
#if !(defined(_MSC_VER) && (_MSC_VER < 1300))
using std::new_handler;
using std::set_new_handler;
#endif
void CallNewHandler()
{
new_handler newHandler = set_new_handler(NULL);
if (newHandler)
set_new_handler(newHandler);
if (newHandler)
newHandler();
else
throw std::bad_alloc();
}
#if CRYPTOPP_BOOL_ALIGN16_ENABLED
void * AlignedAllocate(size_t size)
{
byte *p;
#ifdef CRYPTOPP_MM_MALLOC_AVAILABLE
while (!(p = (byte *)_mm_malloc(size, 16)))
#elif defined(CRYPTOPP_MEMALIGN_AVAILABLE)
while (!(p = (byte *)memalign(16, size)))
#elif defined(CRYPTOPP_MALLOC_ALIGNMENT_IS_16)
while (!(p = (byte *)malloc(size)))
#else
while (!(p = (byte *)malloc(size + 16)))
#endif
CallNewHandler();
#ifdef CRYPTOPP_NO_ALIGNED_ALLOC
size_t adjustment = 16-((size_t)p%16);
p += adjustment;
p[-1] = (byte)adjustment;
#endif
assert(IsAlignedOn(p, 16));
return p;
}
void AlignedDeallocate(void *p)
{
#ifdef CRYPTOPP_MM_MALLOC_AVAILABLE
_mm_free(p);
#elif defined(CRYPTOPP_NO_ALIGNED_ALLOC)
p = (byte *)p - ((byte *)p)[-1];
free(p);
#else
free(p);
#endif
}
#endif
void * UnalignedAllocate(size_t size)
{
void *p;
while (!(p = malloc(size)))
CallNewHandler();
return p;
}
void UnalignedDeallocate(void *p)
{
free(p);
}
NAMESPACE_END
#endif
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