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Use memcpy for unaligned accesses

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman
2022-11-24 19:33:22 +00:00
parent fbc23225d6
commit 96d61d14d8
2 changed files with 27 additions and 41 deletions
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18
library/common.h
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@ -88,24 +88,16 @@ extern void (*mbedtls_test_hook_test_fail)( const char * test, int line, const c
*/
inline void mbedtls_xor( unsigned char *r, unsigned char const *a, unsigned char const *b, size_t n )
{
#if defined(MBEDTLS_ALLOW_UNALIGNED_ACCESS)
UNALIGNED_UINT32_T *a32 = (uint32_t *)a;
UNALIGNED_UINT32_T *b32 = (uint32_t *)b;
UNALIGNED_UINT32_T *r32 = (uint32_t *)r;
for ( size_t i = 0; i < ( n >> 2 ); i++ )
size_t i;
for ( i = 0; (i + 4) < n; i+= 4 )
{
r32[i] = a32[i] ^ b32[i];
uint32_t x = mbedtls_get_unaligned_uint32(a + i) ^ mbedtls_get_unaligned_uint32(b + i);
mbedtls_put_unaligned_uint32(r + i, x);
}
for ( size_t i = n - ( n % 4 ) ; i < n; i++ )
for ( ; i < n; i++ )
{
r[i] = a[i] ^ b[i];
}
#else
for ( size_t i = 0; i < n; i++ )
{
r[i] = a[i] ^ b[i];
}
#endif
}
/* Fix MSVC C99 compatible issue