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Make use of optimised bswap from bignum

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2022-11-28 14:38:53 +00:00
parent f7f1f748e3
commit 6d23ff60dd
1 changed files with 16 additions and 36 deletions
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36
library/bignum_core.c
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@ -83,46 +83,26 @@ static mbedtls_mpi_uint mpi_bigendian_to_host_c( mbedtls_mpi_uint a )
static mbedtls_mpi_uint mpi_bigendian_to_host( mbedtls_mpi_uint a )
{
#if defined(__BYTE_ORDER__)
if ( MBEDTLS_IS_BIG_ENDIAN )
{
/* Nothing to do on bigendian systems. */
#if ( __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ )
return( a );
#endif /* __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ */
#if ( __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ )
/* For GCC and Clang, have builtins for byte swapping. */
#if defined(__GNUC__) && defined(__GNUC_PREREQ)
#if __GNUC_PREREQ(4,3)
#define have_bswap
#endif
#endif
#if defined(__clang__) && defined(__has_builtin)
#if __has_builtin(__builtin_bswap32) && \
__has_builtin(__builtin_bswap64)
#define have_bswap
#endif
#endif
#if defined(have_bswap)
/* The compiler is hopefully able to statically evaluate this! */
}
else
{
switch( sizeof(mbedtls_mpi_uint) )
{
case 4:
return( __builtin_bswap32(a) );
return (mbedtls_mpi_uint) MBEDTLS_BSWAP32( (uint32_t)a );
case 8:
return( __builtin_bswap64(a) );
return (mbedtls_mpi_uint) MBEDTLS_BSWAP64( (uint64_t)a );
}
#endif
#endif /* __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ */
#endif /* __BYTE_ORDER__ */
/* Fall back to C-based reordering if we don't know the byte order
* or we couldn't use a compiler-specific builtin. */
return( mpi_bigendian_to_host_c( a ) );
}
}
void mbedtls_mpi_core_bigendian_to_host( mbedtls_mpi_uint *A,
size_t A_limbs )