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dhm_check_range: microoptimization

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No need to build a bignum for the value 2.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-03-31 22:56:43 +02:00
parent 87fdb1f872
commit 58df4c9098
1 changed files with 4 additions and 5 deletions
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9
library/dhm.c
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@ -100,22 +100,21 @@ static int dhm_read_bignum( mbedtls_mpi *X,
*/
static int dhm_check_range( const mbedtls_mpi *param, const mbedtls_mpi *P )
{
mbedtls_mpi L, U;
mbedtls_mpi U;
int ret = 0;
mbedtls_mpi_init( &L ); mbedtls_mpi_init( &U );
mbedtls_mpi_init( &U );
MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &L, 2 ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &U, P, 2 ) );
if( mbedtls_mpi_cmp_mpi( param, &L ) < 0 ||
if( mbedtls_mpi_cmp_int( param, 2 ) < 0 ||
mbedtls_mpi_cmp_mpi( param, &U ) > 0 )
{
ret = MBEDTLS_ERR_DHM_BAD_INPUT_DATA;
}
cleanup:
mbedtls_mpi_free( &L ); mbedtls_mpi_free( &U );
mbedtls_mpi_free( &U );
return( ret );
}