mpi_mod_exp: be pedantic about right shift
The window size starts giving diminishing returns around 6 on most
platforms and highly unlikely to be more than 31 in practical use cases.
Still, compilers and static analysers might complain about this and
better to be pedantic.
Co-authored-by: Gilles Peskine <gilles.peskine@arm.com>
Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/library/bignum.c b/library/bignum.c
index b68a15e..53d1649 100644
--- a/library/bignum.c
+++ b/library/bignum.c
@@ -2005,7 +2005,7 @@
window_bitsize = ( i > 671 ) ? 6 : ( i > 239 ) ? 5 :
( i > 79 ) ? 4 : ( i > 23 ) ? 3 : 1;
- const size_t w_table_used_size = ( 1 << window_bitsize ) + 1;
+ const size_t w_table_used_size = ( (size_t)1 << window_bitsize ) + 1;
#if( MBEDTLS_MPI_WINDOW_SIZE < 6 )
if( window_bitsize > MBEDTLS_MPI_WINDOW_SIZE )
