ecp_curves: Adjusted expected_width inputs to use `BITS_TO_LIMBS` macro.
Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
diff --git a/library/bignum_mod_raw.c b/library/bignum_mod_raw.c
index 8f7270a..bf72c18 100644
--- a/library/bignum_mod_raw.c
+++ b/library/bignum_mod_raw.c
@@ -131,18 +131,11 @@
mbedtls_mpi_uint *T)
{
/* Standard (A * B) multiplication stored into pre-allocated T
- * buffer of fixed limb size of (2N + 1).
+ * buffer of fixed limb size of (2N + 1).
*
- * The space may not not fully filled by when
- * MBEDTLS_MPI_MOD_REP_OPT_RED is used, where we only need
- * (2N) or (2N-1) limbs (depending on limb size and curve).
- *
- * The 521-bit Weierstrass curve is the only
- * that which requires a limb size of (2N). */
- const size_t T_limbs = (N->bits == 521) ?
- BITS_TO_LIMBS(N->bits * 2) + 1 :
- BITS_TO_LIMBS(N->bits * 2);
-
+ * The space may not not fully filled by when
+ * MBEDTLS_MPI_MOD_REP_OPT_RED is used. */
+ const size_t T_limbs = BITS_TO_LIMBS(N->bits) * 2;
switch (N->int_rep) {
case MBEDTLS_MPI_MOD_REP_MONTGOMERY:
mbedtls_mpi_core_montmul(X, A, B, N->limbs, N->p, N->limbs,