Fix 0 limb size for value 0
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
diff --git a/scripts/mbedtls_dev/bignum_common.py b/scripts/mbedtls_dev/bignum_common.py
index 5319ec6..aa2cd25 100644
--- a/scripts/mbedtls_dev/bignum_common.py
+++ b/scripts/mbedtls_dev/bignum_common.py
@@ -68,7 +68,8 @@
def limbs_mpi(val: int, bits_in_limb: int) -> int:
"""Return the number of limbs required to store value."""
- return (val.bit_length() + bits_in_limb - 1) // bits_in_limb
+ bit_length = max(val.bit_length(), 1)
+ return (bit_length + bits_in_limb - 1) // bits_in_limb
def combination_pairs(values: List[T]) -> List[Tuple[T, T]]:
"""Return all pair combinations from input values."""