diff options
| -rw-r--r-- | cryptography/hazmat/primitives/padding.py | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/cryptography/hazmat/primitives/padding.py b/cryptography/hazmat/primitives/padding.py index 938afcec..8df4549e 100644 --- a/cryptography/hazmat/primitives/padding.py +++ b/cryptography/hazmat/primitives/padding.py @@ -26,11 +26,9 @@ _lib = _ffi.verify(""" #include <stdbool.h> /* Returns the value of the input with the most-significant-bit copied to all - of the bits. This relies on implementation details of computers with 2's - complement representations of integers, which is not required by the C - standard. */ + of the bits. */ static uint8_t Cryptography_DUPLICATE_MSB_TO_ALL(uint8_t a) { - return (uint8_t)((int8_t)(a) >> (sizeof(int8_t) * 8 - 1)); + return -(a >> (sizeof(uint8_t) * 8 - 1)); } /* This returns 0xFF if a < b else 0x00, but does so in a constant time |