diff options
| -rw-r--r-- | src/gsm/a5.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/src/gsm/a5.c b/src/gsm/a5.c index 36978c48..e330c759 100644 --- a/src/gsm/a5.c +++ b/src/gsm/a5.c @@ -104,9 +104,8 @@ _a5_12_parity(uint32_t x) x ^= x >> 16; x ^= x >> 8; x ^= x >> 4; - x ^= x >> 2; - x ^= x >> 1; - return x & 1; + x &= 0xf; + return (0x6996 >> x) & 1; } /*! \brief Compute majority bit from 3 taps |