diff options
| -rw-r--r-- | src/aead/gcm/gcm.cpp | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/src/aead/gcm/gcm.cpp b/src/aead/gcm/gcm.cpp index 7563fc924..7b04f6f48 100644 --- a/src/aead/gcm/gcm.cpp +++ b/src/aead/gcm/gcm.cpp @@ -31,11 +31,11 @@ gcm_multiply(const secure_vector<byte>& x, for(size_t i = 0; i != 2; ++i) { - u64bit X = load_be<u64bit>(&x[0], i); + const u64bit X = load_be<u64bit>(&x[0], i); for(size_t j = 0; j != 64; ++j) { - if(X >> 63) + if((X >> (63-j)) & 1) { Z[0] ^= V[0]; Z[1] ^= V[1]; @@ -45,8 +45,6 @@ gcm_multiply(const secure_vector<byte>& x, V[1] = (V[0] << 63) | (V[1] >> 1); V[0] = (V[0] >> 1) ^ r; - - X <<= 1; } } |