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fix: Fix decoding of encrypted integer above 30 bits

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This commit is contained in:
Quentin Bourgerie
2022-08-18 14:14:32 +02:00
parent 046c0ad5d9
commit f69c8dfaba
1 changed files with 5 additions and 3 deletions
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8
compiler/lib/ClientLib/KeySet.cpp
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@@ -280,10 +280,12 @@ KeySet::decrypt_lwe(size_t argPos, uint64_t *ciphertext, uint64_t &output) {
// Simple TFHE integers - 1 blocks with one padding bits
uint64_t plaintext = ::decrypt_lwe_u64(engine, lweSecretKey, ciphertext);
// Decode
size_t precision = encryption->encoding.precision;
uint64_t precision = encryption->encoding.precision;
output = plaintext >> (64 - precision - 2);
size_t carry = output % 2;
output = ((output >> 1) + carry) % (1 << (precision + 1));
auto carry = output % 2;
uint64_t mod = (((uint64_t)1) << (precision + 1));
output = ((output >> 1) + carry) % mod;
return outcome::success();
}