def _blind_raw_id_batch(raw_id_batch, e, n):
hashed_ids = PsiRsaSigner._crypto_hash_list(
raw_id_batch.raw_ids, True
)
blind_numbers = [random.SystemRandom().getrandbits(256)
for i in range(len(raw_id_batch))]
byte_len = n.bit_length() // 8
blinded_hashed_ids = [int2bytes((powmod(r, e, n) * x % n).digits(),
byte_len)
for x, r in zip(hashed_ids, blind_numbers)]
return (blinded_hashed_ids, blind_numbers)
def _psi_sign_impl(items, d, n):
byte_len = n.bit_length() // 8
return [
int2bytes(powmod(bytes2int(item), d, n).digits(), byte_len)
for item in items
]