def test_static_2048key_parameters(self):
kp = ThresholdCrypto.static_2048_key_parameters()
self.assertEqual(kp.p, 2 * kp.q + 1) # safe prime
self.assertEqual(pow(kp.g, kp.q, kp.p),
1) # g generates q order subgroup
self.assertNotEqual(pow(kp.g, 2, kp.p), 1)
from threshold_crypto import (ThresholdCrypto, ThresholdParameters)
# Generate parameters, public key and shares
key_params = ThresholdCrypto.static_2048_key_parameters()
thresh_params = ThresholdParameters(3, 5)
pub_key, key_shares = ThresholdCrypto.create_public_key_and_shares_centralized(
key_params, thresh_params)
# encrypt message using the public key
message = 'Some secret message to be encrypted!'
encrypted_message = ThresholdCrypto.encrypt_message(message, pub_key)
# build partial decryptions of three share owners using their shares
reconstruct_shares = [key_shares[i] for i in [0, 2, 4]]
partial_decryptions = [
ThresholdCrypto.compute_partial_decryption(encrypted_message, share)
for share in reconstruct_shares
]
# combine these partial decryptions to recover the message
decrypted_message = ThresholdCrypto.decrypt_message(partial_decryptions,
encrypted_message,
thresh_params, key_params)
print(decrypted_message)