def setUp(self): self.tp = ThresholdParameters(3, 5) self.kp = ThresholdCrypto.static_512_key_parameters() self.pk, self.shares = ThresholdCrypto.create_public_key_and_shares_centralized( self.kp, self.tp) self.em = ThresholdCrypto.encrypt_message('Some secret message', self.pk) self.reconstruct_shares = [self.shares[i] for i in [0, 2, 4] ] # choose 3 of 5 key shares self.partial_decryptions = [ ThresholdCrypto.compute_partial_decryption(self.em, share) for share in self.reconstruct_shares ]
def test_complete_process_with_enough_shares(self): key_params = ThresholdCrypto.static_512_key_parameters() thresh_params = ThresholdParameters(3, 5) pub_key, key_shares = ThresholdCrypto.create_public_key_and_shares_centralized( key_params, thresh_params) message = 'Some secret message to be encrypted!' encrypted_message = ThresholdCrypto.encrypt_message(message, pub_key) reconstruct_shares = [key_shares[i] for i in [0, 2, 4]] # choose 3 of 5 key shares partial_decryptions = [ ThresholdCrypto.compute_partial_decryption(encrypted_message, share) for share in reconstruct_shares ] decrypted_message = ThresholdCrypto.decrypt_message( partial_decryptions, encrypted_message, thresh_params, key_params) self.assertEqual(message, decrypted_message)
def test_message_encryption(self): em = ThresholdCrypto.encrypt_message('Some secret message', self.pk) self.assertTrue(em.c >= 0) self.assertTrue(em.v >= 0)
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)
def elgamal_enc_threshold(pk, message): encrypted = ThresholdCrypto.encrypt_message(pk, message) cipher = ThresholdCipher(encrypted.v, encrypted.c, encrypted.enc) return cipher