setup = ThresholdEncryptionSetUp(cryptosystem, len(trustees), election["trustee_threshold"])
# Add trustee commitments
for trustee in xrange(0, len(trustees)):
def to_ciphertext(idx):
ciphertext = Ciphertext(nbits, PublicKey(cryptosystem, long(trustees[idx]["public_key"]["y"])).get_fingerprint())
for i in xrange(0, len(trustees[trustee]["commitment"]["encrypted_partial_private_keys"][idx])):
ciphertext.append(long(trustees[trustee]["commitment"]["encrypted_partial_private_keys"][idx][i]["alpha"]), long(trustees[trustee]["commitment"]["encrypted_partial_private_keys"][idx][i]["beta"]))
return ciphertext
setup.add_trustee_commitment(trustee, ThresholdEncryptionCommitment(
cryptosystem, len(trustees), election["trustee_threshold"],
[long(x) for x in trustees[trustee]["commitment"]["public_coefficients"]],
[to_ciphertext(idx) for idx in range(0, len(trustees))]
))
threshold_key = setup.generate_private_key(number, secret)
print(json.dumps({
"public_key": {
"g": str(threshold_key.cryptosystem.get_generator()),
"p": str(threshold_key.cryptosystem.get_prime()),
"q": str((threshold_key.cryptosystem.get_prime() - 1) / 2),
"y": str(threshold_key.public_key._key)
},
"x": str(threshold_key._key)
}))
len(trustees[trustee]["commitment"]
["encrypted_partial_private_keys"][idx])):
ciphertext.append(
long(trustees[trustee]["commitment"]
["encrypted_partial_private_keys"][idx][i]["alpha"]),
long(trustees[trustee]["commitment"]
["encrypted_partial_private_keys"][idx][i]["beta"]))
return ciphertext
setup.add_trustee_commitment(
trustee,
ThresholdEncryptionCommitment(
cryptosystem, len(trustees), election["trustee_threshold"], [
long(x)
for x in trustees[trustee]["commitment"]["public_coefficients"]
], [to_ciphertext(idx) for idx in range(0, len(trustees))]))
threshold_key = setup.generate_private_key(number, secret)
print(
json.dumps({
"public_key": {
"g": str(threshold_key.cryptosystem.get_generator()),
"p": str(threshold_key.cryptosystem.get_prime()),
"q": str((threshold_key.cryptosystem.get_prime() - 1) / 2),
"y": str(threshold_key.public_key._key)
},
"x": str(threshold_key._key)
}))
