nbits = ((int(math.log(long(trustees[0]["public_key"]["p"]), 2)) - 1)
& ~255) + 256
cryptosystem = EGCryptoSystem.load(
nbits, long(trustees[0]["public_key"]["p"]),
int(trustees[0]["public_key"]
["g"])) # The generator might be a long if it's big? I don't know.
setup = ThresholdEncryptionSetUp(cryptosystem, len(trustees),
election["trustee_threshold"])
# Add trustee public keys
for i in xrange(0, len(trustees)):
pk = PublicKey(cryptosystem, long(trustees[i]["public_key"]["y"]))
setup.add_trustee_public_key(i, pk)
commitment = setup.generate_commitment()
print(
json.dumps({
"public_coefficients":
[str(x) for x in commitment.public_coefficients],
"encrypted_partial_private_keys": [
# The partial private key is too big for one single (a, b) pair
[{
"alpha": str(x.gamma[i]),
"beta": str(x.delta[i])
} for i in xrange(0, x.get_length())]
for x in commitment.encrypted_partial_private_keys
]
}))
electionIn = sys.argv[1]
trusteesIn = sys.argv[2]
with open(electionIn, 'r') as electionFile:
election = json.load(electionFile)
with open(trusteesIn, 'r') as trusteesFile:
trustees = json.load(trusteesFile)
nbits = ((int(math.log(long(trustees[0]["public_key"]["p"]), 2)) - 1) & ~255) + 256
cryptosystem = EGCryptoSystem.load(nbits, long(trustees[0]["public_key"]["p"]), int(trustees[0]["public_key"]["g"])) # The generator might be a long if it's big? I don't know.
setup = ThresholdEncryptionSetUp(cryptosystem, len(trustees), election["trustee_threshold"])
# Add trustee public keys
for i in xrange(0, len(trustees)):
pk = PublicKey(cryptosystem, long(trustees[i]["public_key"]["y"]))
setup.add_trustee_public_key(i, pk)
commitment = setup.generate_commitment()
print(json.dumps({
"public_coefficients": [str(x) for x in commitment.public_coefficients],
"encrypted_partial_private_keys": [
# The partial private key is too big for one single (a, b) pair
[{"alpha": str(x.gamma[i]), "beta": str(x.delta[i])} for i in xrange(0, x.get_length())]
for x in commitment.encrypted_partial_private_keys
]
}))
