# We need a ThresholdPublicKey
tesu = ThresholdEncryptionSetUp(cryptosystem, len(trustees), trusteeThreshold)
for trustee in xrange(0, len(trustees)):
commitment = trustees[trustee]['commitment']
def to_ciphertext(idx):
ciphertext = Ciphertext(nbits, trustees[idx]['public_key_hash'])
for i in xrange(0, len(commitment['encrypted_partial_private_keys'][idx])):
ciphertext.append(long(commitment['encrypted_partial_private_keys'][idx][i]['alpha']), long(commitment['encrypted_partial_private_keys'][idx][i]['beta']))
return ciphertext
tesu.add_trustee_commitment(trustee, ThresholdEncryptionCommitment(
cryptosystem, len(trustees), trusteeThreshold,
[long(x) for x in commitment['public_coefficients']],
[to_ciphertext(x) for x in xrange(0, len(commitment['encrypted_partial_private_keys']))]
))
tpk = tesu.generate_public_key()
for q in xrange(0, numQuestions):
ballots = mixnets[0][0][q]["answers"]
for i in xrange(0, len(ballots)):
print("Verifying decryptions for question " + str(q) + " ballot " + str(i))
ballot = ballots[i]
result = long(results[q][i])
ciphertext = Ciphertext(cryptosystem.get_nbits(), tpk.get_fingerprint())
ciphertext.append(long(ballot["choice"]["alpha"]), long(ballot["choice"]["beta"]))
combinator = ThresholdDecryptionCombinator(tpk, ciphertext, len(trustees), trusteeThreshold)
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)
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)
}))
# We need a ThresholdPublicKey
tesu = ThresholdEncryptionSetUp(cryptosystem, len(trustees), trusteeThreshold)
for trustee in xrange(0, len(trustees)):
commitment = trustees[trustee]['commitment']
def to_ciphertext(idx):
ciphertext = Ciphertext(nbits, trustees[idx]['public_key_hash'])
for i in xrange(0, len(commitment['encrypted_partial_private_keys'][idx])):
ciphertext.append(long(commitment['encrypted_partial_private_keys'][idx][i]['alpha']), long(commitment['encrypted_partial_private_keys'][idx][i]['beta']))
return ciphertext
tesu.add_trustee_commitment(trustee, ThresholdEncryptionCommitment(
cryptosystem, len(trustees), trusteeThreshold,
[long(x) for x in commitment['public_coefficients']],
[to_ciphertext(x) for x in xrange(0, len(commitment['encrypted_partial_private_keys']))]
))
tpk = tesu.generate_public_key()
for q in xrange(0, numQuestions):
with statusCheck("Verifying decryptions for question " + str(q)) as sc:
ballots = mixnets[0][0][q]["answers"]
for i in xrange(0, len(ballots)):
with statusCheck("Verifying decryptions for question " + str(q) + " ballot " + str(i), sc) as sc2:
ballot = ballots[i]
result = long(results[q][i])
ciphertext = Ciphertext(cryptosystem.get_nbits(), tpk.get_fingerprint())
ciphertext.append(long(ballot["choice"]["alpha"]), long(ballot["choice"]["beta"]))
combinator = ThresholdDecryptionCombinator(tpk, ciphertext, len(trustees), trusteeThreshold)
