def test_paillier(self):
p = 293
q = 433
g = 6497955158
mu = 53022
n = p*q
lmb = 31536 # lcm(p-1, q-1)
key = paillier.Key(n, g, lmb, mu)
public = key.public()
# test private key encrypt(decrypt(x)) == x
ptxt_original = 521
ctxt = paillier.encrypt(key, ptxt_original)
ptxt = paillier.decrypt(key, ctxt)
self.assertEqual(ptxt_original, ptxt)
# test public key encrypt(decrypt(x)) == x
ctxt = paillier.encrypt(public, ptxt_original)
ptxt = paillier.decrypt(key, ctxt)
self.assertEqual(ptxt_original, ptxt)
# test homomorphism
ptxt1 = 14
ptxt2 = 19
ctxt1 = paillier.encrypt(public, ptxt1)
ctxt2 = paillier.encrypt(public, ptxt2)
final_ptxt = paillier.decrypt(key, ctxt1 * ctxt2)
self.assertEqual(final_ptxt, ptxt1 + ptxt2)
def test_paillier_key_generation(self):
key = paillier.generate_keys(bits = 128)
public = key.public()
ptxt_original = 521
ctxt = paillier.encrypt(public, ptxt_original)
ptxt = paillier.decrypt(key, ctxt)
self.assertEqual(ptxt_original, ptxt)
# test homomorphism
ptxt1 = 14
ptxt2 = 19
ctxt1 = paillier.encrypt(public, ptxt1)
ctxt2 = paillier.encrypt(public, ptxt2)
final_ptxt = paillier.decrypt(key, ctxt1 * ctxt2)
self.assertEqual(final_ptxt, ptxt1 + ptxt2)
# test average
ptxt3 = 12
ctxt3 = paillier.encrypt(public, ptxt3)
ciphertext = [ctxt1, ctxt2, ctxt3]
numerator, denominator = paillier.average(public, ciphertext)
numerator = paillier.decrypt(key, numerator)
denominator = paillier.decrypt(key, denominator)
average = numerator/denominator
self.assertAlmostEqual(average, 15)
def paillier_decrypt(self, ctxt):
"""Decrypt a number using homomorphic methods."""
try:
ctxt = int(ctxt)
except ValueError:
raise EDBError("can only homomorphic decrypt integers")
return paillier.decrypt(self.keys['paillier'], ctxt)
def paillier_decrypt(self, ctxt):
"""Decrypt a number using homomorphic methods."""
try:
ctxt = int(ctxt)
except ValueError:
raise EDBError("can only homomorphic decrypt integers")
return paillier.decrypt(self.keys['paillier'], ctxt)
