Add public private and evalkey serialization tests

tests/test_serial_cc.py

@@ -48,16 +48,26 @@ def test_serial_cryptocontext_str(mode):
 
     cryptoContext = fhe.GenCryptoContext(parameters)
     cryptoContext.Enable(fhe.PKESchemeFeature.PKE)
+    cryptoContext.Enable(fhe.PKESchemeFeature.PRE)
 
     keypair = cryptoContext.KeyGen()
     vectorOfInts = list(range(12))
     plaintext = cryptoContext.MakePackedPlaintext(vectorOfInts)
     ciphertext = cryptoContext.Encrypt(keypair.publicKey, plaintext)
+    evalKey = cryptoContext.ReKeyGen(keypair.secretKey, keypair.publicKey)
+
 
     cryptoContext_ser = fhe.Serialize(cryptoContext, mode)
     LOGGER.debug("The cryptocontext has been serialized.")
+    publickey_ser = fhe.Serialize(keypair.publicKey, mode)
+    LOGGER.debug("The public key has been serialized.")
+    secretkey_ser = fhe.Serialize(keypair.secretKey, mode)
+    LOGGER.debug("The private key has been serialized.")
     ciphertext_ser = fhe.Serialize(ciphertext, mode)
     LOGGER.debug("The ciphertext has been serialized.")
+    evalKey_ser = fhe.Serialize(evalKey, mode)
+    LOGGER.debug("The evaluation key has been serialized.")
+
 
     cryptoContext.ClearEvalMultKeys()
     cryptoContext.ClearEvalAutomorphismKeys()
@@ -67,6 +77,18 @@ def test_serial_cryptocontext_str(mode):
     assert isinstance(cc, fhe.CryptoContext)
     LOGGER.debug("The cryptocontext has been deserialized.")
 
+    pk = fhe.DeserializePublicKeyString(publickey_ser, mode)
+    assert isinstance(pk, fhe.PublicKey)
+    LOGGER.debug("The public key has been deserialized.")
+
+    sk = fhe.DeserializePrivateKeyString(secretkey_ser, mode)
+    assert isinstance(sk, fhe.PrivateKey)
+    LOGGER.debug("The private key has been deserialized.")
+
     ct = fhe.DeserializeCiphertextString(ciphertext_ser, mode)
     assert isinstance(ct, fhe.Ciphertext)
     LOGGER.debug("The ciphertext has been reserialized.")
+
+    ek = fhe.DeserializeEvalKeyString(evalKey_ser, mode)
+    assert isinstance(ek, fhe.EvalKey)
+    LOGGER.debug("The evaluation key has been deserialized.")