| # Copyright 2019 Google LLC. |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| """Tests for tink.python.cc.clif.py_key_manager.""" |
| |
| from __future__ import absolute_import |
| from __future__ import division |
| from __future__ import print_function |
| |
| from absl.testing import absltest |
| from tink.proto import aes_eax_pb2 |
| from tink.proto import aes_siv_pb2 |
| from tink.proto import common_pb2 |
| from tink.proto import ecdsa_pb2 |
| from tink.proto import ecies_aead_hkdf_pb2 |
| from tink.proto import hmac_pb2 |
| from tink.proto import tink_pb2 |
| from tink.python.aead import aead_key_templates |
| from tink.python.cc.clif import cc_key_manager |
| from tink.python.cc.clif import cc_tink_config |
| from tink.python.hybrid import hybrid_key_templates |
| from tink.util import error |
| |
| |
| def setUpModule(): |
| cc_tink_config.register() |
| |
| |
| class AeadKeyManagerTest(absltest.TestCase): |
| |
| def setUp(self): |
| super(AeadKeyManagerTest, self).setUp() |
| self.key_manager = cc_key_manager.AeadKeyManager.from_cc_registry( |
| 'type.googleapis.com/google.crypto.tink.AesEaxKey') |
| |
| def new_aes_eax_key_template(self, iv_size, key_size): |
| key_format = aes_eax_pb2.AesEaxKeyFormat() |
| key_format.params.iv_size = iv_size |
| key_format.key_size = key_size |
| key_template = tink_pb2.KeyTemplate() |
| key_template.type_url = 'type.googleapis.com/google.crypto.tink.AesEaxKey' |
| key_template.value = key_format.SerializeToString() |
| return key_template |
| |
| def test_key_type(self): |
| self.assertEqual(self.key_manager.key_type(), |
| 'type.googleapis.com/google.crypto.tink.AesEaxKey') |
| |
| def test_new_key_data(self): |
| key_template = self.new_aes_eax_key_template(12, 16) |
| key_data = self.key_manager.new_key_data(key_template) |
| self.assertEqual(key_data.type_url, self.key_manager.key_type()) |
| self.assertEqual(key_data.key_material_type, tink_pb2.KeyData.SYMMETRIC) |
| key = aes_eax_pb2.AesEaxKey() |
| key.ParseFromString(key_data.value) |
| self.assertEqual(key.version, 0) |
| self.assertEqual(key.params.iv_size, 12) |
| self.assertLen(key.key_value, 16) |
| |
| def test_invalid_params_throw_exception(self): |
| key_template = self.new_aes_eax_key_template(9, 16) |
| with self.assertRaises(error.StatusNotOk): |
| self.key_manager.new_key_data(key_template) |
| |
| def test_encrypt_decrypt(self): |
| aead = self.key_manager.primitive( |
| self.key_manager.new_key_data(self.new_aes_eax_key_template(12, 16))) |
| plaintext = b'plaintext' |
| associated_data = b'associated_data' |
| ciphertext = aead.encrypt(plaintext, associated_data) |
| self.assertEqual(aead.decrypt(ciphertext, associated_data), plaintext) |
| |
| |
| class DeterministicAeadKeyManagerTest(absltest.TestCase): |
| |
| def setUp(self): |
| super(DeterministicAeadKeyManagerTest, self).setUp() |
| daead_key_manager = cc_key_manager.DeterministicAeadKeyManager |
| self.key_manager = daead_key_manager.from_cc_registry( |
| 'type.googleapis.com/google.crypto.tink.AesSivKey') |
| |
| def new_aes_siv_key_template(self, key_size): |
| key_format = aes_siv_pb2.AesSivKeyFormat() |
| key_format.key_size = key_size |
| key_template = tink_pb2.KeyTemplate() |
| key_template.type_url = 'type.googleapis.com/google.crypto.tink.AesSivKey' |
| key_template.value = key_format.SerializeToString() |
| return key_template |
| |
| def test_key_type(self): |
| self.assertEqual(self.key_manager.key_type(), |
| 'type.googleapis.com/google.crypto.tink.AesSivKey') |
| |
| def test_new_key_data(self): |
| key_template = self.new_aes_siv_key_template(64) |
| key_data = self.key_manager.new_key_data(key_template) |
| self.assertEqual(key_data.type_url, self.key_manager.key_type()) |
| self.assertEqual(key_data.key_material_type, tink_pb2.KeyData.SYMMETRIC) |
| key = aes_siv_pb2.AesSivKey() |
| key.ParseFromString(key_data.value) |
| self.assertEqual(key.version, 0) |
| self.assertLen(key.key_value, 64) |
| |
| def test_invalid_params_throw_exception(self): |
| key_template = self.new_aes_siv_key_template(65) |
| with self.assertRaises(error.StatusNotOk): |
| self.key_manager.new_key_data(key_template) |
| |
| def test_encrypt_decrypt(self): |
| aead = self.key_manager.primitive( |
| self.key_manager.new_key_data(self.new_aes_siv_key_template(64))) |
| plaintext = b'plaintext' |
| associated_data = b'associated_data' |
| ciphertext = aead.encrypt_deterministically(plaintext, associated_data) |
| self.assertEqual( |
| aead.decrypt_deterministically(ciphertext, associated_data), plaintext) |
| |
| |
| class HybridKeyManagerTest(absltest.TestCase): |
| |
| def hybrid_decrypt_key_manager(self): |
| return cc_key_manager.HybridDecryptKeyManager.from_cc_registry( |
| 'type.googleapis.com/google.crypto.tink.EciesAeadHkdfPrivateKey') |
| |
| def hybrid_encrypt_key_manager(self): |
| return cc_key_manager.HybridEncryptKeyManager.from_cc_registry( |
| 'type.googleapis.com/google.crypto.tink.EciesAeadHkdfPublicKey') |
| |
| def test_new_key_data(self): |
| key_manager = self.hybrid_decrypt_key_manager() |
| key_data = key_manager.new_key_data( |
| hybrid_key_templates.ECIES_P256_HKDF_HMAC_SHA256_AES128_GCM) |
| self.assertEqual(key_data.type_url, key_manager.key_type()) |
| self.assertEqual(key_data.key_material_type, |
| tink_pb2.KeyData.ASYMMETRIC_PRIVATE) |
| key = ecies_aead_hkdf_pb2.EciesAeadHkdfPrivateKey() |
| key.ParseFromString(key_data.value) |
| self.assertLen(key.key_value, 32) |
| self.assertEqual(key.public_key.params.kem_params.curve_type, |
| common_pb2.NIST_P256) |
| |
| def test_new_key_data_invalid_params_throw_exception(self): |
| with self.assertRaisesRegex(error.StatusNotOk, |
| 'Unsupported elliptic curve'): |
| self.hybrid_decrypt_key_manager().new_key_data( |
| hybrid_key_templates.create_ecies_aead_hkdf_key_template( |
| curve_type=100, |
| ec_point_format=common_pb2.UNCOMPRESSED, |
| hash_type=common_pb2.SHA256, |
| dem_key_template=aead_key_templates.AES128_GCM)) |
| |
| def test_encrypt_decrypt(self): |
| decrypt_key_manager = self.hybrid_decrypt_key_manager() |
| encrypt_key_manager = self.hybrid_encrypt_key_manager() |
| key_data = decrypt_key_manager.new_key_data( |
| hybrid_key_templates.ECIES_P256_HKDF_HMAC_SHA256_AES128_GCM) |
| public_key_data = decrypt_key_manager.public_key_data(key_data) |
| hybrid_encrypt = encrypt_key_manager.primitive(public_key_data) |
| ciphertext = hybrid_encrypt.encrypt(b'some plaintext', b'some context info') |
| hybrid_decrypt = decrypt_key_manager.primitive(key_data) |
| self.assertEqual(hybrid_decrypt.decrypt(ciphertext, b'some context info'), |
| b'some plaintext') |
| |
| def test_decrypt_fails(self): |
| decrypt_key_manager = self.hybrid_decrypt_key_manager() |
| key_data = decrypt_key_manager.new_key_data( |
| hybrid_key_templates.ECIES_P256_HKDF_HMAC_SHA256_AES128_GCM) |
| hybrid_decrypt = decrypt_key_manager.primitive(key_data) |
| with self.assertRaisesRegex(error.StatusNotOk, 'ciphertext too short'): |
| hybrid_decrypt.decrypt(b'bad ciphertext', b'some context info') |
| |
| |
| class MacKeyManagerTest(absltest.TestCase): |
| |
| def setUp(self): |
| super(MacKeyManagerTest, self).setUp() |
| self.key_manager = cc_key_manager.MacKeyManager.from_cc_registry( |
| 'type.googleapis.com/google.crypto.tink.HmacKey') |
| |
| def new_hmac_key_template(self, hash_type, tag_size, key_size): |
| key_format = hmac_pb2.HmacKeyFormat() |
| key_format.params.hash = hash_type |
| key_format.params.tag_size = tag_size |
| key_format.key_size = key_size |
| key_template = tink_pb2.KeyTemplate() |
| key_template.type_url = 'type.googleapis.com/google.crypto.tink.HmacKey' |
| key_template.value = key_format.SerializeToString() |
| return key_template |
| |
| def test_key_type(self): |
| self.assertEqual(self.key_manager.key_type(), |
| 'type.googleapis.com/google.crypto.tink.HmacKey') |
| |
| def test_new_key_data(self): |
| key_template = self.new_hmac_key_template(common_pb2.SHA256, 24, 16) |
| key_data = self.key_manager.new_key_data(key_template) |
| self.assertEqual(key_data.type_url, self.key_manager.key_type()) |
| key = hmac_pb2.HmacKey() |
| key.ParseFromString(key_data.value) |
| self.assertEqual(key.version, 0) |
| self.assertEqual(key.params.hash, common_pb2.SHA256) |
| self.assertEqual(key.params.tag_size, 24) |
| self.assertLen(key.key_value, 16) |
| |
| def test_invalid_params_throw_exception(self): |
| key_template = self.new_hmac_key_template(common_pb2.SHA256, 9, 16) |
| with self.assertRaises(error.StatusNotOk): |
| self.key_manager.new_key_data(key_template) |
| |
| def test_mac_success(self): |
| mac = self.key_manager.primitive( |
| self.key_manager.new_key_data( |
| self.new_hmac_key_template(common_pb2.SHA256, 24, 16))) |
| data = b'data' |
| tag = mac.compute_mac(data) |
| self.assertLen(tag, 24) |
| # No exception raised. |
| mac.verify_mac(tag, data) |
| |
| def test_mac_wrong(self): |
| mac = self.key_manager.primitive( |
| self.key_manager.new_key_data( |
| self.new_hmac_key_template(common_pb2.SHA256, 16, 16))) |
| with self.assertRaisesRegex(error.StatusNotOk, 'verification failed'): |
| mac.verify_mac(b'0123456789ABCDEF', b'data') |
| |
| |
| class PublicKeySignVerifyKeyManagerTest(absltest.TestCase): |
| |
| def setUp(self): |
| super(PublicKeySignVerifyKeyManagerTest, self).setUp() |
| public_key_verify_manager = cc_key_manager.PublicKeyVerifyKeyManager |
| self.key_manager_verify = public_key_verify_manager.from_cc_registry( |
| 'type.googleapis.com/google.crypto.tink.EcdsaPublicKey') |
| public_key_sign_manager = cc_key_manager.PublicKeySignKeyManager |
| self.key_manager_sign = public_key_sign_manager.from_cc_registry( |
| 'type.googleapis.com/google.crypto.tink.EcdsaPrivateKey') |
| |
| def new_ecdsa_key_template(self, hash_type, curve_type, encoding, |
| public=False): |
| params = ecdsa_pb2.EcdsaParams( |
| hash_type=hash_type, curve=curve_type, encoding=encoding) |
| key_format = ecdsa_pb2.EcdsaKeyFormat(params=params) |
| key_template = tink_pb2.KeyTemplate() |
| if public: |
| append = 'EcdsaPublicKey' |
| else: |
| append = 'EcdsaPrivateKey' |
| key_template.type_url = 'type.googleapis.com/google.crypto.tink.' + append |
| |
| key_template.value = key_format.SerializeToString() |
| return key_template |
| |
| def test_key_type_sign(self): |
| self.assertEqual(self.key_manager_sign.key_type(), |
| 'type.googleapis.com/google.crypto.tink.EcdsaPrivateKey') |
| |
| def test_key_type_verify(self): |
| self.assertEqual(self.key_manager_verify.key_type(), |
| 'type.googleapis.com/google.crypto.tink.EcdsaPublicKey') |
| |
| def test_new_key_data_sign(self): |
| key_template = self.new_ecdsa_key_template( |
| common_pb2.SHA256, common_pb2.NIST_P256, ecdsa_pb2.DER) |
| key_data = self.key_manager_sign.new_key_data(key_template) |
| self.assertEqual(key_data.type_url, self.key_manager_sign.key_type()) |
| key = ecdsa_pb2.EcdsaPrivateKey() |
| key.ParseFromString(key_data.value) |
| public_key = key.public_key |
| self.assertEqual(key.version, 0) |
| self.assertEqual(public_key.version, 0) |
| self.assertEqual(public_key.params.hash_type, common_pb2.SHA256) |
| self.assertEqual(public_key.params.curve, common_pb2.NIST_P256) |
| self.assertEqual(public_key.params.encoding, ecdsa_pb2.DER) |
| self.assertLen(key.key_value, 32) |
| |
| def test_new_key_data_verify(self): |
| key_template = self.new_ecdsa_key_template( |
| common_pb2.SHA256, common_pb2.NIST_P256, ecdsa_pb2.DER, True) |
| with self.assertRaisesRegex(error.StatusNotOk, 'not supported'): |
| self.key_manager_verify.new_key_data(key_template) |
| |
| def test_signature_success(self): |
| priv_key = self.key_manager_sign.new_key_data( |
| self.new_ecdsa_key_template(common_pb2.SHA256, common_pb2.NIST_P256, |
| ecdsa_pb2.DER)) |
| pub_key = self.key_manager_sign.public_key_data(priv_key) |
| |
| verifier = self.key_manager_verify.primitive(pub_key) |
| signer = self.key_manager_sign.primitive(priv_key) |
| |
| data = b'data' |
| signature = signer.sign(data) |
| |
| # Starts with a DER sequence |
| self.assertEqual(bytearray(signature)[0], 0x30) |
| |
| verifier.verify(signature, data) |
| |
| def test_signature_fails(self): |
| key_template = self.new_ecdsa_key_template( |
| common_pb2.SHA256, common_pb2.NIST_P256, ecdsa_pb2.DER, False) |
| priv_key = self.key_manager_sign.new_key_data(key_template) |
| pub_key = self.key_manager_sign.public_key_data(priv_key) |
| |
| signer = self.key_manager_sign.primitive(priv_key) |
| verifier = self.key_manager_verify.primitive(pub_key) |
| |
| data = b'data' |
| signature = signer.sign(data) |
| |
| with self.assertRaisesRegex(error.StatusNotOk, 'Signature is not valid'): |
| verifier.verify(signature, 'wrongdata') |
| |
| with self.assertRaisesRegex(error.StatusNotOk, 'Signature is not valid'): |
| verifier.verify('wrongsignature', data) |
| |
| |
| if __name__ == '__main__': |
| absltest.main() |
