1 files changed, 143 insertions, 0 deletions
diff --git a/tests/crypt/test_es256.py b/tests/crypt/test_es256.py
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+++ b/tests/crypt/test_es256.py
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+# Copyright 2016 Google Inc.
+#
+# 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.
+
+import base64
+import json
+import os
+
+from cryptography.hazmat.primitives.asymmetric import ec
+import pytest
+
+from google.auth import _helpers
+from google.auth.crypt import base
+from google.auth.crypt import es256
+
+
+DATA_DIR = os.path.join(os.path.dirname(__file__), "..", "data")
+
+# To generate es256_privatekey.pem, es256_privatekey.pub, and
+# es256_public_cert.pem:
+#   $ openssl ecparam -genkey -name prime256v1 -noout -out es256_privatekey.pem
+#   $ openssl ec -in es256-private-key.pem -pubout -out es256-publickey.pem
+#   $ openssl req -new -x509 -key es256_privatekey.pem -out \
+#   >     es256_public_cert.pem
+
+with open(os.path.join(DATA_DIR, "es256_privatekey.pem"), "rb") as fh:
+    PRIVATE_KEY_BYTES = fh.read()
+    PKCS1_KEY_BYTES = PRIVATE_KEY_BYTES
+
+with open(os.path.join(DATA_DIR, "es256_publickey.pem"), "rb") as fh:
+    PUBLIC_KEY_BYTES = fh.read()
+
+with open(os.path.join(DATA_DIR, "es256_public_cert.pem"), "rb") as fh:
+    PUBLIC_CERT_BYTES = fh.read()
+
+SERVICE_ACCOUNT_JSON_FILE = os.path.join(DATA_DIR, "es256_service_account.json")
+
+with open(SERVICE_ACCOUNT_JSON_FILE, "r") as fh:
+    SERVICE_ACCOUNT_INFO = json.load(fh)
+
+
+class TestES256Verifier(object):
+    def test_verify_success(self):
+        to_sign = b"foo"
+        signer = es256.ES256Signer.from_string(PRIVATE_KEY_BYTES)
+        actual_signature = signer.sign(to_sign)
+
+        verifier = es256.ES256Verifier.from_string(PUBLIC_KEY_BYTES)
+        assert verifier.verify(to_sign, actual_signature)
+
+    def test_verify_unicode_success(self):
+        to_sign = u"foo"
+        signer = es256.ES256Signer.from_string(PRIVATE_KEY_BYTES)
+        actual_signature = signer.sign(to_sign)
+
+        verifier = es256.ES256Verifier.from_string(PUBLIC_KEY_BYTES)
+        assert verifier.verify(to_sign, actual_signature)
+
+    def test_verify_failure(self):
+        verifier = es256.ES256Verifier.from_string(PUBLIC_KEY_BYTES)
+        bad_signature1 = b""
+        assert not verifier.verify(b"foo", bad_signature1)
+        bad_signature2 = b"a"
+        assert not verifier.verify(b"foo", bad_signature2)
+
+    def test_verify_failure_with_wrong_raw_signature(self):
+        to_sign = b"foo"
+
+        # This signature has a wrong "r" value in the "(r,s)" raw signature.
+        wrong_signature = base64.urlsafe_b64decode(
+            b"m7oaRxUDeYqjZ8qiMwo0PZLTMZWKJLFQREpqce1StMIa_yXQQ-C5WgeIRHW7OqlYSDL0XbUrj_uAw9i-QhfOJQ=="
+        )
+
+        verifier = es256.ES256Verifier.from_string(PUBLIC_KEY_BYTES)
+        assert not verifier.verify(to_sign, wrong_signature)
+
+    def test_from_string_pub_key(self):
+        verifier = es256.ES256Verifier.from_string(PUBLIC_KEY_BYTES)
+        assert isinstance(verifier, es256.ES256Verifier)
+        assert isinstance(verifier._pubkey, ec.EllipticCurvePublicKey)
+
+    def test_from_string_pub_key_unicode(self):
+        public_key = _helpers.from_bytes(PUBLIC_KEY_BYTES)
+        verifier = es256.ES256Verifier.from_string(public_key)
+        assert isinstance(verifier, es256.ES256Verifier)
+        assert isinstance(verifier._pubkey, ec.EllipticCurvePublicKey)
+
+    def test_from_string_pub_cert(self):
+        verifier = es256.ES256Verifier.from_string(PUBLIC_CERT_BYTES)
+        assert isinstance(verifier, es256.ES256Verifier)
+        assert isinstance(verifier._pubkey, ec.EllipticCurvePublicKey)
+
+    def test_from_string_pub_cert_unicode(self):
+        public_cert = _helpers.from_bytes(PUBLIC_CERT_BYTES)
+        verifier = es256.ES256Verifier.from_string(public_cert)
+        assert isinstance(verifier, es256.ES256Verifier)
+        assert isinstance(verifier._pubkey, ec.EllipticCurvePublicKey)
+
+
+class TestES256Signer(object):
+    def test_from_string_pkcs1(self):
+        signer = es256.ES256Signer.from_string(PKCS1_KEY_BYTES)
+        assert isinstance(signer, es256.ES256Signer)
+        assert isinstance(signer._key, ec.EllipticCurvePrivateKey)
+
+    def test_from_string_pkcs1_unicode(self):
+        key_bytes = _helpers.from_bytes(PKCS1_KEY_BYTES)
+        signer = es256.ES256Signer.from_string(key_bytes)
+        assert isinstance(signer, es256.ES256Signer)
+        assert isinstance(signer._key, ec.EllipticCurvePrivateKey)
+
+    def test_from_string_bogus_key(self):
+        key_bytes = "bogus-key"
+        with pytest.raises(ValueError):
+            es256.ES256Signer.from_string(key_bytes)
+
+    def test_from_service_account_info(self):
+        signer = es256.ES256Signer.from_service_account_info(SERVICE_ACCOUNT_INFO)
+
+        assert signer.key_id == SERVICE_ACCOUNT_INFO[base._JSON_FILE_PRIVATE_KEY_ID]
+        assert isinstance(signer._key, ec.EllipticCurvePrivateKey)
+
+    def test_from_service_account_info_missing_key(self):
+        with pytest.raises(ValueError) as excinfo:
+            es256.ES256Signer.from_service_account_info({})
+
+        assert excinfo.match(base._JSON_FILE_PRIVATE_KEY)
+
+    def test_from_service_account_file(self):
+        signer = es256.ES256Signer.from_service_account_file(SERVICE_ACCOUNT_JSON_FILE)
+
+        assert signer.key_id == SERVICE_ACCOUNT_INFO[base._JSON_FILE_PRIVATE_KEY_ID]
+        assert isinstance(signer._key, ec.EllipticCurvePrivateKey)