Refs pyca#3331 -- integrated wycheproof ECDSA tests (pyca#4341)

* Refs pyca#3331 -- integrated wycheproof ECDSA tests

* Also handle these key loading errors

* review

* empty commit to trigger jenkins

tests/wycheproof/test_ecdsa.py

@@ -0,0 +1,76 @@
+# This file is dual licensed under the terms of the Apache License, Version
+# 2.0, and the BSD License. See the LICENSE file in the root of this repository
+# for complete details.
+
+from __future__ import absolute_import, division, print_function
+
+import binascii
+
+import pytest
+
+from cryptography.exceptions import InvalidSignature, UnsupportedAlgorithm
+from cryptography.hazmat.backends.interfaces import EllipticCurveBackend
+from cryptography.hazmat.primitives import hashes, serialization
+from cryptography.hazmat.primitives.asymmetric import ec
+
+
+_DIGESTS = {
+    "SHA-1": hashes.SHA1(),
+    "SHA-224": hashes.SHA224(),
+    "SHA-256": hashes.SHA256(),
+    "SHA-384": hashes.SHA384(),
+    "SHA-512": hashes.SHA512(),
+}
+
+
+@pytest.mark.requires_backend_interface(interface=EllipticCurveBackend)
+@pytest.mark.wycheproof_tests(
+    "ecdsa_test.json",
+    "ecdsa_brainpoolP224r1_sha224_test.json",
+    "ecdsa_brainpoolP256r1_sha256_test.json",
+    "ecdsa_brainpoolP320r1_sha384_test.json",
+    "ecdsa_brainpoolP384r1_sha384_test.json",
+    "ecdsa_brainpoolP512r1_sha512_test.json",
+    "ecdsa_secp224r1_sha224_test.json",
+    "ecdsa_secp224r1_sha256_test.json",
+    "ecdsa_secp224r1_sha512_test.json",
+    "ecdsa_secp256k1_sha256_test.json",
+    "ecdsa_secp256k1_sha512_test.json",
+    "ecdsa_secp256r1_sha256_test.json",
+    "ecdsa_secp256r1_sha512_test.json",
+    "ecdsa_secp384r1_sha384_test.json",
+    "ecdsa_secp384r1_sha512_test.json",
+    "ecdsa_secp521r1_sha512_test.json",
+)
+def test_ecdsa_signature(backend, wycheproof):
+    try:
+        key = serialization.load_der_public_key(
+            binascii.unhexlify(wycheproof.testgroup["keyDer"]), backend
+        )
+    except (UnsupportedAlgorithm, ValueError):
+        # In OpenSSL 1.0.1, some keys fail to load with ValueError, instead of
+        # Unsupported Algorithm. We can remove handling for that exception
+        # when we drop support.
+        pytest.skip(
+            "unable to load key (curve {})".format(
+                wycheproof.testgroup["key"]["curve"]
+            )
+        )
+    digest = _DIGESTS[wycheproof.testgroup["sha"]]
+
+    if (
+        wycheproof.valid or
+        (wycheproof.acceptable and not wycheproof.has_flag("MissingZero"))
+    ):
+        key.verify(
+            binascii.unhexlify(wycheproof.testcase["sig"]),
+            binascii.unhexlify(wycheproof.testcase["msg"]),
+            ec.ECDSA(digest),
+        )
+    else:
+        with pytest.raises(InvalidSignature):
+            key.verify(
+                binascii.unhexlify(wycheproof.testcase["sig"]),
+                binascii.unhexlify(wycheproof.testcase["msg"]),
+                ec.ECDSA(digest),
+            )