1 files changed, 53 insertions, 0 deletions
diff --git a/test/units/ansible_test/ci/util.py b/test/units/ansible_test/ci/util.py
new file mode 100644
index 00000000..ba8e358b
--- /dev/null
+++ b/test/units/ansible_test/ci/util.py
@@ -0,0 +1,53 @@
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import base64
+import json
+import re
+
+
+def common_auth_test(auth):
+    private_key_pem = auth.initialize_private_key()
+    public_key_pem = auth.public_key_pem
+
+    extract_pem_key(private_key_pem, private=True)
+    extract_pem_key(public_key_pem, private=False)
+
+    request = dict(hello='World')
+    auth.sign_request(request)
+
+    verify_signature(request, public_key_pem)
+
+
+def extract_pem_key(value, private):
+    assert isinstance(value, type(u''))
+
+    key_type = '(EC )?PRIVATE' if private else 'PUBLIC'
+    pattern = r'^-----BEGIN ' + key_type + r' KEY-----\n(?P<key>.*?)\n-----END ' + key_type + r' KEY-----\n$'
+    match = re.search(pattern, value, flags=re.DOTALL)
+
+    assert match, 'key "%s" does not match pattern "%s"' % (value, pattern)
+
+    base64.b64decode(match.group('key'))  # make sure the key can be decoded
+
+
+def verify_signature(request, public_key_pem):
+    signature = request.pop('signature')
+    payload_bytes = json.dumps(request, sort_keys=True).encode()
+
+    assert isinstance(signature, type(u''))
+
+    from cryptography.hazmat.backends import default_backend
+    from cryptography.hazmat.primitives import hashes
+    from cryptography.hazmat.primitives.asymmetric import ec
+    from cryptography.hazmat.primitives.serialization import load_pem_public_key
+
+    public_key = load_pem_public_key(public_key_pem.encode(), default_backend())
+
+    verifier = public_key.verifier(
+        base64.b64decode(signature.encode()),
+        ec.ECDSA(hashes.SHA256()),
+    )
+
+    verifier.update(payload_bytes)
+    verifier.verify()