diff --git a/tests/crypto/__init__.py b/tests/crypto/__init__.py
new file mode 100644
index 0000000000..9bff9ec169
--- /dev/null
+++ b/tests/crypto/__init__.py
@@ -0,0 +1,15 @@
+# -*- coding: utf-8 -*-
+# Copyright 2014 OpenMarket Ltd
+#
+# 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.
+
diff --git a/tests/crypto/test_event_signing.py b/tests/crypto/test_event_signing.py
new file mode 100644
index 0000000000..7913472941
--- /dev/null
+++ b/tests/crypto/test_event_signing.py
@@ -0,0 +1,114 @@
+# -*- coding: utf-8 -*-
+# Copyright 2015 OpenMarket Ltd
+#
+# 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.
+
+
+from tests import unittest
+
+from synapse.events.builder import EventBuilder
+from synapse.crypto.event_signing import add_hashes_and_signatures
+
+from unpaddedbase64 import decode_base64
+
+import nacl.signing
+
+
+# Perform these tests using given secret key so we get entirely deterministic
+# signatures output that we can test against.
+SIGNING_KEY_SEED = decode_base64(
+ "YJDBA9Xnr2sVqXD9Vj7XVUnmFZcZrlw8Md7kMW+3XA1"
+)
+
+KEY_ALG = "ed25519"
+KEY_VER = 1
+KEY_NAME = "%s:%d" % (KEY_ALG, KEY_VER)
+
+HOSTNAME = "domain"
+
+
+class EventSigningTestCase(unittest.TestCase):
+
+ def setUp(self):
+ self.signing_key = nacl.signing.SigningKey(SIGNING_KEY_SEED)
+ self.signing_key.alg = KEY_ALG
+ self.signing_key.version = KEY_VER
+
+ def test_sign_minimal(self):
+ builder = EventBuilder(
+ {
+ 'event_id': "$0:domain",
+ 'origin': "domain",
+ 'origin_server_ts': 1000000,
+ 'signatures': {},
+ 'type': "X",
+ 'unsigned': {'age_ts': 1000000},
+ },
+ )
+
+ add_hashes_and_signatures(builder, HOSTNAME, self.signing_key)
+
+ event = builder.build()
+
+ self.assertTrue(hasattr(event, 'hashes'))
+ self.assertIn('sha256', event.hashes)
+ self.assertEquals(
+ event.hashes['sha256'],
+ "6tJjLpXtggfke8UxFhAKg82QVkJzvKOVOOSjUDK4ZSI",
+ )
+
+ self.assertTrue(hasattr(event, 'signatures'))
+ self.assertIn(HOSTNAME, event.signatures)
+ self.assertIn(KEY_NAME, event.signatures["domain"])
+ self.assertEquals(
+ event.signatures[HOSTNAME][KEY_NAME],
+ "2Wptgo4CwmLo/Y8B8qinxApKaCkBG2fjTWB7AbP5Uy+"
+ "aIbygsSdLOFzvdDjww8zUVKCmI02eP9xtyJxc/cLiBA",
+ )
+
+ def test_sign_message(self):
+ builder = EventBuilder(
+ {
+ 'content': {
+ 'body': "Here is the message content",
+ },
+ 'event_id': "$0:domain",
+ 'origin': "domain",
+ 'origin_server_ts': 1000000,
+ 'type': "m.room.message",
+ 'room_id': "!r:domain",
+ 'sender': "@u:domain",
+ 'signatures': {},
+ 'unsigned': {'age_ts': 1000000},
+ }
+ )
+
+ add_hashes_and_signatures(builder, HOSTNAME, self.signing_key)
+
+ event = builder.build()
+
+ self.assertTrue(hasattr(event, 'hashes'))
+ self.assertIn('sha256', event.hashes)
+ self.assertEquals(
+ event.hashes['sha256'],
+ "onLKD1bGljeBWQhWZ1kaP9SorVmRQNdN5aM2JYU2n/g",
+ )
+
+ self.assertTrue(hasattr(event, 'signatures'))
+ self.assertIn(HOSTNAME, event.signatures)
+ self.assertIn(KEY_NAME, event.signatures["domain"])
+ self.assertEquals(
+ event.signatures[HOSTNAME][KEY_NAME],
+ "Wm+VzmOUOz08Ds+0NTWb1d4CZrVsJSikkeRxh6aCcUw"
+ "u6pNC78FunoD7KNWzqFn241eYHYMGCA5McEiVPdhzBA"
+ )
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