First partially working implementation

ssb/tests/test_feed.py

@@ -0,0 +1,48 @@
+from base64 import b64decode
+from collections import OrderedDict
+
+import pytest
+
+from ssb.keys import KeyPair, Message
+
+
+@pytest.fixture()
+def keypair():
+    secret = b64decode('Mz2qkNOP2K6upnqibWrR+z8pVUI1ReA1MLc7QMtF2qQ=')
+    return KeyPair(secret)
+
+
+def test_keypair():
+    secret = b64decode('Mz2qkNOP2K6upnqibWrR+z8pVUI1ReA1MLc7QMtF2qQ=')
+    kp = KeyPair(secret)
+    assert bytes(kp.private_key) == secret
+    assert bytes(kp.public_key) == b64decode('I/4cyN/jPBbDsikbHzAEvmaYlaJK33lW3UhWjNXjyrU=')
+    assert kp.tag == '@I/4cyN/jPBbDsikbHzAEvmaYlaJK33lW3UhWjNXjyrU=.ed25519'
+
+
+def test_message(keypair):
+    m1 = Message(keypair, OrderedDict([
+        ('type', 'about'),
+        ('about', keypair.tag),
+        ('name', 'neo'),
+        ('description', 'The Chosen One')
+    ]), timestamp=1495706260190)
+    assert m1.timestamp == 1495706260190
+    assert m1.previous is None
+    assert m1.sequence == 1
+    assert m1.signature == \
+        'lPsQ9P10OgeyH6u0unFgiI2wV/RQ7Q2x2ebxnXYCzsJ055TBMXphRADTKhOMS2EkUxXQ9k3amj5fnWPudGxwBQ==.sig.ed25519'
+    assert m1.key == '%xRDqws/TrQmOd4aEwZ32jdLhP873ZKjIgHlggPR0eoo=.sha256'
+
+    m2 = Message(keypair, OrderedDict([
+        ('type', 'about'),
+        ('about', keypair.tag),
+        ('name', 'morpheus'),
+        ('description', 'Dude with big jaw')
+    ]), previous=m1, timestamp=1495706447426)
+    assert m2.timestamp == 1495706447426
+    assert m2.previous is m1
+    assert m2.sequence == 2
+    assert m2.signature == \
+        '3SY85LX6/ppOfP4SbfwZbKfd6DccbLRiB13pwpzbSK0nU52OEJxOqcJ2Uensr6RkrWztWLIq90sNOn1zRAoOAw==.sig.ed25519'
+    assert m2.key == '%nx13uks5GUwuKJC49PfYGMS/1pgGTtwwdWT7kbVaroM=.sha256'

ssb/tests/test_shs.py

@@ -0,0 +1,17 @@
+import hashlib
+
+import pytest
+from nacl.public import PrivateKey
+
+from ssb.shs import SecretHandShake
+
+
+@pytest.fixture()
+def appkey():
+    return hashlib.sha256(b'app_key').digest()
+
+
+def test_client_challenge(appkey):
+    pk = PrivateKey.generate()
+    shs = SecretHandShake(pk, application_key=appkey)
+    assert shs.client_challenge