python: Add PK bindings.

This patch adds bindings to the PK part of the Olm library contained in
the pk.h header file.

Encryption, decryption as well as pickling/unpickling of the decryption
object is supported.

Signed-off-by: Damir Jelić <poljar@termina.org.uk>

1 files changed, 49 insertions, 0 deletions

diff --git a/python/tests/pk_test.py b/python/tests/pk_test.py
new file mode 100644
index 0000000..f2aa147
--- /dev/null
+++ b/python/tests/pk_test.py
@@ -0,0 +1,49 @@
+import pytest
+
+from olm import PkDecryption, PkDecryptionError, PkEncryption
+
+
+class TestClass(object):
+    def test_invalid_encryption(self):
+        with pytest.raises(ValueError):
+            PkEncryption("")
+
+    def test_decrytion(self):
+        decryption = PkDecryption()
+        encryption = PkEncryption(decryption.public_key)
+        plaintext = "It's a secret to everybody."
+        message = encryption.encrypt(plaintext)
+        decrypted_plaintext = decryption.decrypt(message)
+        isinstance(decrypted_plaintext, str)
+        assert plaintext == decrypted_plaintext
+
+    def test_invalid_decrytion(self):
+        decryption = PkDecryption()
+        encryption = PkEncryption(decryption.public_key)
+        plaintext = "It's a secret to everybody."
+        message = encryption.encrypt(plaintext)
+        message.ephemeral_key = "?"
+        with pytest.raises(PkDecryptionError):
+            decryption.decrypt(message)
+
+    def test_pickling(self):
+        decryption = PkDecryption()
+        encryption = PkEncryption(decryption.public_key)
+        plaintext = "It's a secret to everybody."
+        message = encryption.encrypt(plaintext)
+
+        pickle = decryption.pickle()
+        unpickled = PkDecryption.from_pickle(pickle)
+        decrypted_plaintext = unpickled.decrypt(message)
+        assert plaintext == decrypted_plaintext
+
+    def test_invalid_unpickling(self):
+        with pytest.raises(ValueError):
+            PkDecryption.from_pickle("")
+
+    def test_invalid_pass_pickling(self):
+        decryption = PkDecryption()
+        pickle = decryption.pickle("Secret")
+
+        with pytest.raises(PkDecryptionError):
+            PkDecryption.from_pickle(pickle, "Not secret")