added some tests

tests/test_crypto.py

@@ -0,0 +1,118 @@
+from cryptography.hazmat.backends import default_backend
+from cryptography.hazmat.primitives.asymmetric import rsa, padding
+from cryptography.hazmat.primitives import serialization, hashes
+
+import base64
+
+import unittest
+
+
+# Maybe this could be used to encrypt the secret messages in the board? 
+# https://cryptography.io/en/latest/hazmat/primitives/asymmetric/rsa/
+
+MESSAGE=b"Something secret"
+
+PEM_PASSWORD=b'aVerySecretPassword'
+
+PEM_PRIVATE_KEY=b"""-----BEGIN ENCRYPTED PRIVATE KEY-----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+-----END ENCRYPTED PRIVATE KEY-----"""
+
+ENCRYPTED_MESSAGE=('KA6I/Hu3sUWtPIvqmWEUHctAtDwWm7ZSg1GhTOwZMOgZhxi+WobWX+Q+J4Mym9zW9CwKZnILBi9tP'
+        '+fXkionJC3U4A7APl6MPjtbkSPTqB6BXPug57dOVH2bKoyGCOkb1Y7GGs/wIVCebDyRH8katXP99q80y8Mr7wzw'
+        '+xL7dNcn01Ho6xYZQlbakqJOl2UCorFGReOryGgNfhYxnHWmSDkQDtFBsB/RnexqftYLVrnPiStwALsoO8eYLsI'
+        '1wnI1kmr5acbAFcW1G/0x4EZ/iouVu0EYisgQ8GXcwoed3wgQhUdrFAmI6DcbElza6QveNXCSsIIwjLWpzI2NrwPjYg==')
+
+DEFAULT_PADDING=padding.OAEP(
+    mgf=padding.MGF1(algorithm=hashes.SHA256()),
+    algorithm=hashes.SHA256(),
+    label=None
+)
+
+
+class TestEncryption(unittest.TestCase):
+
+    def test_encryption_decryption(self):
+        private_key = rsa.generate_private_key(
+            public_exponent=65537,
+            key_size=2048,
+            backend=default_backend()
+        )
+        ciphertext = private_key.public_key().encrypt(
+            MESSAGE,
+            DEFAULT_PADDING
+        )
+        plaintext = private_key.decrypt(
+            ciphertext,
+            DEFAULT_PADDING
+        )
+        self.assertEqual(plaintext, MESSAGE)
+
+    def test_generate_private_key(self):
+        private_key = rsa.generate_private_key(
+            public_exponent=65537,
+            key_size=2048,
+            backend=default_backend()
+        )
+
+        private_pem = private_key.private_bytes(
+            encoding=serialization.Encoding.PEM,
+            format=serialization.PrivateFormat.PKCS8,
+            encryption_algorithm=serialization.BestAvailableEncryption(PEM_PASSWORD)
+        )
+        # print(private_pem.decode())
+
+    def test_encryption(self):
+        private_key=serialization.load_pem_private_key(
+            PEM_PRIVATE_KEY,
+            password=PEM_PASSWORD,
+            backend=default_backend()
+        )
+        ciphertext = private_key.public_key().encrypt(MESSAGE, DEFAULT_PADDING)
+        encoded_cipher = base64.b64encode(ciphertext)
+        # print(encoded_cipher)
+        # print(encoded_cipher.decode())
+
+    def test_decryption(self):
+        private_key = serialization.load_pem_private_key(
+            PEM_PRIVATE_KEY,
+            password=PEM_PASSWORD,
+            backend=default_backend()
+        )
+        plaintext = private_key.decrypt(
+            base64.b64decode(ENCRYPTED_MESSAGE.encode("utf-8")),
+            DEFAULT_PADDING
+        )
+        #print(plaintext)
+        self.assertEqual(MESSAGE, plaintext)
+
+if __name__ == '__main__':
+    unittest.main()
+