chore: add io test for crypto

Author: LVivona

binding/python/tests/crypto/test_io.py

@@ -1,3 +1,88 @@
+import pytest
+import tempfile
 
-def test_io_read_ssh_file():
-    ...
+from cryptography.hazmat.primitives.asymmetric import ed25519
+from cryptography.hazmat.primitives import serialization
+
+from synlink.crypto.io import load_open_ssh_private_key
+from synlink.crypto.ed25519 import PrivateKey
+
+
+
+def _create_tempfile(buffer : bytes) -> tempfile._TemporaryFileWrapper:
+        """create a test ssh-keygen tempory file."""
+        file = tempfile.NamedTemporaryFile()
+        try:
+            _ = file.write(buffer)
+            _ = file.flush()
+        except Exception as e:
+            file.close()
+            raise
+
+        return file
+
+
+@pytest.fixture
+def file_buffer() -> tempfile._TemporaryFileWrapper:
+    """Generate a OpenSSH key."""
+    # Generate ed25519 private key. 
+    private_key = ed25519.Ed25519PrivateKey.generate()
+    buffer = private_key.private_bytes(
+        encoding=serialization.Encoding.PEM,
+        format=serialization.PrivateFormat.OpenSSH,
+        encryption_algorithm=serialization.BestAvailableEncryption(
+            b"hello-world"
+        )
+    )
+
+    return _create_tempfile(buffer)
+
+@pytest.fixture
+def invalid_file_buffer() -> tempfile._TemporaryFileWrapper:
+    # Generate ed25519 private key. 
+    private_key = ed25519.Ed25519PrivateKey.generate()
+    buffer = private_key.private_bytes(
+        encoding=serialization.Encoding.Raw,
+        format=serialization.PrivateFormat.Raw,
+        encryption_algorithm=serialization.NoEncryption()
+    )
+
+    return _create_tempfile(buffer)
+
+
+
+def test_io_read_ssh_file(file_buffer : tempfile._TemporaryFileWrapper):
+    try:
+        _ = file_buffer
+        _keypair = load_open_ssh_private_key(
+            _.name,
+            password="hello-world"
+        )
+    # finally close the file
+    finally:
+        _.close()
+
+
+
+def test_io_invalid_read_ssh_file(invalid_file_buffer : tempfile._TemporaryFileWrapper):
+    _ = invalid_file_buffer
+    
+    with pytest.raises(Exception): 
+        _keypair = load_open_ssh_private_key(
+            _.name,
+            password="hello-world"
+        )
+
+    _.close()
+
+
+def test_io_invalid_key_read_ssh_file(file_buffer : tempfile._TemporaryFileWrapper):
+    _ = file_buffer
+    
+    with pytest.raises(Exception): 
+        _keypair = load_open_ssh_private_key(
+            _.name,
+            password="hello"
+        )
+        
+    _.close()