In Python cryptography, how do I write unit tests?

In Python cryptography, writing unit tests is essential for ensuring the reliability and correctness of your cryptographic operations. Unit tests help verify that your cryptographic functions behave as expected, especially when it comes to encryption, decryption, and key management. Below is an example of how to write unit tests for a simple encryption and decryption function using the `cryptography` library.

import unittest from cryptography.fernet import Fernet def generate_key(): return Fernet.generate_key() def encrypt_message(message, key): fernet = Fernet(key) return fernet.encrypt(message.encode()) def decrypt_message(encrypted_message, key): fernet = Fernet(key) return fernet.decrypt(encrypted_message).decode() class TestCryptography(unittest.TestCase): def setUp(self): self.key = generate_key() def test_encryption_decryption(self): original_message = "Hello, World!" encrypted_message = encrypt_message(original_message, self.key) decrypted_message = decrypt_message(encrypted_message, self.key) self.assertEqual(original_message, decrypted_message) def test_different_keys(self): different_key = generate_key() original_message = "Test message" encrypted_message = encrypt_message(original_message, self.key) with self.assertRaises(Exception): decrypt_message(encrypted_message, different_key) if __name__ == "__main__": unittest.main()

Python cryptography unit tests encryption decryption Fernet

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