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Minimal working crypto example with Diffie-Helman
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| from cryptography.hazmat.backends import default_backend | |
| from cryptography.hazmat.primitives import hashes | |
| from cryptography.hazmat.primitives.asymmetric.x25519 import X25519PrivateKey | |
| from cryptography.hazmat.primitives.kdf.hkdf import HKDF | |
| from cryptography.hazmat.primitives.padding import PKCS7 | |
| from cryptography.hazmat.primitives.ciphers import Cipher, modes, algorithms | |
| import os | |
| private_key = X25519PrivateKey.generate() | |
| peer_public_key = X25519PrivateKey.generate().public_key() | |
| shared_key = private_key.exchange(peer_public_key) | |
| print(len(shared_key)) | |
| backend = default_backend() | |
| iv = os.urandom(16) | |
| cipher = Cipher(algorithms.AES(shared_key), modes.CBC(iv), backend=backend) | |
| encryptor = cipher.encryptor() | |
| padder = PKCS7(256).padder() | |
| ct = encryptor.update(padder.update(b'hello') + padder.finalize()) + encryptor.finalize() | |
| print(ct) |
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