Python でパスワードを使用して文字列を安全に暗号化し、難読化する方法

<code class="python">from cryptography.fernet import Fernet

key = Fernet.generate_key()  # Store this securely</code>

<code class="python">from cryptography.fernet import Fernet

def encrypt(message: bytes, key: bytes) -> bytes:
    return Fernet(key).encrypt(message)</code>

<code class="python">from cryptography.fernet import Fernet

def decrypt(token: bytes, key: bytes) -> bytes:
    return Fernet(key).decrypt(token)</code>

<code class="python">message = "John Doe"
encrypted_token = encrypt(message.encode(), key)
decrypted_message = decrypt(encrypted_token, key).decode()

print(decrypted_message)  # Output: John Doe</code>

<code class="python">import base64

def obscure(data: bytes) -> bytes:
    return base64.b64encode(data)

def unobscure(obscured: bytes) -> bytes:
    return base64.b64decode(obscured)</code>

<code class="python">data = b"Hello world!"
obscured = obscure(data)
unobscured = unobscure(obscured)

print(unobscured.decode())  # Output: Hello world!</code>

<code class="python">import hmac
import hashlib

def sign(data: bytes, key: bytes) -> bytes:
    return hmac.new(key, data, hashlib.sha256).digest()

def verify(signature: bytes, data: bytes, key: bytes) -> bool:
    return hmac.compare_digest(hmac.new(key, data, hashlib.sha256).digest(), signature)</code>

<code class="python">data = b"Hello world!"
key = secrets.token_bytes(32)
signature = sign(data, key)

if verify(signature, data, key):
    print("Signature is valid")
else:
    print("Signature is invalid")</code>