chacha20 python

ChaCha20 is a symmetric encryption algorithm that provides both confidentiality and integrity of data. In Python, you can use the `cryptography` library to implement ChaCha20 encryption. Here's an example of how you can use it:

from cryptography.hazmat.primitives.ciphers import Cipher, algorithms
from cryptography.hazmat.primitives.ciphers.aead import ChaCha20Poly1305

# Generate a random key and nonce
key = os.urandom(32)
nonce = os.urandom(12)

# Create a ChaCha20 cipher object
cipher = Cipher(algorithms.ChaCha20(key, nonce), mode=None)

# Create an encryptor object
encryptor = cipher.encryptor()

# Encrypt the plaintext
ciphertext = encryptor.update(b"Hello, World!") + encryptor.finalize()

# Create a decryptor object
decryptor = cipher.decryptor()

# Decrypt the ciphertext
decrypted_plaintext = decryptor.update(ciphertext) + decryptor.finalize()

print(decrypted_plaintext.decode())

Make sure you have the `cryptography` library installed before running this code. You can install it using `pip install cryptography`.