from cryptography.hazmat.primitives.ciphers.aead import ChaCha20Poly1305
from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives import padding
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hmac
from cryptography.hazmat.primitives.hashes import SHA256
import pyaudio
import wave
import os
from pydub import AudioSegment

# Generate a random encryption key
password = b"encryption password"
salt = b"salt"
iterations = 100000

backend = default_backend()
kdf = PBKDF2HMAC(
    algorithm=hashes.SHA256(),
    length=32,
    salt=salt,
    iterations=iterations,
    backend=backend
)
key = kdf.derive(password)

# Create a ChaCha20Poly1305 cipher object
cipher = ChaCha20Poly1305(key)

# Set the audio parameters
FORMAT = pyaudio.paInt16
CHANNELS = 1
RATE = 44100
CHUNK = 1024

# Function to encrypt audio data
def encrypt_audio(data):
    nonce = os.urandom(16)
    encrypted_data = cipher.encrypt(nonce, data, None)
    return nonce + encrypted_data

# Function to decrypt audio data
def decrypt_audio(data):
    nonce = data[:16]
    encrypted_data = data[16:]
    decrypted_data = cipher.decrypt(nonce, encrypted_data, None)
    return decrypted_data

# Read the audio file
input_file = 'input.wav'
audio_segment = AudioSegment.from_wav(input_file)
audio_data = audio_segment.raw_data

# Apply the audio codec
# codec_data = ...

# Encrypt the codec data
encrypted_data = encrypt_audio(codec_data)

# Decrypt the encrypted data
decrypted_data = decrypt_audio(encrypted_data)

# Decode the decrypted data from the codec
# decoded_data = ...

# Save the decoded data as an audio file
output_file = 'output.wav'
output_segment = AudioSegment(decoded_data, frame_rate=RATE, sample_width=2, channels=1)
output_segment.export(output_file, format='wav')

print("Encryption and decryption completed successfully.")