消息推送系统

from Crypto.Cipher import AES

import base64

def encrypt_data(data, key):

cipher = AES.new(key, AES.MODE_EAX)

nonce = cipher.nonce

ciphertext, tag = cipher.encrypt_and_digest(data)

return base64.b64encode(nonce + ciphertext + tag).decode('utf-8')

def decrypt_data(encrypted_data, key):

encrypted_data = base64.b64decode(encrypted_data)

nonce = encrypted_data[:16]

ciphertext = encrypted_data[16:-16]

tag = encrypted_data[-16:]

cipher = AES.new(key, AES.MODE_EAX, nonce=nonce)

plaintext = cipher.decrypt(ciphertext)

try:

cipher.verify(tag)

return plaintext.decode('utf-8')

except ValueError:

print("Key incorrect or message corrupted")

return None

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