def encrypt_cbc(aes_key, content):
    iv = os.urandom(16)
    padder = PKCS7(AES.block_size).padder()
    padded_result = padder.update(content) + padder.finalize()
    aescbc = Cipher(AES(aes_key), CBC(iv)).encryptor()
    result = aescbc.update(padded_result) + aescbc.finalize()
    return result, iv