def decrypt_RSA(key, package):
    """
    Decrypt RSA encrypted package with private key
    :param key: Private key
    :param package: Base64 encoded string to decrypt
    :return: String decrypted
    """
    from Crypto.PublicKey import RSA
    from Crypto.Cipher import PKCS1_OAEP
    from base64 import b64decode
    rsakey = RSA.importKey(key)
    rsakey = PKCS1_OAEP.new(rsakey)
    decrypted = rsakey.decrypt(b64decode(package))
    return decrypted.decode('unicode_escape')
