powers.py 文件源码

def decrypt(
            self,
            enc_data: Tuple[bytes, bytes],
            privkey: bytes = None
    ) -> bytes:
        """
        Decrypts data using ECIES PKE. If no `privkey` is provided, it uses
        `self.priv_key`.

        :param enc_data: Tuple: (encrypted data, ECIES encapsulated key)
        :param privkey: Private key to decapsulate with

        :return: Decrypted data
        """
        privkey = privkey or self.priv_key
        ciphertext, enc_key = enc_data

        enc_key = API.elliptic_curve.deserialize(API.PRE.ecgroup, enc_key)
        enc_key = API.umbral.EncryptedKey(ekey=enc_key, re_id=None)

        dec_key = API.ecies_decapsulate(privkey, enc_key)

        return API.symm_decrypt(dec_key, ciphertext)