api.py 文件源码

def ecies_rekey(
        privkey_a: Union[bytes, elliptic_curve.ec_element],
        privkey_b: Union[bytes, elliptic_curve.ec_element],
        to_bytes: bool = True
) -> Union[bytes, umbral.RekeyFrag]:
    """
    Generates a re-encryption key from privkey_a to privkey_b.

    :param privkey_a: Private key to re-encrypt from
    :param privkey_b: Private key to re-encrypt to
    :param to_bytes: Format result as bytes?

    :return: Re-encryption key
    """
    if type(privkey_a) == bytes:
        privkey_a = priv_bytes2ec(privkey_a)
    if type(privkey_b) == bytes:
        privkey_b = priv_bytes2ec(privkey_b)

    rk = PRE.rekey(privkey_a, privkey_b)
    if to_bytes:
        return elliptic_curve.serialize(rk.key)[1:]
    return rk