HarmonyOS SM2密钥交换计算协商密钥

这边有使用bouncycastle的SM2KeyExchange，想咨询下ArkTS实现方法。

java源码如下：

public static byte[] calculateKey(boolean initiator, int keyBits,
ECPrivateKeyParameters selfStaticPriv, ECPrivateKeyParameters selfEphemeralPriv, byte[] selfId,
ECPublicKeyParameters otherStaticPub, ECPublicKeyParameters otherEphemeralPub, byte[] otherId) {
  SM2KeyExchange exch = new SM2KeyExchange();
  exch.init(new ParametersWithID(
    new SM2KeyExchangePrivateParameters(initiator, selfStaticPriv, selfEphemeralPriv),
    selfId));
  return exch.calculateKey(
    keyBits,
    new ParametersWithID(new SM2KeyExchangePublicParameters(otherStaticPub, otherEphemeralPub), otherId));
}

参见上述java代码，入参两对公私钥加selfId\otherId，计算key。

SM2密钥交换协议参考：https://tools.ietf.org/html/draft-shen-sm2-ecdsa-02