// chain33-pre节点
static RpcClient[]  preClient = new RpcClient[]{
        new RpcClient("http://127.0.0.1:11801"),
        new RpcClient("http://127.0.0.1:11802"),
        new RpcClient("http://127.0.0.1:11803"),
};

// 生成对称秘钥
EncryptKey encryptKey = sdk.GenerateEncryptKey(alicePub);

// 生成重加密密钥分片
KeyFrag[] kFrags = new KeyFrag[numSplit];
try {
    kFrags = sdk.GenerateKeyFragments(alicePriv), bobPub, numSplit, threshold);
} catch (Exception e) {
    e.printStackTrace();
}

// 密钥分片发送到代理节点
String dhProof = sdk.ECDH(ServerPub, alicePriv);
for(int i = 0; i < preClient.length; i++) {
    boolean result = preClient[i].sendKeyFragment(alicePub, bobPub, encryptKey.getPubProofR(),
            encryptKey.getPubProofU(), 100, dhProof, kFrags[i]);
    if (!result) {
        System.out.println("sendKeyFragment failed");
        return;
    }
}

// 数据加密
byte[] iv = sdk.generateIv();
byte[] cipher = sdk.encrypt(content, encryptKey.getShareKey(), iv);

// 申请重加密
ReKeyFrag[] reKeyFrags = new ReKeyFrag[threshold];
for(int i = 0; i < threshold; i++) {
    reKeyFrags[i] = preClient[i].reencrypt(alicePub, bobPub);
}

// 解密对称密钥，需要被授权人私钥
byte[] shareKeyBob;
try {
    shareKeyBob = sdk.AssembleReencryptFragment(bobPriv, reKeyFrags);
} catch (Exception e) {
    e.printStackTrace();
    return;
}

// 解密
String text = AesUtil.decrypt(cipher, HexUtil.toHexString(shareKeyBob));