{"chain_id":"wenchang-tianhe","class_id":"dasdsa","nft_id":"dasdsa","recipient":"dasdsa",
"recipient_phone":"17381842007","sender":"dasdsa","tx_hash":"dasdsa"}

import cn.hutool.core.util.CharsetUtil;
import cn.hutool.crypto.SecureUtil;
import cn.hutool.crypto.asymmetric.Sign;
import cn.hutool.crypto.asymmetric.SignAlgorithm;
import java.util.Base64;

public class SignUtils {

    public static  boolean verifySign(String resData, String signData, String publicKey) {
        Sign sign = SecureUtil.sign(SignAlgorithm.SHA1withRSA,null, publicKey);
        //注意Base64
        return  sign.verify(resData.getBytes(CharsetUtil.CHARSET_UTF_8), Base64.getDecoder().decode(signData));
    }

    public static String sign(String respData, String platformPrivateKey, String platformPublicKey) {
        Sign sign = SecureUtil.sign(SignAlgorithm.SHA1withRSA, platformPrivateKey, platformPublicKey);
        byte[] signed = sign.sign(respData.getBytes(CharsetUtil.CHARSET_UTF_8));
        //注意Base64
        return  Base64.getEncoder().encodeToString(signed);
    }

}