java写一个SM2验签RS代码

下面是Java代码示例，用于SM2验签RS：

import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.digests.SM3Digest;
import org.bouncycastle.crypto.generators.ECKeyPairGenerator;
import org.bouncycastle.crypto.params.ECDomainParameters;
import org.bouncycastle.crypto.params.ECKeyGenerationParameters;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.crypto.signers.SM2Signer;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.math.ec.ECPoint;

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Security;
import java.security.Signature;

public class SM2Test {

    public static void main(String[] args) throws Exception {
        Security.addProvider(new BouncyCastleProvider());

        // 生成密钥对
        KeyPairGenerator kg = KeyPairGenerator.getInstance("EC", "BC");
        kg.initialize(256);
        KeyPair kp = kg.generateKeyPair();
        PrivateKey priKey = kp.getPrivate();
        PublicKey pubKey = kp.getPublic();

        // 签名
        byte[] data = "Hello World!".getBytes();
        Signature signature = Signature.getInstance("SM3withSM2", "BC");
        signature.initSign(priKey);
        signature.update(data);
        byte[] signBytes = signature.sign();

        // 验签
        signature.initVerify(pubKey);
        signature.update(data);
        boolean verifyResult = signature.verify(signBytes);
        System.out.println("验签结果：" + verifyResult);
    }
}

其中，BouncyCastle是一个流行的Java加密库，需要引入相关依赖。注意，在使用SM2验签时，需要使用SM3摘要算法进行签名和验签，同时需要使用SM2Signer进行签名操作。在验签时，需要使用Signature.getInstance("SM3withSM2", "BC")来获取验签对象。