javasm2国密加解密工具类

javasm2国密加解密工具类可以用于对数据进行国密SM2算法的加解密、签名和验签操作。以下是一个简单的示例代码：

import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.digests.SM3Digest;
import org.bouncycastle.crypto.engines.SM2Engine;
import org.bouncycastle.crypto.generators.AsymmetricKeyPairGenerator;
import org.bouncycastle.crypto.generators.ECKeyPairGenerator;
import org.bouncycastle.crypto.params.*;
import org.bouncycastle.crypto.signers.SM2Signer;
import org.bouncycastle.crypto.util.PrivateKeyFactory;
import org.bouncycastle.crypto.util.PublicKeyFactory;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Hex;

import java.security.Security;

public class SM2Util {

    static {
        Security.addProvider(new BouncyCastleProvider());
    }

    public static AsymmetricCipherKeyPair generateKeyPair() {
        ECKeyPairGenerator gen = new ECKeyPairGenerator();
        gen.init(new ECKeyGenerationParameters(
                SM2UtilParams.sm2ECParams, SM2UtilParams.random));
        return gen.generateKeyPair();
    }

    public static String encrypt(byte[] data, ECPublicKeyParameters publicKey) throws Exception {
        SM2Engine engine = new SM2Engine();
        CipherParameters param = new ParametersWithRandom(publicKey, SM2UtilParams.random);
        engine.init(true, param);
        byte[] enc = engine.processBlock(data, 0, data.length);
        return Hex.toHexString(enc);
    }

    public static byte[] decrypt(String data, ECPrivateKeyParameters privateKey) throws Exception {
        SM2Engine engine = new SM2Engine();
        CipherParameters param = new ParametersWithRandom(privateKey, SM2UtilParams.random);
        engine.init(false, param);
        byte[] dec = Hex.decode(data);
        return engine.processBlock(dec, 0, dec.length);
    }

    public static String sign(byte[] data, ECPrivateKeyParameters privateKey) throws Exception {
        SM2Signer signer = new SM2Signer();
        signer.init(true, new ParametersWithRandom(privateKey, SM2UtilParams.random));
        signer.update(data, 0, data.length);
        byte[] sig = signer.generateSignature();
        return Hex.toHexString(sig);
    }

    public static boolean verify(byte[] data, String sign, ECPublicKeyParameters publicKey) throws Exception {
        SM2Signer signer = new SM2Signer();
        signer.init(false, publicKey);
        signer.update(data, 0, data.length);
        byte[] sig = Hex.decode(sign);
        return signer.verifySignature(sig);
    }

    public static void main(String[] args) throws Exception {
        AsymmetricCipherKeyPair keyPair = SM2Util.generateKeyPair();
        ECPublicKeyParameters publicKey = (ECPublicKeyParameters) keyPair.getPublic();
        ECPrivateKeyParameters privateKey = (ECPrivateKeyParameters) keyPair.getPrivate();
        String message = "hello world";
        byte[] data = message.getBytes();
        String encData = SM2Util.encrypt(data, publicKey);
        System.out.println("encData: " + encData);
        byte[] decData = SM2Util.decrypt(encData, privateKey);
        System.out.println("decData: " + new String(decData));
        String sign = SM2Util.sign(data, privateKey);
        System.out.println("sign: " + sign);
        boolean verifyResult = SM2Util.verify(data, sign, publicKey);
        System.out.println("verifyResult: " + verifyResult);
    }
}

注意：该示例代码仅供参考，具体实现应根据具体需求进行修改和完善。同时，使用国密算法需要遵守相关法律法规。