由于等保和多个系统间的数据传输加密, 写了一个共有的前端与后端, 后端与后端,的通用算法SM2简单加密,  不需要验签, 几行代码搞定. 

引包, 测试好几遍, 这个包适合jdk1.8使用

1、后端代码示例

引包,

        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcprov-jdk18on</artifactId>
            <version>1.72</version>
        </dependency>

没有意外就应该直接能用下面代码了

import org.bouncycastle.asn1.gm.GMNamedCurves;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.crypto.engines.SM2Engine;
import org.bouncycastle.crypto.params.*;
import org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPrivateKey;
import org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPublicKey;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.util.encoders.Hex;
import org.junit.Test;

import java.math.BigInteger;
import java.security.*;
import java.security.spec.ECGenParameterSpec;


/**
 * 简单的sm2
 */
public class SimpSM2Util {

    /**
     * SM2加密算法
     * @param publicKey     公钥
     * @param data          明文数据
     * @return
     */
    public static String encrypt(String publicKey, String data) {
        // 获取一条SM2曲线参数
        X9ECParameters sm2ECParameters = GMNamedCurves.getByName("sm2p256v1");
        // 构造ECC算法参数，曲线方程、椭圆曲线G点、大整数N
        ECDomainParameters domainParameters = new ECDomainParameters(sm2ECParameters.getCurve(), sm2ECParameters.getG(), sm2ECParameters.getN());
        //提取公钥点
        ECPoint pukPoint = sm2ECParameters.getCurve().decodePoint(Hex.decode(publicKey));
        // 公钥前面的02或者03表示是压缩公钥，04表示未压缩公钥, 04的时候，可以去掉前面的04
        ECPublicKeyParameters publicKeyParameters = new ECPublicKeyParameters(pukPoint, domainParameters);

        SM2Engine sm2Engine = new SM2Engine(SM2Engine.Mode.C1C3C2);
        // 设置sm2为加密模式
        sm2Engine.init(true, new ParametersWithRandom(publicKeyParameters, new SecureRandom()));

        byte[] arrayOfBytes = null;
        try {
            byte[] in = data.getBytes();
            arrayOfBytes = sm2Engine.processBlock(in, 0, in.length);
        } catch (Exception e) {
            System.out.println("SM2加密时出现异常:"+e.getMessage());
        }
        return Hex.toHexString(arrayOfBytes);

    }

    /**
     * SM2解密算法
     * @param privateKey        私钥
     * @param cipherData        密文数据
     * @return
     */
    public static String decrypt(String privateKey, String cipherData) {
        // 使用BC库加解密时密文以04开头，传入的密文前面没有04则补上
        if (!cipherData.startsWith("04")){
            cipherData = "04" + cipherData;
        }
        byte[] cipherDataByte = Hex.decode(cipherData);
        BigInteger privateKeyD = new BigInteger(privateKey, 16);
        //获取一条SM2曲线参数
        X9ECParameters sm2ECParameters = GMNamedCurves.getByName("sm2p256v1");
        //构造domain参数
        ECDomainParameters domainParameters = new ECDomainParameters(sm2ECParameters.getCurve(), sm2ECParameters.getG(), sm2ECParameters.getN());
        ECPrivateKeyParameters privateKeyParameters = new ECPrivateKeyParameters(privateKeyD, domainParameters);

        SM2Engine sm2Engine = new SM2Engine(SM2Engine.Mode.C1C3C2);
        // 设置sm2为解密模式
        sm2Engine.init(false, privateKeyParameters);

        String result = "";
        try {
            byte[] arrayOfBytes = sm2Engine.processBlock(cipherDataByte, 0, cipherDataByte.length);
            return new String(arrayOfBytes);
        } catch (Exception e) {
            System.out.println("SM2解密时出现异常:"+e.getMessage());
        }
        return result;
    }

    /*@Test  
    // 生成密钥
    public void createKey() throws Exception{
        //String M="encryption standard111111111111111111111111111111";
        SimpSM2Util sm2 = new SimpSM2Util();
        ECGenParameterSpec sm2Spec = new ECGenParameterSpec("sm2p256v1");
        // 获取一个椭圆曲线类型的密钥对生成器
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("EC", new BouncyCastleProvider());
        // 使用SM2参数初始化生成器
        kpg.initialize(sm2Spec);
        // 获取密钥对
        KeyPair keyPair = kpg.generateKeyPair();
        PublicKey publicKey = keyPair.getPublic();
        BCECPublicKey p=(BCECPublicKey)publicKey;
        System.out.println("publicKey："+Hex.toHexString(p.getQ().getEncoded(false)));

        PrivateKey privateKey = keyPair.getPrivate();
        BCECPrivateKey s=(BCECPrivateKey)privateKey;
        System.out.println("privateKey："+Hex.toHexString(s.getD().toByteArray()));

    }*/
}

    publicKey：04aa909915f87880507e3de515220cc8f82b1c5693f56a0475b3b48ff7448c229734cd724e603000dd78569faa9fbc1eeb93a6d836190a0ee734e2d9e74d804f28
    privateKey：00a684d832831d5371d2ff9de6a021a33fb396451e74e0ffe0d415c298b36876fe

加密:  SimpSM2Util.encrypt("共有密钥", "明文"); 

解密:  SimpSM2Util.decrypt("私有密钥", "密文");

后端代码使用一个工具类, 可参考

import org.bouncycastle.crypto.engines.SM2Engine;

/**
 * 简单单例SM2加解密, 配合前端
 */
public class LoSM2 {

    private static String ECNameModel = "sm2p256v1";
    private static SM2Engine.Mode CipherMode = SM2Engine.Mode.C1C3C2;
    private final String privateKey;
    private final String publicKey;

    private LoSM2(String privateKey, String publicKey){
        this.privateKey = privateKey;
        this.publicKey = publicKey;
    }

    private volatile static LoSM2 instance = null;

    public static LoSM2 getInstance(){
        if(instance == null){
            throw new RuntimeException("请InitKey初始化密钥!!!");
        }
        return instance;
    }

    /**
     * SM2初始密钥(私钥,公钥)
     * @param privateKey
     * @param publicKey
     * @return
     */
    public static LoSM2 InitKey(String privateKey, String publicKey) {
        if(instance == null){
            synchronized(LoSM2.class){
                if(instance == null){
                    instance = new LoSM2(privateKey, publicKey);
                }
            }
        }
        return instance;
    }

    private static class SM2SimpSelfLoader {
        private static final LoSM2 instance = InitKey("", "");
    }

    private static boolean IsInitKey(){
        if(instance == null) {
            throw new RuntimeException("请InitKey初始化密钥!!!");
        }else {
            return true;
        }
    }

    /**
     * SM2加密
     * @param cleartext          明文数据
     */
    public String encrypt(String cleartext) {
        if(!IsInitKey())
            return "";
        return SimpSM2Util.encrypt(instance.publicKey, cleartext);        
    }

    /**
     * SM2解密
     * @param cipherData        密文数据
     */
    public static String decrypt(String cipherData) {
        if(!IsInitKey())
            return "";
        return SimpSM2Util.decrypt(instance.privateKey, cipherData);
    }

}

2、前端代码示例

安装sm-crypto包:   npm install --save sm-crypto

前端加解密更简单,  引包后就能用

let txt='简单加密不要验签'  //要加密的字段
const sm2 = require('sm-crypto').sm2
const cipherMode = 1;// 1 - C1C3C2，0 - C1C2C3，默认为1
var publicKey =  "04aa909915f87880507e3de515220cc8f82b1c5693f56a0475b3b48ff7448c229734cd724e603000dd78569faa9fbc1eeb93a6d836190a0ee734e2d9e74d804f28";
// 加密结果            
let encryptData = sm2.doEncrypt(txt, publicKey, cipherMode);
// 解密
sm2.doDecrypt(txt, privateKey, cipherMode);

适合简单的传输加密

3、避坑指南

在引用 bcprov-jdk18on 包的时候, 有可能存在版本冲突, 或本地安全问题,  这个是我在返回切换工程遇到的问题 

可以尝试把 bcprov-jdk18on-1.72.jar 加入mvn的import的sdks里面

还可以试试 mvn idea:module

或者试试  mvn: idea:idea