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Sm2加解密原理，非对称加密，公钥加密，私钥解密。公私钥对成对生成，加密端解密端各自保存。用公钥加密必须要用对应的私钥才能解密，保证安全性。

这里我们实现的功能是前端加密，后端解密，这样前端暴露了公钥，后端持有配对的私钥，保证安全性。

1.jsp引入sm2

<script type="text/javascript" src="${pageContext.request.contextPath}/jslib/jquery-easyui-1.5.2/jquery.easyui.min.js" charset="utf-8"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/jslib/sm2/crypto-js.js" charset="utf-8"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/jslib/sm2/sm2.js" charset="utf-8"></script>

2.js加密

改写sm2.js，输入公钥

function sm2EncryptPwd(data) {var publicKey = '04XXXXXXXXXXXXXXXXXXXXXXXXXXXCB42F6044B1BA8640B42AE038252F3490F02029E37B91D6E0796DE0B3D67166CDD971E556EF1D6B54ED350031817DED6B0C40';return sm2Encrypt(data, publicKey, 1);}

公钥用后端的生成公私钥对方法生成，请勿使用文章提到的公私钥对。

例如login.js使用了加密，即

login.js，调用加密函数

var encryptedPwd = sm2EncryptPwd(pwd);

3.后端Java解密

引用依赖库 bcprov-jdk15on-1.68.jar

<dependency><groupId>org.bouncycastle</groupId><artifactId>bcprov-jdk15on</artifactId><version>1.68</version></dependency>

login.java

私钥附上对应的值

pwd = new String(SM2Utils.decrypt(pwd, sm2PrivKey));

Sm2Utils.java

package com.sgsg.basic.encrypt.util;import org.bouncycastle.asn1.gm.GMNamedCurves;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.engines.SM2Engine;
import org.bouncycastle.crypto.params.ECDomainParameters;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.crypto.params.ParametersWithRandom;
import org.bouncycastle.crypto.signers.SM2Signer;
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.jce.spec.ECParameterSpec;
import org.bouncycastle.jce.spec.ECPrivateKeySpec;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.util.encoders.Hex;import java.math.BigInteger;
import java.nio.charset.StandardCharsets;
import java.security.InvalidAlgorithmParameterException;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.spec.ECGenParameterSpec;
import java.util.Base64;/*** SM2工具类* @author van*/public class SM2Utils {/*** 生成 SM2 公私钥对** @return* @throws NoSuchAlgorithmException* @throws InvalidAlgorithmParameterException*/public static KeyPair geneSM2KeyPair() throws NoSuchAlgorithmException, InvalidAlgorithmParameterException {final ECGenParameterSpec sm2Spec = new ECGenParameterSpec("sm2p256v1");// 获取一个椭圆曲线类型的密钥对生成器final KeyPairGenerator kpg = KeyPairGenerator.getInstance("EC", new BouncyCastleProvider());// 产生随机数SecureRandom secureRandom = new SecureRandom();// 使用SM2参数初始化生成器kpg.initialize(sm2Spec, secureRandom);// 获取密钥对KeyPair keyPair = kpg.generateKeyPair();return keyPair;}/*** 生产hex秘钥对*/public static void geneSM2HexKeyPair(){try {KeyPair keyPair = geneSM2KeyPair();PrivateKey privateKey = keyPair.getPrivate();PublicKey publicKey = keyPair.getPublic();System.out.println("========  EC X Y keyPair    ========");System.out.println(privateKey);System.out.println(publicKey);System.out.println("========  hex keyPair       ========");System.out.println("hex priKey: " + getPriKeyHexString(privateKey));System.out.println("hex pubKey: " + getPubKeyHexString(publicKey));System.out.println("========  base64 keyPair    ========");System.out.println("base64 priKey: " + new String(Base64.getEncoder().encode(privateKey.getEncoded())));System.out.println("base64 pubKey: " + new String(Base64.getEncoder().encode(publicKey.getEncoded())));System.out.println("========  generate finished ========");} catch (Exception e) {e.printStackTrace();}}/*** 获取私钥（16进制字符串，头部不带00长度共64）** @param privateKey 私钥PrivateKey型* @return*/public static String getPriKeyHexString(PrivateKey privateKey) {// OK
//	        BCECPrivateKey s=(BCECPrivateKey)privateKey;
//	        String priKeyHexString = Hex.toHexString(s.getD().toByteArray());
//	        if(null!= priKeyHexString && priKeyHexString.length()==66 && "00".equals(priKeyHexString.substring(0,2))){
//	            return priKeyHexString.substring(2);
//	        }// OKBCECPrivateKey key = (BCECPrivateKey) privateKey;BigInteger intPrivateKey = key.getD();String priKeyHexString = intPrivateKey.toString(16);return priKeyHexString;}/*** 获取私钥 base64字符串** @param privateKey 私钥PrivateKey型* @return*/public static String getPriKeyBase64String(PrivateKey privateKey) {return new String(Base64.getEncoder().encode(privateKey.getEncoded()));}/*** 获取公钥（16进制字符串，头部带04长度共130）** @param publicKey 公钥PublicKey型* @return*/public static String getPubKeyHexString(PublicKey publicKey) {BCECPublicKey key = (BCECPublicKey) publicKey;return Hex.toHexString(key.getQ().getEncoded(false));}/*** 获取公钥 base64字符串** @param publicKey 公钥PublicKey型* @return*/public static String getPubKeyBase64String(PublicKey publicKey) {return new String(Base64.getEncoder().encode(publicKey.getEncoded()));}/*** SM2加密算法** @param publicKey 公钥* @param data      明文数据* @return*/public static String encrypt(String data, PublicKey publicKey) {return encrypt(data.getBytes(StandardCharsets.UTF_8), publicKey);}/*** @param data* @param publicKey* @return* @author * @version 1.0* 2023年4月12日下午4:41:24*/public static String encrypt(byte[] data, PublicKey publicKey) {BCECPublicKey key = (BCECPublicKey) publicKey;return encrypt(data, Hex.toHexString(key.getQ().getEncoded(false)));}/*** @param data* @param pubKeyHexString* @return* @author * @version 1.0* 2023年4月12日下午4:46:37*/public static String encrypt(String data, String pubKeyHexString) {return encrypt(data.getBytes(StandardCharsets.UTF_8), pubKeyHexString);}/*** SM2加密算法** @param pubKeyHexString 公钥（16进制字符串）* @param data            明文数据* @return hex字符串*/public static String encrypt(byte[] data, String pubKeyHexString) {// 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NECDomainParameters domainParameters = new ECDomainParameters(sm2ECParameters.getCurve(), sm2ECParameters.getG(), sm2ECParameters.getN());//提取公钥点ECPoint pukPoint = sm2ECParameters.getCurve().decodePoint(Hex.decode(pubKeyHexString));// 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04ECPublicKeyParameters 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 {arrayOfBytes = sm2Engine.processBlock(data, 0, data.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 cipherData    hex格式密文* @param privateKey    密钥PrivateKey型* @return              明文*/public static String decrypt(String cipherData, PrivateKey privateKey) {return decrypt(Hex.decode(cipherData), privateKey);}/*** @param cipherData* @param privateKey* @return* @author * @version 1.0* 2023年4月12日下午4:46:50*/public static String decrypt(byte[] cipherData, PrivateKey privateKey) {BCECPrivateKey key = (BCECPrivateKey) privateKey;return decrypt(cipherData, Hex.toHexString(key.getD().toByteArray()));}/*** @param cipherData* @param priKeyHexString* @return* @author * @version 1.0* 2023年4月12日下午4:46:53*/public static String decrypt(String cipherData, String priKeyHexString) {// 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;}return decrypt(Hex.decode(cipherData), priKeyHexString);}/*** SM2解密算法** @param cipherData      密文数据* @param priKeyHexString 私钥（16进制字符串）* @return*/public static String decrypt(byte[] cipherData, String priKeyHexString) {//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());BigInteger privateKeyD = new BigInteger(priKeyHexString, 16);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(cipherData, 0, cipherData.length);return new String(arrayOfBytes);} catch (Exception e) {System.out.println("SM2解密时出现异常:" + e.getMessage());}return result;}/*** @param data* @param priKeyHexString hex私钥，长度64* @return hex格式签名值* @throws Exception*/public static String sign(String data, String priKeyHexString) throws Exception {return sign(data.getBytes(StandardCharsets.UTF_8), priKeyHexString);}/*** 签名* @param data              原始数据，字节数组* @param priKeyHexString   hex私钥，64长度* @return                  Hex字符串* @throws Exception*/public static String sign(byte[] data, String priKeyHexString) throws Exception {String signValue = null;SM2Signer signer = new SM2Signer();X9ECParameters sm2ECParameters = GMNamedCurves.getByName("sm2p256v1");//构造domain参数ECDomainParameters domainParameters = new ECDomainParameters(sm2ECParameters.getCurve(), sm2ECParameters.getG(), sm2ECParameters.getN());CipherParameters param = new ParametersWithRandom(new ECPrivateKeyParameters(new BigInteger(priKeyHexString, 16), domainParameters));signer.init(true, param);signer.update(data, 0, data.length);signValue = Hex.toHexString(signer.generateSignature());return signValue;}/*** 验签* @param data                  数据* @param signValue             签名值(hex型)* @param pKHexString    hex130长度公钥* @return */public static boolean verify(String data, String signValue, String publicKeyHexString) throws Exception {return verify(data.getBytes(StandardCharsets.UTF_8), Hex.decode(signValue), publicKeyHexString);}/*** 验签* @param data                  原始数据字节数组* @param sign                  字节数组()* @param pKHexString    hex130长度公钥* @return                      true or false* @throws Exception*/public static boolean verify(byte[] data, byte[] sign, String pKHexString) throws Exception {SM2Signer signer = new SM2Signer();X9ECParameters sm2ECParameters = GMNamedCurves.getByName("sm2p256v1");//构造domain参数ECDomainParameters domainParameters = new ECDomainParameters(sm2ECParameters.getCurve(), sm2ECParameters.getG(), sm2ECParameters.getN());if (pKHexString.length() == 128) {pKHexString = "04" + pKHexString;}ECPoint ecPoint = sm2ECParameters.getCurve().decodePoint(Hex.decode(pKHexString));CipherParameters param = new ECPublicKeyParameters(ecPoint, domainParameters);signer.init(false, param);signer.update(data, 0, data.length);return signer.verifySignature(sign);}/*** 私钥生成公钥* @param priKeyHexString 私钥Hex格式，必须64位* @return 公钥Hex格式，04开头，130位* @throws Exception 例如：*/public static String getPubKeyByPriKey(String priKeyHexString) throws Exception {if (priKeyHexString == null || priKeyHexString.length() != 64) {System.err.println("priKey 必须是Hex 64位格式，例如：11d0a44d47449d48d614f753ded6b06af76033b9c3a2af2b8b2239374ccbce3a");return "";}String pubKeyHexString = null;X9ECParameters sm2ECParameters = GMNamedCurves.getByName("sm2p256v1");//构造domain参数BigInteger privateKeyD = new BigInteger(priKeyHexString, 16);ECParameterSpec ecParameterSpec = new ECParameterSpec(sm2ECParameters.getCurve(), sm2ECParameters.getG(), sm2ECParameters.getN());ECPrivateKeySpec ecPrivateKeySpec = new ECPrivateKeySpec(privateKeyD, ecParameterSpec);PrivateKey privateKey = null;privateKey = KeyFactory.getInstance("EC", new BouncyCastleProvider()).generatePrivate(ecPrivateKeySpec);// 临时解决办法String pointString = privateKey.toString();
//	        System.out.println(pointString);String pointString_X = pointString.substring(pointString.indexOf("X: ") + "X: ".length(), pointString.indexOf("Y: ")).trim();String pointString_Y = pointString.substring(pointString.indexOf("Y: ") + "Y: ".length()).trim();
//	        System.out.println(pointString_X);
//	        System.out.println(pointString_Y);pubKeyHexString = "04" + pointString_X + pointString_Y;return pubKeyHexString;}}