一、SM2、SM3介绍：
1. SM2是非对称加密算法
它是基于椭圆曲线密码的公钥密码算法标准，其秘钥长度256bit，包含数字签名、密钥交换和公钥加密，用于替换RSA/DH/ECDSA/ECDH等国际算法。可以满足电子认证服务系统等应用需求，由国家密码管理局于2010年12月17号发布。
2.SM3是一种密码杂凑算法
用于替代MD5/SHA-1/SHA-2等国际算法，适用于数字签名和验证、消息认证码的生成与验证以及随机数的生成，可以满足电子认证服务系统等应用需求，于2010年12月17日发布。它是在SHA-256基础上改进实现的一种算法，采用Merkle-Damgard结构，消息分组长度为512bit，输出的摘要值长度为256bit。
二、SM2、SM3在项目中的使用：
SM2用于前后端密码加密传输，SM3用于数据库密码加密。
三、SM2在项目中具体使用
1. 前端部分关键代码
1.1 npm安装国密
npm install --save sm-crypto1.2 vue中引用国密
const sm2 = require('sm-crypto').sm2; // 引用国密
const cipherMode = 1; // 密文排列方式0-C1C2C3；1-C1C3C21.3 data中定义公钥public
data() {
return {
codeUrl: "",
loginForm: {
username: "admin",
password: "admin",
rememberMe: false,
code: "",
uuid: "",
pubKey:"", // 自己的公钥，这里后端返回后赋值
},
}
}1.4将密码加密后传到后端
const passwordEn = sm2.doEncrypt(password,pubKey,cipherMode);2.后端关键代码
2.1 依赖 pom.xml
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>1.57</version>
</dependency>
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-ext-jdk15on</artifactId>
<version>1.57</version>
</dependency>2.2 扩展类 SM2EngineExtend.java
/**
* 对org.bouncycastle:bcprov-jdk15on:1.57扩展
* <br/>BC库加密结果是按C1C2C3，国密标准是C1C3C2（加密芯片也是这个排列），
* <br/>本扩展主要实现加密结果排列方式可选
*/
public class SM2EngineExtend {
private final Digest digest;
/**是否为加密模式*/
private boolean forEncryption;
private ECKeyParameters ecKey;
private ECDomainParameters ecParams;
private int curveLength;
private SecureRandom random;
/**密文排序方式*/
private int cipherMode;
/**BC库默认排序方式-C1C2C3*/
public static int CIPHERMODE_BC = 0;
/**国密标准排序方式-C1C3C2*/
public static int CIPHERMODE_NORM = 1;
public SM2EngineExtend() {
this(new SM3Digest());
}
public SM2EngineExtend(Digest digest) {
this.digest = digest;
}
/**
* 设置密文排序方式
* @param cipherMode
*/
public void setCipherMode(int cipherMode){
this.cipherMode = cipherMode;
}
/**
* 默认初始化方法，使用国密排序标准
* @param forEncryption - 是否以加密模式初始化
* @param param - 曲线参数
*/
public void init(boolean forEncryption, CipherParameters param) {
init(forEncryption, CIPHERMODE_NORM, param);
}
/**
* 默认初始化方法，使用国密排序标准
* @param forEncryption 是否以加密模式初始化
* @param cipherMode 加密数据排列模式：1-标准排序；0-BC默认排序
* @param param 曲线参数
*/
public void init(boolean forEncryption, int cipherMode, CipherParameters param) {
this.forEncryption = forEncryption;
this.cipherMode = cipherMode;
if (forEncryption) {
ParametersWithRandom rParam = (ParametersWithRandom) param;
ecKey = (ECKeyParameters) rParam.getParameters();
ecParams = ecKey.getParameters();
ECPoint s = ((ECPublicKeyParameters) ecKey).getQ().multiply(ecParams.getH());
if (s.isInfinity()) {
throw new IllegalArgumentException("invalid key: [h]Q at infinity");
}
random = rParam.getRandom();
} else {
ecKey = (ECKeyParameters) param;
ecParams = ecKey.getParameters();
}
curveLength = (ecParams.getCurve().getFieldSize() + 7) / 8;
}
/**
* 加密或解密输入数据
* @param in
* @param inOff
* @param inLen
* @return
* @throws InvalidCipherTextException
*/
public byte[] processBlock( byte[] in, int inOff, int inLen) throws InvalidCipherTextException {
if (forEncryption) {
// 加密
return encrypt(in, inOff, inLen);
} else {
return decrypt(in, inOff, inLen);
}
}
/**
* 加密实现，根据cipherMode输出指定排列的结果，默认按标准方式排列
* @param in
* @param inOff
* @param inLen
* @return
* @throws InvalidCipherTextException
*/
private byte[] encrypt(byte[] in, int inOff, int inLen)
throws InvalidCipherTextException {
byte[] c2 = new byte[inLen];
System.arraycopy(in, inOff, c2, 0, c2.length);
byte[] c1;
ECPoint kPB;
do {
BigInteger k = nextK();
ECPoint c1P = ecParams.getG().multiply(k).normalize();
c1 = c1P.getEncoded(false);
kPB = ((ECPublicKeyParameters) ecKey).getQ().multiply(k).normalize();
kdf(digest, kPB, c2);
}
while (notEncrypted(c2, in, inOff));
byte[] c3 = new byte[digest.getDigestSize()];
addFieldElement(digest, kPB.getAffineXCoord());
digest.update(in, inOff, inLen);
addFieldElement(digest, kPB.getAffineYCoord());
digest.doFinal(c3, 0);
if (cipherMode == CIPHERMODE_NORM){
return Arrays.concatenate(c1, c3, c2);
}
return Arrays.concatenate(c1, c2, c3);
}
/**
* 解密实现，默认按标准排列方式解密，解密时解出c2部分原文并校验c3部分
* @param in
* @param inOff
* @param inLen
* @return
* @throws InvalidCipherTextException
*/
private byte[] decrypt(byte[] in, int inOff, int inLen)
throws InvalidCipherTextException {
byte[] c1 = new byte[curveLength * 2 + 1];
System.arraycopy(in, inOff, c1, 0, c1.length);
ECPoint c1P = ecParams.getCurve().decodePoint(c1);
ECPoint s = c1P.multiply(ecParams.getH());
if (s.isInfinity()) {
throw new InvalidCipherTextException("[h]C1 at infinity");
}
c1P = c1P.multiply(((ECPrivateKeyParameters) ecKey).getD()).normalize();
byte[] c2 = new byte[inLen - c1.length - digest.getDigestSize()];
if (cipherMode == CIPHERMODE_BC) {
System.arraycopy(in, inOff + c1.length, c2, 0, c2.length);
}else{
// C1 C3 C2
System.arraycopy(in, inOff + c1.length + digest.getDigestSize(), c2, 0, c2.length);
}
kdf(digest, c1P, c2);
byte[] c3 = new byte[digest.getDigestSize()];
addFieldElement(digest, c1P.getAffineXCoord());
digest.update(c2, 0, c2.length);
addFieldElement(digest, c1P.getAffineYCoord());
digest.doFinal(c3, 0);
int check = 0;
// 检查密文输入值C3部分和由摘要生成的C3是否一致
if (cipherMode == CIPHERMODE_BC) {
for (int i = 0; i != c3.length; i++) {
check |= c3[i] ^ in[c1.length + c2.length + i];
}
}else{
for (int i = 0; i != c3.length; i++) {
check |= c3[i] ^ in[c1.length + i];
}
}
clearBlock(c1);
clearBlock(c3);
if (check != 0) {
clearBlock(c2);
throw new InvalidCipherTextException("invalid cipher text");
}
return c2;
}
private boolean notEncrypted(byte[] encData, byte[] in, int inOff) {
for (int i = 0; i != encData.length; i++) {
if (encData[i] != in[inOff]) {
return false;
}
}
return true;
}
private void kdf(Digest digest, ECPoint c1, byte[] encData) {
int ct = 1;
int v = digest.getDigestSize();
byte[] buf = new byte[digest.getDigestSize()];
int off = 0;
for (int i = 1; i <= ((encData.length + v - 1) / v); i++) {
addFieldElement(digest, c1.getAffineXCoord());
addFieldElement(digest, c1.getAffineYCoord());
digest.update((byte) (ct >> 24));
digest.update((byte) (ct >> 16));
digest.update((byte) (ct >> 8));
digest.update((byte) ct);
digest.doFinal(buf, 0);
if (off + buf.length < encData.length) {
xor(encData, buf, off, buf.length);
} else {
xor(encData, buf, off, encData.length - off);
}
off += buf.length;
ct++;
}
}
private void xor(byte[] data, byte[] kdfOut, int dOff, int dRemaining) {
for (int i = 0; i != dRemaining; i++) {
data[dOff + i] ^= kdfOut[i];
}
}
private BigInteger nextK() {
int qBitLength = ecParams.getN().bitLength();
BigInteger k;
do {
k = new BigInteger(qBitLength, random);
}
while (k.equals(ECConstants.ZERO) || k.compareTo(ecParams.getN()) >= 0);
return k;
}
private void addFieldElement(Digest digest, ECFieldElement v) {
byte[] p = BigIntegers.asUnsignedByteArray(curveLength, v.toBigInteger());
digest.update(p, 0, p.length);
}
/**
* clear possible sensitive data
*/
private void clearBlock(
byte[] block) {
for (int i = 0; i != block.length; i++) {
block[i] = 0;
}
}
}2.3 SM2加解密工具类Sm2Util.java
public class Sm2Util {
/**
* 获取sm2密钥对
* BC库使用的公钥=64个字节+1个字节（04标志位），BC库使用的私钥=32个字节
* SM2秘钥的组成部分有 私钥D 、公钥X 、 公钥Y , 他们都可以用长度为64的16进制的HEX串表示，
* <br/>SM2公钥并不是直接由X+Y表示 , 而是额外添加了一个头，当启用压缩时:公钥=有头+公钥X ，即省略了公钥Y的部分
*
* @param compressed 是否压缩公钥（加密解密都使用BC库才能使用压缩）
* @return
*/
public static String[] getSm2Keys(boolean compressed) {
//获取一条SM2曲线参数
X9ECParameters sm2ECParameters = GMNamedCurves.getByName(Constant.CRYPTO_NAME_SM2);
//构造domain参数
ECDomainParameters domainParameters = new ECDomainParameters(sm2ECParameters.getCurve(), sm2ECParameters.getG(), sm2ECParameters.getN());
//1.创建密钥生成器
ECKeyPairGenerator keyPairGenerator = new ECKeyPairGenerator();
//2.初始化生成器,带上随机数
try {
keyPairGenerator.init(new ECKeyGenerationParameters(domainParameters, SecureRandom.getInstance("SHA1PRNG")));
} catch (NoSuchAlgorithmException e) {
System.out.println(e.getMessage());
}
//3.生成密钥对
AsymmetricCipherKeyPair asymmetricCipherKeyPair = keyPairGenerator.generateKeyPair();
ECPublicKeyParameters publicKeyParameters = (ECPublicKeyParameters) asymmetricCipherKeyPair.getPublic();
ECPoint ecPoint = publicKeyParameters.getQ();
// 把公钥放入map中,默认压缩公钥
// 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
String publicKey = Hex.toHexString(ecPoint.getEncoded(compressed));
ECPrivateKeyParameters privateKeyParameters = (ECPrivateKeyParameters) asymmetricCipherKeyPair.getPrivate();
BigInteger intPrivateKey = privateKeyParameters.getD();
// 把私钥放入map中
String privateKey = intPrivateKey.toString(16);
String[] KeyPairOfString = new String[2];
KeyPairOfString[0] = publicKey;
KeyPairOfString[1] = privateKey;
return KeyPairOfString;
}
/**
* SM2加密算法
* @param publicKey 公钥
* @param data 待加密的数据
* @return 密文，BC库产生的密文带由04标识符，与非BC库对接时需要去掉开头的04
*/
public static String encrypt(String publicKey, String data){
// 按国密排序标准加密
return encrypt(publicKey, data, SM2EngineExtend.CIPHERMODE_NORM);
}
/**
* SM2加密算法
* @param publicKey 公钥
* @param data 待加密的数据
* @param cipherMode 密文排列方式0-C1C2C3；1-C1C3C2；
* @return 密文，BC库产生的密文带由04标识符，与非BC库对接时需要去掉开头的04
*/
public static String encrypt(String publicKey, String data, int cipherMode) {
// 获取一条SM2曲线参数
X9ECParameters sm2ECParameters = GMNamedCurves.getByName(Constant.CRYPTO_NAME_SM2);
// 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);
SM2EngineExtend sm2Engine = new SM2EngineExtend();
// 设置sm2为加密模式
sm2Engine.init(true, cipherMode, 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(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) {
// // 按国密排序标准解密
return decrypt(privateKey, cipherData, SM2EngineExtend.CIPHERMODE_NORM);
}
/**
* SM2解密算法
* @param privateKey 私钥
* @param cipherData 密文数据
* @param cipherMode 密文排列方式0-C1C2C3；1-C1C3C2；
* @return
*/
public static String decrypt(String privateKey, String cipherData, int cipherMode) {
// 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);
//获取一条SM2曲线参数
X9ECParameters sm2ECParameters = GMNamedCurves.getByName(Constant.CRYPTO_NAME_SM2);
//构造domain参数
ECDomainParameters domainParameters = new ECDomainParameters(sm2ECParameters.getCurve(), sm2ECParameters.getG(), sm2ECParameters.getN());
BigInteger privateKeyD = new BigInteger(privateKey, 16);
ECPrivateKeyParameters privateKeyParameters = new ECPrivateKeyParameters(privateKeyD, domainParameters);
SM2EngineExtend sm2Engine = new SM2EngineExtend();
// 设置sm2为解密模式
sm2Engine.init(false, cipherMode, privateKeyParameters);
String result = "";
try {
byte[] arrayOfBytes = sm2Engine.processBlock(cipherDataByte, 0, cipherDataByte.length);
return new String(arrayOfBytes);
} catch (Exception e) {
System.out.println(e.getMessage());
}
return result;
}
/**
* 私钥签名
*
* @param data 未加密的密码明文
* @param privateKey
* @return
* @throws Exception
*/
public static byte[] signByPrivateKey(byte[] data, PrivateKey privateKey) throws Exception {
Signature sig = Signature.getInstance(GMObjectIdentifiers.sm2sign_with_sm3.toString(), BouncyCastleProvider.PROVIDER_NAME);
sig.initSign(privateKey);
sig.update(data);
byte[] ret = sig.sign();
return ret;
}
/**
* 公钥验签
*
* @param data 未加密的密码明文
* @param publicKey
* @param signature 签名
* @return
* @throws Exception
*/
public static boolean verifyByPublicKey(byte[] data, PublicKey publicKey, byte[] signature) throws Exception {
Signature sig = Signature.getInstance(GMObjectIdentifiers.sm2sign_with_sm3.toString(), BouncyCastleProvider.PROVIDER_NAME);
sig.initVerify(publicKey);
sig.update(data);
boolean ret = sig.verify(signature);
return ret;
}
}2.4 测试类 EncryptAndDecryptTest.java
@SpringBootTest
public class EncryptAndDecryptTest {
private String pwd = "123456";
@Test
void testEncryptAndDecrypt(){
System.out.println("未加密密码："+pwd);
String[] sm2Keys = Sm2Util.getSm2Keys(false);
String pubKey = sm2Keys[0];
System.out.println("公钥："+pubKey);
String priKey = sm2Keys[1];
System.out.println("私钥："+priKey);
// 国密加密
String encrypt = Sm2Util.encrypt(pubKey, pwd);
System.out.println("国密加密后密码:"+encrypt);
// 国密解密
String decrypt = Sm2Util.decrypt(priKey, encrypt);
System.out.println("国密解密后密码:"+decrypt);
// BC库加密
String encrypt1 = Sm2Util.encrypt(pubKey, pwd, 1);
System.out.println("BC加密："+encrypt1);
String decrypt1 = Sm2Util.decrypt(priKey, encrypt1, 1);
System.out.println("BC解密："+decrypt1);
}
}2.5 测试结果
未加密密码：123456
公钥：04bd133a440cd5ebaeeb68c958953a7794134c3992d2c3fd006571c7f1c7b3ebef484595ecd298d6c22fd1c0f84ba7ca8595761c271c959dc1370d7528c55b1ccb
私钥：835b53881c3e391ba430022119bf6b0f7fd7764ec9808d305ea5b620c531363e
国密加密后密码:04795bd0129b2b08891eb1b24567b5d026f3f56e42bee356dc120fc5bf699baac5b818ab2f3086791ee8bab8868a301e9e2b2884f2ef67ab6b615b6fe235f7c204ad520dfcd82c945420979d12accf014d4fe75724987b9ae8d96a5e1099af45b0ac970eceac9e
国密解密后密码:123456
BC加密：0464fcab91fa522f877f45c204e1043f3c9124d290f4b68c6c1bd5f420ce184c560d2654d781924b0d0d24affe32aac569f7c12a0c951e02478c50cf6e0bf241f5d225178c7c35a2cd5aa39d2381e27e74701b9c6efd439882775a33d1ce2367c51c2669f248d7
BC解密：123456四、SM3在项目中具体使用
使用hutool工具类
1. 依赖 pom.xml
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.1.4</version>
</dependency>
<!-- bcprov-jdk15to18 SM3-->
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15to18</artifactId>
<version>1.69</version>
</dependency>2. 测试类 Sm3Test.java
@SpringBootTest
public class Sm3Test {
@Test
void encryTest(){
String encryptStr = SmUtil.sm3("123");
System.out.println("未加密的明文:123");
System.out.println("SM3加密后的密文:"+encryptStr);
}
}3. 测试结果
未加密的明文:123
SM3加密后的密文:6e0f9e14344c5406a0cf5a3b4dfb665f87f4a771a31f7edbb5c72874a32b2957本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
