国密算法加密解密加签验签
Posted 健身小白
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理论就不说了；我也看不懂，这两篇够了
https://blog.51cto.com/u_13929722/3422122
https://blog.csdn.net/w57685321/article/details/109102706?spm=1001.2101.3001.6650.16&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7Edefault-16.opensearchhbase&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7Edefault-16.opensearchhbase
sm2非对称加密
package com.it.sm2.test;
import org.bouncycastle.asn1.gm.GMNamedCurves;
import org.bouncycastle.asn1.x9.X9ECParameters;
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.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.jce.spec.ECPublicKeySpec;
import org.bouncycastle.util.encoders.Hex;
import java.math.BigInteger;
import java.security.*;
import java.security.spec.ECGenParameterSpec;
/**
* @ClassName SM2Utils
* @Description SM2算法工具类
* @Author msx
* @Date 2021/9/24 16:50
* @Version 1.0
*/
public class SM2Utils
/**
* @Description 生成秘钥对
* @Author msx
* @return KeyPair
*/
public static KeyPair createECKeyPair()
//使用标准名称创建EC参数生成的参数规范
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;
try
kpg = KeyPairGenerator.getInstance("EC", new BouncyCastleProvider());
// 使用SM2算法域参数集初始化密钥生成器（默认使用以最高优先级安装的提供者的 SecureRandom 的实现作为随机源）
// kpg.initialize(sm2Spec);
// 使用SM2的算法域参数集和指定的随机源初始化密钥生成器
kpg.initialize(sm2Spec, new SecureRandom());
// 通过密钥生成器生成密钥对
return kpg.generateKeyPair();
catch (Exception e)
e.printStackTrace();
return null;
/**
* @Description 公钥加密
* @Author msx
* @param publicKeyHex SM2十六进制公钥
* @param data 明文数据
* @return String
*/
public static String encrypt(String publicKeyHex, String data)
return encrypt(getECPublicKeyByPublicKeyHex(publicKeyHex), data, 1);
/**
* @Description 公钥加密
* @Author msx
* @param publicKey SM2公钥
* @param data 明文数据
* @param modeType 加密模式
* @return String
*/
public static String encrypt(BCECPublicKey publicKey, String data, int modeType)
//加密模式
SM2Engine.Mode mode = SM2Engine.Mode.C1C3C2;
if (modeType != 1)
mode = SM2Engine.Mode.C1C2C3;
//通过公钥对象获取公钥的基本域参数。
ECParameterSpec ecParameterSpec = publicKey.getParameters();
ECDomainParameters ecDomainParameters = new ECDomainParameters(ecParameterSpec.getCurve(),
ecParameterSpec.getG(), ecParameterSpec.getN());
//通过公钥值和公钥基本参数创建公钥参数对象
ECPublicKeyParameters ecPublicKeyParameters = new ECPublicKeyParameters(publicKey.getQ(), ecDomainParameters);
//根据加密模式实例化SM2公钥加密引擎
SM2Engine sm2Engine = new SM2Engine(mode);
//初始化加密引擎
sm2Engine.init(true, new ParametersWithRandom(ecPublicKeyParameters, new SecureRandom()));
byte[] arrayOfBytes = null;
try
//将明文字符串转换为指定编码的字节串
byte[] in = data.getBytes("utf-8");
//通过加密引擎对字节数串行加密
arrayOfBytes = sm2Engine.processBlock(in, 0, in.length);
catch (Exception e)
System.out.println("SM2加密时出现异常:" + e.getMessage());
e.printStackTrace();
//将加密后的字节串转换为十六进制字符串
return Hex.toHexString(arrayOfBytes);
/**
* @Description 私钥解密
* @Author msx
* @param privateKeyHex SM2十六进制私钥
* @param cipherData 密文数据
* @return String
*/
public static String decrypt(String privateKeyHex, String cipherData)
return decrypt(getBCECPrivateKeyByPrivateKeyHex(privateKeyHex), cipherData, 1);
/**
* @Description 私钥解密
* @Author msx
* @param privateKey SM私钥
* @param cipherData 密文数据
* @param modeType 解密模式
* @return
*/
public static String decrypt(BCECPrivateKey privateKey, String cipherData, int modeType)
//解密模式
SM2Engine.Mode mode = SM2Engine.Mode.C1C3C2;
if (modeType != 1)
mode = SM2Engine.Mode.C1C2C3;
//将十六进制字符串密文转换为字节数组（需要与加密一致，加密是：加密后的字节数组转换为了十六进制字符串）
byte[] cipherDataByte = Hex.decode(cipherData);
//通过私钥对象获取私钥的基本域参数。
ECParameterSpec ecParameterSpec = privateKey.getParameters();
ECDomainParameters ecDomainParameters = new ECDomainParameters(ecParameterSpec.getCurve(),
ecParameterSpec.getG(), ecParameterSpec.getN());
//通过私钥值和私钥钥基本参数创建私钥参数对象
ECPrivateKeyParameters ecPrivateKeyParameters = new ECPrivateKeyParameters(privateKey.getD(),
ecDomainParameters);
//通过解密模式创建解密引擎并初始化
SM2Engine sm2Engine = new SM2Engine(mode);
sm2Engine.init(false, ecPrivateKeyParameters);
String result = null;
try
//通过解密引擎对密文字节串进行解密
byte[] arrayOfBytes = sm2Engine.processBlock(cipherDataByte, 0, cipherDataByte.length);
//将解密后的字节串转换为utf8字符编码的字符串（需要与明文加密时字符串转换成字节串所指定的字符编码保持一致）
result = new String(arrayOfBytes, "utf-8");
catch (Exception e)
System.out.println("SM2解密时出现异常" + e.getMessage());
return result;
//椭圆曲线ECParameters ASN.1 结构
private static X9ECParameters x9ECParameters = GMNamedCurves.getByName("sm2p256v1");
//椭圆曲线公钥或私钥的基本域参数。
private static ECParameterSpec ecDomainParameters = new ECParameterSpec(x9ECParameters.getCurve(), x9ECParameters.getG(), x9ECParameters.getN());
/**
* @Description 公钥字符串转换为 BCECPublicKey 公钥对象
* @Author msx
* @param pubKeyHex 64字节十六进制公钥字符串(如果公钥字符串为65字节首个字节为0x04：表示该公钥为非压缩格式，操作时需要删除)
* @return BCECPublicKey SM2公钥对象
*/
public static BCECPublicKey getECPublicKeyByPublicKeyHex(String pubKeyHex)
//截取64字节有效的SM2公钥（如果公钥首个字节为0x04）
if (pubKeyHex.length() > 128)
pubKeyHex = pubKeyHex.substring(pubKeyHex.length() - 128);
//将公钥拆分为x,y分量（各32字节）
String stringX = pubKeyHex.substring(0, 64);
String stringY = pubKeyHex.substring(stringX.length());
//将公钥x、y分量转换为BigInteger类型
BigInteger x = new BigInteger(stringX, 16);
BigInteger y = new BigInteger(stringY, 16);
//通过公钥x、y分量创建椭圆曲线公钥规范
ECPublicKeySpec ecPublicKeySpec = new ECPublicKeySpec(x9ECParameters.getCurve().createPoint(x, y), ecDomainParameters);
//通过椭圆曲线公钥规范，创建出椭圆曲线公钥对象（可用于SM2加密及验签）
return new BCECPublicKey("EC", ecPublicKeySpec, BouncyCastleProvider.CONFIGURATION);
/**
* @Description 私钥字符串转换为 BCECPrivateKey 私钥对象
* @Author msx
* @param privateKeyHex 32字节十六进制私钥字符串
* @return BCECPrivateKey SM2私钥对象
*/
public static BCECPrivateKey getBCECPrivateKeyByPrivateKeyHex(String privateKeyHex)
//将十六进制私钥字符串转换为BigInteger对象
BigInteger d = new BigInteger(privateKeyHex, 16);
//通过私钥和私钥域参数集创建椭圆曲线私钥规范
ECPrivateKeySpec ecPrivateKeySpec = new ECPrivateKeySpec(d, ecDomainParameters);
//通过椭圆曲线私钥规范，创建出椭圆曲线私钥对象（可用于SM2解密和签名）
return new BCECPrivateKey("EC", ecPrivateKeySpec, BouncyCastleProvider.CONFIGURATION);
public static void main(String[] args)
String publicKeyHex = null;
String privateKeyHex = null;
KeyPair keyPair = createECKeyPair();
PublicKey publicKey = keyPair.getPublic();
if (publicKey instanceof BCECPublicKey)
//获取65字节非压缩缩的十六进制公钥串(0x04)
publicKeyHex = Hex.toHexString(((BCECPublicKey) publicKey).getQ().getEncoded(false));
System.out.println("---->SM2公钥：" + publicKeyHex);
PrivateKey privateKey = keyPair.getPrivate();
if (privateKey instanceof BCECPrivateKey)
//获取32字节十六进制私钥串
privateKeyHex = ((BCECPrivateKey) privateKey).getD().toString(16);
System.out.println("---->SM2私钥：" + privateKeyHex);
/**
* 公钥加密
*/
String data = "=========待加密数据=========";
//将十六进制公钥串转换为 BCECPublicKey 公钥对象
String encryptData = encrypt(publicKeyHex, data);
System.out.println("---->加密结果：" + encryptData);
/**
* 私钥解密
*/
//将十六进制私钥串转换为 BCECPrivateKey 私钥对象
data = decrypt(privateKeyHex, encryptData);
System.out.println("---->解密结果：" + data);
加签验签sm3 信息摘要
package com.it.sm2.test;
import org.bouncycastle.crypto.digests.SM3Digest;
import org.bouncycastle.crypto.macs.HMac;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.pqc.math.linearalgebra.ByteUtils;
import java.io.UnsupportedEncodingException;
import java.security.Security;
import java.util.Arrays;
/**
* SM3 工具类
*/
public class Sm3Util
/**
* 编码格式
*/
private static final String ENCODING = "UTF-8";
static
Security.addProvider(new BouncyCastleProvider());
/**
*
* @param paramStr 要sm3加密的内容
* @return sm3加密后密文
*/
public static String encrypt(String paramStr)
String resultHexString = "";
try
byte[] srcData = paramStr.getBytes(ENCODING);
byte[] hash = hash(srcData);
resultHexString = ByteUtils.toHexString(hash);
catch (UnsupportedEncodingException e)
e.printStackTrace();
return resultHexString;
public static byte[] hash(byte[] srcData)
SM3Digest sm3Digest = new SM3Digest();
sm3Digest.update(srcData,0,srcData.length);
byte[] bytes = new byte[sm3Digest.getDigestSize()];
sm3Digest.doFinal(bytes,0);
return bytes;
/**
*
* @param str 明文
* @param hexString 密文
* @return 明文密文对比结果
*/
public static boolean verify(String str,String hexString)
boolean flag = false;
try
byte[] srcData = str.getBytes(ENCODING);
byte[] sm3Hash = ByteUtils.fromHexString(hexString);
byte[] hash = hash(srcData);
if (Arrays.equals(hash,sm3Hash))
flag = true;
catch (UnsupportedEncodingException e)
e.printStackTrace();
return flag;
public static void main(String[] args)
String str = "0451ed3ea94dd89dc73874b2ceffe91f871a703f94b4c808aff7556edcea516674ff19959aae253fbed089cda7cc140b208cc3d305d507890c39b65dfd7e1ac4fd108f6ca988516cb20cb8c20ef766659463b1a391fe6d6a56de8c83e5373a9a17df8a80245c4a06e3946ad6e5c7c002c7c6c5695ca486e8dcf8f468d7f1099848c6";
// String encrypt = Sm3Util.encrypt(str);
// System.out.println("签名 ："+encrypt);
boolean verify = Sm3Util.verify(str, "3897564389af5c277da28b75e2617ac906b4175d93e76811e05e9975e4fb2c96");
System.out.println("验签结果 ：" + verify);
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