使用OpenEuler x86_64 实现Bouncycastle SM2加解密

一、安装运行环境

• 安装java和maven

   sudo yum install java-17-openjdk
   sudo yum install maven
  

  安装完成后，你就可以在 OpenEuler 上使用 Maven 来管理 Java 项目了。

二、创建项目工程

1. 在项目根目录下创建pom.xml文件用于添加Bouncycastle的依赖项。

   vi pom.xml

加入内容：

  <project xmlns="http://maven.apache.org/POM/4.0.0"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <groupId>com.example</groupId>
  <artifactId>MySM2Project</artifactId>
  <version>1.0-SNAPSHOT</version>

  <dependencies>
  <dependency>
      <groupId>org.bouncycastle</groupId>
      <artifactId>bcprov-jdk15to18</artifactId>
      <version>1.77</version>
  </dependency>
  <dependency>
      <groupId>org.bouncycastle</groupId>
      <artifactId>bcprov-ext-jdk15to18</artifactId>
      <version>1.77</version>
  </dependency>

2. 将源代码放入src/main/java/BC目录下。

sm2_demo.java:

  import org.bouncycastle.jce.provider.BouncyCastleProvider;
  import java.security.*;
  import java.security.spec.ECGenParameterSpec;
  public class sm2_demo {
      static {
          Security.addProvider(new BouncyCastleProvider());
      }

  private static final String M = "lzc_SM2_demo";

  public static void main(String[] args) throws NoSuchAlgorithmException, InvalidAlgorithmParameterException {
      try {
          SM2Util sm2 = new SM2Util();
          final ECGenParameterSpec sm2Spec = new ECGenParameterSpec("sm2p256v1");
          final KeyPairGenerator kpg = KeyPairGenerator.getInstance("EC", "BC");
          kpg.initialize(sm2Spec);
          KeyPair keyPair = kpg.generateKeyPair();
          PublicKey publicKey = keyPair.getPublic();
          PrivateKey privateKey = keyPair.getPrivate();

          String data = sm2.encrypt(publicKey, M);
          System.out.println(data);

          String text = sm2.decrypt(privateKey, data);
          System.out.println(text);
          } catch (NoSuchProviderException e) {
          e.printStackTrace();
          }
      }
  }

SMUtil.java:

  import java.security.Security;
  import org.bouncycastle.jce.provider.BouncyCastleProvider;

  import java.security.Provider;

  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.spec.ECParameterSpec;
  import org.bouncycastle.util.encoders.Hex;

  import java.security.PrivateKey;
  import java.security.PublicKey;
  import java.security.SecureRandom;

  public class SM2Util {

  static {
      Provider provider = new BouncyCastleProvider();
      Security.addProvider(provider);
  }

  public String encrypt(PublicKey publicKey, String data) {
      ECPublicKeyParameters ecPublicKeyParameters = null;
      if (publicKey instanceof BCECPublicKey) {
          BCECPublicKey bcecPublicKey = (BCECPublicKey) publicKey;
          ECParameterSpec ecParameterSpec = bcecPublicKey.getParameters();
          ECDomainParameters ecDomainParameters = new ECDomainParameters(
                  ecParameterSpec.getCurve(), ecParameterSpec.getG(), ecParameterSpec.getN());
          ecPublicKeyParameters = new ECPublicKeyParameters(bcecPublicKey.getQ(), ecDomainParameters);
      }
      SM2Engine sm2Engine = new SM2Engine();
      sm2Engine.init(true, new ParametersWithRandom(ecPublicKeyParameters, new SecureRandom()));
      byte[] arrayOfBytes = null;
      try {
          byte[] in = data.getBytes("utf-8");
          arrayOfBytes = sm2Engine.processBlock(in, 0, in.length);
      } catch (Exception e) {
          System.out.println("SM2加密时出现异常:");
      }
      return Hex.toHexString(arrayOfBytes);
  }
      public String decrypt(PrivateKey privateKey, String cipherData) {
      byte[] cipherDataByte = Hex.decode(cipherData);
      BCECPrivateKey bcecPrivateKey = (BCECPrivateKey) privateKey;
      ECParameterSpec ecParameterSpec = bcecPrivateKey.getParameters();
      ECDomainParameters ecDomainParameters = new ECDomainParameters(
              ecParameterSpec.getCurve(), ecParameterSpec.getG(), ecParameterSpec.getN());
      ECPrivateKeyParameters ecPrivateKeyParameters = new ECPrivateKeyParameters(
              bcecPrivateKey.getD(), ecDomainParameters);
      SM2Engine sm2Engine = new SM2Engine();
      sm2Engine.init(false, ecPrivateKeyParameters);
      String result = null;
      try {
          byte[] arrayOfBytes = sm2Engine.processBlock(cipherDataByte, 0, cipherDataByte.length);
          return new String(arrayOfBytes, "utf-8");
      } catch (Exception e) {
          System.out.println("SM2解密时出现异常");
      }
      return result;
      }
  }

3. 创建lib文件夹，并将从官网上下载的bcprov-ext-jdk15to18-177.jar和bcprov-jdk15to18-177.jar放入其中。

   Bouncycastle官网：https://www.bouncycastle.org/latest_releases.html

三、编译和运行

1. 编译

使用mvn系列命令进行编译：

    mvn clean install

最终项目结构为：

2. 运行

使用命令运行：

   java -cp target/classes:target/MySM2Project-1.0-SNAPSHOT.jar:lib/* sm2_demo

3. 运行结果