1.下载BouncyCastle相关jar包;
2.将下载的两个jar包拷贝到$JAVA_HOME$\jre\lib\ext
目录下面;
3.修改配置文件$JAVA_HOME$\jre\lib\security\java.security
,在末尾添加security.provider.11=org.bouncycastle.jce.provider.BouncyCastleProvider
;
4.在项目中导入jar包:bcprov-ext-jdk15to18-168.jar
;
5.在项目中import BouncyCastle的相关包,产生联想即配置完成。
sm2_demo.java
(调用SM2加解密功能)package BC;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import java.security.*;
import java.security.spec.ECGenParameterSpec;
public class sm2_demo {
private static String M="lzc_SM2_demo";
public static void main(String[] args) throws NoSuchAlgorithmException, InvalidAlgorithmParameterException {
SM2Util sm2 = new SM2Util();
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());
// 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();
PrivateKey privateKey = keyPair.getPrivate();
String data = sm2.encrypt(publicKey,M);
System.out.println(data);
String text=sm2.decrypt(privateKey,data);
System.out.println(text);
}
}
SM2Util.java
(SM2加解密工具类)package BC;
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 {
/**
* SM2加密算法
* @param publicKey 公钥
* @param data 明文数据
* @return
*/
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);
}
/**
* SM2解密算法
* @param privateKey 私钥
* @param cipherData 密文数据
* @return
*/
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;
}
}
原文:https://www.cnblogs.com/fzlzc/p/14595817.html