每日一得--对称加密算法之（PBE）_bc provider 全程-优快云博客

本文链接：https://blog.youkuaiyun.com/xoopx/article/details/44225117

本文详细介绍了如何使用Java的JDK和BouncyCastle提供器来实现对称加密算法，并通过实例展示了两种方式的加密和解密过程。文章深入探讨了两者之间的差异和应用场景。

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一，实现对称加密算法的方式：jdk实现方式和bcprov-jdk15-133.jar（简称bc）实现方式

import java.security.Key;
import java.security.SecureRandom;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import org.apache.commons.codec.binary.Hex;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class PBEMain {
private static String str = "husq PBE test";
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
jdkPBE();
bcPBE();
}

public static void jdkPBE(){
try{
//初始化盐
SecureRandom random = new SecureRandom();
byte[] salt = random.generateSeed(8);

//口令和密码
String password = "husq";
PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray());
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBEWITHMD5andDES");
Key key = factory.generateSecret(pbeKeySpec);

//加密
PBEParameterSpec pbeParameterSpec = new PBEParameterSpec(salt,100);
Cipher cipher = Cipher.getInstance("PBEWITHMD5andDES");
cipher.init(Cipher.ENCRYPT_MODE, key, pbeParameterSpec);

byte[] result = cipher.doFinal(str.getBytes());
System.out.println("jdk pbe encrypt="+Hex.encodeHexString(result));

//解密
cipher.init(Cipher.DECRYPT_MODE, key, pbeParameterSpec);
byte[] dsign = cipher.doFinal(result);
System.out.println("jdk pbe dncrypt="+new String(dsign));
System.out.println("==========================================");
}catch(Exception e){
e.printStackTrace();
}

}

public static void bcPBE(){

try{
Security.addProvider(new BouncyCastleProvider());

//初始化盐
SecureRandom random = new SecureRandom();
byte[] salt = random.generateSeed(8);

//口令和密码
String password = "husq";
PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray());
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBEWITHMD5andDES","BC");
Key key = factory.generateSecret(pbeKeySpec);

//加密
PBEParameterSpec pbeParameterSpec = new PBEParameterSpec(salt,100);
Cipher cipher = Cipher.getInstance("PBEWITHMD5andDES");
cipher.init(Cipher.ENCRYPT_MODE, key, pbeParameterSpec);

byte[] result = cipher.doFinal(str.getBytes());
System.out.println("bc pbe encrypt="+Hex.encodeHexString(result));

//解密
cipher.init(Cipher.DECRYPT_MODE, key, pbeParameterSpec);
byte[] dsign = cipher.doFinal(result);
System.out.println("bc pbe dncrypt="+new String(dsign));

}catch(Exception e){
e.printStackTrace();
}

}
}