Java PBEParameterSpec 测试

其他 Java 数据加密解密

package com.xu.mysql;

import java.security.Key;
import java.util.Random;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;


public class PBE {

    
    private final static String KEY_PBE = "PBEWITHMD5andDES";

    
    private final static int SALT_COUNT = 100;


    public static void main(String[] args) {
        // 加密前的原文
        String str = "hello world !!!";
        // 口令
        String key = "qwert";
        // 初始化盐
        byte[] salt = init();
        // 采用PBE算法加密
        byte[] encData = encrypt(str.getBytes(), key, salt);
        // 采用PBE算法解密
        byte[] decData = decrypt(encData, key, salt);

        System.out.println("加密前：" + str);
        System.out.println("加密后：" + new String(encData));
        System.out.println("解密后：" + new String(decData));
    }

    
    public static byte[] init() {
        byte[] salt = new byte[8];
        Random random = new Random();
        random.nextBytes(salt);
        return salt;
    }

    
    public static Key getKey(String key) {
        SecretKey secret = null;
        try {
            PBEKeySpec keySpec = new PBEKeySpec(key.toCharArray());
            SecretKeyFactory factory = SecretKeyFactory.getInstance(KEY_PBE);
            secret = factory.generateSecret(keySpec);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return secret;
    }

    
    public static byte[] encrypt(byte[] data, String key, byte[] salt) {
        byte[] v = null;
        try {
            // 获取密钥
            Key k = getKey(key);
            PBEParameterSpec spec = new PBEParameterSpec(salt, SALT_COUNT);
            Cipher cipher = Cipher.getInstance(KEY_PBE);
            cipher.init(Cipher.ENCRYPT_MODE, k, spec);
            v = cipher.doFinal(data);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return v;
    }

    
    public static byte[] decrypt(byte[] data, String key, byte[] salt) {
        byte[] bytes = null;
        try {
            // 获取密钥
            Key k = getKey(key);
            PBEParameterSpec parameterSpec = new PBEParameterSpec(salt, SALT_COUNT);
            Cipher cipher = Cipher.getInstance(KEY_PBE);
            cipher.init(Cipher.DECRYPT_MODE, k, parameterSpec);
            bytes = cipher.doFinal(data);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return bytes;
    }

}