对称加密算法

package com.kaishengit.security;

import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.DESedeKeySpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Hex;

/**
 * 对称加密帮助类
 * @author kdj
 * 创建时间:2018年4月12日
 */
public class SymmetricUtil {

    public static void main(String[] args) {
        try {
            String pas = "要加密的字符串！！";
            
            //DES
            String keyVal = getKeyStrByType("DES");
            //加密
            String desStr = DESEncode(pas, keyVal);
            System.out.println("DES encode:"+desStr);
            //解密
            System.out.println("DES decode:"+DESDecode(desStr, keyVal));
            
            //DES3
            keyVal = getKeyStrByType("DESede");
            //加密
            desStr = DES3Encode(pas, keyVal);
            System.out.println("DES3 encode:"+desStr);
            //解密
            System.out.println("DES3 decode:"+DES3Decode(desStr, keyVal));
            
            //AES
            keyVal = getKeyStrByType("AES");
            //加密
            desStr = AESEncode(pas, keyVal);
            System.out.println("AES encode:"+desStr);
            //解密
            System.out.println("AES decode:"+AESDecode(desStr, keyVal));
            
            //PBE
            SecureRandom random = new SecureRandom();
            byte[] salt = random.generateSeed(8);
            String saltStr = Hex.encodeHexString(salt);
            String password = "qwertyuiop";
            //加密
            desStr = PBEEncode(pas, saltStr, password);
            System.out.println("PBE encode:"+desStr);
            //解密
            System.out.println("PBE decode:"+PBEDecode(desStr, saltStr, password));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    /**
     * DES加密
     * @param pas
     * @param keyVal
     * @return
     * @throws Exception
     */
    public static String DESEncode(String pas,String keyVal) throws Exception{
        byte[] keyArr = Hex.decodeHex(keyVal);
        //key的转换
        DESKeySpec desKeySpec = new DESKeySpec(keyArr);
        SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("DES");
        Key converSecretKey = secretKeyFactory.generateSecret(desKeySpec);
        //进行加密
        //加密的格式
        Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, converSecretKey);
        byte[] result = cipher.doFinal(pas.getBytes());
        return Hex.encodeHexString(result);
    }
    
    /**
     * DES解密
     * @param pas
     * @param keyVal
     * @return
     * @throws Exception
     */
    public static String DESDecode(String pas,String keyVal) throws Exception{
        //解密
        byte[] keyArr = Hex.decodeHex(keyVal);
        //key的转换
        DESKeySpec desKeySpec = new DESKeySpec(keyArr);
        SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("DES");
        Key converSecretKey = secretKeyFactory.generateSecret(desKeySpec);
        
        Cipher cipher = Cipher.getInstance("DES");
        cipher.init(Cipher.DECRYPT_MODE, converSecretKey);
        byte[] result = cipher.doFinal(Hex.decodeHex(pas));
        return new String(result);
    }
    
    /**
     * DES3加密
     * @param pas
     * @param keyVal
     * @return
     * @throws Exception
     */
    public static String DES3Encode(String pas,String keyVal) throws Exception{
        byte[] keyArr = Hex.decodeHex(keyVal);
        //key的转换
        DESedeKeySpec desKeySpec = new DESedeKeySpec(keyArr);
        SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("DESede");
        Key converSecretKey = secretKeyFactory.generateSecret(desKeySpec);
        //进行加密
        //加密的格式
        Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, converSecretKey);
        byte[] result = cipher.doFinal(pas.getBytes());
        return Hex.encodeHexString(result);
    }
    
    /**
     * DES3解密
     * @param pas
     * @param keyVal
     * @return
     * @throws Exception
     */
    public static String DES3Decode(String pas,String keyVal) throws Exception{
        //解密
        byte[] keyArr = Hex.decodeHex(keyVal);
        //key的转换
        DESedeKeySpec desKeySpec = new DESedeKeySpec(keyArr);
        SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("DESede");
        Key converSecretKey = secretKeyFactory.generateSecret(desKeySpec);
        
        Cipher cipher = Cipher.getInstance("DESede");
        cipher.init(Cipher.DECRYPT_MODE, converSecretKey);
        byte[] result = cipher.doFinal(Hex.decodeHex(pas));
        return new String(result);
    }
    
    /**
     * AES的加密
     * @param pas
     * @param keyVal
     * @return
     * @throws Exception
     */
    public static String AESEncode(String pas,String keyVal) throws Exception{
        Key key = new SecretKeySpec(Hex.decodeHex(keyVal), "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] result = cipher.doFinal(pas.getBytes());
        String resultStr = Hex.encodeHexString(result);
        return resultStr;
    }
    
    /**
     * AES的解密
     * @param pas
     * @param keyVal
     * @return
     * @throws Exception
     */
    public static String AESDecode(String pas,String keyVal) throws Exception{
        Key key = new SecretKeySpec(Hex.decodeHex(keyVal), "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, key);
        byte[] result = cipher.doFinal(Hex.decodeHex(pas));
        return new String(result);
    }
    
    /**
     * PBE加密
     * @param val 要加密的字符串
     * @param keyVal 密钥
     * @param salt 盐
     * @param password 口令
     * @return
     * @throws Exception
     */
    public static String PBEEncode(String val,String salt,String password) throws Exception{
        PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray());
        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBEWITHMD5andDES");
        Key key = factory.generateSecret(pbeKeySpec);
        
        PBEParameterSpec pbeParameterSpec = new PBEParameterSpec(Hex.decodeHex(salt), 100);
        Cipher cipher = Cipher.getInstance("PBEWITHMD5andDES");
        cipher.init(Cipher.ENCRYPT_MODE, key,pbeParameterSpec);
        byte[] bytes = cipher.doFinal(val.getBytes());
        return Hex.encodeHexString(bytes);
    }
    
    /**
     * PBE解密
     * @param val 要解密的字符串
     * @param keyVal 秘钥
     * @param salt 盐
     * @param password 口令
     * @return
     * @throws Exception
     */
    public static String PBEDecode(String val,String salt,String password) throws Exception{
        PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray());
        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBEWITHMD5andDES");
        Key key = factory.generateSecret(pbeKeySpec);
        //解密
        PBEParameterSpec pbeParameterSpec2 = new PBEParameterSpec(Hex.decodeHex(salt), 100);
        Cipher cipher2 = Cipher.getInstance("PBEWITHMD5andDES");
        cipher2.init(Cipher.DECRYPT_MODE, key,pbeParameterSpec2);
        byte[] bytes2 = cipher2.doFinal(Hex.decodeHex(val));
        return new String(bytes2);
    }
    
    /**
     * DES和AES生成的KEY
     * @param type
     * @return
     * @throws Exception
     */
    public static String getKeyStrByType(String type) throws Exception{
        //生成key
        KeyGenerator keyGenerator = KeyGenerator.getInstance(type);
        //生成默认长度的key
        keyGenerator.init(new SecureRandom());
        SecretKey secretKey = keyGenerator.generateKey();
        byte[] bytekey = secretKey.getEncoded();
        return Hex.encodeHexString(bytekey);
    }
    
    
}