废话不多说，直接奉上代码：
复制代码 代码如下:
package com.eabax.plugin.yundada.utils;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import org.apache.commons.codec.binary.Base64;
import sun.misc.BASE64Decoder;
public class DESEncryptHelper {
private final static String DES = "DES";
/**
* 生成密钥
* @param employeeCode
*/
public static String getDESKey(String encryptStr){
if (!CacheManager.getCache().containsKey("encryptKey_"+encryptStr)) {
CacheManager.getCache().put("encryptKey_"+encryptStr, encryptStr+"tablemiyaokey");
}
String key = (String) CacheManager.getCache().get("encryptKey_"+encryptStr);
return key;
}
/**
* Description 根据键值进行解密
* @param data
* @param key 加密键byte数组
* @return
* @throws IOException
* @throws Exception
*/
public static String decrypt(String data, String key) throws IOException,
Exception {
if (data == null)
return null;
BASE64Decoder decoder = new BASE64Decoder();
byte[] buf = decoder.decodeBuffer(data);
byte[] bt = decrypt(buf,key.getBytes());
return new String(bt);
}
/**
* 对字符串加密
* @param str
* @return
* @throws InvalidKeyException
* @throws IllegalBlockSizeException
* @throws BadPaddingException
* @throws InvalidKeySpecException
* @throws NoSuchAlgorithmException
* @throws NoSuchPaddingException
*/
public static String getEncryptStr(String str,String encryptStr) throws InvalidKeyException,
IllegalBlockSizeException, BadPaddingException,
InvalidKeySpecException, NoSuchAlgorithmException,
NoSuchPaddingException {
//获取key
String key = getDESKey(encryptStr);
//获取密钥
SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");
DESKeySpec keyspec = new DESKeySpec(key.getBytes());
SecretKey deskey = factory.generateSecret(keyspec);
// Cipher负责完成加密或解密工作
Cipher c = Cipher.getInstance("DES");
// 根据密钥，对Cipher对象进行初始化，DECRYPT_MODE表示加密模式
c.init(Cipher.ENCRYPT_MODE, deskey);
byte[] src = str.getBytes();
// 该字节数组负责保存加密的结果
byte[] cipherByte = c.doFinal(src);
String enstr = new String(Base64.encodeBase64(cipherByte));
return enstr;
}
/**
* Description 根据键值进行解密
* @param data
* @param key 加密键byte数组
* @return
* @throws Exception
*/
private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
// 生成一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密钥数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher对象实际完成解密操作
Cipher cipher = Cipher.getInstance(DES);
// 用密钥初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
return cipher.doFinal(data);
}
}
以上就是本文关于DES加密解密的代码了，希望对大家学习java有所帮助。
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