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package com.nis.nmsclient.util;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
/**
* 通过DES加密解密实现一个String字符串的加密和解密.
*
*/
public class DESUtil {
private final static String key = "longstar";
/**
* DES加密方法
*
*/
public static String desEncrypt(String message) throws Exception {
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("ASCII"));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.getBytes("ASCII"));
cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
byte data[] = message.getBytes("ASCII");
byte[] encryptedData = cipher.doFinal(data);
return getBASE64(encryptedData);
}
/**
* DES解密方法
*
*/
public static String desDecrypt(String message) throws Exception {
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("ASCII"));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.getBytes("ASCII"));
cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
byte data[] = getFromBASE64(message);
byte[] encryptedData = cipher.doFinal(data);
return new String(encryptedData);
}
// 对base64编码的string解码成byte数组
private static byte[] getFromBASE64(String s) {
if (s == null)
return null;
BASE64Decoder decoder = new BASE64Decoder();
try {
byte[] b = decoder.decodeBuffer(s);
return b;
} catch (Exception e) {
return null;
}
}
//将 byte数组 进行 BASE64 编码
private static String getBASE64(byte[] b) {
if (b == null)
return null;
try {
String returnstr = (new BASE64Encoder()).encode(b);
return returnstr;
} catch (Exception e) {
return null;
}
}
}
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