package com.ssh.util;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;
/**
* DESede对称加密算法演示
*
* @author zolly
* */
public class DESedeCoder {
/**
* 密钥算法
* */
public static final String KEY_ALGORITHM = "DESede";
/**
* 加密/解密算法/工作模式/填充方式
* */
public static final String CIPHER_ALGORITHM = "DESede/ECB/PKCS5Padding";
/**
*
* 生成密钥
*
* @return byte[] 二进制密钥
* */
public static byte[] initkey() throws Exception {
// 实例化密钥生成器
KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);
// 初始化密钥生成器
kg.init(168);
// 生成密钥
SecretKey secretKey = kg.generateKey();
// 获取二进制密钥编码形式
byte[] key = secretKey.getEncoded();
BufferedOutputStream keystream =
new BufferedOutputStream(new FileOutputStream("DESedeKey.dat"));
keystream.write(key, 0, key.length);
keystream.flush();
keystream.close();
return key;
}
/**
* 转换密钥
*
* @param key
* 二进制密钥
* @return Key 密钥
* */
public static Key toKey(byte[] key) throws Exception {
// 实例化Des密钥
DESedeKeySpec dks = new DESedeKeySpec(key);
// 实例化密钥工厂
SecretKeyFactory keyFactory = SecretKeyFactory
.getInstance(KEY_ALGORITHM);
// 生成密钥
SecretKey secretKey = keyFactory.generateSecret(dks);
return secretKey;
}
/**
* 加密数据
*
* @param data
* 待加密数据
* @param key
* 密钥
* @return byte[] 加密后的数据
* */
public static byte[] encrypt(byte[] data, byte[] key) throws Exception {
// 还原密钥
Key k = toKey(key);
// 实例化
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
// 初始化，设置为加密模式
cipher.init(Cipher.ENCRYPT_MODE, k);
// 执行操作
return cipher.doFinal(data);
}
/**
* 解密数据
*
* @param data
* 待解密数据
* @param key
* 密钥
* @return byte[] 解密后的数据
* */
public static byte[] decrypt(byte[] data, byte[] key) throws Exception {
// 欢迎密钥
Key k = toKey(key);
// 实例化
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
// 初始化，设置为解密模式
cipher.init(Cipher.DECRYPT_MODE, k);
// 执行操作
return cipher.doFinal(data);
}
/**
* 加密字符串
* @param data
* @return
*/
public static String encode(String str,String screatKey){
String result = "";
byte[] data = DESedeCoder.encrypt(str.getBytes(), screatKey.getBytes());
result = Base64.encode(data);
return result;
}
/**
* 解密字符串
* @param str
* @return
*/
public static String decode(String str,String screatKey){
String result = "";
try {
byte[] data = Base64.decode(str);
data = DESedeCoder.decrypt(data, screatKey.getBytes());
result = new String(data);
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/**
* 进行加解密的测试
*
* @throws Exception
*/
public static void main(String[] args) throws Exception {
String key = "2C7dDYBy20mmKy3391xivikz";
String str = "hello world~";
System.out.println("Key:"+key);
System.out.println("原文：" + str);
//加密
String value = encode(str,key);
System.out.println("加密后：" + value);
System.out.println("解密后：" + decode(value,key));
}
}
/**
* DESede 数据加密解密类
*
* @author thisky@qq.com
*/
class DESedeCoder {
public static function encrypt($str, $key) {
$td = self::gettd($key);
$ret = base64_encode(mcrypt_generic($td, self::pkcs5_pad($str, 8)));
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $ret;
}
public static function decrypt($str, $key) {
$td = self::gettd($key);
$ret = self::pkcs5_unpad(mdecrypt_generic($td, base64_decode($str)));
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $ret;
}
private static function pkcs5_pad($text, $blocksize) {
$pad = $blocksize - (strlen($text) % $blocksize);
return $text . str_repeat(chr($pad), $pad);
}
private static function pkcs5_unpad($text) {
$pad = ord($text{strlen($text) - 1});
if ($pad > strlen($text)) {
return false;
}
if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) {
return false;
}
return substr($text, 0, -1 * $pad);
}
private static function getiv() {
return pack('H16', '0102030405060708');
}
private static function gettd($key) {
$iv = self::getiv();
$td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_ECB, '');
mcrypt_generic_init($td, $key, $iv);
return $td;
}
}