原文：http://toptulip.iteye.com/blog/780309 使用php加密字符串，生成密文，java解析密文还原字符串. Java的部分直接复制调不通，改了下，下面的代码是能正常运行的。 php:
<?php
class DES
{
var $key;
var $iv; //偏移量
function DES($key, $iv=0)
{
$this->key = $key;
if($iv == 0)
{
$this->iv = $key;
}
else
{
$this->iv = $iv;
}
}
//加密
function encrypt($str)
{
$size = mcrypt_get_block_size ( MCRYPT_DES, MCRYPT_MODE_CBC );
$str = $this->pkcs5Pad ( $str, $size );
$data=mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_ENCRYPT, $this->iv);
//$data=strtoupper(bin2hex($data)); //返回大写十六进制字符串
return base64_encode($data);
}
//解密
function decrypt($str)
{
$str = base64_decode ($str);
//$strBin = $this->hex2bin( strtolower($str));
$str = mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_DECRYPT, $this->iv );
$str = $this->pkcs5Unpad( $str );
return $str;
}
function hex2bin($hexData)
{
$binData = "";
for($i = 0; $i < strlen ( $hexData ); $i += 2)
{
$binData .= chr(hexdec(substr($hexData, $i, 2)));
}
return $binData;
}
function pkcs5Pad($text, $blocksize)
{
$pad = $blocksize - (strlen ( $text ) % $blocksize);
return $text . str_repeat ( chr ( $pad ), $pad );
}
function pkcs5Unpad($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 );
}
}
$str = 'abcd';
$key= 'asdfwef5';
$crypt = new DES($key);
$mstr = $crypt->encrypt($str);
$str = $crypt->decrypt($mstr);
echo $str.' <=> '.$mstr;
?>
java:
package com.test;
import it.sauronsoftware.base64.Base64;
import java.security.Key;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
public class Main
{
public static final String ALGORITHM_DES = "DES/CBC/PKCS5Padding";
/**
* DES算法，加密
*
* @param data 待加密字符串
* @param key 加密私钥，长度不能够小于8位
* @return 加密后的字节数组，一般结合Base64编码使用
* @throws CryptException 异常
*/
public static String encode(String key,String data) throws Exception
{
return encode(key, data.getBytes());
}
/**
* DES算法，加密
*
* @param data 待加密字符串
* @param key 加密私钥，长度不能够小于8位
* @return 加密后的字节数组，一般结合Base64编码使用
* @throws CryptException 异常
*/
public static String encode(String key,byte[] data) throws Exception
{
try
{
DESKeySpec dks = new DESKeySpec(key.getBytes());
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
//key的长度不能够小于8位字节
Key secretKey = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
IvParameterSpec iv = new IvParameterSpec(key.getBytes());
AlgorithmParameterSpec paramSpec = iv;
cipher.init(Cipher.ENCRYPT_MODE, secretKey,paramSpec);
byte[] bytes = cipher.doFinal(data);
// return byte2hex(bytes);
return new String(Base64.encode(bytes));
} catch (Exception e)
{
throw new Exception(e);
}
}
/**
* DES算法，解密
*
* @param data 待解密字符串
* @param key 解密私钥，长度不能够小于8位
* @return 解密后的字节数组
* @throws Exception 异常
*/
public static byte[] decode(String key,byte[] data) throws Exception
{
try
{
SecureRandom sr = new SecureRandom();
DESKeySpec dks = new DESKeySpec(key.getBytes());
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
//key的长度不能够小于8位字节
Key secretKey = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
IvParameterSpec iv = new IvParameterSpec(key.getBytes());
AlgorithmParameterSpec paramSpec = iv;
cipher.init(Cipher.DECRYPT_MODE, secretKey,paramSpec);
return cipher.doFinal(data);
} catch (Exception e)
{
throw new Exception(e);
}
}
/**
* 获取编码后的值
* @param key
* @param data
* @return
* @throws Exception
*/
public static String decodeValue(String key,String data)
{
byte[] datas;
String value = null;
try {
datas = decode(key, Base64.decode(data.getBytes()));
value = new String(datas);
} catch (Exception e) {
value = "";
}
return value;
}
public static void main(String[] args) throws Exception
{
System.out.println("明：abcd ；密：" + Main.encode("asdfwef5","abcd"));
}
}
