代码虚拟的[小代码]在Android和PHP之间的加密/解密,AES加密

题记：写这篇博客要主是加深自己对代码虚拟的的认识和总结实现算法时的一些验经和训教，如果有错误请指出，万分感谢。

Android和PHP上的加、解密字符串。

android上应用：

mcrypt = new MCrypt();
/* 加密*/
String encrypted = MCrypt.bytesToHex( mcrypt.encrypt("需加密的字符") );
/* 解密*/
String decrypted = new String( mcrypt.decrypt( encrypted ) );

PHP上应用：

$mcrypt = new MCrypt();
#Encrypt
$encrypted = $mcrypt->encrypt("需加密的字符");
#Decrypt
$decrypted = $mcrypt->decrypt($encrypted);

android代码：

/***********/
/**JAVA**/

import java.security.NoSuchAlgorithmException;

import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class MCrypt {

private String iv = "fedcba9876543210";//虚拟的 iv (需更改)
private IvParameterSpec ivspec;
private SecretKeySpec keyspec;
private Cipher cipher;

private String SecretKey = "0123456789abcdef";//虚拟的 密钥 (需更改）

public MCrypt()
{
ivspec = new IvParameterSpec(iv.getBytes());

keyspec = new SecretKeySpec(SecretKey.getBytes(), "AES");

try {
cipher = Cipher.getInstance("AES/CBC/NoPadding");
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchPaddingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public byte[] encrypt(String text) throws Exception
{
if(text == null || text.length() == 0)
throw new Exception("Empty string");

byte[] encrypted = null;

try {
cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);

encrypted = cipher.doFinal(padString(text).getBytes());
} catch (Exception e)
{
throw new Exception("[encrypt] " + e.getMessage());
}

return encrypted;
}

public byte[] decrypt(String code) throws Exception
{
if(code == null || code.length() == 0)
throw new Exception("Empty string");

byte[] decrypted = null;

try {
cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);

decrypted = cipher.doFinal(hexToBytes(code));
} catch (Exception e)
{
throw new Exception("[decrypt] " + e.getMessage());
}
return decrypted;
}

public static String bytesToHex(byte[] data)
{
if (data==null)
{
return null;
}

int len = data.length;
String str = "";
for (int i=0; i<len; i++) {
if ((data[i]&0xFF)<16)
str = str + "0" + java.lang.Integer.toHexString(data[i]&0xFF);
else
str = str + java.lang.Integer.toHexString(data[i]&0xFF);
}
return str;
}

public static byte[] hexToBytes(String str) {
if (str==null) {
return null;
} else if (str.length() < 2) {
return null;
} else {
int len = str.length() / 2;
byte[] buffer = new byte[len];
for (int i=0; i<len; i++) {
buffer[i] = (byte) Integer.parseInt(str.substring(i*2,i*2+2),16);
}
return buffer;
}
}

private static String padString(String source)
{
char paddingChar = ' ';
int size = 16;
int x = source.length() % size;
int padLength = size - x;

for (int i = 0; i < padLength; i++)
{
source += paddingChar;
}

return source;
}
}

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PHP代码：

/**********/
/**PHP**/

<?php

class MCrypt
{
private $iv = 'fedcba9876543210'; #和下面JAVA中的一样
private $key = '0123456789abcdef'; #和下面JAVA中的一样

function __construct()
{
}

function encrypt($str) {

//$key = $this->hex2bin($key);
$iv = $this->iv;

$td = mcrypt_module_open('rijndael-128', '', 'cbc', $iv);

mcrypt_generic_init($td, $this->key, $iv);
$encrypted = mcrypt_generic($td, $str);

mcrypt_generic_deinit($td);
mcrypt_module_close($td);

return bin2hex($encrypted);
}

function decrypt($code) {
//$key = $this->hex2bin($key);
$code = $this->hex2bin($code);
$iv = $this->iv;

$td = mcrypt_module_open('rijndael-128', '', 'cbc', $iv);

mcrypt_generic_init($td, $this->key, $iv);
$decrypted = mdecrypt_generic($td, $code);

mcrypt_generic_deinit($td);
mcrypt_module_close($td);

return utf8_encode(trim($decrypted));
}

protected function hex2bin($hexdata) {
$bindata = '';

for ($i = 0; $i < strlen($hexdata); $i += 2) {
$bindata .= chr(hexdec(substr($hexdata, $i, 2)));
}

return $bindata;
}

}

文章结束给大家分享下程序员的一些笑话语录： 这年头的互联网真是娱乐了中国，网民们从各种各样的“门”里钻来钻去，又有好多“哥”好多“帝”，值得大家品味不已……网络经典语录，关于IT与互联网，经典与您分享！