PHP symmetric encryption algorithm (DES/AES) code-PHP Tutorial-php.cn

PHP symmetric encryption algorithm (DES/AES) code

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Release： 2016-07-25 08:43:17

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/**
* Commonly used symmetric encryption algorithms
* Supported keys: 64/128/256 bit (byte length 8/16/32)
* Supported algorithms: DES/AES (automatically matched according to key length: DES: 64bit AES :128/256bit)
* Supported modes: CBC/ECB/OFB/CFB
* Ciphertext encoding: base64 string/hex string/binary string stream
* Padding method: PKCS5Padding (DES)
*
* @author: linvo
* @version: 1.0.0
* @date: 2013/1/10
*/
class Xcrypt{
private $mcrypt;
private $key;
private $mode;
private $iv;
private $blocksize;
/**
* Constructor
*
* @param string key
* @param string mode
* @param string vector ("off": not used / "auto": automatic / other: specified value, the same length as the key)
*/
public function __construct($key, $mode = 'cbc', $iv = "off"){
switch (strlen($key)){
case 8:
$this->mcrypt = MCRYPT_DES;
break;
case 16:
$this->mcrypt = MCRYPT_RIJNDAEL_128;
break;
case 32:
$this->mcrypt = MCRYPT_RIJNDAEL_256;
break;
default:
die("Key size must be 8/16/32");
}
$this->key = $key;
switch (strtolower($mode)){
case 'ofb':
$this->mode = MCRYPT_MODE_OFB;
if ($iv == 'off') die('OFB must give a IV'); //OFB必须有向量
break;
case 'cfb':
$this->mode = MCRYPT_MODE_CFB;
if ($iv == 'off') die('CFB must give a IV'); //CFB必须有向量
break;
case 'ecb':
$this->mode = MCRYPT_MODE_ECB;
$iv = 'off'; //ECB不需要向量
break;
case 'cbc':
default:
$this->mode = MCRYPT_MODE_CBC;
}
switch (strtolower($iv)){
case "off":
$this->iv = null;
break;
case "auto":
$source = PHP_OS=='WINNT' ? MCRYPT_RAND : MCRYPT_DEV_RANDOM;
$this->iv = mcrypt_create_iv(mcrypt_get_block_size($this->mcrypt, $this->mode), $source);
break;
default:
$this->iv = $iv;
}
}
/**
* Get vector value
* @param string vector value encoding (base64/hex/bin)
* @return string vector value
*/
public function getIV($code = 'base64'){
switch ($code){
case 'base64':
$ret = base64_encode($this->iv);
break;
case 'hex':
$ret = bin2hex($this->iv);
break;
case 'bin':
default:
$ret = $this->iv;
}
return $ret;
}
/**
* Encryption
* @param string plain text
* @param string cipher text encoding (base64/hex/bin)
* @return string cipher text
*/
public function encrypt($str, $code = 'base64'){
if ($this->mcrypt == MCRYPT_DES) $str = $this->_pkcs5Pad($str);
if (isset($this->iv)) {
$result = mcrypt_encrypt($this->mcrypt, $this->key, $str, $this->mode, $this->iv);
} else {
@$result = mcrypt_encrypt($this->mcrypt, $this->key, $str, $this->mode);
}
switch ($code){
case 'base64':
$ret = base64_encode($result);
break;
case 'hex':
$ret = bin2hex($result);
break;
case 'bin':
default:
$ret = $result;
}
return $ret;
}
/**
* Decryption
* @param string ciphertext
* @param string ciphertext encoding (base64/hex/bin)
* @return string plaintext
*/
public function decrypt($str, $code = "base64"){
$ret = false;
switch ($code){
case 'base64':
$str = base64_decode($str);
break;
case 'hex':
$str = $this->_hex2bin($str);
break;
case 'bin':
default:
}
if ($str !== false){
if (isset($this->iv)) {
$ret = mcrypt_decrypt($this->mcrypt, $this->key, $str, $this->mode, $this->iv);
} else {
@$ret = mcrypt_decrypt($this->mcrypt, $this->key, $str, $this->mode);
}
if ($this->mcrypt == MCRYPT_DES) $ret = $this->_pkcs5Unpad($ret);
}
return $ret;
}
private function _pkcs5Pad($text){
$this->blocksize = mcrypt_get_block_size($this->mcrypt, $this->mode);
$pad = $this->blocksize - (strlen($text) % $this->blocksize);
return $text . str_repeat(chr($pad), $pad);
}
private function _pkcs5Unpad($text){
$pad = ord($text{strlen($text) - 1});
if ($pad > strlen($text)) return false;
if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) return false;
$ret = substr($text, 0, -1 * $pad);
return $ret;
}
private function _hex2bin($hex = false){
$ret = $hex !== false && preg_match('/^[0-9a-fA-F]+$/i', $hex) ? pack("H*", $hex) : false;
return $ret;
}
}

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使用示例：

header('Content-Type:text/html;Charset=utf-8;');
include "xcrypt.php";

echo '

'; </li>
<li>////////////////////////////////////// </li>
<li>$a = isset($_GET['a']) ? $_GET['a'] : '测试123'; </li>
<li>   </li>
<li>//密钥 </li>
<li>$key = '12345678123456781234567812345678'; //256 bit </li>
<li>$key = '1234567812345678'; //128 bit </li>
<li>$key = '12345678'; //64 bit </li>
<li>   </li>
<li>//设置模式和IV </li>
<li>$m = new Xcrypt($key, 'cbc', 'auto'); </li>
<li>   </li>
<li>//获取向量值 </li>
<li>echo '向量：'; </li>
<li>var_dump($m->getIV()); </li>
<li>   </li>
<li>//加密 </li>
<li>$b = $m->encrypt($a, 'base64'); </li>
<li>//解密 </li>
<li>$c = $m->decrypt($b, 'base64'); </li>
<li>   </li>
<li>echo '加密后：'; </li>
<li>var_dump($b); </li>
<li>echo '解密后：'; </li>
<li>var_dump($c); </li>
<li>   </li>
<li>   </li>
<li>///////////////////////////////////////// </li>
<li>echo '

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php, DES, AES