PHP des 3des加解密
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2024-03-14 13:28:46
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开启Mcrypt扩展,获取mcrypt的加密算法与模式列表:
$cipher_list = mcrypt_list_algorithms();//mcrypt支持的加密算法列表
$mode_list = mcrypt_list_modes(); //mcrypt支持的加密模式列表
echo '<xmp>';
print_r($cipher_list);
print_r($mode_list);
echo '</xmp>';
封装了一个DES加解密的类 适用于MCRYPT_RIJNDAEL_128,3DES算法,PKCS7填充 其它未测
使用时记得更改算法与模式,将其中的MCRYPT_RIJNDAEL_128,MCRYPT_MODE_CBC替换即可
<?php
class StdDes
{
private $key = "";
private $iv = "";
/**
* 构造,传递二个已经进行base64_encode的KEY与IV
*
* @param string $key
* @param string $iv
*/
function __construct($key, $iv)
{
if (empty($key) || empty($iv)) {
echo 'key and iv is not valid';
exit();
}
$this->key = $key;
$this->iv = $iv;
}
/**
*加密
* @param <type> $value
* @return <type>
*/
public function encrypt($value)
{
$td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
$iv = base64_decode($this->iv);
$value = $this->PaddingPKCS7($value);
$key = base64_decode($this->key);
mcrypt_generic_init($td, $key, $iv);
$ret = base64_encode(mcrypt_generic($td, $value));
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $ret;
}
/**
*解密
* @param <type> $value
* @return <type>
*/
public function decrypt($value)
{
$td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
$iv = base64_decode($this->iv);
$key = base64_decode($this->key);
mcrypt_generic_init($td, $key, $iv);
$ret = trim(mdecrypt_generic($td, base64_decode($value)));
$ret = $this->UnPaddingPKCS7($ret);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $ret;
}
private function PaddingPKCS7($data)
{
$block_size = mcrypt_get_block_size('tripledes', 'cbc');
$padding_char = $block_size - (strlen($data) % $block_size);
$data .= str_repeat(chr($padding_char), $padding_char);
return $data;
}
private function UnPaddingPKCS7($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);
}
}
/*
//使用
include('StdDes.class.php');
$key = 'abcdefgh';
$iv = 'abcdefgh';
$msg = 'test string';
$des = new StdDes(base64_encode($key), base64_encode($iv));
$rs1 = $des->encrypt($msg);
echo $rs1 . '<br />';
$rs2 = $des->decrypt($rs1);
echo $rs2;
*/
?>
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