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DES加密php版本

日期:2011-07-05  点击率:1040


<?php
$key = "eddadfdfsdf";
  $input = 'wenhaodfdfdkferfdffskaladfdfdafadjdfdf';
  $crypt = new DES($key);
  echo "Encode:".$crypt->encrypt($input)."<br/>";
  echo "Decode:".$crypt->decrypt($crypt->encrypt($input));



class DES {
var $key;
function DES($key) {
$this->key = $key;
}
function encrypt($input) {
$size = mcrypt_get_block_size('des', 'ecb');
$input = $this->pkcs5_pad($input, $size);
$key = $this->key;
$td = mcrypt_module_open('des', '', 'ecb', '');
$iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
@mcrypt_generic_init($td, $key, $iv);
$data = mcrypt_generic($td, $input);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
$data = bin2hex($data);
return $data;
}
function decrypt($encrypted) {
$encrypted = pack('H*', $encrypted);
$key =$this->key;
$td = mcrypt_module_open('des','','ecb','');
//使用MCRYPT_DES算法,cbc模式
$iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
$ks = mcrypt_enc_get_key_size($td);
@mcrypt_generic_init($td, $key, $iv);
//初始处理
$decrypted = mdecrypt_generic($td, $encrypted);
//解密
mcrypt_generic_deinit($td);
//结束
mcrypt_module_close($td);
$y=$this->pkcs5_unpad($decrypted);
return $y;
}
function pkcs5_pad ($text, $blocksize) {
$pad = $blocksize - (strlen($text) % $blocksize);
return $text . str_repeat(chr($pad), $pad);
}
function pkcs5_unpad($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);
}
}



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