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发表于 2011-12-23 01:12 |只看该作者 |倒序浏览

<?php
/**
* PHP版3DES加解密类
* 可与java的3DES(DESede/CBC/PKCS5Padding)加密方式兼容
*/
class Crypt3Des {
var $key;
var $iv;
function Crypt3Des($key, $iv){
$this->key = $key;
$this->iv = $iv;
}
function encrypt($input){
$size = mcrypt_get_block_size(MCRYPT_3DES,MCRYPT_MODE_CBC);
$input = $this->pkcs5_pad($input, $size);
$key = str_pad($this->key,24,'0');
$td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');
if( $this->iv == '' )
{
$iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
}
else
{
$iv = $this->iv;
}
@mcrypt_generic_init($td, $key, $iv);
$data = mcrypt_generic($td, $input);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
$data = base64_encode($data);
return $data;
}
function decrypt($encrypted){
$encrypted = base64_decode($encrypted);
$key = str_pad($this->key,24,'0');
$td = mcrypt_module_open(MCRYPT_3DES,'',MCRYPT_MODE_CBC,'');
if( $this->iv == '' )
{
$iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
}
else
{
$iv = $this->iv;
}
$ks = mcrypt_enc_get_key_size($td);
@mcrypt_generic_init($td, $key, $iv);
$decrypted = mdecrypt_generic($td, $encrypted);
mcrypt_generic_deinit($td);
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 * $pad);
}
function PaddingPKCS7($data) {
$block_size = mcrypt_get_block_size(MCRYPT_3DES, MCRYPT_MODE_CBC);
$padding_char = $block_size - (strlen($data) % $block_size);
$data .= str_repeat(chr($padding_char),$padding_char);
return $data;
}
}
$des = new Crypt3Des("123456788765432","12345678");
echo $ret = $des->encrypt("sjfalfjaljfajflasjflaf");
?>

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