3des encryption

 

 encrypt_class.php//File name

<?php
class Crypt3Des {
 public $key = " XXXXXXXXXXXXXXXXX ";//This is written according to the actual situation
function Crypt3Des($key){

$this->key=$key;

}

 function encrypt($input){//数据加密
 $size = mcrypt_get_block_size(MCRYPT_3DES,'ecb');
 $input = $this->pkcs5_pad($input, $size);
 $key = str_pad($this->key,24,'0');
 $td = mcrypt_module_open(MCRYPT_3DES, '', '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);
 //    $data = base64_encode($this->PaddingPKCS7($data));
 $data = base64_encode($data);
 return $data;
 }

 

 function decrypt($encrypted){//数据解密
 $encrypted = base64_decode($encrypted);
 $key = str_pad($this->key,24,'0');
 $td = mcrypt_module_open(MCRYPT_3DES,'','ecb','');
 $iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td),MCRYPT_RAND);
 $ks = mcrypt_enc_get_key_size($td);
 @mcrypt_generic_init($td, $key, $iv);
 $decrypted = mdecrypt_generic($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;
 }
}

 $rep=new Crypt3Des();//初始化一个对象
 $input="hello world";
 echo "原文：".$input."<br/>";
 $encrypt_card=$rep->encrypt($input);
 echo "加密：".$encrypt_card."<br/>";
 echo "解密：".$rep->decrypt($rep->encrypt($input));

?>

 

这是一个非常有用的3des加密，在多数情况下可以直接拿来用。很不错哦~！@