3des加密_PHP_编程开发_程序员俱乐部

?

?encrypt_class.php//文件名

<?php
class Crypt3Des {
?public $key = "XXXXXXXXXXXXXXXXX";//这个根据实际情况写
function Crypt3Des($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~！@