PHP Encryption and decryption method

<?php
Can be used for encryption and decryption, such as cookies, accounts, mobile phone number as so Onclass Des{var $key; var $iv;//Offset function __construct ($key, $iv =0) {//key length 8 for example: 1234ABCD $this->key = $key, if ($iv = = 0) {$this->iv = $key;//default $key as IV} else {$this->iv = $iv;//mcrypt_create_iv ( Mcrypt_get_block_size (Mcrypt_des, MCRYPT_MODE_CBC), mcrypt_dev_random);}} function Encrypt ($STR) {//encryption, return uppercase hexadecimal string $size = Mcrypt_get_block_size (Mcrypt_des, MCRYPT_MODE_CBC); $str = $this Pkcs5pad ($str, $size); return Strtoupper (Bin2Hex (MCRYPT_CBC (mcrypt_des, $this->key, $str, Mcrypt_encrypt, $this-&G T;IV)));} function Decrypt ($STR) {//Decrypt $strbin = $this->hex2bin (strtolower ($STR)); $str = MCRYPT_CBC (mcrypt_des, $this->key , $strBin, Mcrypt_decrypt, $this->iv) $str = $this->pkcs5unpad ($str); return $str;} function Hex2bin ($hexData) {$binData = ""; for ($i = 0; $i < strlen ($hexData); $i + = 2) {$binData. = Chr (Hexdec (substr ($hexData, $i, 2)));} return $binData;} function Pkcs5pad ($text, $blocksize) {$pad = $bLocksize-(strlen ($text)% $blocksize); return $text. Str_repeat (Chr ($pad), $pad);} function Pkcs5unpad ($text) {$pad = Ord ($text {strlen ($text)-1}), if ($pad > strlen ($text)) return False;if (St RSPN ($text, Chr ($pad), strlen ($text)-$pad)! = $pad) return False;return substr ($text, 0,-1 * $pad);}} Instantiate, and pass in two parameters, all 8 bits, i.e. KEY, vi value $des = new des (' abcd1234 ', ' 87654321 ');//encryption result $AA = 7a3c7bba8b42adc4$str = ' 123456 '; $aa = $ Des->encrypt ($STR); echo $aa;//decryption results $BB 123456$BB = $des->decrypt ($AA); Echo $bb; >

　　

PHP Encryption and decryption method