前言 ：在平時的開發(fā)中，我們經(jīng)常會對關鍵字符進行加密，可能為了安全 也可能為了規(guī)范，今天就將就DES加密正確使用

任務流程圖

片段1

說干就干，我開始編寫des加密類 代碼如下

class DES {     var $key;     var $iv; //偏移量       function DES( $key, $iv=0 ) {         //key長度8例如:1234abcd         $this->key = $key;         if( $iv == 0 ) {             $this->iv = $key;         } else {             $this->iv = $iv; //mcrypt_create_iv ( mcrypt_get_block_size (MCRYPT_DES, MCRYPT_MODE_CBC), MCRYPT_DEV_RANDOM );         }     }       function encrypt($str) {         //加密，返回大寫十六進制字符串         $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, $this->iv ) ) );     }       function decrypt($str) {         //解密         $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 (strspn ( $text, chr ( $pad ), strlen ( $text ) - $pad ) != $pad)             return false;         return substr ( $text, 0, - 1 * $pad );     } }

測試代碼

<?php header("Content-type: text/html; charset=utf-8"); error_reporting(0); require "DES5.php"; // 秘鑰 $key = 'MOxinrui'; $crypt = new DES5($key); $str = 'podsmia'; echo "原字符是".$str.'<br>'; $encrypt_str = $crypt->encrypt($str); echo "加密后的字符是".$encrypt_str.'<br>'; $decrypt_str= $crypt->decrypt($encrypt_str); echo "解密后的字符是".$decrypt_str.'<br>';

效果

原字符是podsmia 加密后的字符是9490E64136137FD8 解密后的字符是podsmia

過了幾天，我閑著沒事，繼續(xù)運行一下代碼

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; DES5 has a deprecated constructor in D:phpstudy_proWWWdesDES5.php on line 2

原字符是podsmia

Fatal error: Uncaught Error: Call to undefined function mcrypt_get_block_size() in D:phpstudy_proWWWdesDES5.php:19 Stack trace: #0 D:phpstudy_proWWWdes1.php(10): DES5->encrypt('podsmia') #1 {main} thrown in D:phpstudy_proWWWdesDES5.php on line 19

給我報了 fatalerror 這不科學啊，我什么都沒動啊。怎么回事呢。后面經(jīng)過一番研究。發(fā)現(xiàn)是php版本的問題。我之前運行成功，那是因為我用的 是php5.5，但是這次報錯我用的是php7.2.。那么我需要找替代方案。。接下來看我操作

片段2

<?php class DES7 {     //要改的加密     public function desEncrypt($str,$key) {         $iv = $key;         $data = openssl_encrypt($str,"DES-CBC",$key,OPENSSL_RAW_DATA,$iv);         $data = strtolower(bin2hex($data));         return $data;     }       //要改的解密     public function desDecrypt($str,$key) {         $iv = $key;         return openssl_decrypt (hex2bin($str), 'DES-CBC', $key, OPENSSL_RAW_DATA,$iv);     } }

測試代碼

<?php header("Content-type: text/html; charset=utf-8"); //error_reporting(0); // 秘鑰 require "DES7.php"; $key = 'MOxinrui'; $crypt = new DES7($key); $str = '問哪個'; echo "原字符是".$str.'<br>'; $encrypt_str = $crypt->desEncrypt($str,$key); echo "加密后的字符是".$encrypt_str.'<br>'; $decrypt_str= $crypt->desDecrypt($encrypt_str,$key); echo "解密后的字符是".$decrypt_str.'<br>';

效果

原字符是問哪個 加密后的字符是074b8beee21eefca7ec3a60cb8edda18 解密后的字符是問哪個

問題完美解決。大家以后遇到這種問題，直接照搬我的代碼即可，方便省事。