php中DES加密解密的使用方法

2025-02-18 技术教程

前言：在平时的开发中，我们经常会对关键字符进行加密，可能为了安全也可能为了规范，今天就将就DES加密正确使用

任务流程图

片段1

说干就干，我开始编写des加密类代码如下

class DES{ var $key; var $iv; //偏移量 function DES( $key, $iv=0 ) { //key长度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，返回大写十六进制字符串 $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 ); }}

测试代码

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

效果

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

过了几天，我闲着没事，继续运行一下代码

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_pro\WWW\des\DES5.php on line 2

原字符是podsmia

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

给我报了 fatalerror 这不科学啊，我什么都没动啊。怎么回事呢。后面经过一番研究。发现是php版本的问题。我之前运行成功，那是因为我用的是php5.5，但是这次报错我用的是php7.2.。那么我需要找替代方案。。接下来看我操作

片段2

<?phpclass 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); }}

测试代码

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

效果

原字符是问哪个加密后的字符是074b8beee21eefca7ec3a60cb8edda18解密后的字符是问哪个

以上就是php中加密解密DES的正确使用姿势的详细内容，更多请关注亿速云其它相关文章！