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
<?php header("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.'<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".$decrypt_str.'<br>';
效果
原字符是podsmia 加密后的字符是9490E64136137FD8 解密后的字符是podsmia
过了几天,我闲着没事,继续运行一下代码
Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; DES5 has a deprecated constructor in D:\phpstudy_pro\WWW\des\DES5.php on line 2
原字符是podsmia
Fatal error: Uncaught Error: Call to undefined function mcrypt_get_block_size() in D:\phpstudy_pro\WWW\des\DES5.php:19 Stack trace: #0 D:\phpstudy_pro\WWW\des\1.php(10): DES5->encrypt('podsmia') #1 {main} thrown in D:\phpstudy_pro\WWW\des\DES5.php on line 19
给我报了 fatalerror 这不科学啊,我什么都没动啊。怎么回事呢。后面经过一番研究。发现是php版本的问题。我之前运行成功,那是因为我用的 是php5.5,但是这次报错我用的是php7.2.。那么我需要找替代方案。。接下来看我操作
片段2
<?php class DES7 { //要改的加密 public function desEncrypt($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); } }
测试代码
<?php header("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.'<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
原字符是问哪个 加密后的字符是074b8beee21eefca7ec3a60cb8edda18 解密后的字符是问哪个
问题完美解决。大家以后遇到这种问题,直接照搬我的代码即可,方便省事。
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