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9490E136137FD8
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_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

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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