前言 :在平時的開發中,我們經常會對關鍵字符進行加密,可能爲了安全 也可能爲了規範,今天就將就DES加密正確使用
任務流程圖
片段1
說幹就幹,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";
// 祕鑰
$key = 'MOxinrui';
$crypt = new DES5($key);
$str = 'podsmia';
echo "原字符是".$str.'<br>';
$encrypt_str = $crypt->encrypt($str);
echo "加密後的字符是".$encrypt_str.'<br>';
$decrypt_str= $crypt->decrypt($encrypt_str);
echo "解密後的字符是".$decrypt_str.'<br>';
效果
原字符是podsmia
加密後的字符是9490E64136137FD8
解密後的字符是podsmia
過了幾天,我閒着沒事,繼續運行一下代碼
Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; DES5 has a deprecated constructor in D:\phpstudy_pro\WWW\des\DES5.php on line 2
原字符是podsmia
Fatal error: Uncaught Error: Call to undefined function mcrypt_get_block_size() in D:\phpstudy_pro\WWW\des\DES5.php:19 Stack trace: #0 D:\phpstudy_pro\WWW\des\1.php(10): DES5->encrypt('podsmia') #1 {main} thrown in D:\phpstudy_pro\WWW\des\DES5.php on line 19
給我報了 fatalerror 這不科學啊,我什麼都沒動啊。怎麼回事呢。後面經過一番研究,。發現是php版本的問題。我之前運行成功,那是因爲我用的 是php5.5,,但是這次報錯我用的是php7.2.。那麼我需要找替代方案。。接下來看我操作
片段2
<?php
class DES7
{
//要改的加密
public function desEncrypt($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);
// 祕鑰
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,$key);
echo "加密後的字符是".$encrypt_str.'<br>';
$decrypt_str= $crypt->desDecrypt($encrypt_str,$key);
echo "解密後的字符是".$decrypt_str.'<br>';
效果圖
原字符是問哪個
加密後的字符是074b8beee21eefca7ec3a60cb8edda18
解密後的字符是問哪個
問題完美解決。大家以後遇到這種問題,直接照搬我的代碼即可,方便省事。