PHP custom encryption and decryption implementation code_PHP tutorial

The article introduces PHP custom encryption and decryption. Many friends use PHP’s own encryption. What will happen if we write our own one? Let’s look at the code below.

代码如下

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// 说明：PHP 写的加密函数,支持私人密钥 // 整理：http://www.bKjia.c0m function keyED($txt,$encrypt_key) { $encrypt_key = md5($encrypt_key); $ctr=0; $tmp = ""; for ($i=0;$i { if ($ctr==strlen($encrypt_key)) $ctr=0; $tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1); $ctr++; } return $tmp; } function encrypt($txt,$key) { srand((double)microtime()*1000000); $encrypt_key = md5(rand(0,32000)); $ctr=0; $tmp = ""; for ($i=0;$i { if ($ctr==strlen($encrypt_key)) $ctr=0; $tmp.= substr($encrypt_key,$ctr,1) . (substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1)); $ctr++; } return keyED($tmp,$key); } function decrypt($txt,$key) { $txt = keyED($txt,$key); $tmp = ""; for ($i=0;$i { $md5 = substr($txt,$i,1); $i++; $tmp.= (substr($txt,$i,1) ^ $md5); } return $tmp; } $key = "YITU.org"; $string = "我是加密字符"; // encrypt $string, and store it in $enc_text $enc_text = encrypt($string,$key); // decrypt the encrypted text $enc_text, and store it in $dec_text $dec_text = decrypt($enc_text,$key); print "加密的 text : $enc_text "; print "解密的 text : $dec_text "; ?>

http://www.bkjia.com/PHPjc/629685.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/629685.htmlTechArticleThe article introduces about PHP custom encryption and decryption. Many friends use PHP to bring it. If we write it ourselves What will happen? Let’s look at the code below. The code is as follows Copy code ?php // Say...