PHP custom encryption solution implementation code_PHP tutorial

PHP’s Mcrypt encryption library requires additional settings. Many people directly use the md5() function to encrypt. This method is indeed safe, but because md5 is irreversible encryption, the password cannot be restored, so there are some inconveniences. This article introduces The encryption function supports private keys, which is good to use

The code is as follows

代码如下

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// 说明：PHP 写的加密函数,支持私人密钥   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 "; ?>

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// Description: Encryption function written in PHP, supports private keys

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 = "I am an encrypted character";

// 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 "Encrypted text : $enc_text
";
print "Decrypted text : $dec_text
";
?>

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TechArticlePHP’s Mcrypt encryption library requires additional settings. Many people directly use the md5() function to encrypt. This method It is indeed safe, but because md5 is irreversibly encrypted, the password cannot be restored, so there is also...