php 字串加密

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<?php//字串加密函數針對UTF8字串function StrEncryptR4($str_text,$str_passwd,$enlevel=4){if($str_text=='' || $str_passwd=='') return $str_text;if($enlevel<=0) $enlevel = 1;$text = '';$stlen = strlen($str_text);$splen = strlen($str_passwd);for($i=0;$i<$enlevel;$i++){for($j=0;$j<$stlen;$j++){$text .= chr(ord(substr($str_text,$j,1)) ^ ord(substr($str_passwd,($j % $splen),1)));}}$ai_encryptbox = array();for($i=0;$i<256;$i++){$ai_encryptbox[] = array($i,ord(substr($str_passwd,($i % $splen),1)));}$j = 0;$m = 0;for($i=0;$i<256;$i++){$j = ($j + $ai_encryptbox[$i][0] + $ai_encryptbox[$i][1]) % 256;$m = $ai_encryptbox[$i][0];$ai_encryptbox[$i][0] = $ai_encryptbox[$j][0];$ai_encryptbox[$j][0] = $m;}$j = 0;$m = 0;$n = 0;$str_text = $text;$text = '';for($i=0;$i<$stlen;$i++){$j = ($j + 1) % 256;$m = ($m + $ai_encryptbox[$j][0]) % 256;$n = $ai_encryptbox[($ai_encryptbox[$j][0] + $ai_encryptbox[$m][0]) % 256][0];//$c = dechex(ord(substr($str_text,$i,1)) ^ $n);//$text .= strlen($c)==1 ? '0'.$c : $c;$text .= chr(ord(substr($str_text,$i,1)) ^ $n);}return base64_encode($text);}function StrDecryptR4 ($str_text,$str_passwd,$enlevel = 4){}//end of file

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