本文執行個體講述了php結合md5的加密解密演算法。分享給大家供大家參考,具體如下:
<?php/** Created on 2016-9-30**/function encrypt($data, $key){ $key = md5($key); $x = 0; $len = strlen($data); $l = strlen($key); for ($i = 0; $i < $len; $i++) { if ($x == $l) { $x = 0; } $char .= $key{$x}; $x++; } for ($i = 0; $i < $len; $i++) { $str .= chr(ord($data{$i}) + (ord($char{$i})) % 256); } return base64_encode($str);}function decrypt($data, $key){ $key = md5($key); $x = 0; $data = base64_decode($data); $len = strlen($data); $l = strlen($key); for ($i = 0; $i < $len; $i++) { if ($x == $l) { $x = 0; } $char .= substr($key, $x, 1); $x++; } for ($i = 0; $i < $len; $i++) { if (ord(substr($data, $i, 1)) < ord(substr($char, $i, 1))) { $str .= chr((ord(substr($data, $i, 1)) + 256) - ord(substr($char, $i, 1))); } else { $str .= chr(ord(substr($data, $i, 1)) - ord(substr($char, $i, 1))); } } return $str;}$data = '中文網www.php.cn'; // 被加密資訊$data=iconv("gbk","utf-8",$data);$key = 'www.jb51.net'; // 密鑰$encrypt = encrypt($data, $key);$decrypt = decrypt($encrypt, $key);echo $encrypt, "<br/>", $decrypt;?>
運行結果如下:
TrXMTM8SFB3DGhTr2qeuYqOXZmpmn8mo中文網www.php.cn
希望本文所述對大家PHP程式設計有所協助。