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The example in this article describes the encryption and decryption algorithm of php combined with md5. Share it with everyone for your reference, the details are as follows:
<?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 = '中文网www.php.cn'; // 被加密信息 $data=iconv("gbk","utf-8",$data); $key = 'www.jb51.net'; // 密钥 $encrypt = encrypt($data, $key); $decrypt = decrypt($encrypt, $key); echo $encrypt, "<br/>", $decrypt; ?>
The running results are as follows:
TrXMTM8SFB3DGhTr2qeuYqOXZmpmn8mo 中文网www.php.cn
I hope this article will be helpful to everyone in PHP programming.
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