两组容易的PHP解密解密代码

两组简单的PHP解密解密代码
http://www.phper.org.cn/?post=133
加密算法如下：

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;}

$data = 'PHP加密解密算法';// 被加密信息$key = '123';// 密钥$encrypt = encrypt($data, $key);$decrypt = decrypt($encrypt, $key);echo $encrypt, "\n", $decrypt;

/** * 通用加密 * @param String $string 需要加密的字串 * @param String $skey 加密EKY * @author Anyon Zou <zoujingli@echounion.com> * @date 2013-08-13 19:30 * @return String */ function enCode($string = '', $skey = 'echounion') {    $skey = array_reverse(str_split($skey));    $strArr = str_split(base64_encode($string));    $strCount = count($strArr);    foreach ($skey as $key => $value) {        $key < $strCount && $strArr[$key].=$value;    }    return str_replace('=', 'O0O0O', join('', $strArr)); } /** * 通用解密 * @param String $string 需要解密的字串 * @param String $skey 解密KEY * @return String * @author Anyon Zou <zoujingli@echounion.com> * @date 2013-08-13 19:30 */ function deCode($string = '', $skey = 'echounion') {    $skey = array_reverse(str_split($skey));    $strArr = str_split(str_replace('O0O0O', '=', $string), 2);    $strCount = count($strArr);    foreach ($skey as $key => $value) {        $key < $strCount && $strArr[$key] = rtrim($strArr[$key], $value);    }    return base64_decode(join('', $strArr)); }