事情是这样的,我想把用于base64加密后的字符串用于url传输
众所周知,base64中有三个特殊字符:"/,+,=",其中,=是补位码,/和+的标准字符,但/和=在URL里有着特定的意义
如果放到URL里,可能会被当成其他功能进行处理 。
于是我的做法如下,我现在相请教大家的是有没有什么特殊情况我没有考虑进去,导致解密或者加密失败吗?function dzCode($string,$operation,$key="3718247")
{
/**
*@return String 加密或解密字符串
*@param String $string 待加密或解密字符串
*@param String $operation 操作类型定义 DECODE=解密 ENDODE=加密
*@param String $key 加密算子
*/
if($operation == "DECODE")
{
$string = str_replace( array(":","|",";"), array("/","+","="), $string);
}
$key = md5($key);
$key_length = strlen($key);
$string = $operation == 'DECODE' ? base64_decode($string) : substr(md5($string.$key), 0, 8).$string;
$string_length = strlen($string);
$rndkey = $box = array();
$result = '';
for($i = 0; $i <= 255; $i++) {
$rndkey[$i] = ord($key[$i % $key_length]);
$box[$i] = $i;
}
for($j = $i = 0; $i < 256; $i++) {
$j = ($j + $box[$i] + $rndkey[$i]) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
}
for($a = $j = $i = 0; $i < $string_length; $i++) {
$a = ($a + 1) % 256;
$j = ($j + $box[$a]) % 256;
$tmp = $box[$a];
$box[$a] = $box[$j];
$box[$j] = $tmp;
$result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
}
if($operation == 'DECODE')//解密
{
if(substr($result, 0, 8) == substr(md5(substr($result, 8).$key), 0, 8)) {
return substr($result, 8);
} else {
return '';
}
}
else//加密
{
$string = str_replace('=', '', base64_encode($result));
return str_replace( array("/","+","="), array(":","|",";"), $string);
}
}
众所周知,base64中有三个特殊字符:"/,+,=",其中,=是补位码,/和+的标准字符,但/和=在URL里有着特定的意义
如果放到URL里,可能会被当成其他功能进行处理 。
于是我的做法如下,我现在相请教大家的是有没有什么特殊情况我没有考虑进去,导致解密或者加密失败吗?function dzCode($string,$operation,$key="3718247")
{
/**
*@return String 加密或解密字符串
*@param String $string 待加密或解密字符串
*@param String $operation 操作类型定义 DECODE=解密 ENDODE=加密
*@param String $key 加密算子
*/
if($operation == "DECODE")
{
$string = str_replace( array(":","|",";"), array("/","+","="), $string);
}
$key = md5($key);
$key_length = strlen($key);
$string = $operation == 'DECODE' ? base64_decode($string) : substr(md5($string.$key), 0, 8).$string;
$string_length = strlen($string);
$rndkey = $box = array();
$result = '';
for($i = 0; $i <= 255; $i++) {
$rndkey[$i] = ord($key[$i % $key_length]);
$box[$i] = $i;
}
for($j = $i = 0; $i < 256; $i++) {
$j = ($j + $box[$i] + $rndkey[$i]) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
}
for($a = $j = $i = 0; $i < $string_length; $i++) {
$a = ($a + 1) % 256;
$j = ($j + $box[$a]) % 256;
$tmp = $box[$a];
$box[$a] = $box[$j];
$box[$j] = $tmp;
$result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
}
if($operation == 'DECODE')//解密
{
if(substr($result, 0, 8) == substr(md5(substr($result, 8).$key), 0, 8)) {
return substr($result, 8);
} else {
return '';
}
}
else//加密
{
$string = str_replace('=', '', base64_encode($result));
return str_replace( array("/","+","="), array(":","|",";"), $string);
}
}
dz7.2的authcode()函数的代码;
function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) { $ckey_length = 4;
$key = md5($key ? $key : $GLOBALS['discuz_auth_key']);
$keya = md5(substr($key, 0, 16));
$keyb = md5(substr($key, 16, 16));
$keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : ''; $cryptkey = $keya.md5($keya.$keyc);
$key_length = strlen($cryptkey); $string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0).substr(md5($string.$keyb), 0, 16).$string;
$string_length = strlen($string); $result = '';
$box = range(0, 255); $rndkey = array();
for($i = 0; $i <= 255; $i++) {
$rndkey[$i] = ord($cryptkey[$i % $key_length]);
} for($j = $i = 0; $i < 256; $i++) {
$j = ($j + $box[$i] + $rndkey[$i]) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
} for($a = $j = $i = 0; $i < $string_length; $i++) {
$a = ($a + 1) % 256;
$j = ($j + $box[$a]) % 256;
$tmp = $box[$a];
$box[$a] = $box[$j];
$box[$j] = $tmp;
$result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
} if($operation == 'DECODE') {
if((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {
return substr($result, 26);
} else {
return '';
}
} else {
return $keyc.str_replace('=', '', base64_encode($result));
}}