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Changed and simplified ID obfuscation algoritm. Sorry about that

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adolfintel 2019-02-14 17:04:01 +01:00
parent 0c4dbe5ca4
commit 78c0190618
1 changed files with 11 additions and 8 deletions
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19
telemetry/idObfuscation.php
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@ -18,22 +18,25 @@ function getObfuscationSalt(){
This is a simple reversible hash function I made for encoding and decoding test IDs. This is a simple reversible hash function I made for encoding and decoding test IDs.
It is not cryptographically secure, don't use it to hash passwords or something! It is not cryptographically secure, don't use it to hash passwords or something!
*/ */
function obfdeobf($id){ function obfdeobf($id,$dec){
$salt=getObfuscationSalt()&0xFFFFFFFF; $salt=getObfuscationSalt()&0xFFFFFFFF;
$id=$id&0xFFFFFFFF; $id=$id&0xFFFFFFFF;
for($i=0;$i<16;$i++){ if($dec){
$id=$id^$salt; $id=$id^$salt;
$salt=(($salt>>1)&0xFFFFFFFF)|(($salt&0x00000001)<<31); $id=(($id&0xAAAAAAAA)>>1)|($id&0x55555555)<<1;
$id=((0x0000FFFF&$id)<<16)|((0xFFFF0000&$id)>>16); $id=(($id&0x0000FFFF)<<16)|(($id&0xFFFF0000)>>16);
$id=(($id>>1)&0xFFFFFFFF)|(($id&0x00000001)<<31); return $id;
}else{
$id=(($id&0x0000FFFF)<<16)|(($id&0xFFFF0000)>>16);
$id=(($id&0xAAAAAAAA)>>1)|($id&0x55555555)<<1;
return $id^$salt;
} }
return $id;
} }
function obfuscateId($id){ function obfuscateId($id){
return str_pad(base_convert(obfdeobf($id+1),10,36),7,0,STR_PAD_LEFT); return str_pad(base_convert(obfdeobf($id+1,false),10,36),7,0,STR_PAD_LEFT);
} }
function deobfuscateId($id){ function deobfuscateId($id){
return obfdeobf(base_convert($id,36,10))-1; return obfdeobf(base_convert($id,36,10),true)-1;
} }
//IMPORTANT: DO NOT ADD ANYTHING BELOW THE PHP CLOSING TAG, NOT EVEN EMPTY LINES! //IMPORTANT: DO NOT ADD ANYTHING BELOW THE PHP CLOSING TAG, NOT EVEN EMPTY LINES!