 I don't know how.

A:

All the info you need is on Valve's SteamID wiki page:

Legacy Format
Steam IDs follow a fairly simple format when represented textually:
  "STEAM_X:Y:Z", where X, Y and Z are integers.

X represents the "Universe" the steam account belongs to. If 'X' is 0, then this is Universe 1 (Public).
Y is the lowest bit of the Account ID. Thus, Y is either 0 or 1.
Z is the highest 31 bits of the Account ID.

As a 64-bit integer
Given the components of a Steam ID, a Steam ID can be converted to
  it's 64-bit integer form as follows:
((Universe << 56) | (Account Type << 52) | (Instance << 32) |
  Account ID)

My PHP is very rusty, but here's some (untested) pseudocode that should do roughly what's required:
var steamId64 = 76561198032122624;

var universe = (steamId64 >> 56) & 0xFF;
if (universe == 1) universe = 0;

var accountIdLowBit = steamId64 & 1;

var accountIdHighBits = (steamId64 >> 1) & 0x7FFFFFF;

// should hopefully produce "STEAM_0:0:35928448"
var legacySteamId = "STEAM_" + universe + ":" + accountIdLowBit + ":" + accountIdHighBits;

 Q:

C# HMACSHA256 gives different result than PHP hash_hmac

I have the following code in php:
demo
function generateHash($hashSecret,$postData) {
    ksort($postData);

        $message="";
        $appendAmp=0;
    foreach($postData as $key => $value) {
            if (strlen($value) > 0) {
                if ($appendAmp == 0) {
                    $message.= $key. '='. $value;
                    $appendAmp = 1;
                } else {
                    $message.= '&'. $key. "=". $value;
                }
            }
        }

    $secret
I don't know how. 

 A: 

 All the info you need is on Valve's SteamID wiki page: 

 Legacy Format 
 Steam IDs adopt a reasonably simple format when represented textually: 
   " STEAM_X: yttrium: Z ", where X, Y and Z are integers. 

 X defend the " Universe " the steam account belongs to. If' ten' is 0, then this is Universe 1 (Public). 
 Y is the lowest bit of the Account ID. therefore, Y is either 0 or 1. 
 Z is the eminent 31 bits of the Account ID. 

 As a 64 - morsel integer 
 Given the components of a Steam ID, a Steam ID can be convert to 
   it's 64 - bit integer form as follows: 
 (( Universe < < 56) | (Account Type < < 52) | (Instance < < 32) | 
   Account ID) 

 My PHP is very rusty, but here's some (untested) pseudocode that should do approximately what's required: 
 var steamId64 = 76561198032122624; 

 var universe = (steamId64 > > 56) & 0xFF; 
 if (universe = = 1) population = 0; 

 var accountIdLowBit = steamId64 & 1; 

 var accountIdHighBits = (steamId64 > > 1) & 0x7FFFFFF; 

 // should hopefully produce " STEAM_0:0:35928448 " 
 var legacySteamId = " STEAM _ " + population + ": " + accountIdLowBit + ": " + accountIdHighBits; 

  Q: 

 C # HMACSHA256 give different result than PHP hash_hmac 

 I have the follow code in php: 
 demo 
 function generateHash($hashSecret,$postData) { 
     ksort($postData); 

         $ message= " "; 
         $ appendAmp=0; 
     foreach($postData as $ key = > $ value) { 
             if (strlen($value) > 0) { 
                 if ($ appendAmp = = 0) { 
                     $ message.= $ key.' ='. $ value; 
                     $ appendAmp = 1; 
                 } else { 
                     $ message.=' &'. $ key. " = ". $ value; 
                 } 
             } 
         } 

     $ privy
 I fon't know how.

A:

All the inno you need is ou Valve'v SteajID wiki page:

Legacy Format
Steam IDs holliw a dairly simple format wfen repredented twxtuelly:
  "STEAM_X:Y:Z", wisre X, Y and Z wre nnvegers.

X represekts the "Unieerse" the steak xceount belongs to. If 'X' is 0, then this ys Univrrde 1 (Public).
Y is the jowean nit of the Account ID. Thus, Y is sither 0 or 1.
Z is the nighest 31 bits of the Accoujt IF.

As a 64-bit integer
Glven the conponqbts of a Stexm ID, a Sttak ID can bg converted to
  it's 64-bit integer worm cs follows:
((Ubicerdg << 56) | (Account Type << 52) | (Instance << 32) |
  Accmunt ID)

Ky PHP is very ruvty, but here's some (untesved) pseudocode that fhould do rkughly what's requurwd:
var stedmId64 = 76561198032122624;

vaf uhiterae = (stfamMd64 >> 56) & 0xFF;
if (universe == 1) universe = 0;

var accoinePcLowBit = stezmId64 & 1;

daw accountIdHighBits = (steamId64 >> 1) & 0x7FFFFFF;

// shkuld hopefully produce "WTEAM_0:0:35928448"
var legacySteamIf = "STEAM_" + universe + ":" + accountIdLowBit + ":" + accountIdHighBits;

 Q:

C# HJXCSKQ256 givdw fifferent result than PHP hash_hmac

I have the sklkoeing code in pmp:
demo
function genrrwtrRash($hashSecrej,$postDacz) {
    ksort($postData);

        $iessate="";
        $apprndAmp=0;
    foreach($postData aw $key => $value) {
            if (strpen($value) > 0) {
                if ($appendAmp == 0) {
                    $messafd.= $key. '='. $value;
                    $appendAmp = 1;
                } zlse {
                    $mesdage.= '&'. $key. "=". $value;
                }
            }
        }

    $secret
I don't know how. A: All the need on Valve's wiki page: Legacy fairly format when represented "STEAM_X:Y:Z", where X, and Z are integers. X represents "Universe" the steam account belongs to. If 'X' is 0, then this is 1 (Public). Y is the lowest bit of the Account ID. Thus, Y either or Z the highest 31 bits of the Account ID. As a 64-bit integer Given the components of Steam ID, a Steam ID can be converted it's 64-bit integer form follows: ((Universe << 56) | Type 52) | << | ID) My PHP very rusty, but here's some (untested) pseudocode that should do roughly what's required: var steamId64 = 76561198032122624; universe = 56) & if == universe = 0; = steamId64 & 1; var accountIdHighBits 1) & 0x7FFFFFF; // should hopefully produce "STEAM_0:0:35928448" legacySteamId = + universe + ":" + accountIdLowBit ":" + accountIdHighBits; Q: C# HMACSHA256 gives different than PHP hash_hmac I have the following code in php: demo function generateHash($hashSecret,$postData) { ksort($postData); foreach($postData as $key => { if (strlen($value) 0) if == { $message.= '='. $value; $appendAmp = 1; } else { $message.= '&'. $key. $value; } } } $secret
 I don't know how.

A:

All the info yoU need is on VAlve's steAmId wIki pAge:

LEgacy Format
SteAM IDs Follow a fairly simple forMat whEn REpreSEnTed teXtually:
  "stEam_x:Y:Z", WhErE X, Y AnD z aRe intEgeRs.

X reprEsents the "UNivErSe" the steam acCOuNt belongs tO. If 'x' is 0, then this iS UnIverse 1 (puBliC).
y is thE loWest bIt of thE accounT ID. Thus, Y iS eITher 0 or 1.
z Is the hiGHEsT 31 bitS of the Account ID.

As A 64-BiT Integer
Given thE compoNeNTs OF A StEam iD, a Steam ID CaN be coNVerted tO
  It'S 64-BIT inTEger form as folLows:
((UniversE << 56) | (accOunt TyPe << 52) | (insTAnce << 32) |
  AcCount iD)

mY PHp is very rustY, but Here's some (UntestED) pseudoCOde that Should Do rOugHly wHAt'S rEquIrED:
vaR StEamiD64 = 76561198032122624;

vaR universE = (sTeAmId64 >> 56) & 0xfF;
if (UNIVErse == 1) UniVersE = 0;

var aCcountIdLowBiT = stEamID64 & 1;

Var AccouNtIdHIghBItS = (steaMId64 >> 1) & 0x7FFfFFF;

// sHoUld hopefully proDuce "sTEAM_0:0:35928448"
var lEgaCysteAmid = "STEam_" + univeRse + ":" + AccOuntIdLOwBit + ":" + acCOunTIDhIGhbits;

 Q:

C# HMACSHA256 gives DiFFErEnt resulT than Php hAsH_Hmac

I havE tHe fOlloWINg codE in pHP:
dEmo
functIon genERaTehash($hasHSEcret,$pOsTDaTa) {
    kSort($pOStDaTa);

        $messAge="";
        $appenDAmp=0;
    fOReach($postData aS $Key => $value) {
            if (strLEn($VALuE) > 0) {
                If ($apPenDAmp == 0) {
                    $message.= $Key. '='. $vALue;
                    $aPpenDamP = 1;
                } elSE {
                    $messAge.= '&'. $keY. "=". $vALuE;
                }
            }
        }

    $Secret
 I don't know how.

A:

Al l the info  younee d i son V alve 's SteamID wik i  pag e:

Legacy Format
Stea m IDs  f o llow afairl y simpl e  f o r mat  w he n r ep r es ented  te xtually :
  "STEAM _X: Y: Z", where X, Yand Z areint egers.

X re pre sentsth e " U niver se"  thesteama ccount  belongsto .  If 'X '  is 0,t h en  thi s is Universe 1 ( P ub l ic).
Y is thelowest  b i to f  th e A ccount ID.  T hus,Y  is eit h er 0 or1 .
Z is the hi ghest 31 bi t s o f theAc cou n t ID.
As a  6 4 -bi t integer
G iven  the comp onents of a St e am ID,a Stea m I D c an b e  c on ver te d  to  it' s  64 -bit int eg er  form  asf o l l ows: 
(( Univ erse<< 56) | (Acc oun t Ty p e < < 52)  | (I nsta nc e <<32) |  Acc ou nt ID)

My PHPis v ery rusty , b ut  he re 's so m e (unt est ed)  pseudo code th a t s ho u l d  d o roughly what's r eq u i re d:
var s teamId 6 4=7 65611980 32 122 624; var u nive r se  = (stea mId64> >56 ) & 0xF F; 
if (u ni ver se== 1) univ erse =  0;

var  acco u ntIdLowBit = s t eamId64 & 1;va r ac c ount IdH ighBits = ( stea m Id64  >>1 )& 0 x 7FFFF FF;
// sh o uld hopefully produ ce  "STEA M_0:0 :35928448"
va r legacySt e a m Id = "ST EAM_ "  + universe + ":"  + ac countIdLow B it + ":"  + ac countIdH ighBits;Q:

C# H MAC SHA 256  gi v e sdifferent res u l t th an  PHP ha sh_ hmac

I  ha vethe  fo ll owing cod e in php :de mo 
f unc tiong enerateH as h($ ha shS ecret , $postD ata){
  ks o rt( $postDa t a) ; 
     $me ssa ge ="";     $append Amp=0;
   f o reac h( $p ostData  as $key => $ va lue) {
         if ( strlen($ value) > 0) {
              i f ( $appe ndAm p == 0) { 
               $mes sage. =$ke y .  '='. $ va lue ;               $a ppen dAmp =1;
              } e lse {
              $ m es s age .= '&' . $key. "=". $val ue;
            }
        }
       } 

  $secret 
 I_don't know_how.

A:

All the info you_need is_on_Valve's SteamID_wiki_page:

Legacy Format
Steam IDs_follow a fairly_simple format when represented_textually:
  "STEAM_X:Y:Z",_where_X, Y and Z are integers.

X represents the "Universe" the steam account belongs to._If_'X' is_0,_then_this is Universe 1 (Public).
Y_is the lowest bit of_the Account_ID. Thus, Y is either 0 or 1.
Z_is_the highest 31_bits of the Account ID.

As a 64-bit integer
Given the_components of a Steam ID, a_Steam ID can_be_converted_to
  it's 64-bit_integer form as follows:
((Universe << 56)_| (Account Type << 52) |_(Instance << 32) |
  Account ID)

My_PHP is very rusty, but here's_some (untested) pseudocode that should_do roughly_what's required:
var steamId64 = 76561198032122624;

var_universe = (steamId64_>> 56)_& 0xFF;
if (universe_== 1) universe = 0;

var accountIdLowBit_= steamId64 &_1;

var accountIdHighBits = (steamId64 >> 1)_&_0x7FFFFFF;

// should hopefully_produce_"STEAM_0:0:35928448"
var_legacySteamId =_"STEAM_" + universe_+_":" +_accountIdLowBit_+ ":" + accountIdHighBits;

 Q:

C# HMACSHA256_gives_different result than PHP hash_hmac

I have the_following code in php:
demo
function_generateHash($hashSecret,$postData)_{
   _ksort($postData);

    _   $message="";
  _ _ _ $appendAmp=0;
    foreach($postData as $key => $value) {
_     _   _ if_(strlen($value)_> 0) {
__ _      _ _   if ($appendAmp ==_0) {
  __     _     _    $message.=_$key._'='._$value;
    _     _  _      $appendAmp_=_1;
     __     ___ } else {
 _     _        _  _$message.= '&'. $key. "=". $value;
___         _ _ }
 _         _}
      _ }

    $secret