Added async modPow worker

app/js/lib/bin_utils.js

@@ -516,3 +516,17 @@ function pqPrimeLeemon (what) {
 
   return [bytesFromLeemonBigInt(P), bytesFromLeemonBigInt(Q), it];
 }
+
+
+function bytesModPow (x, y, m) {
+  try {
+    var xBigInt = str2bigInt(x, 64),
+        yBigInt = str2bigInt(y, 64),
+        mBigInt = str2bigInt(bytesToHex(m), 16, 2),
+        resBigInt = powMod(xBigInt, yBigInt, mBigInt);
+
+    return bytesFromHex(bigInt2str(resBigInt, 16));
+  } catch (e) {}
+
+  return bytesFromBigInt(new BigInteger(x).modPow(new BigInteger(y), new BigInteger(m)));
+}

app/js/lib/mp_worker.js

@@ -0,0 +1,17 @@
+/*!
+ * Webogram v0.2 - messaging web application for MTProto
+ * https://github.com/zhukov/webogram
+ * Copyright (C) 2014 Igor Zhukov <igor.beatle@gmail.com>
+ * https://github.com/zhukov/webogram/blob/master/LICENSE
+ */
+
+importScripts(
+  '../../vendor/console-polyfill/console-polyfill.js',
+  'bin_utils.js',
+  '../../vendor/leemon_bigint/bigint.js',
+  '../../vendor/jsbn/jsbn_combined.js'
+);
+
+onmessage = function (e) {
+  postMessage(bytesModPow(e.data[0], e.data[1], e.data[2]));
+}

app/js/lib/mtproto.js

@@ -85,9 +85,7 @@ angular.module('izhukov.mtproto', ['izhukov.utils'])
       var fingerprintBytes = sha1Hash(buffer).slice(-8);
       fingerprintBytes.reverse();
 
-      var fingerprint = new BigInteger(fingerprintBytes).toString(16);
-
-      publicKeysParsed[fingerprint] = {
+      publicKeysParsed[bytesToHex(fingerprintBytes)] = {
         modulus: keyParsed.modulus,
         exponent: keyParsed.exponent
       };
@@ -404,16 +402,38 @@ angular.module('izhukov.mtproto', ['izhukov.utils'])
     MtpMessageIdGenerator.applyServerTime(auth.serverTime, auth.localTime);
   };
 
+  function mtpAsyncModPow (x, y, m) {
+    console.log(dT(), 'modPow start');
+    if (!window.Worker) {
+      var result = bytesModPow(x, y, m);
+      console.log(dT(), 'sync modPow done');
+      return $q.when(result);
+    }
+
+    var deferred = $q.defer(),
+        worker = new Worker('js/lib/mp_worker.js');
+
+    worker.onmessage = function (e) {
+      console.log(dT(), 'async modPow done');
+      deferred.resolve(e.data);
+    };
+    worker.onerror = function(error) {
+      console.log('Worker error', error, error.stack);
+      deferred.reject(error);
+    };
+    worker.postMessage([x, y, m]);
+
+    return deferred.promise;
+  }
+
   function mtpSendSetClientDhParams(auth) {
-    var deferred = auth.deferred;
+    var deferred = auth.deferred,
+        gBytes = bytesFromHex(auth.g.toString(16));
 
     auth.b = new Array(256);
     MtpSecureRandom.nextBytes(auth.b);
 
-    var bBigInt = new BigInteger(auth.b);
-    var dhPrimeBigInt = new BigInteger(auth.dhPrime);
-
-    var gB = bytesFromBigInt(bigint(auth.g).modPow(bBigInt, dhPrimeBigInt));
+    mtpAsyncModPow(gBytes, auth.b, auth.dhPrime).then(function (gB) {
 
       var data = new TLSerialization({mtproto: true});
       data.storeObject({
@@ -455,11 +475,8 @@ angular.module('izhukov.mtproto', ['izhukov.utils'])
           return false;
         }
 
-      var bBigInt = new BigInteger(auth.b);
-      var dhPrimeBigInt = new BigInteger(auth.dhPrime);
-
-      var authKey =  bytesFromBigInt((new BigInteger(auth.gA)).modPow(bBigInt, dhPrimeBigInt)),
-          authKeyHash = sha1Hash(authKey),
+        mtpAsyncModPow(auth.gA, auth.b, auth.dhPrime).then(function (authKey) {
+          var authKeyHash = sha1Hash(authKey),
               authKeyAux  = authKeyHash.slice(0, 8),
               authKeyID   = authKeyHash.slice(-8);
 
@@ -502,10 +519,15 @@ angular.module('izhukov.mtproto', ['izhukov.utils'])
               deferred.reject(new Error('Set_client_DH_params_answer fail'));
               return false;
           }
-
+        }, function (error) {
+          deferred.reject(error);
+        })
       }, function (error) {
         deferred.reject(error);
       });
+    }, function (error) {
+      deferred.reject(error);
+    })
   };
 
   var cached = {};