Fix setting up 2FA

.env

@@ -1,5 +1,5 @@
 API_ID=1025907
 API_HASH=452b0359b988148995f22ff0f4229750
 VERSION=0.9.1
-VERSION_FULL=0.9.1 (20)
-BUILD=20
+VERSION_FULL=0.9.1 (21)
+BUILD=21

src/helpers/bytes.ts

@@ -10,8 +10,9 @@
  */
 
 export function bytesToHex(bytes: ArrayLike<number>) {
-  const arr: string[] = new Array(bytes.length);
-  for(let i = 0; i < bytes.length; ++i) {
+  const length = bytes.length;
+  const arr: string[] = new Array(length);
+  for(let i = 0; i < length; ++i) {
     arr[i] = (bytes[i] < 16 ? '0' : '') + (bytes[i] || 0).toString(16);
   }
   return arr.join('');

src/lib/crypto/srp.ts

@@ -44,11 +44,9 @@ export async function computeSRP(password: string, state: AccountPassword, isNew
   //console.log('computeSRP:', password, state, isNew, algo);
 
   const p = str2bigInt(bytesToHex(algo.p), 16);
-  const B = str2bigInt(bytesToHex(state.srp_B), 16);
   const g = int2bigInt(algo.g, 32, 256);
   
   //log('p', bigInt2str(p, 16));
-  //log('B', bigInt2str(B, 16));
   
   /* if(B.compareTo(BigInteger.ZERO) < 0) {
     console.error('srp_B < 0')
@@ -83,14 +81,6 @@ export async function computeSRP(password: string, state: AccountPassword, isNew
     return addPadding(arr, len, true, true, true);
   };
   
-  const pForHash = padArray(bytesFromHex(bigInt2str(p, 16)), 256);
-  const gForHash = padArray(bytesFromHex(bigInt2str(g, 16)), 256); // like uint8array
-  const b_for_hash = padArray(bytesFromHex(bigInt2str(B, 16)), 256);
-
-  /* log(bytesToHex(pForHash));
-  log(bytesToHex(gForHash));
-  log(bytesToHex(b_for_hash)); */
-
   const v = powMod(g, x, p);
   
   const flipper = (arr: Uint8Array | number[]) => {
@@ -111,6 +101,16 @@ export async function computeSRP(password: string, state: AccountPassword, isNew
     return padArray(/* (isBigEndian ? bytes.reverse() : bytes) */bytes, 256);
   }
   
+  const B = str2bigInt(bytesToHex(state.srp_B), 16);
+  //log('B', bigInt2str(B, 16));
+  
+  const pForHash = padArray(bytesFromHex(bigInt2str(p, 16)), 256);
+  const gForHash = padArray(bytesFromHex(bigInt2str(g, 16)), 256); // like uint8array
+  const b_for_hash = padArray(bytesFromHex(bigInt2str(B, 16)), 256);
+  /* log(bytesToHex(pForHash));
+  log(bytesToHex(gForHash));
+  log(bytesToHex(b_for_hash)); */
+
   //log('g_x', bigInt2str(g_x, 16));
 
   const kHash = await CryptoWorker.invokeCrypto('sha256-hash', bufferConcats(pForHash, gForHash));