Support for g!=2 in DH

mtproto-client.c

@@ -441,7 +441,7 @@ int process_dh_answer (struct connection *c, char *packet, int len) {
   assert (decrypt_buffer[5] == (int)CODE_server_DH_inner_data);
   assert (!memcmp (decrypt_buffer + 6, nonce, 16));
   assert (!memcmp (decrypt_buffer + 10, server_nonce, 16));
-  assert (decrypt_buffer[14] == 2);
+  int g = decrypt_buffer[14];
   in_ptr = decrypt_buffer + 15;
   in_end = decrypt_buffer + (l >> 2);
   BN_init (&dh_prime);
@@ -469,7 +469,7 @@ int process_dh_answer (struct connection *c, char *packet, int len) {
   out_long (0LL);
   
   BN_init (&dh_g);
-  BN_set_word (&dh_g, 2);
+  BN_set_word (&dh_g, g);
 
   assert (RAND_pseudo_bytes ((unsigned char *)s_power, 256) >= 0);
   BIGNUM *dh_power = BN_new ();

queries.c

@@ -302,8 +302,8 @@ extern struct dc *DC_list[];
 extern struct dc *DC_working;
 
 void out_random (int n) {
-  assert (n <= 16);
-  static char buf[16];
+  assert (n <= 32);
+  static char buf[32];
   int i;
   for (i = 0; i < n; i++) {
     buf[i] = lrand48 () & 255;
@@ -1375,7 +1375,7 @@ void send_part (struct send_file *f) {
       encr_start ();
       out_int (CODE_decrypted_message);
       out_long (r);
-      out_random (16);
+      out_random (15 + 4 * (lrand48 () % 3));
       out_string ("");
       if (f->media_type == CODE_input_media_uploaded_photo) {
         out_int (CODE_decrypted_message_media_photo);