What does this miracle function (ARM/Thumb) (SAMP ANDROID) do?

Question

reverse engineering

During the reverse of the SAMP client on android, I stumbled upon this miracle:

some kind of game

https://pastebin.com/5Ue6wYM0
ну или (бесполезный) псевдокод:

void __fastcall encrypt(int *a1, char *a2, unsigned int a3, int a4)
{
  int v4; // [sp+38h] [bp+8h]

  if ( !(a3 >> 2) )
    JUMPOUT(0x88922);
  sub_88868(a3 >> 2, (int)a2, a3, a4, v4);
}

a bit of listing after this function to a obviously different function (forcibly turned it into code, before that there was the usual undefined):

not much game yet

https://pastebin.com/bxE55ViG

arrays (more precisely, references to them) of 4 ints and 8 chars, respectively, are passed in 1 and 2 arguments. 3 and 4 argument - 8 and 32.

calling a miracle

.text:00094A6C                 ADD.W           R0, R6, #0x398 ; a1 - int[4]
.text:00094A70                 ADD.W           R1, R6, #0x3B8 ; a2 - char[8]
.text:00094A74                 MOVS            R2, #8  ; a3
.text:00094A76                 MOVS            R3, #0x20 ; ' ' ; a4
.text:00094A78

если что, в R6 находится SP

I tried to change the bounds, but there are a lot of undefined variables and nothing useful, respectively ...
I hope someone more experienced than me can understand what this function does with the second argument.
and yes, according to my tests, it produces a different result every time with the same values.