Call Encryption

#define LUAVM_DAX_ME 0x1C6B438
#define LUAVM_DAX_AO 0x1A7D575
#define LUAVM_DAX_MO 0x1451AFB

static uint32_t rbxDaxEncodeOp(uint32_t x, uint32_t mulEven, uint32_t addEven, uint32_t mulOdd, uint32_t addOdd)
{
   uint32_t result      = 0;
   uint32_t mask        = 1;
   for (size_t i = 0; i < 8*sizeof(uint32_t); ++i)
   {
       uint32_t bitDesired = mask & x;
       uint32_t bitOdd     = mask & (result*mulOdd + addOdd);
       uint32_t bitEven    = mask & (result*mulEven + addEven);
       if ((bitEven ^ bitOdd) != bitDesired)
       {
           result |= mask;
       }
       mask <<= 1;
   }
   return result;
}

unsigned int DaxTranslateCode(unsigned int i, int pc, unsigned int key){
   Instruction enc = i;
   BYTE op = GET_OPCODE(i);
   switch(op){
      case OP_CALL:
      case OP_TAILCALL:
      case OP_RETURN:
      case OP_CLOSURE:
         enc = rbxDaxEncodeOp(i, LUAVM_DAX_ME, pc, LUAVM_DAX_MO, LUAVM_DAX_AO);
         SET_OPCODE(enc, GET_OPCODE(i));
         break;
      case OP_MOVE:
         SETARG_C(enc, (PC | 1));
      default:
         break;
   }
   return LUAVM_ENCODEINSN(enc, key);
}