Keep a number as a byte?

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Keep a number as a byte?

 
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  #1
May 9th, 2009
Hello.
I'm developing a encryption program. I'm testing with encryption right now.
I use bitwise operators and also bitwise shifts. [OR [|], XOR[^], AND[&], NOT[~], right[>>],left[<<]]

To add even more security, I went ahead and added bitwise shifts.
Whenever I shift the numbers, they go over 256 [max int in a byte].
Is there any way I can declare the integer so that it doesn't go above 256, and if it does it just overlaps?

I'm sorry I can't explain it well, I know C very little..
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Re: Keep a number as a byte?

 
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  #2
May 9th, 2009
No. You'll have to write a cyclic shift macros or function. ie, something like
[code]#define cyclicShiftRight(val,shiftBy) ...code here...
C Syntax (Toggle Plain Text) 
  1. #define cyclicShiftLeft(val,shiftBy) ...code here...
  2. //...
  3. char num = 0x80; //1000-0000
  4. cyclicShiftRight/Left(num,3); //0000-0100
Last edited by twomers; May 9th, 2009 at 5:35 pm.
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Re: Keep a number as a byte?

 
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  #3
May 10th, 2009
That's going to be a pain in the rear end -.-..
Thanks.
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Re: Keep a number as a byte?

 
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  #4
May 10th, 2009
You can store it in a char (8 bit) variable.
Even if "char" gives impression of "character" variable actually it's just a integer of 8 bits.

This should solve you problem if I got it correctly. Otherwise please clarify your problem.
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