Hollywood forums

Posted: **Tue Apr 27, 2021 10:18 am**

Hello Andreas,
I took me 2 days to identify why my encryption routines worked on Windows but not on Linux (Linux Mint 9, x64).
Finally I've found a small script that demonstrate the bug:

Code: Select all

Local a = 72
Local b = 111
Local c = Ror(a, b, #BYTE)
DebugPrint(a .. " ror " .. b .. " = " .. c)
DebugPrompt("?")

Run on Windows and you get:

Code: Select all

72 ror 111 = 144
?

Compile and run on Linux and you get:

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72 ror 111 = 0
?

btw setting 'b' with a smaller value (for example 5) it works the same way on both Windows & Linux

Posted: **Sat May 01, 2021 10:08 pm**

Thanks for the report, fixed now!

Code: Select all

- Fix: Ror() and Rol() didn't return correct results when the rotation count was greater than the rotation bit length

As a workaround, just make sure the rotation cycle count is not bigger than rotation bit length by applying a modulo division first, e.g.

Code: Select all

Local a = 72
Local b = 111
Local c = Ror(a, b%8, #BYTE)
DebugPrint(a .. " ror " .. b .. " = " .. c)
DebugPrompt("?")

Posted: **Sun May 02, 2021 8:27 am**

Thank you!

Hollywood forums

Ror() & Rol() bugged on Linux

Ror() & Rol() bugged on Linux

Re: Ror() & Rol() bugged on Linux

Re: Ror() & Rol() bugged on Linux