Perl XOR

fixu2 has asked for the wisdom of the Perl Monks concerning the following question:

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Re: Perl XOR by Happy-the-monk (Canon) on Sep 18, 2013 at 18:18 UTC
"For a given string, perform XOR by 32 bits, and take the inverse of the XOR result as a hexadecimal value" Where have you been looking? Bitwise Or and Exclusive Or printf sprintf Cheers, Sören Créateur des bugs mobiles - let loose once, run everywhere. (hooked on the Perl Programming language)	[reply]
Re: Perl XOR by kennethk (Abbot) on Sep 18, 2013 at 18:18 UTC
What did you try? What worked? What didn't? This is not a code writing service, but we're happy to give pointers and help debug. See How do I post a question effectively?. You should find some useful guidance with Bitwise Or and Exclusive Or in perlop, sprintf's `%x`, and hex (or possibly unpack depending on what your input string looks like). #11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.	[reply] [d/l]
Re: Perl XOR by ikegami (Patriarch) on Sep 18, 2013 at 18:40 UTC
What does it mean to "XOR a string by 32 bits"? Does that mean "XOR a 4-byte string with a 32-bit value"? If so, `unpack('N', $s) ^ $val # Big-endian byte order -or- unpack('V', $s) ^ $val # Little-endian byte order` [download] What does it mean to "take the inverse of the XOR result as a hexadecimal value"? Hexadecimal is a string representation of a number, and strings don't have inverses.	[reply] [d/l]
Re: Perl XOR by Laurent_R (Canon) on Sep 18, 2013 at 18:46 UTC
Some of the operators you may want to consider: `\|` (bitwise or), `^` (bitwise xor), `~` (bitwise not). They should give you what you need if I understood your requirement correctly. Try `perldoc op` for more information on them.	[reply] [d/l] [select]
Re: Perl XOR by derby (Abbot) on Sep 19, 2013 at 01:20 UTC
lmgfty. -derby	[reply]


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