what does "^" do?

[riches85]

I have never even taken a serious look at php until today. I have been asked to take an encryption algorythm written in php and convert it to java. I have been able to understand most of it, but one assignment has confused me and I cant find any documentation explaining it. I am sure it is very simple. Here is the line

$k_ipad = $key ^ str_repeat(chr(0x36), 64);

I am having trouble looking up what the "^" does. It would look like a concatenation assignment if I didnt already know it was a "." not a "^". Any help would be greatly appreciated. Thanks

 

[sleipnir214]

http://php.he.net/manual/en/language.operators.bitwise.php

Want the best answers? Ask the best questions:

http://www.catb.org/~esr/faqs/smart-questions.html

TANSTAAFL!!

 

[vbkris]

hi, i went through it ans still couldnt get it...

Known is handfull, Unknown is worldfull

 

[sleipnir214]

vbkris:
It's bitwise XOR.

Want the best answers? Ask the best questions:

http://www.catb.org/~esr/faqs/smart-questions.html

TANSTAAFL!!

 

[clarkin]

XOR, the staple of any crypto system ;-)

Posting code? Wrap it with code tags: [ignore]

[/ignore][code]CodeHere

[ignore][/code][/ignore].