xeoncross - Page 3 - Developer IT

How do you print raw UTF-8 characters from their numbers? [PHP]

- by Xeoncross

Say I wanted to print a ÿ (latin small y with diaeresis) from it's Unicode/UTF-8 number of "U+00FF" or hex of "c3 bf". How can I do that in PHP? Note: In order for it show correctly in a browser I know that the first step is header('Content-Type: text/html; charset=utf-8');

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How to encrypt data in php using Public/Private keys?

- by Xeoncross

I have a small string of some data (less than 1kb) that I would like to have user agents pass to other sites when they are sent from my site. In order for the other sites to verify that I was the one that created the string I though of two options. The server pings me back to confirm (like paypal, openid, etc..) I use public/private keys to prove I sent the message (like PGP, DKIM, etc..) I don't want to setup HMAC because that would mean I have to use custom keys for each site which would be a pain. Out of those two choices it seems that #2 would save on bandwidth which makes it seem like a better choice. So how can you setup public/private key cryptography using PHP and are there any downsides?

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The 100% width HTML element problem

- by Xeoncross

When assigning some HTML elements (like a form input) 100% width - you can no longer apply any additional styles that might effect the width. Things like border or padding will cause the element to exceed 100%. This results in awkward elements that may be outside of their parent elements. Since CSS doesn't support width: 100% - 2px; The only way I know around this is to use an absolute pixel width (width: 98px) or chop the element off at 100% which is not really an option. <div style="overflow:hidden;"> <input style="width:100%; border: 1px solid #000;" /> </div> Are they're any other ways around this?

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How long can a hash left out in the open be considered safe?

- by Xeoncross

If I were to leave a SHA2 family hash out on my website - how long would it be considered safe? How long would I have before I could be sure that someone would find a collision for it and know what was hashed? I know that the amount of time would be based on the computational power of the one seeking to break it. It would also depend on the string length, but I'm curious just how secure hashes are. Since many of us run web-servers we constantly have to be prepared for the day when someone might make it all the way to the database which stores the user hashes. So, move the server security out of the way and then what do you have? This is a slightly theoretical area for many of the people I have talked with, so I would love to actually have some more information about average expectations for cracking.

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What does the PHP configuration option "--prefix=PREFIX" do?

- by Xeoncross

I have heard that setting the --prefix=PREFIX option when compiling PHP on linux will allow you to have more than one install of PHP at a time without them clashing. (I think the default if this isn't set is /usr/local). However, I'm not sure what exactly it does or what a good setting to use is. Furthermore, I've also heard that setting it to something other than the default value might make some PHP extensions harder to install. ./configure --prefix=PREFIX ...

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PHP: is urlencode() a safe way to allow valid UTF-8 strings in the URL?

- by Xeoncross

I have user submitted tags that can be any type of (valid) UTF-8 string. I want to know if it is safe to include them in the URL merly by running them through urlencode(). In other words, is urlencode() safe to use for valid UTF-8 strings? (by valid I mean id have already force-encoded them to UTF-8)

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[NGINX] How do you hide .git project directories?

- by Xeoncross

Now that I have nginx setup I need to be able to hide my .git directories. What kind of rewrite would I need to stop prying eyes? And where in the server {} or http {} block would it go?

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