From Gotthardt Designs:
Need to connect to a wireless network that is WEP encoded but all you have is the passphrase and your network connection client doesn't handle passphrases? You need to have an offline WEP key generator that will give you the 26 HEX digits you need. You need WEPGen! WEPGen uses the defacto standard for generating WEP keys used by most wireless routers. It supports Netgear, Linksys, etc. and is compatible with alternate firmware like 'Tomato'. Enter the passphrase into WEPGen to generate the WEP keys for bit sizes 64 and 128. Tap on the key you need and then enter it using the Settings/Wi-Fi built-in app. This works for iPhone and iPod touch. It can also be used for Windows clients. I use it all the time when people visit and want to join my network at home. NOTE: With the new 3.0 release, you can now copy and paste the key from the display box to the wireless settings password! This program is NOT for use as a hacking tool! It is intended to be a utility to help connect to a network when the passphrase is already known, but the wireless setup wizard/app/program will only accept hex digits (like Win XP, etc)
What's new in this version:
Added second key generator for 64 bit keys. Show all 4 128 bit keys to support other routers. One-touch copy to pasteboard! No need to select-all, copy, etc. Added cursor to show which key was put on pasteboard. Easier to read - larger and higher contrast.