iOS and Windows Phone compatible encryption - ios

I'm a real noob to encryption. After breaking my head over this for a couple of days i've decided to search for help on StackOverflow.
Currently I'm developing mobile applications for iOS, Android and Windows Phone. In the application i need to request data from a server with an encrypted url. Because the application has to be for iOS, Android and Windows Phone i need to use an encryption that works on each platform. I've decided to use AES encryption with a key and an iv.
I've gotten the AES encryption to work for Windows Phone, but am really stuck on iOS. I've searched the web for a good example but haven't found anything that explained the whole proces. Could anyone help me by giving me an example (with explanation) or a good URL?
Would really appreciate the help!
Edit:
I know I want to generate an AES key based on a key and an iv. With the aes key i want to encrypt my password. The exact question is how i would do that in code.

I have used openssl for encryption between devices and platforms. There is quite of bit of documentation available and I'm pretty sure it will work for what you need.
There are also several wrappers available on github too to make encrypt/decrypting a bit easier.
OpenSSL

I've ended up using AES. This Encryption type is available for Android, iOS and Windows Phone.
For iOS and Android there are plugins available on internet to make the work easier for you. Just search for {platformname} AES and you should get enough websites.

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