Converting NSData to base64

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EDIT

As of OS X 10.9 / iOS 7, this is built into the frameworks.

See -[NSData base64EncodedDataWithOptions:]

Prior to iOS7/OS X 10.9:

Matt Gallagher wrote an article on this very topic. At the bottom he gives a link to his embeddable code for iPhone.

On the mac you can use the OpenSSL library, on the iPhone he writes his own impl.

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