For Swift 1.2 check swift12 branch.
To install CryptoSwift, add it as a submodule to your project (on the top level project directory):
git submodule add https://github.com/krzyzanowskim/CryptoSwift.git
Then, drag the CryptoSwift.xcodeproj file into your Xcode project, and add CryptoSwift.framework as a dependency for your target.
By default project is setup for iOS. You need to switch to OS X SDK manually see #8