The trick is... you need (as for today) install "Pre" version of CocoaPods tools, because only this version have support for Swift frameworks. I know it's kinda confusing that you can install swift Pods with the older toolset, and then turn out it doesn't work, though, not my fault.
Here is short guide. First, install version Pre of CocoaPods, like this:
$ gem install cocoapods --pre
my version is 0.36.0.beta.2
$ pod --version 0.36.0.beta.2
add pod to project Podfile
and install framework
$ pod install Analyzing dependencies Downloading dependencies Using CryptoSwift (0.0.6) Generating Pods project Integrating client project
I've made a short screencast describing process of installation, and example of AES encryption.