I would look at libsodium (or a wrapper on top) rather than Keyczar at this stage, considering your requirements.
Looking at the bindings list, there are a couple of libraries for Android, Swift, Objective C, and Java (I prefer Kalium but YMMV).
The “encrypt / decrypt / hash” bit is authenticated encryption, which you can do with:
The wrappers will have slightly different ways to call this, for instance, Kalium has SecretBox class:
but it’s well maintained and has an extremely wide user base.
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