You might be interested in googling Suite B. It lays out guidelines for encrypting government data up to the Top Secret level. If you dig a little bit, you can

You might be interested in googling Suite B. It lays out guidelines for encrypting government data up to the Top Secret level. If you dig a little bit, you can find guidelines for auditing crypto implementations and also for handling/generating key material. Briefly, Suite B is AES-GCM, ECDH, ECDSA, and SHA2. Edit: autocorrect