File encrypt/decypt

I am planning to do a bit of encryption work soon and I decided to review the very first non-trivial Go program I wrote… it was good for a chuckle or two. I decided to spend a few minutes to update it and to move AES-256.

The code will encrypt and write a gzip file; and decrypt it back to the original. The gzip keeps the file size down, at least for text files. Encrypted PDFs will be a little smaller than than the original, but not a lot.

If nothing else, it is an easy intro to the encryption capabilities in the standard library.
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