~dricottone/my-utils

ref: a5400e398c7c8f77d09b3e5966789d38f48a47a6 my-utils/crypto d---------
Starting point for cryptographic utilities

Much of this came from my deep dive into digital signatures for my chat
application. More details in a recent blog post.

These tools are not yet mature enough to warrant an installation recipe.
The sign, verify, and verify-filter utilities are especially so.