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The ECDSA algorithm can't be used for encryption. It's not that there's no accepted way to do it, it's that it's simply not possible to do so. Likewise, RSA signing can't be used to encrypt (there's a mandatory hash in signing that you don't want in encryption). However, RSA signatures work similarly to RSA encryption; they aren't interchangeable, but ...


2

Deterministic signatures are safe in the random oracle model. Using HMAC_DRBG allowed me to rely on existing research on the safety of that construction and how close it comes to a "true" random oracle. If I had used any other "handmade" construction, then I would have had to provide extensive analysis on why it is secure. Being naturally lazy, I chose ...



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