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A fix for #172 , implementation of verify-only PSS padding schema

Instead of introducing a DummyRng, it seems to me like it would make more sense to remove salt_rng from PaddingScheme::PSS.

Its only use is to pass it to pss::sign, and in that regard it can be passed as an explicit parameter rather than embedding it into the padding scheme. An RNG is already an explicit parameter to sign_blinded (in which case it receives two RNGs. I'm not sure why one would want to use two RNGs?)

Really it'd be nice to implement the traits from the signature crate, where the "sign" vs "sign with RNG" cases are concretely handled as Signer versus RandomizedSigner, but that's a lot more work.

@tarcieri done

gracious ping

Refreshed to remove conflict.

@tarcieri could this be included in the upcoming 0.7.0 release? It would save me a dependency and make it clearer what is going on in my code.

Yep, that's the plan

Yep, that's the plan

Great! I look forward to testing 0.7.0-pre2😁