cipher: add traits for tweakable block ciphers #1721
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The trait design generally follows the
BlockCipherEnc/Dectraits. We currently do not have tweakable block cipher implementations which use the backend capability, but I think it's still worth to include it for API consistency and to future-proof the traits. Some of the helper methods (e.g.encrypt_blocks) are not translated since it's unclear how to organize passing of tweaks. Arguably, such methods should not be used with tweakable block ciphers either way.As a bridge between tweakable and non-tweakable traits the
ZeroTweakwrapper is introduced. It allows users to use tweakable block cipher implementations with the parts of the ecosystem which expects non-tweakble block ciphers while still being explicit in the code (e.g.ZeroTweak<Threefish256>).Closes #177