digest: add block-level API #380
Merged
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This PR exposes block-level API and adds a wrapper type which implements the higher-level traits. It allows to remove some of boilerplate from the implementation crates, plus we no longer need the macro for implementing
io::Read
. Also it will allow a more efficient HMAC implementation.Additionally PR removes the variable length API in favor of making type generic over output length as suggested in #262.