digest: improve implementations of the SerializableState trait
#1953
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newpavlov
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SerializableState trait
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Previously we were using block size + 1 byte to serialize eager block buffers while block size is sufficient. It resulted in odd serialization state sizes. The
SerializableStateimpl also a bit convoluted.The new implementation results in more efficient serialization and more straightforward code. The main drawback is that it inevitably involves a breaking change in the serialization format.
Depends on RustCrypto/utils#1200.