Exposing blake2 compression function

[kevaundray]

Hi,

Would it be in scope to expose the compression function for blake2?

The usecase I have in mind is to replace this particular function: https://github.com/bluealloy/revm/blob/b8396776a9d53e1553c0396c96a14b461cda17ce/crates/precompile/src/blake2.rs#L55

[tarcieri]

We expose the compression functions in the sha2 crate so IMO this is conceptually fine

[kevaundray]

Re using blake2 in general -- Is this issue still relevant: #407 ?

[tarcieri]

@kevaundray we've long planned to completely replace the implementation: #228.

Unfortunately that PR has long gone by the wayside.