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The upstream libray has removed the assembly-based implementation of keccak. We need to maintain our own library to avoid a peformance regression. --------- Co-authored-by: lightclient <lightclient@protonmail.com>
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This is a vendored and modified copy of golang.org/x/crypto/sha3, with an assembly implementation of keccak256. We wish to retain the assembly implementation, which was removed in v0.44.0.
Ethereum uses a 'legacy' variant of Keccak, which was defined before it became SHA3. As such, we cannot use the standard library crypto/sha3 package.