3

For example, this Python file implements SHA3 in a compact and very readable form in Python. I wonder if we have those compact implementations for the primitives used on Ethereum, in special Keccak (not SHA3) and ECDSA (signing and recover).

1

For Keccak the delimitedSuffix should be 0x01 instead of 0x06 in SHA3.

So it should look like

def Keccak_256(inputBytes):
    return Keccak(1088, 512, inputBytes, 0x01, 256//8)

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