If len(b) > AddressLength, b will be cropped from the left.

Converts bytes to sha256 hash TODO : convert to sha3.

checks if a string is of the format 0xSomething.

converts the hexadecimal string to bytes removes the 0x from the hex string if prefix is present if odd number of characters, prefix hex string with 0.

Accepts a hex encoded address string eg.

TODO : validate the logic in go-eth.