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Add explicit assert to get_permutated_index

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There is an implicit assert in `int_to_bytes4`, however I think it's rather hidden.
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Paul Hauner 2019-02-15 11:57:23 +11:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -745,6 +745,7 @@ def get_permuted_index(index: int, list_size: int, seed: Bytes32) -> int:
See the 'generalized domain' algorithm on page 3.
"""
assert index < list_size
assert list_size < 2**24
for round in range(SHUFFLE_ROUND_COUNT):
pivot = bytes_to_int(hash(seed + int_to_bytes1(round))[0:8]) % list_size