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Add cautionary assert in shuffling function (#622)

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Paul Hauner 2019-02-15 01:14:59 +11:00 committed by Justin
parent 6c49270664
commit d7fb7729e6
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specs/core/0_beacon-chain.md
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@ -744,6 +744,8 @@ def get_permuted_index(index: int, list_size: int, seed: Bytes32) -> int:
https://link.springer.com/content/pdf/10.1007%2F978-3-642-32009-5_1.pdf https://link.springer.com/content/pdf/10.1007%2F978-3-642-32009-5_1.pdf
See the 'generalized domain' algorithm on page 3. See the 'generalized domain' algorithm on page 3.
""" """
assert index < list_size
for round in range(SHUFFLE_ROUND_COUNT): for round in range(SHUFFLE_ROUND_COUNT):
pivot = bytes_to_int(hash(seed + int_to_bytes1(round))[0:8]) % list_size pivot = bytes_to_int(hash(seed + int_to_bytes1(round))[0:8]) % list_size
flip = (pivot - index) % list_size flip = (pivot - index) % list_size