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Merge pull request #634 from paulhauner/patch-10

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Add explicit assert to get_permutated_index
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Danny Ryan 2019-02-18 10:14:07 -07:00 committed by GitHub
commit 75e649cc15
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specs/core/0_beacon-chain.md
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@ -747,6 +747,7 @@ 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**40
for round in range(SHUFFLE_ROUND_COUNT):
pivot = bytes_to_int(hash(seed + int_to_bytes1(round))[0:8]) % list_size