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Fix #1090

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Avoid signed integer
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Justin 2019-05-17 05:59:01 -04:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -887,7 +887,7 @@ def get_shuffled_index(index: ValidatorIndex, index_count: int, seed: Bytes32) -
# See the 'generalized domain' algorithm on page 3
for round in range(SHUFFLE_ROUND_COUNT):
pivot = bytes_to_int(hash(seed + int_to_bytes(round, length=1))[0:8]) % index_count
flip = (pivot - index) % index_count
flip = (pivot + index_count - index) % index_count
position = max(index, flip)
source = hash(seed + int_to_bytes(round, length=1) + int_to_bytes(position // 256, length=4))
byte = source[(position % 256) // 8]