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eth2.0-specs
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Mix PR feedback from Danny and Proto

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Hsiao-Wei Wang 2020-06-29 12:50:01 +08:00
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specs/phase0/beacon-chain.md
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@ -726,13 +726,13 @@ def compute_shuffled_index(index: uint64, index_count: uint64, seed: Bytes32) ->
# Swap or not (https://link.springer.com/content/pdf/10.1007%2F978-3-642-32009-5_1.pdf) # Swap or not (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
for current_round in map(uint8, range(SHUFFLE_ROUND_COUNT)): for current_round in range(SHUFFLE_ROUND_COUNT):
pivot = bytes_to_uint64(hash(seed + uint_to_bytes(current_round))[0:8]) % index_count pivot = bytes_to_uint64(hash(seed + uint_to_bytes(uint8(current_round)))[0:8]) % index_count
flip = uint64((pivot + index_count - index) % index_count) flip = (pivot + index_count - index) % index_count
position = max(index, flip) position = max(index, flip)
source = hash( source = hash(
seed seed
+ uint_to_bytes(current_round) + uint_to_bytes(uint8(current_round))
+ uint_to_bytes(uint32(position // 256)) + uint_to_bytes(uint32(position // 256))
) )
byte = source[(position % 256) // 8] byte = source[(position % 256) // 8]