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fix keccak256 digest comments

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Dustin Brody 2019-03-09 12:34:08 -08:00
parent aec31b1126
commit 89aa3ec53f
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1 changed files with 9 additions and 9 deletions
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18
beacon_chain/spec/digest.nim
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@ -1,5 +1,5 @@
# beacon_chain
# Copyright (c) 2018 Status Research & Development GmbH
# Copyright (c) 2018-2019 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at http://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
@ -7,15 +7,15 @@
# Serenity hash function / digest
#
# From spec:
# https://github.com/ethereum/eth2.0-specs/blob/0.4.0/specs/core/0_beacon-chain.md#hash
#
# We aim to have a STARK-friendly hash function `hash(x)` for the production
# launch of the beacon chain. While the standardisation process for a
# STARK-friendly hash function takes place—led by STARKware, who will produce a
# detailed report with recommendations—we use `BLAKE2b-512` as a placeholder.
# Specifically, we set `hash(x) := BLAKE2b-512(x)[0:32]` where the `BLAKE2b-512`
# algorithm is defined in [RFC 7693](https://tools.ietf.org/html/rfc7693) and
# the input `x` is of type `bytes`.
# In Phase 0 the beacon chain is deployed with the same hash function as
# Ethereum 1.0, i.e. Keccak-256 (also incorrectly known as SHA3).
#
# Note: We aim to migrate to a S[T/N]ARK-friendly hash function in a future
# Ethereum 2.0 deployment phase.
#
# https://crypto.stackexchange.com/questions/15727/what-are-the-key-differences-between-the-draft-sha-3-standard-and-the-keccak-sub
#
# In our code base, to enable a smooth transition, we call this function
# `eth2hash`, and it outputs a `Eth2Digest`. Easy to sed :)