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63e621c27d
* rename compute_epoch_of_slot(...) to compute_epoch_at_slot(...) * remove some unnecessary imports; remove some crosslink-related code and tests; complete renaming of compute_epoch_of_slot(...) to compute_epoch_at_slot(...) * rm more transfer-related code and tests; rm more unnecessary strutils imports * rm remaining unused imports * remove useless get_empty_per_epoch_cache(...)/compute_start_slot_of_epoch(...) calls * rename compute_start_slot_of_epoch(...) to compute_start_slot_at_epoch(...) * rename ACTIVATION_EXIT_DELAY to MAX_SEED_LOOKAHEAD * update domain types to 0.9.0 * mark AttesterSlashing, IndexedAttestation, AttestationDataAndCustodyBit, DepositData, BeaconBlockHeader, Fork, integer_squareroot(...), and process_voluntary_exit(...) as 0.9.0 * mark increase_balance(...), decrease_balance(...), get_block_root(...), CheckPoint, Deposit, PendingAttestation, HistoricalBatch, is_active_validator(...), and is_slashable_attestation_data(...) as 0.9.0 * mark compute_activation_exit_epoch(...), bls_verify(...), Validator, get_active_validator_indices(...), get_current_epoch(...), get_total_active_balance(...), and get_previous_epoch(...) as 0.9.0 * mark get_block_root_at_slot(...), ProposerSlashing, get_domain(...), VoluntaryExit, mainnet preset Gwei values, minimal preset max operations, process_block_header(...), and is_slashable_validator(...) as 0.9.0 * mark makeWithdrawalCredentials(...), get_validator_churn_limit(...), get_total_balance(...), is_valid_indexed_attestation(...), bls_aggregate_pubkeys(...), initial genesis value/constants, Attestation, get_randao_mix(...), mainnet preset max operations per block constants, minimal preset Gwei values and time parameters, process_eth1_data(...), get_shuffled_seq(...), compute_committee(...), and process_slots(...) as 0.9.0; partially update get_indexed_attestation(...) to 0.9.0 by removing crosslink refs and associated tests * mark initiate_validator_exit(...), process_registry_updates(...), BeaconBlock, Eth1Data, compute_domain(...), process_randao(...), process_attester_slashing(...), get_base_reward(...), and process_slot(...) as 0.9.0
73 lines
2.4 KiB
Nim
73 lines
2.4 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2019 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at http://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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# Serenity hash function / digest
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#
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# https://github.com/ethereum/eth2.0-specs/blob/v0.9.0/specs/core/0_beacon-chain.md#hash
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#
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# In Phase 0 the beacon chain is deployed with SHA256 (SHA2-256).
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# Note that is is different from Keccak256 (often mistakenly called SHA3-256)
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# and SHA3-256.
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#
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# In Eth1.0, the default hash function is Keccak256 and SHA256 is available as a precompiled contract.
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#
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# In our code base, to enable a smooth transition
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# (already did Blake2b --> Keccak256 --> SHA2-256),
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# we call this function `eth2hash`, and it outputs a `Eth2Digest`. Easy to sed :)
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import
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chronicles,
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nimcrypto/[sha2, hash, utils], eth/common/eth_types_json_serialization,
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hashes
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export
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eth_types_json_serialization, hash.`$`
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type
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Eth2Digest* = MDigest[32 * 8] ## `hash32` from spec
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Eth2Hash* = sha256 ## Context for hash function
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chronicles.formatIt Eth2Digest:
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mixin toHex
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it.data.toHex(true)
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func shortLog*(x: Eth2Digest): string =
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x.data.toHex(true)[0..7]
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# TODO: expose an in-place digest function
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# when hashing in loop or into a buffer
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# See: https://github.com/cheatfate/nimcrypto/blob/b90ba3abd/nimcrypto/sha2.nim#L570
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func eth2hash*(v: openArray[byte]): Eth2Digest {.inline.} =
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# We use the init-update-finish interface to avoid
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# the expensive burning/clearing memory (20~30% perf)
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# TODO: security implication?
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var ctx: sha256
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ctx.init()
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ctx.update(v)
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ctx.finish()
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proc update*(ctx: var Sha2Context; digest: Eth2Digest) =
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ctx.update digest.data
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template withEth2Hash*(body: untyped): Eth2Digest =
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## This little helper will init the hash function and return the sliced
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## hash:
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## let hashOfData = withHash: h.update(data)
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var h {.inject.}: sha256
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init(h)
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body
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var res = finish(h)
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res
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func hash*(x: Eth2Digest): Hash =
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## Hash for digests for Nim hash tables
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# Stub for BeaconChainDB
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# We just slice the first 4 or 8 bytes of the block hash
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# depending of if we are on a 32 or 64-bit platform
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result = cast[ptr Hash](unsafeAddr x)[]
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