44 lines
1.7 KiB
Nim
44 lines
1.7 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2024 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 https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://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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{.push raises: [].}
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# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.6/tests/core/pyspec/eth2spec/utils/merkle_minimal.py
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# Merkle tree helpers
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# ---------------------------------------------------------------
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import
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std/sequtils,
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stew/endians2,
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# Specs
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../spec/[eth2_merkleization, digest],
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../spec/datatypes/base
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template getProof*(
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proofs: seq[Eth2Digest], idxParam: int): openArray[Eth2Digest] =
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let
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idx = idxParam
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## TODO: It's surprising that we have to do +1 here.
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## It seems that `depositContractLimit` is set too high.
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startIdx = idx * (DEPOSIT_CONTRACT_TREE_DEPTH + 1)
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endIdx = startIdx + DEPOSIT_CONTRACT_TREE_DEPTH - 1
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proofs.toOpenArray(startIdx, endIdx)
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func attachMerkleProofs*(deposits: var openArray[Deposit]): Eth2Digest =
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let depositsRoots = mapIt(deposits, hash_tree_root(it.data))
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var merkleizer = createMerkleizer2(DEPOSIT_CONTRACT_TREE_DEPTH + 1)
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let proofs = merkleizer.addChunksAndGenMerkleProofs(depositsRoots)
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for i in 0 ..< depositsRoots.len:
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deposits[i].proof[0 ..< DEPOSIT_CONTRACT_TREE_DEPTH] = getProof(proofs, i)
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deposits[i].proof[DEPOSIT_CONTRACT_TREE_DEPTH] = default(Eth2Digest)
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deposits[i].proof[DEPOSIT_CONTRACT_TREE_DEPTH].data[0..7] =
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toBytesLE deposits.lenu64
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mixInLength(merkleizer.getFinalHash(), deposits.len)
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