54 lines
1.5 KiB
Nim
54 lines
1.5 KiB
Nim
## Nim-Codex
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## Copyright (c) 2023 Status Research & Development GmbH
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## Licensed under either of
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## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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import pkg/poseidon2
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import pkg/poseidon2/io
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import pkg/questionable/results
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import pkg/libp2p/multihash
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import ../merkletree
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func digestTree*(
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_: type Poseidon2Tree,
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bytes: openArray[byte], chunkSize: int): ?!Poseidon2Tree =
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## Hashes chunks of data with a sponge of rate 2, and combines the
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## resulting chunk hashes in a merkle root.
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##
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var index = 0
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var leaves: seq[Poseidon2Hash]
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while index < bytes.len:
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let start = index
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let finish = min(index + chunkSize, bytes.len)
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let digest = Sponge.digest(bytes.toOpenArray(start, finish - 1), rate = 2)
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leaves.add(digest)
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index += chunkSize
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return Poseidon2Tree.init(leaves)
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func digest*(
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_: type Poseidon2Tree,
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bytes: openArray[byte], chunkSize: int): ?!Poseidon2Hash =
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## Hashes chunks of data with a sponge of rate 2, and combines the
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## resulting chunk hashes in a merkle root.
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##
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(? Poseidon2Tree.digestTree(bytes, chunkSize)).root
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func digestMhash*(
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_: type Poseidon2Tree,
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bytes: openArray[byte], chunkSize: int): ?!MultiHash =
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## Hashes chunks of data with a sponge of rate 2 and
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## returns the multihash of the root
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##
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let
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hash = ? Poseidon2Tree.digest(bytes, chunkSize)
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? MultiHash.init(Pos2Bn128MrklCodec, hash).mapFailure
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