Restructure code to expose the internal hasher: #19
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- expose NmtHasher API s.t. it can be used to construct and use NMT Hashsers externally (e.g. for IPLD multihashers) - Add two functions Sha256Namespace8FlaggedLeaf, Sha256Namespace8FlaggedInner whose signature matches regular hash functions that simplify the above even further
Codecov Report
@@ Coverage Diff @@
## master #19 +/- ##
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+ Coverage 95.30% 95.39% +0.09%
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Files 7 7
Lines 298 304 +6
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+ Hits 284 290 +6
Misses 10 10
Partials 4 4
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liamsi
commented
Feb 13, 2021
hasher.go
Outdated
Comment on lines
20
to
51
| var defaultHasher = NewNmtHasher(sha256.New(), DefaultNamespaceIDLen, true) | ||
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| // Sha256Namespace8FlaggedLeaf uses sha256 as a base-hasher, 8 bytes | ||
| // for the namespace IDs and ignores the maximum possible namespace. | ||
| // | ||
| // Sha256Namespace8FlaggedLeaf(namespacedData) results in: | ||
| // ns(rawData) || ns(rawData) || sha256(LeafPrefix || rawData), | ||
| // where rawData is the leaf's data minus the namespace.ID prefix | ||
| // (namely namespacedData[NamespaceLen:]). | ||
| // | ||
| // Note that for the input len(namespacedData) >= DefaultNamespaceIDLen has to hold. | ||
| // If the input does not fulfil this, we will panic. | ||
| // The output will be of length 2*DefaultNamespaceIDLen+sha256.Size = 48 bytes. | ||
| func Sha256Namespace8FlaggedLeaf(namespacedData []byte) []byte { | ||
| return defaultHasher.HashLeaf(namespacedData) | ||
| } | ||
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| // Sha256Namespace8FlaggedInner hashes inner nodes to: | ||
| // minNID || maxNID || sha256(NodePrefix || leftRight), where leftRight consists of the full | ||
| // left and right child node bytes, including their respective min and max namespace IDs. | ||
| // Hence, the input has to be of size: | ||
| // 48 = 32 + 8 + 8 = sha256.Size + 2*DefaultNamespaceIDLen bytes. | ||
| // If the input does not fulfil this, we will panic. | ||
| // The output will also be of length 2*DefaultNamespaceIDLen+sha256.Size = 48 bytes. | ||
| func Sha256Namespace8FlaggedInner(leftRight []byte) []byte { | ||
| const flagLen = DefaultNamespaceIDLen * 2 | ||
| sha256Len := defaultHasher.Size() | ||
| left := leftRight[flagLen:+sha256Len] | ||
| right := leftRight[flagLen+sha256Len:] | ||
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| return defaultHasher.HashNode(left, right) | ||
| } |
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Adding these 2 methods is the only real change. Everything else is moving existing code from the internal package to the main nmt one, and, deleting some no longer needed code/abstractions.
liamsi
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Feb 13, 2021
- use hasher from nmt instead of redefining the logic in multihash or here (see celestiaorg/nmt#19) - remove multihash fork and use updated go-verifcid - minor renaming and refactoring
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liamsi
added a commit
to celestiaorg/celestia-core
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Feb 13, 2021
- use hasher from nmt instead of redefining the logic in multihash or here (see celestiaorg/nmt#19) - remove multihash fork and use updated go-verifcid - minor renaming and refactoring
liamsi
requested review from
adlerjohn,
evan-forbes,
tac0turtle,
musalbas and
tzdybal
tzdybal
approved these changes
Feb 15, 2021
| return n.NamespaceLen | ||
| } | ||
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| func NewNmtHasher(baseHasher hash.Hash, nidLen namespace.IDSize, ignoreMaxNamespace bool) *Hasher { |
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As this method is in nmt package, it can be named NewHasher.
evan-forbes
approved these changes
Feb 15, 2021
liamsi
added a commit
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Feb 19, 2021
* change plugin package * update to new rsmt2d API and update go.mod * Moved (pre)loading the plugin to init() of the plugin package itself * minor clarification with regard to the skipped test * refactor plugin to be more easily usable as a lib * Use cid.Undef and remove obsolete comment * use that lazyledger/go-ipfs fork * use ll go-verifcid and go-ipfs fork in main ll-core package too * update forks to latest version * replace deps in plugin and reorg in ll-core * bump ipfs related versions * Register custom hasher from plugin code instead of in go-multihash fork - use hasher from nmt instead of redefining the logic in multihash or here (see celestiaorg/nmt#19) - remove multihash fork and use updated go-verifcid - minor renaming and refactoring * update nmt and assert that the hashFunc is registered * small test to validate verifcid allows our hasher * actually skip test * use remote instead of local go-ipfs repo * clean up Makefile, remove set-taget, and add comment about building locally (in Readme) and remove ipfs dependency from ll-core module (this will be part of #152 instead) * review feedback: rename to mustRegisterNamespacedCodec * more review feedback: rename to mustRegisterNamespacedCodec and make sure the codec isn't already known * update nmt too * address nits: remove some unnecessary else statements * Update p2p/ipld/README.md Co-authored-by: John Adler <[email protected]> * s/defaulLength/defaultLength * Update p2p/ipld/plugin/nodes/nodes.go Co-authored-by: John Adler <[email protected]> * Deduplicate nmtHashSize * implement Copy * fix Tree implementation * Address more review comments: - rename share to namespacedLeaf - fix doc comment "When you realize you forgot to Load more https://www.youtube.com/watch?v=8yGfQak-q9M" * Add clarifying comment to `DataSquareRowOrColumnRawInputParser` and rename constant * minor doc improvement Co-authored-by: John Adler <[email protected]>
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In celestiaorg/celestia-core#155 we want to register a custom multihash that matches those used by the nmt internally. Instead of duplicating the code for this (as in https://github.com/lazyledger/go-multihash/pull/1), we simply export the API to construct an nmt hasher.
Sha256Namespace8FlaggedLeaf,Sha256Namespace8FlaggedInnerwhose signature matches regular hash functions that simplify the above even furtherTODOs:
Sha256Namespace8FlaggedLeaf,Sha256Namespace8FlaggedInnercloses: #18