110 lines
2.7 KiB
Nim
110 lines
2.7 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 std/sequtils
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import pkg/poseidon2
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import pkg/constantine/math/io/io_fields
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import pkg/constantine/platforms/abstractions
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import pkg/questionable/results
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import ../utils
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import ../rng
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import ./merkletree
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export merkletree, poseidon2
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const
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KeyNoneF = F.fromhex("0x0")
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KeyBottomLayerF = F.fromhex("0x1")
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KeyOddF = F.fromhex("0x2")
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KeyOddAndBottomLayerF = F.fromhex("0x3")
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Poseidon2Zero* = zero
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type
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Poseidon2Hash* = F
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PoseidonKeysEnum* = enum # can't use non-ordinals as enum values
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KeyNone
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KeyBottomLayer
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KeyOdd
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KeyOddAndBottomLayer
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Poseidon2Tree* = MerkleTree[Poseidon2Hash, PoseidonKeysEnum]
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Poseidon2Proof* = MerkleProof[Poseidon2Hash, PoseidonKeysEnum]
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func toArray32*(bytes: openArray[byte]): array[32, byte] =
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result[0..<bytes.len] = bytes[0..<bytes.len]
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converter toKey*(key: PoseidonKeysEnum): Poseidon2Hash =
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case key:
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of KeyNone: KeyNoneF
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of KeyBottomLayer: KeyBottomLayerF
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of KeyOdd: KeyOddF
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of KeyOddAndBottomLayer: KeyOddAndBottomLayerF
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func init*(
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_: type Poseidon2Tree,
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leaves: openArray[Poseidon2Hash]): ?!Poseidon2Tree =
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if leaves.len == 0:
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return failure "Empty leaves"
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let
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compressor = proc(
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x, y: Poseidon2Hash,
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key: PoseidonKeysEnum): ?!Poseidon2Hash {.noSideEffect.} =
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success compress( x, y, key.toKey )
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var
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self = Poseidon2Tree(compress: compressor, zero: Poseidon2Zero)
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self.layers = ? merkleTreeWorker(self, leaves, isBottomLayer = true)
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success self
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func init*(
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_: type Poseidon2Tree,
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leaves: openArray[array[31, byte]]): ?!Poseidon2Tree =
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Poseidon2Tree.init(
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leaves.mapIt( Poseidon2Hash.fromBytes(it) ))
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proc fromNodes*(
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_: type Poseidon2Tree,
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nodes: openArray[Poseidon2Hash],
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nleaves: int): ?!Poseidon2Tree =
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if nodes.len == 0:
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return failure "Empty nodes"
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let
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compressor = proc(
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x, y: Poseidon2Hash,
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key: PoseidonKeysEnum): ?!Poseidon2Hash {.noSideEffect.} =
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success compress( x, y, key.toKey )
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var
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self = Poseidon2Tree(compress: compressor, zero: zero)
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layer = nleaves
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pos = 0
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while pos < nodes.len:
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self.layers.add( nodes[pos..<(pos + layer)] )
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pos += layer
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layer = divUp(layer, 2)
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let
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index = Rng.instance.rand(nleaves - 1)
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proof = ? self.getProof(index)
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? proof.verify(self.leaves[index], ? self.root) # sanity check
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success self
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