126 lines
3.9 KiB
Nim
126 lines
3.9 KiB
Nim
# Nimbus
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# Copyright (c) 2021-2023 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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# As per spec:
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# https://github.com/ethereum/portal-network-specs/blob/master/state-network.md#content-keys-and-content-ids
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{.push raises: [].}
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import
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nimcrypto/[hash, sha2, keccak], stew/[objects, results], stint,
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ssz_serialization,
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../../common/common_types
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export ssz_serialization, common_types, hash, results
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type
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NodeHash* = MDigest[32 * 8] # keccak256
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CodeHash* = MDigest[32 * 8] # keccak256
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Address* = array[20, byte]
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ContentType* = enum
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accountTrieNode = 0x00
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contractStorageTrieNode = 0x01
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accountTrieProof = 0x02
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contractStorageTrieProof = 0x03
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contractBytecode = 0x04
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AccountTrieNodeKey* = object
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path*: ByteList
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nodeHash*: NodeHash
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stateRoot*: Bytes32
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ContractStorageTrieNodeKey* = object
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address*: Address
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path*: ByteList
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nodeHash*: NodeHash
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stateRoot*: Bytes32
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AccountTrieProofKey* = object
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address*: Address
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stateRoot*: Bytes32
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ContractStorageTrieProofKey* = object
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address*: Address
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slot*: UInt256
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stateRoot*: Bytes32
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ContractBytecodeKey* = object
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address*: Address
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codeHash*: CodeHash
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ContentKey* = object
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case contentType*: ContentType
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of accountTrieNode:
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accountTrieNodeKey*: AccountTrieNodeKey
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of contractStorageTrieNode:
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contractStorageTrieNodeKey*: ContractStorageTrieNodeKey
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of accountTrieProof:
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accountTrieProofKey*: AccountTrieProofKey
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of contractStorageTrieProof:
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contractStorageTrieProofKey*: ContractStorageTrieProofKey
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of contractBytecode:
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contractBytecodeKey*: ContractBytecodeKey
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func encode*(contentKey: ContentKey): ByteList =
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ByteList.init(SSZ.encode(contentKey))
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func decode*(contentKey: ByteList): Opt[ContentKey] =
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try:
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Opt.some(SSZ.decode(contentKey.asSeq(), ContentKey))
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except SszError:
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return Opt.none(ContentKey)
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template computeContentId*(digestCtxType: type, body: untyped): ContentId =
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var h {.inject.}: digestCtxType
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init(h)
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body
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let idHash = finish(h)
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readUintBE[256](idHash.data)
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func toContentId*(contentKey: ContentKey): ContentId =
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case contentKey.contentType:
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of accountTrieNode: # sha256(path | node_hash)
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let key = contentKey.accountTrieNodeKey
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computeContentId sha256:
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h.update(key.path.asSeq())
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h.update(key.nodeHash.data)
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of contractStorageTrieNode: # sha256(address | path | node_hash)
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let key = contentKey.contractStorageTrieNodeKey
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computeContentId sha256:
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h.update(key.address)
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h.update(key.path.asSeq())
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h.update(key.nodeHash.data)
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of accountTrieProof: # keccak(address)
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let key = contentKey.accountTrieProofKey
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computeContentId keccak256:
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h.update(key.address)
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of contractStorageTrieProof: # (keccak(address) + keccak(slot)) % 2**256
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# TODO: Why is keccak run on slot, when it can be used directly?
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# Also, value to LE or BE? Not mentioned in specification.
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let key = contentKey.contractStorageTrieProofKey
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let n1 =
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block: computeContentId keccak256:
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h.update(key.address)
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let n2 =
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block: computeContentId keccak256:
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h.update(toBytesBE(key.slot))
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n1 + n2 # uint256 will wrap arround, practically applying the modulo 256
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of contractBytecode: # sha256(address | code_hash)
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let key = contentKey.contractBytecodeKey
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computeContentId sha256:
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h.update(key.address)
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h.update(key.codeHash.data)
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func toContentId*(contentKey: ByteList): results.Opt[ContentId] =
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let key = decode(contentKey)
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if key.isSome():
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ok(key.get().toContentId())
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else:
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Opt.none(ContentId)
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