mirror of https://github.com/status-im/nim-eth.git
47 lines
1.5 KiB
Nim
47 lines
1.5 KiB
Nim
# Copyright (c) 2022-2023 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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{.push raises: [].}
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## keccak256 is used across ethereum as the "default" hash function and this
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## module provides a type and some helpers to produce such hashes
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import
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nimcrypto/[keccak, hash]
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export
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keccak.update, keccak.finish, hash
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type
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KeccakHash* = MDigest[256]
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## A hash value computed using keccak256
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## note: this aliases Eth2Digest too, which uses a different hash!
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template withKeccakHash*(body: untyped): KeccakHash =
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## This little helper will init the hash function and return the sliced
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## hash:
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## let hashOfData = withHash: h.update(data)
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block:
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var h {.inject.}: keccak256
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# init(h) # not needed for new instance
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body
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finish(h)
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func keccakHash*(input: openArray[byte]): KeccakHash {.noinit.} =
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# We use the init-update-finish interface to avoid
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# the expensive burning/clearing memory (20~30% perf)
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var ctx: keccak256
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ctx.update(input)
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ctx.finish()
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func keccakHash*(input: openArray[char]): KeccakHash {.noinit.} =
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keccakHash(input.toOpenArrayByte(0, input.high()))
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func keccakHash*(a, b: openArray[byte]): KeccakHash =
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withKeccakHash:
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h.update a
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h.update b
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