21 lines
1.0 KiB
Nim
21 lines
1.0 KiB
Nim
# Nimbus
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# Copyright (c) 2018 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) or http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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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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import
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../constants, ../utils_numeric, .. / utils / [keccak, bytes], .. / vm / [stack, memory, gas_meter], ../computation, ../vm_types, helpers, stint
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proc sha3op*(computation: var BaseComputation) =
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let (startPosition, size) = computation.stack.popInt(2)
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let (pos, len) = (startPosition.toInt, size.toInt)
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computation.extendMemory(pos, len)
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let sha3Bytes = computation.memory.read(pos, len)
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let wordCount = sha3Bytes.len.ceil32 div 32 # TODO, can't we just shr instead of rounding + div
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let gasCost = constants.GAS_SHA3_WORD * wordCount
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computation.gasMeter.consumeGas(gasCost, reason="SHA3: word gas cost")
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var res = keccak("")
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pushRes()
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