72 lines
2.0 KiB
Nim
72 lines
2.0 KiB
Nim
# Nimbus
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# Copyright (c) 2018-2024 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
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# http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
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# http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed except
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# according to those terms.
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## EVM Opcode Handlers: Hashes
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## ===========================
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##
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{.push raises: [].}
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import
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../../../constants,
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../../evm_errors,
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../../computation,
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../../memory,
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../../stack,
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../gas_costs,
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../op_codes,
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./oph_defs,
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eth/common
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# ------------------------------------------------------------------------------
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# Private, op handlers implementation
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# ------------------------------------------------------------------------------
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proc sha3Op(cpt: VmCpt): EvmResultVoid =
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## 0x20, Compute Keccak-256 hash.
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? cpt.stack.lsCheck(2)
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let
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pos = cpt.stack.lsPeekSafeInt(^1)
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len = cpt.stack.lsPeekSafeInt(^2)
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cpt.stack.lsShrink(1)
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if pos < 0 or len < 0 or pos > 2147483648'i64:
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return err(opErr(OutOfBounds))
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? cpt.opcodeGasCost(Op.Sha3,
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cpt.gasCosts[Op.Sha3].m_handler(cpt.memory.len, pos, len),
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reason = "SHA3: word gas cost")
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cpt.memory.extend(pos, len)
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let endRange = min(pos + len, cpt.memory.len) - 1
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if endRange == -1 or pos >= cpt.memory.len:
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cpt.stack.lsTop(EMPTY_SHA3)
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else:
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cpt.stack.lsTop keccakHash cpt.memory.bytes.toOpenArray(pos, endRange)
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ok()
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# ------------------------------------------------------------------------------
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# Public, op exec table entries
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# ------------------------------------------------------------------------------
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const
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VmOpExecHash*: seq[VmOpExec] = @[
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(opCode: Op.Sha3, ## 0x20, Keccak-256
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forks: VmOpAllForks,
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name: "sha3",
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info: "Compute Keccak-256 hash",
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exec: sha3Op)]
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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