72 lines
2.2 KiB
Nim
72 lines
2.2 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
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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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import
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../../../constants,
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../../../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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../gas_meter,
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../op_codes,
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../utils/utils_numeric,
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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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const
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sha3Op: Vm2OpFn = proc (k: var Vm2Ctx) =
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## 0x20, Compute Keccak-256 hash.
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let (startPos, length) = k.cpt.stack.popInt(2)
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let (pos, len) = (startPos.safeInt, length.safeInt)
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if pos < 0 or len < 0 or pos > 2147483648'i64:
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raise newException(OutOfBoundsRead, "Out of bounds memory access")
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k.cpt.gasMeter.consumeGas(
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k.cpt.gasCosts[Op.Sha3].m_handler(k.cpt.memory.len, pos, len),
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reason = "SHA3: word gas cost")
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k.cpt.memory.extend(pos, len)
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let endRange = min(pos + len, k.cpt.memory.len) - 1
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if endRange == -1 or pos >= k.cpt.memory.len:
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k.cpt.stack.push(EMPTY_SHA3)
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else:
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k.cpt.stack.push:
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keccakHash k.cpt.memory.bytes.toOpenArray(pos, endRange)
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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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vm2OpExecHash*: seq[Vm2OpExec] = @[
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(opCode: Op.Sha3, ## 0x20, Keccak-256
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forks: Vm2OpAllForks,
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name: "sha3",
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info: "Compute Keccak-256 hash",
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exec: (prep: vm2OpIgnore,
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run: sha3Op,
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post: vm2OpIgnore))]
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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