c6631e555b
Port of C++ get_block_header_mining_hash(). Computes BlockHashingBlob with nonce=0, Keccak-256's it. CheckNonce wraps RandomX + difficulty. Co-Authored-By: Charon <charon@lethean.io>
52 lines
1.6 KiB
Go
52 lines
1.6 KiB
Go
// Copyright (c) 2017-2026 Lethean (https://lt.hn)
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//
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// Licensed under the European Union Public Licence (EUPL) version 1.2.
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// SPDX-License-Identifier: EUPL-1.2
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// Package mining provides a solo PoW miner that talks to a C++ daemon
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// via JSON-RPC. It fetches block templates, grinds nonces with RandomX,
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// and submits solutions.
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package mining
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import (
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"encoding/binary"
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"forge.lthn.ai/core/go-blockchain/consensus"
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"forge.lthn.ai/core/go-blockchain/crypto"
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"forge.lthn.ai/core/go-blockchain/types"
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"forge.lthn.ai/core/go-blockchain/wire"
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)
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// RandomXKey is the cache initialisation key for RandomX hashing.
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var RandomXKey = []byte("LetheanRandomXv1")
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// HeaderMiningHash computes the header hash used as input to RandomX.
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// The nonce in the block is set to 0 before computing the hash, matching
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// the C++ get_block_header_mining_hash() function.
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//
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// The result is deterministic for a given block template regardless of
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// the block's current nonce value.
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func HeaderMiningHash(b *types.Block) [32]byte {
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// Save and zero the nonce.
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savedNonce := b.Nonce
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b.Nonce = 0
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blob := wire.BlockHashingBlob(b)
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b.Nonce = savedNonce
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return wire.Keccak256(blob)
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}
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// CheckNonce tests whether a specific nonce produces a valid PoW solution
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// for the given header mining hash and difficulty.
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func CheckNonce(headerHash [32]byte, nonce, difficulty uint64) (bool, error) {
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var input [40]byte
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copy(input[:32], headerHash[:])
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binary.LittleEndian.PutUint64(input[32:], nonce)
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powHash, err := crypto.RandomXHash(RandomXKey, input[:])
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if err != nil {
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return false, err
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}
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return consensus.CheckDifficulty(types.Hash(powHash), difficulty), nil
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}
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