core, consensus: pluggable consensus engines (#3817)

This commit adds pluggable consensus engines to go-ethereum. In short, it
introduces a generic consensus interface, and refactors the entire codebase to
use this interface.

8 files changed, 0 insertions, 2759 deletions

diff --git a/pow/ethash.go b/pow/ethash.go
deleted file mode 100644
index 9adc38540..000000000
--- a/pow/ethash.go
+++ /dev/null
@@ -1,589 +0,0 @@
-// Copyright 2017 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package pow
-
-import (
-	"bytes"
-	"errors"
-	"fmt"
-	"math"
-	"math/big"
-	"math/rand"
-	"os"
-	"path/filepath"
-	"reflect"
-	"strconv"
-	"sync"
-	"time"
-	"unsafe"
-
-	mmap "github.com/edsrzf/mmap-go"
-	"github.com/ethereum/go-ethereum/log"
-	metrics "github.com/rcrowley/go-metrics"
-)
-
-var (
-	ErrInvalidDumpMagic  = errors.New("invalid dump magic")
-	ErrNonceOutOfRange   = errors.New("nonce out of range")
-	ErrInvalidDifficulty = errors.New("non-positive difficulty")
-	ErrInvalidMixDigest  = errors.New("invalid mix digest")
-	ErrInvalidPoW        = errors.New("pow difficulty invalid")
-)
-
-var (
-	// maxUint256 is a big integer representing 2^256-1
-	maxUint256 = new(big.Int).Exp(big.NewInt(2), big.NewInt(256), big.NewInt(0))
-
-	// sharedEthash is a full instance that can be shared between multiple users.
-	sharedEthash = NewFullEthash("", 3, 0, "", 1, 0)
-
-	// algorithmRevision is the data structure version used for file naming.
-	algorithmRevision = 23
-
-	// dumpMagic is a dataset dump header to sanity check a data dump.
-	dumpMagic = []uint32{0xbaddcafe, 0xfee1dead}
-)
-
-// isLittleEndian returns whether the local system is running in little or big
-// endian byte order.
-func isLittleEndian() bool {
-	n := uint32(0x01020304)
-	return *(*byte)(unsafe.Pointer(&n)) == 0x04
-}
-
-// memoryMap tries to memory map a file of uint32s for read only access.
-func memoryMap(path string) (*os.File, mmap.MMap, []uint32, error) {
-	file, err := os.OpenFile(path, os.O_RDONLY, 0644)
-	if err != nil {
-		return nil, nil, nil, err
-	}
-	mem, buffer, err := memoryMapFile(file, false)
-	if err != nil {
-		file.Close()
-		return nil, nil, nil, err
-	}
-	for i, magic := range dumpMagic {
-		if buffer[i] != magic {
-			mem.Unmap()
-			file.Close()
-			return nil, nil, nil, ErrInvalidDumpMagic
-		}
-	}
-	return file, mem, buffer[len(dumpMagic):], err
-}
-
-// memoryMapFile tries to memory map an already opened file descriptor.
-func memoryMapFile(file *os.File, write bool) (mmap.MMap, []uint32, error) {
-	// Try to memory map the file
-	flag := mmap.RDONLY
-	if write {
-		flag = mmap.RDWR
-	}
-	mem, err := mmap.Map(file, flag, 0)
-	if err != nil {
-		return nil, nil, err
-	}
-	// Yay, we managed to memory map the file, here be dragons
-	header := *(*reflect.SliceHeader)(unsafe.Pointer(&mem))
-	header.Len /= 4
-	header.Cap /= 4
-
-	return mem, *(*[]uint32)(unsafe.Pointer(&header)), nil
-}
-
-// memoryMapAndGenerate tries to memory map a temporary file of uint32s for write
-// access, fill it with the data from a generator and then move it into the final
-// path requested.
-func memoryMapAndGenerate(path string, size uint64, generator func(buffer []uint32)) (*os.File, mmap.MMap, []uint32, error) {
-	// Ensure the data folder exists
-	if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
-		return nil, nil, nil, err
-	}
-	// Create a huge temporary empty file to fill with data
-	temp := path + "." + strconv.Itoa(rand.Int())
-
-	dump, err := os.Create(temp)
-	if err != nil {
-		return nil, nil, nil, err
-	}
-	if err = dump.Truncate(int64(len(dumpMagic))*4 + int64(size)); err != nil {
-		return nil, nil, nil, err
-	}
-	// Memory map the file for writing and fill it with the generator
-	mem, buffer, err := memoryMapFile(dump, true)
-	if err != nil {
-		dump.Close()
-		return nil, nil, nil, err
-	}
-	copy(buffer, dumpMagic)
-
-	data := buffer[len(dumpMagic):]
-	generator(data)
-
-	if err := mem.Flush(); err != nil {
-		mem.Unmap()
-		dump.Close()
-		return nil, nil, nil, err
-	}
-	os.Rename(temp, path)
-	return dump, mem, data, nil
-}
-
-// cache wraps an ethash cache with some metadata to allow easier concurrent use.
-type cache struct {
-	epoch uint64 // Epoch for which this cache is relevant
-
-	dump *os.File  // File descriptor of the memory mapped cache
-	mmap mmap.MMap // Memory map itself to unmap before releasing
-
-	cache []uint32   // The actual cache data content (may be memory mapped)
-	used  time.Time  // Timestamp of the last use for smarter eviction
-	once  sync.Once  // Ensures the cache is generated only once
-	lock  sync.Mutex // Ensures thread safety for updating the usage time
-}
-
-// generate ensures that the cache content is generated before use.
-func (c *cache) generate(dir string, limit int, test bool) {
-	c.once.Do(func() {
-		// If we have a testing cache, generate and return
-		if test {
-			c.cache = make([]uint32, 1024/4)
-			generateCache(c.cache, c.epoch, seedHash(c.epoch*epochLength+1))
-			return
-		}
-		// If we don't store anything on disk, generate and return
-		size := cacheSize(c.epoch*epochLength + 1)
-		seed := seedHash(c.epoch*epochLength + 1)
-
-		if dir == "" {
-			c.cache = make([]uint32, size/4)
-			generateCache(c.cache, c.epoch, seed)
-			return
-		}
-		// Disk storage is needed, this will get fancy
-		var endian string
-		if !isLittleEndian() {
-			endian = ".be"
-		}
-		path := filepath.Join(dir, fmt.Sprintf("cache-R%d-%x%s", algorithmRevision, seed[:8], endian))
-		logger := log.New("epoch", c.epoch)
-
-		// Try to load the file from disk and memory map it
-		var err error
-		c.dump, c.mmap, c.cache, err = memoryMap(path)
-		if err == nil {
-			logger.Debug("Loaded old ethash cache from disk")
-			return
-		}
-		logger.Debug("Failed to load old ethash cache", "err", err)
-
-		// No previous cache available, create a new cache file to fill
-		c.dump, c.mmap, c.cache, err = memoryMapAndGenerate(path, size, func(buffer []uint32) { generateCache(buffer, c.epoch, seed) })
-		if err != nil {
-			logger.Error("Failed to generate mapped ethash cache", "err", err)
-
-			c.cache = make([]uint32, size/4)
-			generateCache(c.cache, c.epoch, seed)
-		}
-		// Iterate over all previous instances and delete old ones
-		for ep := int(c.epoch) - limit; ep >= 0; ep-- {
-			seed := seedHash(uint64(ep)*epochLength + 1)
-			path := filepath.Join(dir, fmt.Sprintf("cache-R%d-%x%s", algorithmRevision, seed[:8], endian))
-			os.Remove(path)
-		}
-	})
-}
-
-// release closes any file handlers and memory maps open.
-func (c *cache) release() {
-	if c.mmap != nil {
-		c.mmap.Unmap()
-		c.mmap = nil
-	}
-	if c.dump != nil {
-		c.dump.Close()
-		c.dump = nil
-	}
-}
-
-// dataset wraps an ethash dataset with some metadata to allow easier concurrent use.
-type dataset struct {
-	epoch uint64 // Epoch for which this cache is relevant
-
-	dump *os.File  // File descriptor of the memory mapped cache
-	mmap mmap.MMap // Memory map itself to unmap before releasing
-
-	dataset []uint32   // The actual cache data content
-	used    time.Time  // Timestamp of the last use for smarter eviction
-	once    sync.Once  // Ensures the cache is generated only once
-	lock    sync.Mutex // Ensures thread safety for updating the usage time
-}
-
-// generate ensures that the dataset content is generated before use.
-func (d *dataset) generate(dir string, limit int, test bool) {
-	d.once.Do(func() {
-		// If we have a testing dataset, generate and return
-		if test {
-			cache := make([]uint32, 1024/4)
-			generateCache(cache, d.epoch, seedHash(d.epoch*epochLength+1))
-
-			d.dataset = make([]uint32, 32*1024/4)
-			generateDataset(d.dataset, d.epoch, cache)
-
-			return
-		}
-		// If we don't store anything on disk, generate and return
-		csize := cacheSize(d.epoch*epochLength + 1)
-		dsize := datasetSize(d.epoch*epochLength + 1)
-		seed := seedHash(d.epoch*epochLength + 1)
-
-		if dir == "" {
-			cache := make([]uint32, csize/4)
-			generateCache(cache, d.epoch, seed)
-
-			d.dataset = make([]uint32, dsize/4)
-			generateDataset(d.dataset, d.epoch, cache)
-		}
-		// Disk storage is needed, this will get fancy
-		var endian string
-		if !isLittleEndian() {
-			endian = ".be"
-		}
-		path := filepath.Join(dir, fmt.Sprintf("full-R%d-%x%s", algorithmRevision, seed[:8], endian))
-		logger := log.New("epoch", d.epoch)
-
-		// Try to load the file from disk and memory map it
-		var err error
-		d.dump, d.mmap, d.dataset, err = memoryMap(path)
-		if err == nil {
-			logger.Debug("Loaded old ethash dataset from disk")
-			return
-		}
-		logger.Debug("Failed to load old ethash dataset", "err", err)
-
-		// No previous dataset available, create a new dataset file to fill
-		cache := make([]uint32, csize/4)
-		generateCache(cache, d.epoch, seed)
-
-		d.dump, d.mmap, d.dataset, err = memoryMapAndGenerate(path, dsize, func(buffer []uint32) { generateDataset(buffer, d.epoch, cache) })
-		if err != nil {
-			logger.Error("Failed to generate mapped ethash dataset", "err", err)
-
-			d.dataset = make([]uint32, dsize/2)
-			generateDataset(d.dataset, d.epoch, cache)
-		}
-		// Iterate over all previous instances and delete old ones
-		for ep := int(d.epoch) - limit; ep >= 0; ep-- {
-			seed := seedHash(uint64(ep)*epochLength + 1)
-			path := filepath.Join(dir, fmt.Sprintf("full-R%d-%x%s", algorithmRevision, seed[:8], endian))
-			os.Remove(path)
-		}
-	})
-}
-
-// release closes any file handlers and memory maps open.
-func (d *dataset) release() {
-	if d.mmap != nil {
-		d.mmap.Unmap()
-		d.mmap = nil
-	}
-	if d.dump != nil {
-		d.dump.Close()
-		d.dump = nil
-	}
-}
-
-// MakeCache generates a new ethash cache and optionally stores it to disk.
-func MakeCache(block uint64, dir string) {
-	c := cache{epoch: block/epochLength + 1}
-	c.generate(dir, math.MaxInt32, false)
-	c.release()
-}
-
-// MakeDataset generates a new ethash dataset and optionally stores it to disk.
-func MakeDataset(block uint64, dir string) {
-	d := dataset{epoch: block/epochLength + 1}
-	d.generate(dir, math.MaxInt32, false)
-	d.release()
-}
-
-// Ethash is a PoW data struture implementing the ethash algorithm.
-type Ethash struct {
-	cachedir     string // Data directory to store the verification caches
-	cachesinmem  int    // Number of caches to keep in memory
-	cachesondisk int    // Number of caches to keep on disk
-	dagdir       string // Data directory to store full mining datasets
-	dagsinmem    int    // Number of mining datasets to keep in memory
-	dagsondisk   int    // Number of mining datasets to keep on disk
-
-	caches   map[uint64]*cache   // In memory caches to avoid regenerating too often
-	fcache   *cache              // Pre-generated cache for the estimated future epoch
-	datasets map[uint64]*dataset // In memory datasets to avoid regenerating too often
-	fdataset *dataset            // Pre-generated dataset for the estimated future epoch
-	lock     sync.Mutex          // Ensures thread safety for the in-memory caches
-
-	hashrate metrics.Meter // Meter tracking the average hashrate
-
-	tester bool // Flag whether to use a smaller test dataset
-}
-
-// NewFullEthash creates a full sized ethash PoW scheme.
-func NewFullEthash(cachedir string, cachesinmem, cachesondisk int, dagdir string, dagsinmem, dagsondisk int) PoW {
-	if cachesinmem <= 0 {
-		log.Warn("One ethash cache must alwast be in memory", "requested", cachesinmem)
-		cachesinmem = 1
-	}
-	if cachedir != "" && cachesondisk > 0 {
-		log.Info("Disk storage enabled for ethash caches", "dir", cachedir, "count", cachesondisk)
-	}
-	if dagdir != "" && dagsondisk > 0 {
-		log.Info("Disk storage enabled for ethash DAGs", "dir", dagdir, "count", dagsondisk)
-	}
-	return &Ethash{
-		cachedir:     cachedir,
-		cachesinmem:  cachesinmem,
-		cachesondisk: cachesondisk,
-		dagdir:       dagdir,
-		dagsinmem:    dagsinmem,
-		dagsondisk:   dagsondisk,
-		caches:       make(map[uint64]*cache),
-		datasets:     make(map[uint64]*dataset),
-		hashrate:     metrics.NewMeter(),
-	}
-}
-
-// NewTestEthash creates a small sized ethash PoW scheme useful only for testing
-// purposes.
-func NewTestEthash() PoW {
-	return &Ethash{
-		cachesinmem: 1,
-		caches:      make(map[uint64]*cache),
-		datasets:    make(map[uint64]*dataset),
-		tester:      true,
-		hashrate:    metrics.NewMeter(),
-	}
-}
-
-// NewSharedEthash creates a full sized ethash PoW shared between all requesters
-// running in the same process.
-func NewSharedEthash() PoW {
-	return sharedEthash
-}
-
-// Verify implements PoW, checking whether the given block satisfies the PoW
-// difficulty requirements.
-func (ethash *Ethash) Verify(block Block) error {
-	// Sanity check that the block number is below the lookup table size (60M blocks)
-	number := block.NumberU64()
-	if number/epochLength >= uint64(len(cacheSizes)) {
-		// Go < 1.7 cannot calculate new cache/dataset sizes (no fast prime check)
-		return ErrNonceOutOfRange
-	}
-	// Ensure that we have a valid difficulty for the block
-	difficulty := block.Difficulty()
-	if difficulty.Sign() <= 0 {
-		return ErrInvalidDifficulty
-	}
-	// Recompute the digest and PoW value and verify against the block
-	cache := ethash.cache(number)
-
-	size := datasetSize(number)
-	if ethash.tester {
-		size = 32 * 1024
-	}
-	digest, result := hashimotoLight(size, cache, block.HashNoNonce().Bytes(), block.Nonce())
-	if !bytes.Equal(block.MixDigest().Bytes(), digest) {
-		return ErrInvalidMixDigest
-	}
-	target := new(big.Int).Div(maxUint256, difficulty)
-	if new(big.Int).SetBytes(result).Cmp(target) > 0 {
-		return ErrInvalidPoW
-	}
-	return nil
-}
-
-// cache tries to retrieve a verification cache for the specified block number
-// by first checking against a list of in-memory caches, then against caches
-// stored on disk, and finally generating one if none can be found.
-func (ethash *Ethash) cache(block uint64) []uint32 {
-	epoch := block / epochLength
-
-	// If we have a PoW for that epoch, use that
-	ethash.lock.Lock()
-
-	current, future := ethash.caches[epoch], (*cache)(nil)
-	if current == nil {
-		// No in-memory cache, evict the oldest if the cache limit was reached
-		for len(ethash.caches) > 0 && len(ethash.caches) >= ethash.cachesinmem {
-			var evict *cache
-			for _, cache := range ethash.caches {
-				if evict == nil || evict.used.After(cache.used) {
-					evict = cache
-				}
-			}
-			delete(ethash.caches, evict.epoch)
-			evict.release()
-
-			log.Trace("Evicted ethash cache", "epoch", evict.epoch, "used", evict.used)
-		}
-		// If we have the new cache pre-generated, use that, otherwise create a new one
-		if ethash.fcache != nil && ethash.fcache.epoch == epoch {
-			log.Trace("Using pre-generated cache", "epoch", epoch)
-			current, ethash.fcache = ethash.fcache, nil
-		} else {
-			log.Trace("Requiring new ethash cache", "epoch", epoch)
-			current = &cache{epoch: epoch}
-		}
-		ethash.caches[epoch] = current
-
-		// If we just used up the future cache, or need a refresh, regenerate
-		if ethash.fcache == nil || ethash.fcache.epoch <= epoch {
-			if ethash.fcache != nil {
-				ethash.fcache.release()
-			}
-			log.Trace("Requiring new future ethash cache", "epoch", epoch+1)
-			future = &cache{epoch: epoch + 1}
-			ethash.fcache = future
-		}
-	}
-	current.used = time.Now()
-	ethash.lock.Unlock()
-
-	// Wait for generation finish, bump the timestamp and finalize the cache
-	current.generate(ethash.cachedir, ethash.cachesondisk, ethash.tester)
-
-	current.lock.Lock()
-	current.used = time.Now()
-	current.lock.Unlock()
-
-	// If we exhausted the future cache, now's a good time to regenerate it
-	if future != nil {
-		go future.generate(ethash.cachedir, ethash.cachesondisk, ethash.tester)
-	}
-	return current.cache
-}
-
-// Search implements PoW, attempting to find a nonce that satisfies the block's
-// difficulty requirements.
-func (ethash *Ethash) Search(block Block, stop <-chan struct{}) (uint64, []byte) {
-	var (
-		hash     = block.HashNoNonce().Bytes()
-		diff     = block.Difficulty()
-		target   = new(big.Int).Div(maxUint256, diff)
-		dataset  = ethash.dataset(block.NumberU64())
-		rand     = rand.New(rand.NewSource(time.Now().UnixNano()))
-		nonce    = uint64(rand.Int63())
-		attempts int64
-	)
-	// Start generating random nonces until we abort or find a good one
-	for {
-		select {
-		case <-stop:
-			// Mining terminated, update stats and abort
-			ethash.hashrate.Mark(attempts)
-			return 0, nil
-
-		default:
-			// We don't have to update hash rate on every nonce, so update after after 2^X nonces
-			attempts++
-			if (attempts % (1 << 15)) == 0 {
-				ethash.hashrate.Mark(attempts)
-				attempts = 0
-			}
-			// Compute the PoW value of this nonce
-			digest, result := hashimotoFull(dataset, hash, nonce)
-			if new(big.Int).SetBytes(result).Cmp(target) <= 0 {
-				return nonce, digest
-			}
-			nonce++
-		}
-	}
-}
-
-// dataset tries to retrieve a mining dataset for the specified block number
-// by first checking against a list of in-memory datasets, then against DAGs
-// stored on disk, and finally generating one if none can be found.
-func (ethash *Ethash) dataset(block uint64) []uint32 {
-	epoch := block / epochLength
-
-	// If we have a PoW for that epoch, use that
-	ethash.lock.Lock()
-
-	current, future := ethash.datasets[epoch], (*dataset)(nil)
-	if current == nil {
-		// No in-memory dataset, evict the oldest if the dataset limit was reached
-		for len(ethash.datasets) > 0 && len(ethash.datasets) >= ethash.dagsinmem {
-			var evict *dataset
-			for _, dataset := range ethash.datasets {
-				if evict == nil || evict.used.After(dataset.used) {
-					evict = dataset
-				}
-			}
-			delete(ethash.datasets, evict.epoch)
-			evict.release()
-
-			log.Trace("Evicted ethash dataset", "epoch", evict.epoch, "used", evict.used)
-		}
-		// If we have the new cache pre-generated, use that, otherwise create a new one
-		if ethash.fdataset != nil && ethash.fdataset.epoch == epoch {
-			log.Trace("Using pre-generated dataset", "epoch", epoch)
-			current = &dataset{epoch: ethash.fdataset.epoch} // Reload from disk
-			ethash.fdataset = nil
-		} else {
-			log.Trace("Requiring new ethash dataset", "epoch", epoch)
-			current = &dataset{epoch: epoch}
-		}
-		ethash.datasets[epoch] = current
-
-		// If we just used up the future dataset, or need a refresh, regenerate
-		if ethash.fdataset == nil || ethash.fdataset.epoch <= epoch {
-			if ethash.fdataset != nil {
-				ethash.fdataset.release()
-			}
-			log.Trace("Requiring new future ethash dataset", "epoch", epoch+1)
-			future = &dataset{epoch: epoch + 1}
-			ethash.fdataset = future
-		}
-	}
-	current.used = time.Now()
-	ethash.lock.Unlock()
-
-	// Wait for generation finish, bump the timestamp and finalize the cache
-	current.generate(ethash.dagdir, ethash.dagsondisk, ethash.tester)
-
-	current.lock.Lock()
-	current.used = time.Now()
-	current.lock.Unlock()
-
-	// If we exhausted the future dataset, now's a good time to regenerate it
-	if future != nil {
-		go future.generate(ethash.dagdir, ethash.dagsondisk, ethash.tester)
-	}
-	return current.dataset
-}
-
-// Hashrate implements PoW, returning the measured rate of the search invocations
-// per second over the last minute.
-func (ethash *Ethash) Hashrate() float64 {
-	return ethash.hashrate.Rate1()
-}
-
-// EthashSeedHash is the seed to use for generating a vrification cache and the
-// mining dataset.
-func EthashSeedHash(block uint64) []byte {
-	return seedHash(block)
-}
diff --git a/pow/ethash_algo.go b/pow/ethash_algo.go
deleted file mode 100644
index 1e996785f..000000000
--- a/pow/ethash_algo.go
+++ /dev/null
@@ -1,1103 +0,0 @@
-// Copyright 2017 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package pow
-
-import (
-	"encoding/binary"
-	"hash"
-	"reflect"
-	"runtime"
-	"sync"
-	"sync/atomic"
-	"time"
-	"unsafe"
-
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/crypto"
-	"github.com/ethereum/go-ethereum/crypto/sha3"
-	"github.com/ethereum/go-ethereum/log"
-)
-
-const (
-	datasetInitBytes   = 1 << 30 // Bytes in dataset at genesis
-	datasetGrowthBytes = 1 << 23 // Dataset growth per epoch
-	cacheInitBytes     = 1 << 24 // Bytes in cache at genesis
-	cacheGrowthBytes   = 1 << 17 // Cache growth per epoch
-	epochLength        = 30000   // Blocks per epoch
-	mixBytes           = 128     // Width of mix
-	hashBytes          = 64      // Hash length in bytes
-	hashWords          = 16      // Number of 32 bit ints in a hash
-	datasetParents     = 256     // Number of parents of each dataset element
-	cacheRounds        = 3       // Number of rounds in cache production
-	loopAccesses       = 64      // Number of accesses in hashimoto loop
-)
-
-// hasher is a repetitive hasher allowing the same hash data structures to be
-// reused between hash runs instead of requiring new ones to be created.
-type hasher func(dest []byte, data []byte)
-
-// makeHasher creates a repetitive hasher, allowing the same hash data structures
-// to be reused between hash runs instead of requiring new ones to be created.
-//
-// The returned function is not thread safe!
-func makeHasher(h hash.Hash) hasher {
-	return func(dest []byte, data []byte) {
-		h.Write(data)
-		h.Sum(dest[:0])
-		h.Reset()
-	}
-}
-
-// seedHash is the seed to use for generating a verification cache and the mining
-// dataset.
-func seedHash(block uint64) []byte {
-	seed := make([]byte, 32)
-	if block < epochLength {
-		return seed
-	}
-	keccak256 := makeHasher(sha3.NewKeccak256())
-	for i := 0; i < int(block/epochLength); i++ {
-		keccak256(seed, seed)
-	}
-	return seed
-}
-
-// generateCache creates a verification cache of a given size for an input seed.
-// The cache production process involves first sequentially filling up 32 MB of
-// memory, then performing two passes of Sergio Demian Lerner's RandMemoHash
-// algorithm from Strict Memory Hard Hashing Functions (2014). The output is a
-// set of 524288 64-byte values.
-//
-// This method places the result into dest in machine byte order.
-func generateCache(dest []uint32, epoch uint64, seed []byte) {
-	// Print some debug logs to allow analysis on low end devices
-	logger := log.New("epoch", epoch)
-
-	start := time.Now()
-	defer func() {
-		elapsed := time.Since(start)
-
-		logFn := logger.Debug
-		if elapsed > 3*time.Second {
-			logFn = logger.Info
-		}
-		logFn("Generated ethash verification cache", "elapsed", common.PrettyDuration(elapsed))
-	}()
-	// Convert our destination slice to a byte buffer
-	header := *(*reflect.SliceHeader)(unsafe.Pointer(&dest))
-	header.Len *= 4
-	header.Cap *= 4
-	cache := *(*[]byte)(unsafe.Pointer(&header))
-
-	// Calculate the number of thoretical rows (we'll store in one buffer nonetheless)
-	size := uint64(len(cache))
-	rows := int(size) / hashBytes
-
-	// Start a monitoring goroutine to report progress on low end devices
-	var progress uint32
-
-	done := make(chan struct{})
-	defer close(done)
-
-	go func() {
-		for {
-			select {
-			case <-done:
-				return
-			case <-time.After(3 * time.Second):
-				logger.Info("Generating ethash verification cache", "percentage", atomic.LoadUint32(&progress)*100/uint32(rows)/4, "elapsed", common.PrettyDuration(time.Since(start)))
-			}
-		}
-	}()
-	// Create a hasher to reuse between invocations
-	keccak512 := makeHasher(sha3.NewKeccak512())
-
-	// Sequentially produce the initial dataset
-	keccak512(cache, seed)
-	for offset := uint64(hashBytes); offset < size; offset += hashBytes {
-		keccak512(cache[offset:], cache[offset-hashBytes:offset])
-		atomic.AddUint32(&progress, 1)
-	}
-	// Use a low-round version of randmemohash
-	temp := make([]byte, hashBytes)
-
-	for i := 0; i < cacheRounds; i++ {
-		for j := 0; j < rows; j++ {
-			var (
-				srcOff = ((j - 1 + rows) % rows) * hashBytes
-				dstOff = j * hashBytes
-				xorOff = (binary.LittleEndian.Uint32(cache[dstOff:]) % uint32(rows)) * hashBytes
-			)
-			xorBytes(temp, cache[srcOff:srcOff+hashBytes], cache[xorOff:xorOff+hashBytes])
-			keccak512(cache[dstOff:], temp)
-
-			atomic.AddUint32(&progress, 1)
-		}
-	}
-	// Swap the byte order on big endian systems and return
-	if !isLittleEndian() {
-		swap(cache)
-	}
-}
-
-// swap changes the byte order of the buffer assuming a uint32 representation.
-func swap(buffer []byte) {
-	for i := 0; i < len(buffer); i += 4 {
-		binary.BigEndian.PutUint32(buffer[i:], binary.LittleEndian.Uint32(buffer[i:]))
-	}
-}
-
-// prepare converts an ethash cache or dataset from a byte stream into the internal
-// int representation. All ethash methods work with ints to avoid constant byte to
-// int conversions as well as to handle both little and big endian systems.
-func prepare(dest []uint32, src []byte) {
-	for i := 0; i < len(dest); i++ {
-		dest[i] = binary.LittleEndian.Uint32(src[i*4:])
-	}
-}
-
-// fnv is an algorithm inspired by the FNV hash, which in some cases is used as
-// a non-associative substitute for XOR. Note that we multiply the prime with
-// the full 32-bit input, in contrast with the FNV-1 spec which multiplies the
-// prime with one byte (octet) in turn.
-func fnv(a, b uint32) uint32 {
-	return a*0x01000193 ^ b
-}
-
-// fnvHash mixes in data into mix using the ethash fnv method.
-func fnvHash(mix []uint32, data []uint32) {
-	for i := 0; i < len(mix); i++ {
-		mix[i] = mix[i]*0x01000193 ^ data[i]
-	}
-}
-
-// generateDatasetItem combines data from 256 pseudorandomly selected cache nodes,
-// and hashes that to compute a single dataset node.
-func generateDatasetItem(cache []uint32, index uint32, keccak512 hasher) []byte {
-	// Calculate the number of thoretical rows (we use one buffer nonetheless)
-	rows := uint32(len(cache) / hashWords)
-
-	// Initialize the mix
-	mix := make([]byte, hashBytes)
-
-	binary.LittleEndian.PutUint32(mix, cache[(index%rows)*hashWords]^index)
-	for i := 1; i < hashWords; i++ {
-		binary.LittleEndian.PutUint32(mix[i*4:], cache[(index%rows)*hashWords+uint32(i)])
-	}
-	keccak512(mix, mix)
-
-	// Convert the mix to uint32s to avoid constant bit shifting
-	intMix := make([]uint32, hashWords)
-	for i := 0; i < len(intMix); i++ {
-		intMix[i] = binary.LittleEndian.Uint32(mix[i*4:])
-	}
-	// fnv it with a lot of random cache nodes based on index
-	for i := uint32(0); i < datasetParents; i++ {
-		parent := fnv(index^i, intMix[i%16]) % rows
-		fnvHash(intMix, cache[parent*hashWords:])
-	}
-	// Flatten the uint32 mix into a binary one and return
-	for i, val := range intMix {
-		binary.LittleEndian.PutUint32(mix[i*4:], val)
-	}
-	keccak512(mix, mix)
-	return mix
-}
-
-// generateDataset generates the entire ethash dataset for mining.
-//
-// This method places the result into dest in machine byte order.
-func generateDataset(dest []uint32, epoch uint64, cache []uint32) {
-	// Print some debug logs to allow analysis on low end devices
-	logger := log.New("epoch", epoch)
-
-	start := time.Now()
-	defer func() {
-		elapsed := time.Since(start)
-
-		logFn := logger.Debug
-		if elapsed > 3*time.Second {
-			logFn = logger.Info
-		}
-		logFn("Generated ethash verification cache", "elapsed", common.PrettyDuration(elapsed))
-	}()
-
-	// Figure out whether the bytes need to be swapped for the machine
-	swapped := !isLittleEndian()
-
-	// Convert our destination slice to a byte buffer
-	header := *(*reflect.SliceHeader)(unsafe.Pointer(&dest))
-	header.Len *= 4
-	header.Cap *= 4
-	dataset := *(*[]byte)(unsafe.Pointer(&header))
-
-	// Generate the dataset on many goroutines since it takes a while
-	threads := runtime.NumCPU()
-	size := uint64(len(dataset))
-
-	var pend sync.WaitGroup
-	pend.Add(threads)
-
-	var progress uint32
-	for i := 0; i < threads; i++ {
-		go func(id int) {
-			defer pend.Done()
-
-			// Create a hasher to reuse between invocations
-			keccak512 := makeHasher(sha3.NewKeccak512())
-
-			// Calculate the data segment this thread should generate
-			batch := uint32((size + hashBytes*uint64(threads) - 1) / (hashBytes * uint64(threads)))
-			first := uint32(id) * batch
-			limit := first + batch
-			if limit > uint32(size/hashBytes) {
-				limit = uint32(size / hashBytes)
-			}
-			// Calculate the dataset segment
-			percent := uint32(size / hashBytes / 100)
-			for index := first; index < limit; index++ {
-				item := generateDatasetItem(cache, index, keccak512)
-				if swapped {
-					swap(item)
-				}
-				copy(dataset[index*hashBytes:], item)
-
-				if status := atomic.AddUint32(&progress, 1); status%percent == 0 {
-					logger.Info("Generating DAG in progress", "percentage", uint64(status*100)/(size/hashBytes), "elapsed", common.PrettyDuration(time.Since(start)))
-				}
-			}
-		}(i)
-	}
-	// Wait for all the generators to finish and return
-	pend.Wait()
-}
-
-// hashimoto aggregates data from the full dataset in order to produce our final
-// value for a particular header hash and nonce.
-func hashimoto(hash []byte, nonce uint64, size uint64, lookup func(index uint32) []uint32) ([]byte, []byte) {
-	// Calculate the number of thoretical rows (we use one buffer nonetheless)
-	rows := uint32(size / mixBytes)
-
-	// Combine header+nonce into a 64 byte seed
-	seed := make([]byte, 40)
-	copy(seed, hash)
-	binary.LittleEndian.PutUint64(seed[32:], nonce)
-
-	seed = crypto.Keccak512(seed)
-	seedHead := binary.LittleEndian.Uint32(seed)
-
-	// Start the mix with replicated seed
-	mix := make([]uint32, mixBytes/4)
-	for i := 0; i < len(mix); i++ {
-		mix[i] = binary.LittleEndian.Uint32(seed[i%16*4:])
-	}
-	// Mix in random dataset nodes
-	temp := make([]uint32, len(mix))
-
-	for i := 0; i < loopAccesses; i++ {
-		parent := fnv(uint32(i)^seedHead, mix[i%len(mix)]) % rows
-		for j := uint32(0); j < mixBytes/hashBytes; j++ {
-			copy(temp[j*hashWords:], lookup(2*parent+j))
-		}
-		fnvHash(mix, temp)
-	}
-	// Compress mix
-	for i := 0; i < len(mix); i += 4 {
-		mix[i/4] = fnv(fnv(fnv(mix[i], mix[i+1]), mix[i+2]), mix[i+3])
-	}
-	mix = mix[:len(mix)/4]
-
-	digest := make([]byte, common.HashLength)
-	for i, val := range mix {
-		binary.LittleEndian.PutUint32(digest[i*4:], val)
-	}
-	return digest, crypto.Keccak256(append(seed, digest...))
-}
-
-// hashimotoLight aggregates data from the full dataset (using only a small
-// in-memory cache) in order to produce our final value for a particular header
-// hash and nonce.
-func hashimotoLight(size uint64, cache []uint32, hash []byte, nonce uint64) ([]byte, []byte) {
-	keccak512 := makeHasher(sha3.NewKeccak512())
-
-	lookup := func(index uint32) []uint32 {
-		rawData := generateDatasetItem(cache, index, keccak512)
-
-		data := make([]uint32, len(rawData)/4)
-		for i := 0; i < len(data); i++ {
-			data[i] = binary.LittleEndian.Uint32(rawData[i*4:])
-		}
-		return data
-	}
-	return hashimoto(hash, nonce, size, lookup)
-}
-
-// hashimotoFull aggregates data from the full dataset (using the full in-memory
-// dataset) in order to produce our final value for a particular header hash and
-// nonce.
-func hashimotoFull(dataset []uint32, hash []byte, nonce uint64) ([]byte, []byte) {
-	lookup := func(index uint32) []uint32 {
-		offset := index * hashWords
-		return dataset[offset : offset+hashWords]
-	}
-	return hashimoto(hash, nonce, uint64(len(dataset))*4, lookup)
-}
-
-// datasetSizes is a lookup table for the ethash dataset size for the first 2048
-// epochs (i.e. 61440000 blocks).
-var datasetSizes = []uint64{
-	1073739904, 1082130304, 1090514816, 1098906752, 1107293056,
-	1115684224, 1124070016, 1132461952, 1140849536, 1149232768,
-	1157627776, 1166013824, 1174404736, 1182786944, 1191180416,
-	1199568512, 1207958912, 1216345216, 1224732032, 1233124736,
-	1241513344, 1249902464, 1258290304, 1266673792, 1275067264,
-	1283453312, 1291844992, 1300234112, 1308619904, 1317010048,
-	1325397376, 1333787776, 1342176128, 1350561664, 1358954368,
-	1367339392, 1375731584, 1384118144, 1392507008, 1400897408,
-	1409284736, 1417673344, 1426062464, 1434451072, 1442839168,
-	1451229056, 1459615616, 1468006016, 1476394112, 1484782976,
-	1493171584, 1501559168, 1509948032, 1518337664, 1526726528,
-	1535114624, 1543503488, 1551892096, 1560278656, 1568669056,
-	1577056384, 1585446272, 1593831296, 1602219392, 1610610304,
-	1619000192, 1627386752, 1635773824, 1644164224, 1652555648,
-	1660943488, 1669332608, 1677721216, 1686109312, 1694497664,
-	1702886272, 1711274624, 1719661184, 1728047744, 1736434816,
-	1744829056, 1753218944, 1761606272, 1769995904, 1778382464,
-	1786772864, 1795157888, 1803550592, 1811937664, 1820327552,
-	1828711552, 1837102976, 1845488768, 1853879936, 1862269312,
-	1870656896, 1879048064, 1887431552, 1895825024, 1904212096,
-	1912601216, 1920988544, 1929379456, 1937765504, 1946156672,
-	1954543232, 1962932096, 1971321728, 1979707264, 1988093056,
-	1996487552, 2004874624, 2013262208, 2021653888, 2030039936,
-	2038430848, 2046819968, 2055208576, 2063596672, 2071981952,
-	2080373632, 2088762752, 2097149056, 2105539712, 2113928576,
-	2122315136, 2130700672, 2139092608, 2147483264, 2155872128,
-	2164257664, 2172642176, 2181035392, 2189426048, 2197814912,
-	2206203008, 2214587264, 2222979712, 2231367808, 2239758208,
-	2248145024, 2256527744, 2264922752, 2273312128, 2281701248,
-	2290086272, 2298476672, 2306867072, 2315251072, 2323639168,
-	2332032128, 2340420224, 2348808064, 2357196416, 2365580416,
-	2373966976, 2382363008, 2390748544, 2399139968, 2407530368,
-	2415918976, 2424307328, 2432695424, 2441084288, 2449472384,
-	2457861248, 2466247808, 2474637184, 2483026816, 2491414144,
-	2499803776, 2508191872, 2516582272, 2524970368, 2533359232,
-	2541743488, 2550134144, 2558525056, 2566913408, 2575301504,
-	2583686528, 2592073856, 2600467328, 2608856192, 2617240448,
-	2625631616, 2634022016, 2642407552, 2650796416, 2659188352,
-	2667574912, 2675965312, 2684352896, 2692738688, 2701130624,
-	2709518464, 2717907328, 2726293376, 2734685056, 2743073152,
-	2751462016, 2759851648, 2768232832, 2776625536, 2785017728,
-	2793401984, 2801794432, 2810182016, 2818571648, 2826959488,
-	2835349376, 2843734144, 2852121472, 2860514432, 2868900992,
-	2877286784, 2885676928, 2894069632, 2902451584, 2910843008,
-	2919234688, 2927622784, 2936011648, 2944400768, 2952789376,
-	2961177728, 2969565568, 2977951616, 2986338944, 2994731392,
-	3003120256, 3011508352, 3019895936, 3028287104, 3036675968,
-	3045063808, 3053452928, 3061837696, 3070228352, 3078615424,
-	3087003776, 3095394944, 3103782272, 3112173184, 3120562048,
-	3128944768, 3137339264, 3145725056, 3154109312, 3162505088,
-	3170893184, 3179280256, 3187669376, 3196056704, 3204445568,
-	3212836736, 3221224064, 3229612928, 3238002304, 3246391168,
-	3254778496, 3263165824, 3271556224, 3279944576, 3288332416,
-	3296719232, 3305110912, 3313500032, 3321887104, 3330273152,
-	3338658944, 3347053184, 3355440512, 3363827072, 3372220288,
-	3380608384, 3388997504, 3397384576, 3405774208, 3414163072,
-	3422551936, 3430937984, 3439328384, 3447714176, 3456104576,
-	3464493952, 3472883584, 3481268864, 3489655168, 3498048896,
-	3506434432, 3514826368, 3523213952, 3531603584, 3539987072,
-	3548380288, 3556763264, 3565157248, 3573545344, 3581934464,
-	3590324096, 3598712704, 3607098752, 3615488384, 3623877248,
-	3632265856, 3640646528, 3649043584, 3657430144, 3665821568,
-	3674207872, 3682597504, 3690984832, 3699367808, 3707764352,
-	3716152448, 3724541056, 3732925568, 3741318016, 3749706368,
-	3758091136, 3766481536, 3774872704, 3783260032, 3791650432,
-	3800036224, 3808427648, 3816815488, 3825204608, 3833592704,
-	3841981568, 3850370432, 3858755968, 3867147904, 3875536256,
-	3883920512, 3892313728, 3900702592, 3909087872, 3917478784,
-	3925868416, 3934256512, 3942645376, 3951032192, 3959422336,
-	3967809152, 3976200064, 3984588416, 3992974976, 4001363584,
-	4009751168, 4018141312, 4026530432, 4034911616, 4043308928,
-	4051695488, 4060084352, 4068472448, 4076862848, 4085249408,
-	4093640576, 4102028416, 4110413696, 4118805632, 4127194496,
-	4135583104, 4143971968, 4152360832, 4160746112, 4169135744,
-	4177525888, 4185912704, 4194303616, 4202691968, 4211076736,
-	4219463552, 4227855488, 4236246656, 4244633728, 4253022848,
-	4261412224, 4269799808, 4278184832, 4286578048, 4294962304,
-	4303349632, 4311743104, 4320130432, 4328521088, 4336909184,
-	4345295488, 4353687424, 4362073472, 4370458496, 4378852736,
-	4387238528, 4395630208, 4404019072, 4412407424, 4420790656,
-	4429182848, 4437571456, 4445962112, 4454344064, 4462738048,
-	4471119232, 4479516544, 4487904128, 4496289664, 4504682368,
-	4513068416, 4521459584, 4529846144, 4538232704, 4546619776,
-	4555010176, 4563402112, 4571790208, 4580174464, 4588567936,
-	4596957056, 4605344896, 4613734016, 4622119808, 4630511488,
-	4638898816, 4647287936, 4655675264, 4664065664, 4672451968,
-	4680842624, 4689231488, 4697620352, 4706007424, 4714397056,
-	4722786176, 4731173248, 4739562368, 4747951744, 4756340608,
-	4764727936, 4773114496, 4781504384, 4789894784, 4798283648,
-	4806667648, 4815059584, 4823449472, 4831835776, 4840226176,
-	4848612224, 4857003392, 4865391488, 4873780096, 4882169728,
-	4890557312, 4898946944, 4907333248, 4915722368, 4924110976,
-	4932499328, 4940889728, 4949276032, 4957666432, 4966054784,
-	4974438016, 4982831488, 4991221376, 4999607168, 5007998848,
-	5016386432, 5024763776, 5033164672, 5041544576, 5049941888,
-	5058329728, 5066717056, 5075107456, 5083494272, 5091883904,
-	5100273536, 5108662144, 5117048192, 5125436032, 5133827456,
-	5142215296, 5150605184, 5158993024, 5167382144, 5175769472,
-	5184157568, 5192543872, 5200936064, 5209324928, 5217711232,
-	5226102656, 5234490496, 5242877312, 5251263872, 5259654016,
-	5268040832, 5276434304, 5284819328, 5293209728, 5301598592,
-	5309986688, 5318374784, 5326764416, 5335151488, 5343542144,
-	5351929472, 5360319872, 5368706944, 5377096576, 5385484928,
-	5393871232, 5402263424, 5410650496, 5419040384, 5427426944,
-	5435816576, 5444205952, 5452594816, 5460981376, 5469367936,
-	5477760896, 5486148736, 5494536832, 5502925952, 5511315328,
-	5519703424, 5528089984, 5536481152, 5544869504, 5553256064,
-	5561645696, 5570032768, 5578423936, 5586811264, 5595193216,
-	5603585408, 5611972736, 5620366208, 5628750464, 5637143936,
-	5645528192, 5653921408, 5662310272, 5670694784, 5679082624,
-	5687474048, 5695864448, 5704251008, 5712641408, 5721030272,
-	5729416832, 5737806208, 5746194304, 5754583936, 5762969984,
-	5771358592, 5779748224, 5788137856, 5796527488, 5804911232,
-	5813300608, 5821692544, 5830082176, 5838468992, 5846855552,
-	5855247488, 5863636096, 5872024448, 5880411008, 5888799872,
-	5897186432, 5905576832, 5913966976, 5922352768, 5930744704,
-	5939132288, 5947522432, 5955911296, 5964299392, 5972688256,
-	5981074304, 5989465472, 5997851008, 6006241408, 6014627968,
-	6023015552, 6031408256, 6039796096, 6048185216, 6056574848,
-	6064963456, 6073351808, 6081736064, 6090128768, 6098517632,
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-	16844323712, 16852711552, 16861101952, 16869489536, 16877876864,
-	16886265728, 16894653056, 16903044736, 16911431296, 16919821696,
-	16928207488, 16936592768, 16944987776, 16953375616, 16961763968,
-	16970152832, 16978540928, 16986929536, 16995319168, 17003704448,
-	17012096896, 17020481152, 17028870784, 17037262208, 17045649536,
-	17054039936, 17062426496, 17070814336, 17079205504, 17087592064,
-	17095978112, 17104369024, 17112759424, 17121147776, 17129536384,
-	17137926016, 17146314368, 17154700928, 17163089792, 17171480192,
-	17179864192, 17188256896, 17196644992, 17205033856, 17213423488,
-	17221811072, 17230198912, 17238588032, 17246976896, 17255360384,
-	17263754624, 17272143232, 17280530048, 17288918912, 17297309312,
-	17305696384, 17314085504, 17322475136, 17330863744, 17339252096,
-	17347640192, 17356026496, 17364413824, 17372796544, 17381190016,
-	17389583488, 17397972608, 17406360704, 17414748544, 17423135872,
-	17431527296, 17439915904, 17448303232, 17456691584, 17465081728,
-	17473468288, 17481857408, 17490247552, 17498635904, 17507022464,
-	17515409024, 17523801728, 17532189824, 17540577664, 17548966016,
-	17557353344, 17565741184, 17574131584, 17582519168, 17590907008,
-	17599296128, 17607687808, 17616076672, 17624455808, 17632852352,
-	17641238656, 17649630848, 17658018944, 17666403968, 17674794112,
-	17683178368, 17691573376, 17699962496, 17708350592, 17716739968,
-	17725126528, 17733517184, 17741898112, 17750293888, 17758673024,
-	17767070336, 17775458432, 17783848832, 17792236928, 17800625536,
-	17809012352, 17817402752, 17825785984, 17834178944, 17842563968,
-	17850955648, 17859344512, 17867732864, 17876119424, 17884511872,
-	17892900224, 17901287296, 17909677696, 17918058112, 17926451072,
-	17934843776, 17943230848, 17951609216, 17960008576, 17968397696,
-	17976784256, 17985175424, 17993564032, 18001952128, 18010339712,
-	18018728576, 18027116672, 18035503232, 18043894144, 18052283264,
-	18060672128, 18069056384, 18077449856, 18085837184, 18094225792,
-	18102613376, 18111004544, 18119388544, 18127781248, 18136170368,
-	18144558976, 18152947328, 18161336192, 18169724288, 18178108544,
-	18186498944, 18194886784, 18203275648, 18211666048, 18220048768,
-	18228444544, 18236833408, 18245220736}
-
-// cacheSizes is a lookup table for the ethash verification cache size for the
-// first 2048 epochs (i.e. 61440000 blocks).
-var cacheSizes = []uint64{
-	16776896, 16907456, 17039296, 17170112, 17301056, 17432512, 17563072,
-	17693888, 17824192, 17955904, 18087488, 18218176, 18349504, 18481088,
-	18611392, 18742336, 18874304, 19004224, 19135936, 19267264, 19398208,
-	19529408, 19660096, 19791424, 19922752, 20053952, 20184896, 20315968,
-	20446912, 20576576, 20709184, 20840384, 20971072, 21102272, 21233216,
-	21364544, 21494848, 21626816, 21757376, 21887552, 22019392, 22151104,
-	22281536, 22412224, 22543936, 22675264, 22806464, 22935872, 23068096,
-	23198272, 23330752, 23459008, 23592512, 23723968, 23854912, 23986112,
-	24116672, 24247616, 24378688, 24509504, 24640832, 24772544, 24903488,
-	25034432, 25165376, 25296704, 25427392, 25558592, 25690048, 25820096,
-	25951936, 26081728, 26214208, 26345024, 26476096, 26606656, 26737472,
-	26869184, 26998208, 27131584, 27262528, 27393728, 27523904, 27655744,
-	27786688, 27917888, 28049344, 28179904, 28311488, 28441792, 28573504,
-	28700864, 28835648, 28966208, 29096768, 29228608, 29359808, 29490752,
-	29621824, 29752256, 29882816, 30014912, 30144448, 30273728, 30406976,
-	30538432, 30670784, 30799936, 30932672, 31063744, 31195072, 31325248,
-	31456192, 31588288, 31719232, 31850432, 31981504, 32110784, 32243392,
-	32372672, 32505664, 32636608, 32767808, 32897344, 33029824, 33160768,
-	33289664, 33423296, 33554368, 33683648, 33816512, 33947456, 34076992,
-	34208704, 34340032, 34471744, 34600256, 34734016, 34864576, 34993984,
-	35127104, 35258176, 35386688, 35518528, 35650624, 35782336, 35910976,
-	36044608, 36175808, 36305728, 36436672, 36568384, 36699968, 36830656,
-	36961984, 37093312, 37223488, 37355072, 37486528, 37617472, 37747904,
-	37879232, 38009792, 38141888, 38272448, 38403392, 38535104, 38660672,
-	38795584, 38925632, 39059264, 39190336, 39320768, 39452096, 39581632,
-	39713984, 39844928, 39974848, 40107968, 40238144, 40367168, 40500032,
-	40631744, 40762816, 40894144, 41023552, 41155904, 41286208, 41418304,
-	41547712, 41680448, 41811904, 41942848, 42073792, 42204992, 42334912,
-	42467008, 42597824, 42729152, 42860096, 42991552, 43122368, 43253696,
-	43382848, 43515712, 43646912, 43777088, 43907648, 44039104, 44170432,
-	44302144, 44433344, 44564288, 44694976, 44825152, 44956864, 45088448,
-	45219008, 45350464, 45481024, 45612608, 45744064, 45874496, 46006208,
-	46136768, 46267712, 46399424, 46529344, 46660672, 46791488, 46923328,
-	47053504, 47185856, 47316928, 47447872, 47579072, 47710144, 47839936,
-	47971648, 48103232, 48234176, 48365248, 48496192, 48627136, 48757312,
-	48889664, 49020736, 49149248, 49283008, 49413824, 49545152, 49675712,
-	49807168, 49938368, 50069056, 50200256, 50331584, 50462656, 50593472,
-	50724032, 50853952, 50986048, 51117632, 51248576, 51379904, 51510848,
-	51641792, 51773248, 51903296, 52035136, 52164032, 52297664, 52427968,
-	52557376, 52690112, 52821952, 52952896, 53081536, 53213504, 53344576,
-	53475776, 53608384, 53738816, 53870528, 54000832, 54131776, 54263744,
-	54394688, 54525248, 54655936, 54787904, 54918592, 55049152, 55181248,
-	55312064, 55442752, 55574336, 55705024, 55836224, 55967168, 56097856,
-	56228672, 56358592, 56490176, 56621888, 56753728, 56884928, 57015488,
-	57146816, 57278272, 57409216, 57540416, 57671104, 57802432, 57933632,
-	58064576, 58195264, 58326976, 58457408, 58588864, 58720192, 58849984,
-	58981696, 59113024, 59243456, 59375552, 59506624, 59637568, 59768512,
-	59897792, 60030016, 60161984, 60293056, 60423872, 60554432, 60683968,
-	60817216, 60948032, 61079488, 61209664, 61341376, 61471936, 61602752,
-	61733696, 61865792, 61996736, 62127808, 62259136, 62389568, 62520512,
-	62651584, 62781632, 62910784, 63045056, 63176128, 63307072, 63438656,
-	63569216, 63700928, 63831616, 63960896, 64093888, 64225088, 64355392,
-	64486976, 64617664, 64748608, 64879424, 65009216, 65142464, 65273792,
-	65402816, 65535424, 65666752, 65797696, 65927744, 66060224, 66191296,
-	66321344, 66453056, 66584384, 66715328, 66846656, 66977728, 67108672,
-	67239104, 67370432, 67501888, 67631296, 67763776, 67895104, 68026304,
-	68157248, 68287936, 68419264, 68548288, 68681408, 68811968, 68942912,
-	69074624, 69205568, 69337024, 69467584, 69599168, 69729472, 69861184,
-	69989824, 70122944, 70253888, 70385344, 70515904, 70647232, 70778816,
-	70907968, 71040832, 71171648, 71303104, 71432512, 71564992, 71695168,
-	71826368, 71958464, 72089536, 72219712, 72350144, 72482624, 72613568,
-	72744512, 72875584, 73006144, 73138112, 73268672, 73400128, 73530944,
-	73662272, 73793344, 73924544, 74055104, 74185792, 74316992, 74448832,
-	74579392, 74710976, 74841664, 74972864, 75102784, 75233344, 75364544,
-	75497024, 75627584, 75759296, 75890624, 76021696, 76152256, 76283072,
-	76414144, 76545856, 76676672, 76806976, 76937792, 77070016, 77200832,
-	77331392, 77462464, 77593664, 77725376, 77856448, 77987776, 78118336,
-	78249664, 78380992, 78511424, 78642496, 78773056, 78905152, 79033664,
-	79166656, 79297472, 79429568, 79560512, 79690816, 79822784, 79953472,
-	80084672, 80214208, 80346944, 80477632, 80608576, 80740288, 80870848,
-	81002048, 81133504, 81264448, 81395648, 81525952, 81657536, 81786304,
-	81919808, 82050112, 82181312, 82311616, 82443968, 82573376, 82705984,
-	82835776, 82967744, 83096768, 83230528, 83359552, 83491264, 83622464,
-	83753536, 83886016, 84015296, 84147776, 84277184, 84409792, 84540608,
-	84672064, 84803008, 84934336, 85065152, 85193792, 85326784, 85458496,
-	85589312, 85721024, 85851968, 85982656, 86112448, 86244416, 86370112,
-	86506688, 86637632, 86769344, 86900672, 87031744, 87162304, 87293632,
-	87424576, 87555392, 87687104, 87816896, 87947968, 88079168, 88211264,
-	88341824, 88473152, 88603712, 88735424, 88862912, 88996672, 89128384,
-	89259712, 89390272, 89521984, 89652544, 89783872, 89914816, 90045376,
-	90177088, 90307904, 90438848, 90569152, 90700096, 90832832, 90963776,
-	91093696, 91223744, 91356992, 91486784, 91618496, 91749824, 91880384,
-	92012224, 92143552, 92273344, 92405696, 92536768, 92666432, 92798912,
-	92926016, 93060544, 93192128, 93322816, 93453632, 93583936, 93715136,
-	93845056, 93977792, 94109504, 94240448, 94371776, 94501184, 94632896,
-	94764224, 94895552, 95023424, 95158208, 95287744, 95420224, 95550016,
-	95681216, 95811904, 95943872, 96075328, 96203584, 96337856, 96468544,
-	96599744, 96731072, 96860992, 96992576, 97124288, 97254848, 97385536,
-	97517248, 97647808, 97779392, 97910464, 98041408, 98172608, 98303168,
-	98434496, 98565568, 98696768, 98827328, 98958784, 99089728, 99220928,
-	99352384, 99482816, 99614272, 99745472, 99876416, 100007104,
-	100138048, 100267072, 100401088, 100529984, 100662592, 100791872,
-	100925248, 101056064, 101187392, 101317952, 101449408, 101580608,
-	101711296, 101841728, 101973824, 102104896, 102235712, 102366016,
-	102498112, 102628672, 102760384, 102890432, 103021888, 103153472,
-	103284032, 103415744, 103545152, 103677248, 103808576, 103939648,
-	104070976, 104201792, 104332736, 104462528, 104594752, 104725952,
-	104854592, 104988608, 105118912, 105247808, 105381184, 105511232,
-	105643072, 105774784, 105903296, 106037056, 106167872, 106298944,
-	106429504, 106561472, 106691392, 106822592, 106954304, 107085376,
-	107216576, 107346368, 107478464, 107609792, 107739712, 107872192,
-	108003136, 108131392, 108265408, 108396224, 108527168, 108657344,
-	108789568, 108920384, 109049792, 109182272, 109312576, 109444928,
-	109572928, 109706944, 109837888, 109969088, 110099648, 110230976,
-	110362432, 110492992, 110624704, 110755264, 110886208, 111017408,
-	111148864, 111279296, 111410752, 111541952, 111673024, 111803456,
-	111933632, 112066496, 112196416, 112328512, 112457792, 112590784,
-	112715968, 112852672, 112983616, 113114944, 113244224, 113376448,
-	113505472, 113639104, 113770304, 113901376, 114031552, 114163264,
-	114294592, 114425536, 114556864, 114687424, 114818624, 114948544,
-	115080512, 115212224, 115343296, 115473472, 115605184, 115736128,
-	115867072, 115997248, 116128576, 116260288, 116391488, 116522944,
-	116652992, 116784704, 116915648, 117046208, 117178304, 117308608,
-	117440192, 117569728, 117701824, 117833024, 117964096, 118094656,
-	118225984, 118357312, 118489024, 118617536, 118749632, 118882112,
-	119012416, 119144384, 119275328, 119406016, 119537344, 119668672,
-	119798464, 119928896, 120061376, 120192832, 120321728, 120454336,
-	120584512, 120716608, 120848192, 120979136, 121109056, 121241408,
-	121372352, 121502912, 121634752, 121764416, 121895744, 122027072,
-	122157632, 122289088, 122421184, 122550592, 122682944, 122813888,
-	122945344, 123075776, 123207488, 123338048, 123468736, 123600704,
-	123731264, 123861952, 123993664, 124124608, 124256192, 124386368,
-	124518208, 124649024, 124778048, 124911296, 125041088, 125173696,
-	125303744, 125432896, 125566912, 125696576, 125829056, 125958592,
-	126090304, 126221248, 126352832, 126483776, 126615232, 126746432,
-	126876608, 127008704, 127139392, 127270336, 127401152, 127532224,
-	127663552, 127794752, 127925696, 128055232, 128188096, 128319424,
-	128449856, 128581312, 128712256, 128843584, 128973632, 129103808,
-	129236288, 129365696, 129498944, 129629888, 129760832, 129892288,
-	130023104, 130154048, 130283968, 130416448, 130547008, 130678336,
-	130807616, 130939456, 131071552, 131202112, 131331776, 131464384,
-	131594048, 131727296, 131858368, 131987392, 132120256, 132250816,
-	132382528, 132513728, 132644672, 132774976, 132905792, 133038016,
-	133168832, 133299392, 133429312, 133562048, 133692992, 133823296,
-	133954624, 134086336, 134217152, 134348608, 134479808, 134607296,
-	134741056, 134872384, 135002944, 135134144, 135265472, 135396544,
-	135527872, 135659072, 135787712, 135921472, 136052416, 136182848,
-	136313792, 136444864, 136576448, 136707904, 136837952, 136970048,
-	137099584, 137232064, 137363392, 137494208, 137625536, 137755712,
-	137887424, 138018368, 138149824, 138280256, 138411584, 138539584,
-	138672832, 138804928, 138936128, 139066688, 139196864, 139328704,
-	139460032, 139590208, 139721024, 139852864, 139984576, 140115776,
-	140245696, 140376512, 140508352, 140640064, 140769856, 140902336,
-	141032768, 141162688, 141294016, 141426496, 141556544, 141687488,
-	141819584, 141949888, 142080448, 142212544, 142342336, 142474432,
-	142606144, 142736192, 142868288, 142997824, 143129408, 143258944,
-	143392448, 143523136, 143653696, 143785024, 143916992, 144045632,
-	144177856, 144309184, 144440768, 144570688, 144701888, 144832448,
-	144965056, 145096384, 145227584, 145358656, 145489856, 145620928,
-	145751488, 145883072, 146011456, 146144704, 146275264, 146407232,
-	146538176, 146668736, 146800448, 146931392, 147062336, 147193664,
-	147324224, 147455936, 147586624, 147717056, 147848768, 147979456,
-	148110784, 148242368, 148373312, 148503232, 148635584, 148766144,
-	148897088, 149028416, 149159488, 149290688, 149420224, 149551552,
-	149683136, 149814976, 149943616, 150076352, 150208064, 150338624,
-	150470464, 150600256, 150732224, 150862784, 150993088, 151125952,
-	151254976, 151388096, 151519168, 151649728, 151778752, 151911104,
-	152042944, 152174144, 152304704, 152435648, 152567488, 152698816,
-	152828992, 152960576, 153091648, 153222976, 153353792, 153484096,
-	153616192, 153747008, 153878336, 154008256, 154139968, 154270912,
-	154402624, 154533824, 154663616, 154795712, 154926272, 155057984,
-	155188928, 155319872, 155450816, 155580608, 155712064, 155843392,
-	155971136, 156106688, 156237376, 156367424, 156499264, 156630976,
-	156761536, 156892352, 157024064, 157155008, 157284416, 157415872,
-	157545536, 157677248, 157810496, 157938112, 158071744, 158203328,
-	158334656, 158464832, 158596288, 158727616, 158858048, 158988992,
-	159121216, 159252416, 159381568, 159513152, 159645632, 159776192,
-	159906496, 160038464, 160169536, 160300352, 160430656, 160563008,
-	160693952, 160822208, 160956352, 161086784, 161217344, 161349184,
-	161480512, 161611456, 161742272, 161873216, 162002752, 162135872,
-	162266432, 162397888, 162529216, 162660032, 162790976, 162922048,
-	163052096, 163184576, 163314752, 163446592, 163577408, 163707968,
-	163839296, 163969984, 164100928, 164233024, 164364224, 164494912,
-	164625856, 164756672, 164887616, 165019072, 165150016, 165280064,
-	165412672, 165543104, 165674944, 165805888, 165936832, 166067648,
-	166198336, 166330048, 166461248, 166591552, 166722496, 166854208,
-	166985408, 167116736, 167246656, 167378368, 167508416, 167641024,
-	167771584, 167903168, 168034112, 168164032, 168295744, 168427456,
-	168557632, 168688448, 168819136, 168951616, 169082176, 169213504,
-	169344832, 169475648, 169605952, 169738048, 169866304, 169999552,
-	170131264, 170262464, 170393536, 170524352, 170655424, 170782016,
-	170917696, 171048896, 171179072, 171310784, 171439936, 171573184,
-	171702976, 171835072, 171966272, 172097216, 172228288, 172359232,
-	172489664, 172621376, 172747712, 172883264, 173014208, 173144512,
-	173275072, 173407424, 173539136, 173669696, 173800768, 173931712,
-	174063424, 174193472, 174325696, 174455744, 174586816, 174718912,
-	174849728, 174977728, 175109696, 175242688, 175374272, 175504832,
-	175636288, 175765696, 175898432, 176028992, 176159936, 176291264,
-	176422592, 176552512, 176684864, 176815424, 176946496, 177076544,
-	177209152, 177340096, 177470528, 177600704, 177731648, 177864256,
-	177994816, 178126528, 178257472, 178387648, 178518464, 178650176,
-	178781888, 178912064, 179044288, 179174848, 179305024, 179436736,
-	179568448, 179698496, 179830208, 179960512, 180092608, 180223808,
-	180354752, 180485696, 180617152, 180748096, 180877504, 181009984,
-	181139264, 181272512, 181402688, 181532608, 181663168, 181795136,
-	181926592, 182057536, 182190016, 182320192, 182451904, 182582336,
-	182713792, 182843072, 182976064, 183107264, 183237056, 183368384,
-	183494848, 183631424, 183762752, 183893824, 184024768, 184154816,
-	184286656, 184417984, 184548928, 184680128, 184810816, 184941248,
-	185072704, 185203904, 185335616, 185465408, 185596352, 185727296,
-	185859904, 185989696, 186121664, 186252992, 186383552, 186514112,
-	186645952, 186777152, 186907328, 187037504, 187170112, 187301824,
-	187429184, 187562048, 187693504, 187825472, 187957184, 188087104,
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-	273937088, 274071488, 274200896, 274332992, 274463296, 274595392,
-	274726208, 274857536, 274988992, 275118656, 275250496, 275382208,
-	275513024, 275643968, 275775296, 275906368, 276037184, 276167872,
-	276297664, 276429376, 276560576, 276692672, 276822976, 276955072,
-	277085632, 277216832, 277347008, 277478848, 277609664, 277740992,
-	277868608, 278002624, 278134336, 278265536, 278395328, 278526784,
-	278657728, 278789824, 278921152, 279052096, 279182912, 279313088,
-	279443776, 279576256, 279706048, 279838528, 279969728, 280099648,
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-	282590272, 282720832, 282853184, 282983744, 283115072, 283246144,
-	283377344, 283508416, 283639744, 283770304, 283901504, 284032576,
-	284163136, 284294848, 284426176, 284556992, 284687296, 284819264,
-	284950208, 285081536}
diff --git a/pow/ethash_algo_go1.7.go b/pow/ethash_algo_go1.7.go
deleted file mode 100644
index ce05b3bb0..000000000
--- a/pow/ethash_algo_go1.7.go
+++ /dev/null
@@ -1,47 +0,0 @@
-// Copyright 2017 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-// +build !go1.8
-
-package pow
-
-// cacheSize calculates and returns the size of the ethash verification cache that
-// belongs to a certain block number. The cache size grows linearly, however, we
-// always take the highest prime below the linearly growing threshold in order to
-// reduce the risk of accidental regularities leading to cyclic behavior.
-func cacheSize(block uint64) uint64 {
-	// If we have a pre-generated value, use that
-	epoch := int(block / epochLength)
-	if epoch < len(cacheSizes) {
-		return cacheSizes[epoch]
-	}
-	// We don't have a way to verify primes fast before Go 1.8
-	panic("fast prime testing unsupported in Go < 1.8")
-}
-
-// datasetSize calculates and returns the size of the ethash mining dataset that
-// belongs to a certain block number. The dataset size grows linearly, however, we
-// always take the highest prime below the linearly growing threshold in order to
-// reduce the risk of accidental regularities leading to cyclic behavior.
-func datasetSize(block uint64) uint64 {
-	// If we have a pre-generated value, use that
-	epoch := int(block / epochLength)
-	if epoch < len(datasetSizes) {
-		return datasetSizes[epoch]
-	}
-	// We don't have a way to verify primes fast before Go 1.8
-	panic("fast prime testing unsupported in Go < 1.8")
-}
diff --git a/pow/ethash_algo_go1.8.go b/pow/ethash_algo_go1.8.go
deleted file mode 100644
index cac96cd5e..000000000
--- a/pow/ethash_algo_go1.8.go
+++ /dev/null
@@ -1,57 +0,0 @@
-// Copyright 2017 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-// +build go1.8
-
-package pow
-
-import "math/big"
-
-// cacheSize calculates and returns the size of the ethash verification cache that
-// belongs to a certain block number. The cache size grows linearly, however, we
-// always take the highest prime below the linearly growing threshold in order to
-// reduce the risk of accidental regularities leading to cyclic behavior.
-func cacheSize(block uint64) uint64 {
-	// If we have a pre-generated value, use that
-	epoch := int(block / epochLength)
-	if epoch < len(cacheSizes) {
-		return cacheSizes[epoch]
-	}
-	// No known cache size, calculate manually (sanity branch only)
-	size := uint64(cacheInitBytes + cacheGrowthBytes*uint64(epoch) - hashBytes)
-	for !new(big.Int).SetUint64(size / hashBytes).ProbablyPrime(1) { // Always accurate for n < 2^64
-		size -= 2 * hashBytes
-	}
-	return size
-}
-
-// datasetSize calculates and returns the size of the ethash mining dataset that
-// belongs to a certain block number. The dataset size grows linearly, however, we
-// always take the highest prime below the linearly growing threshold in order to
-// reduce the risk of accidental regularities leading to cyclic behavior.
-func datasetSize(block uint64) uint64 {
-	// If we have a pre-generated value, use that
-	epoch := int(block / epochLength)
-	if epoch < len(datasetSizes) {
-		return datasetSizes[epoch]
-	}
-	// No known dataset size, calculate manually (sanity branch only)
-	size := uint64(datasetInitBytes + datasetGrowthBytes*uint64(epoch) - mixBytes)
-	for !new(big.Int).SetUint64(size / mixBytes).ProbablyPrime(1) { // Always accurate for n < 2^64
-		size -= 2 * mixBytes
-	}
-	return size
-}
diff --git a/pow/ethash_algo_go1.8_test.go b/pow/ethash_algo_go1.8_test.go
deleted file mode 100644
index 57e0b0b7a..000000000
--- a/pow/ethash_algo_go1.8_test.go
+++ /dev/null
@@ -1,46 +0,0 @@
-// Copyright 2017 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-// +build go1.8
-
-package pow
-
-import "testing"
-
-// Tests whether the dataset size calculator work correctly by cross checking the
-// hard coded lookup table with the value generated by it.
-func TestSizeCalculations(t *testing.T) {
-	var tests []uint64
-
-	// Verify all the cache sizes from the lookup table
-	defer func(sizes []uint64) { cacheSizes = sizes }(cacheSizes)
-	tests, cacheSizes = cacheSizes, []uint64{}
-
-	for i, test := range tests {
-		if size := cacheSize(uint64(i*epochLength) + 1); size != test {
-			t.Errorf("cache %d: cache size mismatch: have %d, want %d", i, size, test)
-		}
-	}
-	// Verify all the dataset sizes from the lookup table
-	defer func(sizes []uint64) { datasetSizes = sizes }(datasetSizes)
-	tests, datasetSizes = datasetSizes, []uint64{}
-
-	for i, test := range tests {
-		if size := datasetSize(uint64(i*epochLength) + 1); size != test {
-			t.Errorf("dataset %d: dataset size mismatch: have %d, want %d", i, size, test)
-		}
-	}
-}
diff --git a/pow/ethash_algo_test.go b/pow/ethash_algo_test.go
deleted file mode 100644
index 0605d70ad..000000000
--- a/pow/ethash_algo_test.go
+++ /dev/null
@@ -1,774 +0,0 @@
-// Copyright 2017 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package pow
-
-import (
-	"bytes"
-	"io/ioutil"
-	"math/big"
-	"os"
-	"reflect"
-	"sync"
-	"testing"
-
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/common/hexutil"
-	"github.com/ethereum/go-ethereum/core/types"
-)
-
-// Tests that verification caches can be correctly generated.
-func TestCacheGeneration(t *testing.T) {
-	tests := []struct {
-		size  uint64
-		epoch uint64
-		cache []byte
-	}{
-		{
-			size:  1024,
-			epoch: 0,
-			cache: hexutil.MustDecode("0x" +
-				"7ce2991c951f7bf4c4c1bb119887ee07871eb5339d7b97b8588e85c742de90e5bafd5bbe6ce93a134fb6be9ad3e30db99d9528a2ea7846833f52e9ca119b6b54" +
-				"8979480c46e19972bd0738779c932c1b43e665a2fd3122fc3ddb2691f353ceb0ed3e38b8f51fd55b6940290743563c9f8fa8822e611924657501a12aafab8a8d" +
-				"88fb5fbae3a99d14792406672e783a06940a42799b1c38bc28715db6d37cb11f9f6b24e386dc52dd8c286bd8c36fa813dffe4448a9f56ebcbeea866b42f68d22" +
-				"6c32aae4d695a23cab28fd74af53b0c2efcc180ceaaccc0b2e280103d097a03c1d1b0f0f26ce5f32a90238f9bc49f645db001ef9cd3d13d44743f841fad11a37" +
-				"fa290c62c16042f703578921f30b9951465aae2af4a5dad43a7341d7b4a62750954965a47a1c3af638dc3495c4d62a9bab843168c9fc0114e79cffd1b2827b01" +
-				"75d30ba054658f214e946cf24c43b40d3383fbb0493408e5c5392434ca21bbcf43200dfb876c713d201813934fa485f48767c5915745cf0986b1dc0f33e57748" +
-				"bf483ee2aff4248dfe461ec0504a13628401020fc22638584a8f2f5206a13b2f233898c78359b21c8226024d0a7a93df5eb6c282bdbf005a4aab497e096f2847" +
-				"76c71cee57932a8fb89f6d6b8743b60a4ea374899a94a2e0f218d5c55818cefb1790c8529a76dba31ebb0f4592d709b49587d2317970d39c086f18dd244291d9" +
-				"eedb16705e53e3350591bd4ff4566a3595ac0f0ce24b5e112a3d033bc51b6fea0a92296dea7f5e20bf6ee6bc347d868fda193c395b9bb147e55e5a9f67cfe741" +
-				"7eea7d699b155bd13804204df7ea91fa9249e4474dddf35188f77019c67d201e4c10d7079c5ad492a71afff9a23ca7e900ba7d1bdeaf3270514d8eb35eab8a0a" +
-				"718bb7273aeb37768fa589ed8ab01fbf4027f4ebdbbae128d21e485f061c20183a9bc2e31edbda0727442e9d58eb0fe198440fe199e02e77c0f7b99973f1f74c" +
-				"c9089a51ab96c94a84d66e6aa48b2d0a4543adb5a789039a2aa7b335ca85c91026c7d3c894da53ae364188c3fd92f78e01d080399884a47385aa792e38150cda" +
-				"a8620b2ebeca41fbc773bb837b5e724d6eb2de570d99858df0d7d97067fb8103b21757873b735097b35d3bea8fd1c359a9e8a63c1540c76c9784cf8d975e995c" +
-				"778401b94a2e66e6993ad67ad3ecdc2acb17779f1ea8606827ec92b11c728f8c3b6d3f04a3e6ed05ff81dd76d5dc5695a50377bc135aaf1671cf68b750315493" +
-				"6c64510164d53312bf3c41740c7a237b05faf4a191bd8a95dafa068dbcf370255c725900ce5c934f36feadcfe55b687c440574c1f06f39d207a8553d39156a24" +
-				"845f64fd8324bb85312979dead74f764c9677aab89801ad4f927f1c00f12e28f22422bb44200d1969d9ab377dd6b099dc6dbc3222e9321b2c1e84f8e2f07731c"),
-		},
-		{
-			size:  1024,
-			epoch: 1,
-			cache: hexutil.MustDecode("0x" +
-				"1f56855d59cc5a085720899b4377a0198f1abe948d85fe5820dc0e346b7c0931b9cde8e541d751de3b2b3275d0aabfae316209d5879297d8bd99f8a033c9d4df" +
-				"35add1029f4e6404a022d504fb8023e42989aba985a65933b0109c7218854356f9284983c9e7de97de591828ae348b63d1fc78d8db58157344d4e06530ffd422" +
-				"5c7f6080d451ff94961ec2dd9e28e6d81b49102451676dbdcb6ef1094c1e8b29e7e808d47b2ba5aeb52dabf00d5f0ee08c116289cbf56d8132e5ca557c3d6220" +
-				"5ba3a48539acabfd4ca3c89e3aaa668e24ffeaeb9eb0136a9fc5a8a676b6d5ad76175eeda0a1fa44b5ff5591079e4b7f581569b6c82416adcb82d7e92980df67" +
-				"2248c4024013e7be52cf91a82491627d9e6d80eda2770ab82badc5e120cd33a4c84495f718b57396a8f397e797087fad81fa50f0e2f5da71e40816a85de35a96" +
-				"3cd351364905c45b3116ff25851d43a2ca1d2aa5cdb408440dabef8c57778fc18608bf431d0c7ffd37649a21a7bb9d90def39c821669dbaf165c0262434dfb08" +
-				"5d057a12de4a7a59fd2dfc931c29c20371abf748b69b618a9bd485b3fb3166cad4d3d27edf0197aabeceb28b96670bdf020f26d1bb9b564aaf82d866bdffd6d4" +
-				"1aea89e20b15a5d1264ab01d1556bfc2a266081609d60928216bd9646038f07de9fedcc9f2b86ab1b07d7bd88ba1df08b3d89b2ac789001b48a723f217debcb7" +
-				"090303a3ef50c1d5d99a75c640ec2b401ab149e06511753d8c49cafdde2929ae61e09cc0f0319d262869d21ead9e0cf5ff2de3dbedfb994f32432d2e4aa44c82" +
-				"7c42781d1477fe03ea0772998e776d63363c6c3edd2d52c89b4d2c9d89cdd90fa33b2b41c8e3f78ef06fe90bcf5cc5756d33a032f16b744141aaa8852bb4cb3a" +
-				"40792b93489c6d6e56c235ec4aa36c263e9b766a4daaff34b2ea709f9f811aef498a65bfbc1deffd36fcc4d1a123345fac7bf57a1fb50394843cd28976a6c7ff" +
-				"fe70f7b8d8f384aa06e2c9964c92a8788cef397fffdd35181b42a35d5d98cd7244bbd09e802888d7efc0311ae58e0961e3656205df4bdc553f317df4b6ede4ca" +
-				"846294a32aec830ab1aa5aac4e78b821c35c70fd752fec353e373bf9be656e775a0111bcbeffdfebd3bd5251d27b9f6971aa561a2bd27a99d61b2ce3965c3726" +
-				"1e114353e6a31b09340f4078b8a8c6ce6ff4213067a8f21020f78aff4f8b472b701ef730aacb8ce7806ea31b14abe8f8efdd6357ca299d339abc4e43ba324ad1" +
-				"efe6eb1a5a6e137daa6ec9f6be30931ca368a944cfcf2a0a29f9a9664188f0466e6f078c347f9fe26a9a89d2029462b19245f24ace47aecace6ef85a4e96b31b" +
-				"5f470eb0165c6375eb8f245d50a25d521d1e569e3b2dccce626752bb26eae624a24511e831a81fab6898a791579f462574ca4851e6588116493dbccc3072e0c5"),
-		},
-	}
-	for i, tt := range tests {
-		cache := make([]uint32, tt.size/4)
-		generateCache(cache, tt.epoch, seedHash(tt.epoch*epochLength+1))
-
-		want := make([]uint32, tt.size/4)
-		prepare(want, tt.cache)
-
-		if !reflect.DeepEqual(cache, want) {
-			t.Errorf("cache %d: content mismatch: have %x, want %x", i, cache, want)
-		}
-	}
-}
-
-func TestDatasetGeneration(t *testing.T) {
-	tests := []struct {
-		epoch       uint64
-		cacheSize   uint64
-		datasetSize uint64
-		dataset     []byte
-	}{
-		{
-			epoch:       0,
-			cacheSize:   1024,
-			datasetSize: 32 * 1024,
-			dataset: hexutil.MustDecode("0x" +
-				"4bc09fbd530a041dd2ec296110a29e8f130f179c59d223f51ecce3126e8b0c74326abc2f32ccd9d7f976bd0944e3ccf8479db39343cbbffa467046ca97e2da63" +
-				"da5f9d9688c7c33ab7b8aace570e422fa48b24659b72fc534669209d66389ca15b099c5604601e7581488e3bd6925cec0f12d465f8004d4fa84793f8e1e46a1b" +
-				"31b7298991c6142f4f0b6e6b296728ae5fa63ccb667b61fbb1b078003d18d97b906af157debed5e6c55d5a61cae90c85f9e97d565314a2f9fd9e0c08430547d0" +
-				"7cfcee3271f921b95c32a11596219abaa30abc62c2c72c6725078c436c677320594df6bcb92134c1b114fffec982a1f68f13a9f812f074b9fb9c78f2cd4c1c90" +
-				"7ebf1e447f7a422b06303921e3d54f430584d849eaa4b7d652e92a5d659bdfc462adcdd7991e8c66a19da4ddb5390463d073941491859397f135ebbbdbdf5801" +
-				"cafb873c383893390141ae385515504d74a33608273310c312ba468046d2e20c271a38cc0e3920b39705050e752f34f244fc23ddd17ff18677756a87671d4145" +
-				"3aebf97e4890da1d645f41eb20da92a8537c787ce419580073c46aa3bb154952993142ec5b4fb6e8f108fd15fc618cd5c27b45a37ee6dcd52a4ce656c0f58604" +
-				"717ec55f5e592355f1f20e8316f8fd77243734a8b0f50ad93c1d95b5b0482afb22cd0667d935bd6053d7198b54974e10d100df7ca3ec2e0bb5ccce5807b266e0" +
-				"8429d5fec2ae6ae1cc7c5efc27f19c89d4b4a6c5c0b9397886dac635ba37446ff528b582457a4fe7f803f1a47903574f8982d4a679b627396a4e97aaa12fa179" +
-				"0d31ba52e9010bc3c26ace81f702f86649fe9eeda9ec03b74a8a5cf540d82e22af33ab893564397dfc4edd8b1677350df5b82ab61d24db95f58fd2d78afb49c7" +
-				"2d2b1fefa8ff6606b8623829cc752ea37d663b945f3f1d48ad07b1416af252f81b55acd8f164da4faa9d9453721b3b795041ce7df7c77edc13865dbe04fee331" +
-				"47daebe18c183c4a6594a6df3a4d2dc5e3811d805102c9c49286e3d12b38927fa49a7b0cdcb1d799f57118953e31c560aae213a1799d59a78ae68f0590347061" +
-				"fc2668caf08f860452f6b7d3ebc1efecc2e1227d33296b1f1850360dee7236e85274eaede4d18a58b4261ce1f6a7d283dcf64e6d021813f82a566354445327e5" +
-				"6217279b2393fe5aa0f9eb149d4866e1105106bcc221810ceaf053f2ec733d8a22f409c1baf955e50184005c5d55de907de97f5f713b62ae10937e1a7af6267b" +
-				"d2a239e8589017197c343b81540bc26bc52bffd5336fb1da1202a511c7175014d2f500b9d9ce78e4b9f2b158d0fb27af352b6f78c129cad642fe909612c9d658" +
-				"17a8d7f9195ee97201675a918e3cf520fdc19f92b7e6a3db806d4f3799361334082cc58a22ddb4e4f5760bd1667c177b26be325166c6bbed669a158fc87acd43" +
-				"a2462e12578d72db6606f9e24ae659ff411ac9b31d696b8354fd08a591622967a14f8468eaaae3907b7818154ba2d6e4581589354d178bb6ae1c03651c44bbf0" +
-				"e7fa52cb0da09508b5a444aed05a54f416841247a4fe36bd5529029e3adf78b105e22468ed775f4d0954504dd55f2c9b9e6b3a086370b2c0b6fec7efd6914e07" +
-				"26627edb7a04869a874e31f448271077a7de3031cf81bdbc39848efee6075e0d65fa3a32640e9f0395cf7ec12139992aff0a54e0a7dfe5048b3cc03246b56f7d" +
-				"3093538a7b87538d8792a665bc589373621b2f3cf47d2c1f8f580fe34d79c6b2a66323ce89808ce0e5cf77700f5a4446c4be01a310e8f7c7ebefe756b0044886" +
-				"a0477c88ee8ea8c71503748a4cf9eb40ad5c1c8accf7c63c0f43a94ed2b8a5999df3ab9b11b80de73310e036ca88668e640015fcf9cd18eed05517d54896f43e" +
-				"25e7931b44872c4e4183500e0e8c5103292bca1c0d6b0b00c9acce25d31204bb3e4f255c03a0a0916664e9c831b28b364078109a74411a11afb1e610c7d1c9d4" +
-				"ba5e10d0ee0da409654d9e7308395e17caeb9caebccb0192679866e6f2ecb5f10044333bb70d61712adb6d74cdec6918ed9a71d9925da576a1e6f4e906a5cd5f" +
-				"0e94a25e48a4141e4e2770144b63e2449b0f84c82879f34d78440cc430196ba85a213fdac1bcf279a46d7592fa29a876bb7a2efb7081365522a3f06fdceaedd3" +
-				"cc0335cef9ea570733fe8799bb1b918aa7732b4d175929d80c7844a78e19f2dc6a6febf648f49b40320b0f7d784e7f84e45408d70b046bd01cbd8fdaf606fcd3" +
-				"02f4e5a48ab8d13e93a246adfcc94f3109e02a7a969986e75b6ced6bf2d11a55ab77488e131b65a06398fa8e384dc90d875584c9b17cdcf2da5dd72a461cd07c" +
-				"4a955c5fe48509b3284476c42247e086de7d63839b7358cf4ebd9edf9ac8b6fd0c096166405de19c51e8785009d30feb67cdb8ff9ba55459dfdffba8c022e26c" +
-				"0ebd399e4b76ccb4d5491a862c2c4d8cdf1461a96c9b98150e170efacec980edc00a2c7f6d7c6bea3075627e1eb386a7f1ede1059da81a4ac5cf35aa173c88c5" +
-				"1818dc0fbc688b68b82ddc225b6c87588e0c680e303e737c82a13e34be58df8b0cb336aeacc698c79e7682ebb69e6cd6bdc5d11790c96afcfa9290f39515142f" +
-				"5f90b938216a1d14bc049ce3f0ac135722208b989d2557d3520c2186479f179e50fe5b125b8d6638a65047729c6249b9b2c6381c9103c97d1b389cc9cdb31c21" +
-				"8a2eecbf4b9ad1dcfa57446cde88f96563a544c49d6f5303a84a1b7cf074fca78e67e72c9ffa0c542fb646418c6434b16b771088140725cf2dc723c1a975c4ca" +
-				"8a80e633721274907353f51e95952c2b403b45750b42ad10961f60473eb54616f61f7b038c5b7eca475d6a2b844994a9eeddce4f7bb49782e50ef78bc13b85d1" +
-				"9e956f47c60823f3d1981413cb78d309f63a844694861b11b5238961c71f61d82daef6795734f0961e92b9167c57f48e91693e9656fcc6e88f9ce2d373da26bf" +
-				"45b3dff50211fec72387005a7e04828e4ae7ddd10fc2332acf5f1b0f67adcd863752573c2d24488857bfc58c41af45be7641f5cfff611f184612fc0d695866f4" +
-				"2b396b1d9881f442c4a995f4b500f02d4ab4b53ad6e01776ab0e244583f01301203a1515f3dbb73906014e36c7143bf882b005f0228ca0562623893c8a24b7c6" +
-				"4c2c561912010c121b5c3a1e35e75c0b094731e9c0d6acf5a2b1e5b179355525a175640579705f898feb98bffa25633bc126613fa27d2ceb214812902ada23f4" +
-				"367a78655d0d2276095c9e83dfa79153730103963499c367c5621fecfd0888253df82b3d5716703ef92594cf269310b9e6c892c488edb3bba1d0b216e92f622a" +
-				"7f8f7f00d2926d81a4c7ca6cef40d240576a8d5541ccf561c8e0e699925d20347ba7493ed6e182cfe3b633e70b3ce3a0d90813574f6fe329c495d3cd46fd5d7e" +
-				"bdde58d7eafcb134a9a5d3e5d66136e8c9b5d9ecac195dcc44158941c9fe2d87db52a7ddcedc9f82ec160901cc36a9c877af80ceae0563dfa75cabde5d7a7c94" +
-				"9f24bc190f7c2045368356474ff6eee284e7125d1c5f9a036fbde24cecfd3a30481ce077f20cbcb31924368296abf66ce4834102cf7cb949d1b4c6faa6d006ef" +
-				"21379cead5d5a39324d41555c46e0b42a1e871143e47f8e6b3d794e75d7a43c282732766d856e04e666ea346657b157404b0fc8534a2dee8243d40a5e37609e6" +
-				"18bc1d52b91a7623aaf8214a97e4c8c5d860b31c3792b129354a121a7a7e42b50dfbe3ab6590769401eb280545547a43c3a1455355d5d5fdedccb472abfe75b8" +
-				"f5e7d62b0b31553d8d55de0c3c71e6f5a2abba6fe81e9a42ec1968f235bc4296c1ac5df7430917453384450ab56dafa7c7af764cefa3b0bc861c52ae27692365" +
-				"9d7d9ed7609958884147acca867909a75bb6a2c364debefaf98c7ff70c7f4acb5cdb81100fd79a48c5139f8bbdc6553b509f1eb0f5d5d31886a602cd669b3f9f" +
-				"59195a1fa2bcff1170003ba1b2e5e9ad7f2bfcd0573d0f2be9d8fc1773c3a63a2b9292cdbf9b4515c0b1d51772e5ee95303ff493d85314c989e269df4ec3a916" +
-				"40988a11c6a4ad96f7d0541a150edf444c2b1672aa6d37564453b835c2d39864c05c4366492fc9164bf73795410e7aae8206430403357fec6389142b4976b218" +
-				"d70622b4098e322f73020a0d045f07668d1e512c6eeed6e2befbfc3a6ac64054396df96fd41f7aeefa0ab1f66bb52ee1a1df066f365fc43ff0800b0398b621f9" +
-				"a415895268505a81517c44a56dc94e76580fd107dba034bab9f4f4b8a9f881ff34c60c406c47b6d4a998894401006aa88f328393f9cd55a2b4d24db5abbcb05e" +
-				"20d392f3feab3ca12dac475eb3690f2bf9c699d7d90900d9a840068c8cdda2ca7a27bebd685a26eb01a768259a65ab4d7efc1811c87a5a1f4e5038f6b3dc74a6" +
-				"b46d9ac58d31bfc22dac23645aeef819329c9419326f22e1c24c53457baf62ae9b92ab5f999d4ef0ccfb5a21b7598340eb2d399ec81588b6a674c5a1e45aa238" +
-				"c55cae8e1af0f5d64ea378b8afeab263a3a2e5c71cdda4cdb824ae55df2b0260aadf386275ef57781d46f6da3d0b300ea68c14a620c25b5df738c54aef04d63b" +
-				"7dee06cd225e9ed00e78abcddca5a133d8b5e0d9b287e6436014c5da729442239bddb7ecd3fe34e6f6e530134a03ef45de4ae4fe3bf507f16cdfb9bab1fc90e8" +
-				"dc565e4a7ead95352c5a894661e5d82c6d0fc47843d5cab12c4013db76c90734cbff34c73d0d873ac9b27b417665f4948469865f33179624860604a9aba2ceb1" +
-				"68e74b6af3d1ad0bfcac4180ea844339a034b6b2c3e2f61f0c7afbaa76c1ebe93727df1d3db27d59a5cf51b2baaf637b6eb8a20302ef9af0b25dbe3a5e74331c" +
-				"6b0c8a0cf2a2ad72d2e19797983e09468ea95270dc229f2fa084dd2aa96e722016504f6d82508572d9c30711c3ef41ae3ae2f36cc6f5dddbcb0b40d9499b24c5" +
-				"4cd36d2927a6b9d57e335e4fca7f0f16887711a8c1ffa0b48bda46c506ca444b7c23e2c8dd086c2a87283d5fc0d58e9a384106837318dc84ffe65b52d4cb9141" +
-				"2672adfe139c3327350fe3cf355a08c0ca43598a253833e114243c5253077d65643323f5d69b3c7902d91bab7a0928754e7d80afab8d48539fcbe0d9ab83b4db" +
-				"43a6594c4071df2ef35acd1f53006a570f09104f1776b26a303e2aec93a00d2fd8c952d1ca0e54504cd9b469be7c1e71557ec31467ecc773ee817b17c4418712" +
-				"163ae86646b20b80c85860e828c48e88f1309c9ff018e6a95f4c1178de6a4f9f5860039511845da7d8727b5d824ba2502d0a3d76ce74372db77c2050c728dd65" +
-				"b3a15da4f1e1e41c3c2acfebc5618e5e923d503c43a3421d2628ac037c5ce13c74c4ee14d47af02323872f6bf2e8bf09d017ea6e8ec4d3f9fc4fb203ac4e1663" +
-				"756b11629224c676713a42b1f43dfd6362876be1c4865928688765589e26c8dd8bc04ca18d76ced7f786cdb0fa5028ae53991d5b7b45f93bbd50aeb97300f04e" +
-				"69c6736f270907f6a7ad76dde0a365183a961bc8385511e0f22ce0cb8f3c42c5d3928621841e30285fb625294865409267dbb0cf91730ba2fb1088fb79789a54" +
-				"a856311bdca5b0ac0e95fbc79b11c561dc03ea82db182808031e86ec327097143ee761bb62dae8a9f4101fabcac1fc87b3c2080820582dc8a7a8287364550013" +
-				"08053c781b3eb279c89e817fe97103b6930fef2dbf7728def389403a4283f63ec04ae953784b749f0ea6f08749781cd17fadfd15bb197afd2f4e0a8aade2b1ad" +
-				"5100cbdce49ed59658993c00e06bf57c0026b97beadc30cd25f586ff03ab40fcd731535c9a1ccb2c99dc7f8815feab767e1237cb069981f28d8fe26bdec24218" +
-				"488e6086c0ab0efc5d4211fa0726b3a11387df9bb62b863a7b154ca390a268f5e49f50dec45d24bece2a06575cc07a24bfff017d7445024739efb050ace5f345" +
-				"98dacda843d4ef5bfb2c931dc16ee3dd8b61a6f01d9a7de8bbb6d89ca8695f8ef8bd1cc6e0455848fac7691e6789218790270aef40fba114557fd88ff74fe8fc" +
-				"476d9b9665d7e45582540710ce92c8dcad1ad8c05642a23a0d58c02db37ae1a0e70fbc5f71b1300fe398c74cbad37fd57379f58dd3e2d3de6860a17acf3c9321" +
-				"02eb4f9d596497bd849c5bfaf59a83113ef389b6896aa4d4665504a22486299993a9987b2bbdb47d59b3f6ce5d2c9f9ba33b5f0760388ca7f8d8af07c1cd28f5" +
-				"67a417a59ebde4bb9867d4e7b7b79dd8665602c029e9a16a7718efde3d034f13f7f0b9af1702c335893526cb87afc2100e874b25c37fd666bf34bf6a653c7cf5" +
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-				"768aec456b93a05002666cb61b2229c99f2cdef9afc9cea1c4ee3a85dd189823399781ee33cde2abedff09c47960c035e075a29156005d75845a11fa06abcc50" +
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-				"40fe5adef97487641c6088dd8712c0c352708e474b02c08fd2d71b6d44f16d82f291ccd61c43a339408379a8de54cfdbbae5e421e084112fbc17fb5561e084d1" +
-				"4149bf4bb06fd161878d8574f856867cff974d5898e161923d55bdac8699c9df6a220bcb6c800d3ae7f107b8c4acab206d780aafaf6c2e2379de8c900700d9c9" +
-				"c87d464772514c5aa3e5f5bfc00fb54f2b74702838b4731c5ac8a070b50783e81dd97fa8d55c739d026b607a2a78aba1bb79b1a7a3c22c78368672ac020061e6" +
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-				"676e2043ac8540df9e3af4c0f51d816e89c09bf67253be45fc5f75f64be97f6c7dc0c6392af6fa8e75aab58eda976b36773cd37d315771400a2cb846fdef3d8a" +
-				"a15bce5dfda0379e526f87cf67767a2ab93d41c85b4ed016ed0a89d2f94737433a3ebade813def29eaa18a1fb925fca7d08d1020f64caebc562cb4ad2fb241e2" +
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-				"f070add34dc4565d1757d7e10a03e3bb73a607ed7e10861b1274ddee76183cf7e56c1de7162c805c2dba0e0331d36f3a4e2019a2e0705ee2747ed1e52bc3a6fb" +
-				"3b061f784348204cdf8d643ff6c271fa72b56900edcc2f77201f3bd4fc296ad6534a7029ea66761bb9a3589a1f6ef566504c70297b98fbb603214fed2e4b7ca1" +
-				"06e3f0e993118897fa641fb9722d4667fa98d07a6837e5ab2144e5ec1548a7dbca28c559f2a9a99d54b8e55f56d0e59bcef1ac45e2046835b60579da0d2261e7" +
-				"30dab9009d138421c6458d146e870358b0b3fa20257e50b58f167c6b47edf7053513d58f33547d06ce52458baaa4dcf15f77b103565c66a81f183c827801b455" +
-				"b61b6287a46a37a96884075a7eada9ba7f0ddcc14654bf87a26d2e27a978b415257773796923a220e06b25af16fb5aaded9b2d081a4c64106df460ddce9c3b2a" +
-				"c8553e1521e501ad29a4b7f7681c9b60576a127087a5237c4c2bacf9b163dd590e63f2bc80e7f1e613773f87d034313064710404739d63363d204be7b14800c4" +
-				"d8c1b6a2a21da70223be51d281fee302ef806454f9d7d28244ba537c1d9f8f1bcc5d47038d986a8f95ca48437ffe94fd44a90bb03014a259112a97508adb3db4" +
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-				"29920efe99479fe7e4b4e5371e13ccb43a1419cf023433239d840900d31bab37fabc3fd20e31bb7dbcb3ae8df66f67e2844944bcf544b658364f9e3d0b6d84b4" +
-				"63ad4eb621644fd7d774b501407a1178814b15149345d551b474347188067db2ab4d7f4d1abd3027133039e855e129f3f5649550da8c04fe2db57cb89bf1bf4f" +
-				"72eb35ccfe31afb92f6136d4c2a1c115b07b721b2da43151f11c356256230408979c5d95243714429e2c9500e7b043b20dac8a9763e5b487d1cbdb34ac379b9c" +
-				"6409454c79385b6e562459c4fdaad1b7f9297c1473e9b90fffe6d1c5390e241a187a4cefa2eb0cb0c11f4ca6c5b961c18ceb57892295290dbc991692556bffa3" +
-				"b8c405cf285e6bcb8a90246ad0ac15122f4cf73adc129d23aa2240733404beb6d74bf698e5589288a522573c774ce9f514b5d5c086382ea1dd4e89ff5facbf23" +
-				"d36bc3d203941e17747ede4b82820351f4df278ddb787ce8f6f1cc468ef953399efb072ce706e253f1bab76444bb70be6443cd0db633e958dc57bd223e00418e" +
-				"915a7c2e4d94c0623f9788276480cdfe798387d35e2ea2d304d066aec7627794cdd4200a44208d6c87f242c76e2d4a3f966b6fb96eaa63d892c1a177bef249b4" +
-				"fdd1a4c06c791f677dd9919f739ccf318bd77835330b0219786249c9c9736161dac771a838724f2dd70afba46a6782fd27601cf8a7126ae95a66e526131a68d7" +
-				"7a809e513533ed8021eecdbc5851dfcf95e10f1bbe47b5c7f079275a1837836245266b66d89fab25ac4bd6c1225560bea3259b67bf50a58ee056754d574da79e" +
-				"f9a1a0df3a5defed0f74fe74ce0bf65a04086f17e94a8451828c723c97932f26f9349f1a2c7866c617a528602721de4f3cc8916bcfc66cdc106bafa26ea87a13" +
-				"94dfa37e396365fb7f92df007b46a50ff04c7f85bfa679230ebedf18c2fb876fc7098dd1c4328adf85de71c31d94687a308053bfcdc158cfa7772170fbed63f5" +
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-				"5a3bc973b902280753e9c3226db9cc778e2506c56ee86ae85b4d54dbf05394107329b2d1ee56522cb1ce562fb1aa4e592199d9c29f64cc3ab1d757531e209eec" +
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-				"743e37474d7605cd01c44af600f16d9ffaf24acf87fbe5ccf39bac41047a810d210051c87f06147a0bb8f1427a406700483679638f1af23f1dafb7aa0c468669" +
-				"71c3a82f535c26cf6cb335e8e915fda393799d3dbe0e04b907ed3612d12ac95783a6876cd986d2a13b82192532e02c250eaa42f891d2481655fa4494c723fe00" +
-				"87d224444245eb5b0eade5f741b025db1992a8ad0dce51b0c1af4a18a9e244f9f755891adf0f19179c7baa6c32bffc91e0b03c4ed3aaee1978b6a1f03b87ac6a" +
-				"fc3b9e7030bb212b17de198edfccde29d04224798c1204e47ea235f048724fac62d637d1ba0ee3922048fcf79c746b6c0c036d882e3491fd72bad6e009c6403e" +
-				"55876f4d31330caa02aedd0b0c121c3c41e736853a08071f0dd4ddc7412db0bbe274a9ac2932552bb37c40e72c2ef1d7cca8236942e480d709d3ea9d5ae0a1b7",
-			),
-		},
-	}
-	for i, tt := range tests {
-		cache := make([]uint32, tt.cacheSize/4)
-		generateCache(cache, tt.epoch, seedHash(tt.epoch*epochLength+1))
-
-		dataset := make([]uint32, tt.datasetSize/4)
-		generateDataset(dataset, tt.epoch, cache)
-
-		want := make([]uint32, tt.datasetSize/4)
-		prepare(want, tt.dataset)
-
-		if !reflect.DeepEqual(dataset, want) {
-			t.Errorf("dataset %d: content mismatch: have %x, want %x", i, dataset, want)
-		}
-	}
-}
-
-// Tests whether the hashimoto lookup works for both light as well as the full
-// datasets.
-func TestHashimoto(t *testing.T) {
-	// Create the verification cache and mining dataset
-	cache := make([]uint32, 1024/4)
-	generateCache(cache, 0, make([]byte, 32))
-
-	dataset := make([]uint32, 32*1024/4)
-	generateDataset(dataset, 0, cache)
-
-	// Create a block to verify
-	hash := hexutil.MustDecode("0xc9149cc0386e689d789a1c2f3d5d169a61a6218ed30e74414dc736e442ef3d1f")
-	nonce := uint64(0)
-
-	wantDigest := hexutil.MustDecode("0xe4073cffaef931d37117cefd9afd27ea0f1cad6a981dd2605c4a1ac97c519800")
-	wantResult := hexutil.MustDecode("0xd3539235ee2e6f8db665c0a72169f55b7f6c605712330b778ec3944f0eb5a557")
-
-	digest, result := hashimotoLight(32*1024, cache, hash, nonce)
-	if !bytes.Equal(digest, wantDigest) {
-		t.Errorf("light hashimoto digest mismatch: have %x, want %x", digest, wantDigest)
-	}
-	if !bytes.Equal(result, wantResult) {
-		t.Errorf("light hashimoto result mismatch: have %x, want %x", result, wantResult)
-	}
-	digest, result = hashimotoFull(dataset, hash, nonce)
-	if !bytes.Equal(digest, wantDigest) {
-		t.Errorf("full hashimoto digest mismatch: have %x, want %x", digest, wantDigest)
-	}
-	if !bytes.Equal(result, wantResult) {
-		t.Errorf("full hashimoto result mismatch: have %x, want %x", result, wantResult)
-	}
-}
-
-// Tests that caches generated on disk may be done concurrently.
-func TestConcurrentDiskCacheGeneration(t *testing.T) {
-	// Create a temp folder to generate the caches into
-	cachedir, err := ioutil.TempDir("", "")
-	if err != nil {
-		t.Fatalf("Failed to create temporary cache dir: %v", err)
-	}
-	defer os.RemoveAll(cachedir)
-
-	// Define a heavy enough block, one from mainnet should do
-	block := types.NewBlockWithHeader(&types.Header{
-		Number:      big.NewInt(3311058),
-		ParentHash:  common.HexToHash("0xd783efa4d392943503f28438ad5830b2d5964696ffc285f338585e9fe0a37a05"),
-		UncleHash:   common.HexToHash("0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347"),
-		Coinbase:    common.HexToAddress("0xc0ea08a2d404d3172d2add29a45be56da40e2949"),
-		Root:        common.HexToHash("0x77d14e10470b5850332524f8cd6f69ad21f070ce92dca33ab2858300242ef2f1"),
-		TxHash:      common.HexToHash("0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421"),
-		ReceiptHash: common.HexToHash("0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421"),
-		Difficulty:  big.NewInt(167925187834220),
-		GasLimit:    big.NewInt(4015682),
-		GasUsed:     big.NewInt(0),
-		Time:        big.NewInt(1488928920),
-		Extra:       []byte("www.bw.com"),
-		MixDigest:   common.HexToHash("0x3e140b0784516af5e5ec6730f2fb20cca22f32be399b9e4ad77d32541f798cd0"),
-		Nonce:       types.EncodeNonce(0xf400cd0006070c49),
-	})
-	// Simulate multiple processes sharing the same datadir
-	var pend sync.WaitGroup
-
-	for i := 0; i < 3; i++ {
-		pend.Add(1)
-
-		go func(idx int) {
-			defer pend.Done()
-
-			ethash := NewFullEthash(cachedir, 0, 1, "", 0, 0)
-			if err := ethash.Verify(block); err != nil {
-				t.Errorf("proc %d: block verification failed: %v", idx, err)
-			}
-		}(i)
-	}
-	pend.Wait()
-}
-
-func TestTestMode(t *testing.T) {
-	head := &types.Header{Difficulty: big.NewInt(100)}
-	ethash := NewTestEthash()
-	nonce, mix := ethash.Search(types.NewBlockWithHeader(head), nil)
-	head.Nonce = types.EncodeNonce(nonce)
-	copy(head.MixDigest[:], mix)
-	if err := ethash.Verify(types.NewBlockWithHeader(head)); err != nil {
-		t.Error("unexpected Verify error:", err)
-	}
-}
-
-// Benchmarks the cache generation performance.
-func BenchmarkCacheGeneration(b *testing.B) {
-	for i := 0; i < b.N; i++ {
-		cache := make([]uint32, cacheSize(1)/4)
-		generateCache(cache, 0, make([]byte, 32))
-	}
-}
-
-// Benchmarks the dataset (small) generation performance.
-func BenchmarkSmallDatasetGeneration(b *testing.B) {
-	cache := make([]uint32, 65536/4)
-	generateCache(cache, 0, make([]byte, 32))
-
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		dataset := make([]uint32, 32*65536/4)
-		generateDataset(dataset, 0, cache)
-	}
-}
-
-// Benchmarks the light verification performance.
-func BenchmarkHashimotoLight(b *testing.B) {
-	cache := make([]uint32, cacheSize(1)/4)
-	generateCache(cache, 0, make([]byte, 32))
-
-	hash := hexutil.MustDecode("0xc9149cc0386e689d789a1c2f3d5d169a61a6218ed30e74414dc736e442ef3d1f")
-
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		hashimotoLight(datasetSize(1), cache, hash, 0)
-	}
-}
-
-// Benchmarks the full (small) verification performance.
-func BenchmarkHashimotoFullSmall(b *testing.B) {
-	cache := make([]uint32, 65536/4)
-	generateCache(cache, 0, make([]byte, 32))
-
-	dataset := make([]uint32, 32*65536/4)
-	generateDataset(dataset, 0, cache)
-
-	hash := hexutil.MustDecode("0xc9149cc0386e689d789a1c2f3d5d169a61a6218ed30e74414dc736e442ef3d1f")
-
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		hashimotoFull(dataset, hash, 0)
-	}
-}
diff --git a/pow/pow.go b/pow/pow.go
deleted file mode 100644
index 4849adb3e..000000000
--- a/pow/pow.go
+++ /dev/null
@@ -1,58 +0,0 @@
-// Copyright 2014 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package pow
-
-import (
-	"math/big"
-
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/core/types"
-)
-
-type Block interface {
-	Difficulty() *big.Int
-	HashNoNonce() common.Hash
-	Nonce() uint64
-	MixDigest() common.Hash
-	NumberU64() uint64
-}
-
-type ChainManager interface {
-	GetBlockByNumber(uint64) *types.Block
-	CurrentBlock() *types.Block
-}
-
-type PoW interface {
-	Verify(block Block) error
-	Search(block Block, stop <-chan struct{}) (uint64, []byte)
-	Hashrate() float64
-}
-
-// FakePow is a non-validating proof of work implementation.
-// It returns true from Verify for any block.
-type FakePow struct{}
-
-// Verify implements PoW, returning a success for an input.
-func (pow FakePow) Verify(block Block) error { return nil }
-
-// Search implements PoW, returning the nonce 0 for any call.
-func (pow FakePow) Search(block Block, stop <-chan struct{}) (uint64, []byte) {
-	return 0, nil
-}
-
-// Hashrate implements PoW, returning 0.
-func (pow FakePow) Hashrate() float64 { return 0 }
diff --git a/pow/xor.go b/pow/xor.go
deleted file mode 100644
index 558aeb469..000000000
--- a/pow/xor.go
+++ /dev/null
@@ -1,85 +0,0 @@
-// Copyright 2013 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Source: https://golang.org/src/crypto/cipher/xor.go
-
-package pow
-
-import (
-	"runtime"
-	"unsafe"
-)
-
-const wordSize = int(unsafe.Sizeof(uintptr(0)))
-const supportsUnaligned = runtime.GOARCH == "386" || runtime.GOARCH == "amd64" || runtime.GOARCH == "ppc64" || runtime.GOARCH == "ppc64le" || runtime.GOARCH == "s390x"
-
-// fastXORBytes xors in bulk. It only works on architectures that
-// support unaligned read/writes.
-func fastXORBytes(dst, a, b []byte) int {
-	n := len(a)
-	if len(b) < n {
-		n = len(b)
-	}
-
-	w := n / wordSize
-	if w > 0 {
-		dw := *(*[]uintptr)(unsafe.Pointer(&dst))
-		aw := *(*[]uintptr)(unsafe.Pointer(&a))
-		bw := *(*[]uintptr)(unsafe.Pointer(&b))
-		for i := 0; i < w; i++ {
-			dw[i] = aw[i] ^ bw[i]
-		}
-	}
-
-	for i := (n - n%wordSize); i < n; i++ {
-		dst[i] = a[i] ^ b[i]
-	}
-
-	return n
-}
-
-func safeXORBytes(dst, a, b []byte) int {
-	n := len(a)
-	if len(b) < n {
-		n = len(b)
-	}
-	for i := 0; i < n; i++ {
-		dst[i] = a[i] ^ b[i]
-	}
-	return n
-}
-
-// xorBytes xors the bytes in a and b. The destination is assumed to have enough
-// space. Returns the number of bytes xor'd.
-func xorBytes(dst, a, b []byte) int {
-	if supportsUnaligned {
-		return fastXORBytes(dst, a, b)
-	}
-	// TODO(hanwen): if (dst, a, b) have common alignment
-	// we could still try fastXORBytes. It is not clear
-	// how often this happens, and it's only worth it if
-	// the block encryption itself is hardware
-	// accelerated.
-	return safeXORBytes(dst, a, b)
-}
-
-// fastXORWords XORs multiples of 4 or 8 bytes (depending on architecture.)
-// The arguments are assumed to be of equal length.
-func fastXORWords(dst, a, b []byte) {
-	dw := *(*[]uintptr)(unsafe.Pointer(&dst))
-	aw := *(*[]uintptr)(unsafe.Pointer(&a))
-	bw := *(*[]uintptr)(unsafe.Pointer(&b))
-	n := len(b) / wordSize
-	for i := 0; i < n; i++ {
-		dw[i] = aw[i] ^ bw[i]
-	}
-}
-
-func xorWords(dst, a, b []byte) {
-	if supportsUnaligned {
-		fastXORWords(dst, a, b)
-	} else {
-		safeXORBytes(dst, a, b)
-	}
-}