From 3b00a77de57ab2737a7887521c192ce004c721e3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A9ter=20Szil=C3=A1gyi?= <peterke@gmail.com>
Date: Sun, 5 Mar 2017 17:38:34 +0200
Subject: [PATCH] crypto, pow: add pure Go implementation of ethash

---
 crypto/crypto.go            |   48 ++
 crypto/sha3/hashes.go       |    3 +
 crypto/sha3/keccakf_amd64.s |    2 -
 pow/ethash.go               | 1071 +++++++++++++++++++++++++++++++++++
 pow/ethash_test.go          |  722 +++++++++++++++++++++++
 pow/xor.go                  |   85 +++
 6 files changed, 1929 insertions(+), 2 deletions(-)
 create mode 100644 pow/ethash.go
 create mode 100644 pow/ethash_test.go
 create mode 100644 pow/xor.go

diff --git a/crypto/crypto.go b/crypto/crypto.go
index ecc3be3ce5..a60a4617ee 100644
--- a/crypto/crypto.go
+++ b/crypto/crypto.go
@@ -37,6 +37,11 @@ var (
 	secp256k1_halfN = new(big.Int).Div(secp256k1_N, big.NewInt(2))
 )
 
+// 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(data []byte) []byte
+
+// Keccak256 calculates and returns the Keccak256 hash of the input data.
 func Keccak256(data ...[]byte) []byte {
 	d := sha3.NewKeccak256()
 	for _, b := range data {
@@ -45,6 +50,8 @@ func Keccak256(data ...[]byte) []byte {
 	return d.Sum(nil)
 }
 
+// Keccak256Hash calculates and returns the Keccak256 hash of the input data,
+// converting it to an internal Hash data structure.
 func Keccak256Hash(data ...[]byte) (h common.Hash) {
 	d := sha3.NewKeccak256()
 	for _, b := range data {
@@ -54,6 +61,47 @@ func Keccak256Hash(data ...[]byte) (h common.Hash) {
 	return h
 }
 
+// Keccak256Hasher creates a repetitive Keccak256 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 Keccak256Hasher() Hasher {
+	hasher := sha3.NewKeccak256()
+
+	return func(data []byte) []byte {
+		hasher.Write(data)
+		result := hasher.Sum(nil)
+		hasher.Reset()
+		return result
+	}
+}
+
+// Keccak512 calculates and returns the Keccak512 hash of the input data.
+func Keccak512(data ...[]byte) []byte {
+	d := sha3.NewKeccak512()
+	for _, b := range data {
+		d.Write(b)
+	}
+	return d.Sum(nil)
+}
+
+// Keccak512Hasher creates a repetitive Keccak512 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 Keccak512Hasher() Hasher {
+	hasher := sha3.NewKeccak512()
+
+	return func(data []byte) []byte {
+		hasher.Write(data)
+		result := hasher.Sum(nil)
+		hasher.Reset()
+		return result
+	}
+}
+
 // Deprecated: For backward compatibility as other packages depend on these
 func Sha3Hash(data ...[]byte) common.Hash { return Keccak256Hash(data...) }
 
diff --git a/crypto/sha3/hashes.go b/crypto/sha3/hashes.go
index 669cd5543c..fa0d7b4362 100644
--- a/crypto/sha3/hashes.go
+++ b/crypto/sha3/hashes.go
@@ -15,6 +15,9 @@ import (
 // NewKeccak256 creates a new Keccak-256 hash.
 func NewKeccak256() hash.Hash { return &state{rate: 136, outputLen: 32, dsbyte: 0x01} }
 
+// NewKeccak512 creates a new Keccak-512 hash.
+func NewKeccak512() hash.Hash { return &state{rate: 72, outputLen: 64, dsbyte: 0x01} }
+
 // New224 creates a new SHA3-224 hash.
 // Its generic security strength is 224 bits against preimage attacks,
 // and 112 bits against collision attacks.
diff --git a/crypto/sha3/keccakf_amd64.s b/crypto/sha3/keccakf_amd64.s
index a35335178e..f88533accd 100644
--- a/crypto/sha3/keccakf_amd64.s
+++ b/crypto/sha3/keccakf_amd64.s
@@ -322,7 +322,6 @@
 // func keccakF1600(state *[25]uint64)
 TEXT ·keccakF1600(SB), 0, $200-8
 	MOVQ state+0(FP), rpState
-	SUBQ $(8*25), SP
 
 	// Convert the user state into an internal state
 	NOTQ _be(rpState)
@@ -388,5 +387,4 @@ TEXT ·keccakF1600(SB), 0, $200-8
 	NOTQ _mi(rpState)
 	NOTQ _sa(rpState)
 
-	ADDQ $(8*25), SP
 	RET
diff --git a/pow/ethash.go b/pow/ethash.go
new file mode 100644
index 0000000000..91c758d94e
--- /dev/null
+++ b/pow/ethash.go
@@ -0,0 +1,1071 @@
+// 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"
+	"io"
+	"math/big"
+	"runtime"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/crypto"
+	"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
+)
+
+var (
+	// Metadata fields to be compatible with the C++ ethash
+	ethashRevision = 23                                       // Data structure version
+	ethashMagic    = hexutil.MustDecode("0xfee1deadbaddcafe") // Dataset dump magic number
+)
+
+// 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*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*epoch - mixBytes)
+	for !new(big.Int).SetUint64(size / mixBytes).ProbablyPrime(1) { // Always accurate for n < 2^64
+		size -= 2 * mixBytes
+	}
+	return size
+}
+
+// seedHash is the seed to use for generating a vrification cache and the mining
+// dataset.
+func seedHash(block uint64) []byte {
+	seed := make([]byte, 32)
+	if block < epochLength {
+		return seed
+	}
+	keccak256 := crypto.Keccak256Hasher()
+	for i := 0; i < int(block/epochLength); i++ {
+		seed = keccak256(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.
+func generateCache(size uint64, seed []byte) []byte {
+	// Print some debug logs to allow analysis on low end devices
+	logger := log.New("size", size, "seed", hexutil.Bytes(seed))
+	logger.Debug("Generating ethash cache")
+
+	defer func(start time.Time) {
+		logger.Debug("Generated ethash cache", "elapsed", common.PrettyDuration(time.Since(start)))
+	}(time.Now())
+
+	// Calculate the number of thoretical rows (we'll store in one buffer nonetheless)
+	rows := int(size) / hashBytes
+
+	// Create a hasher to reuse between invocations
+	keccak512 := crypto.Keccak512Hasher()
+
+	// Sequentially produce the initial dataset
+	cache := make([]byte, size)
+	copy(cache, keccak512(seed))
+	for offset := uint64(hashBytes); offset < size; offset += hashBytes {
+		copy(cache[offset:], keccak512(cache[offset-hashBytes:offset]))
+	}
+	// 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])
+			copy(cache[dstOff:], keccak512(temp))
+		}
+	}
+	return cache
+}
+
+// prepare convers 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(size uint64, r io.Reader) []uint32 {
+	ints := make([]uint32, size/4)
+
+	buffer := make([]byte, 4)
+	for i := 0; i < len(ints); i++ {
+		io.ReadFull(r, buffer)
+		ints[i] = binary.LittleEndian.Uint32(buffer)
+	}
+	return ints
+}
+
+// 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 crypto.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)])
+	}
+	mix = keccak512(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)
+	}
+	return keccak512(mix)
+}
+
+// generateDataset generates the entire ethash dataset for mining.
+func generateDataset(size uint64, cache []uint32) []byte {
+	// Print some debug logs to allow analysis on low end devices
+	logger := log.New("size", size)
+	logger.Debug("Generating ethash dataset")
+
+	defer func(start time.Time) {
+		logger.Debug("Generated ethash dataset", "elapsed", common.PrettyDuration(time.Since(start)))
+	}(time.Now())
+
+	// Generate the dataset on many goroutines since it takes a while
+	dataset := make([]byte, size)
+	threads := runtime.NumCPU()
+
+	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 := crypto.Keccak512Hasher()
+
+			// Calculate the data segment this thread should generate
+			batch := uint32(size / hashBytes / uint64(threads))
+			start := uint32(id) * batch
+			limit := start + batch
+			if limit > uint32(size/hashBytes) {
+				limit = uint32(size / hashBytes)
+			}
+			// Calculate the dataset segment
+			percent := uint32(size / hashBytes / 100)
+			for index := start; index < limit; index++ {
+				copy(dataset[index*hashBytes:], generateDatasetItem(cache, index, keccak512))
+
+				if status := atomic.AddUint32(&progress, 1); status%percent == 0 {
+					logger.Info("Generating DAG in progress", "percentage", uint64(status*100)/(size/hashBytes))
+				}
+			}
+		}(i)
+	}
+	// Wait for all the generators to finish and return
+	pend.Wait()
+
+	return dataset
+}
+
+// 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 := crypto.Keccak512Hasher()
+
+	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(size uint64, 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, size, 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,
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+	14663284864, 14671675264, 14680061056, 14688447616, 14696835968,
+	14705228416, 14713616768, 14722003328, 14730392192, 14738784128,
+	14747172736, 14755561088, 14763947648, 14772336512, 14780725376,
+	14789110144, 14797499776, 14805892736, 14814276992, 14822670208,
+	14831056256, 14839444352, 14847836032, 14856222848, 14864612992,
+	14872997504, 14881388672, 14889775744, 14898165376, 14906553472,
+	14914944896, 14923329664, 14931721856, 14940109696, 14948497024,
+	14956887424, 14965276544, 14973663616, 14982053248, 14990439808,
+	14998830976, 15007216768, 15015605888, 15023995264, 15032385152,
+	15040768384, 15049154944, 15057549184, 15065939072, 15074328448,
+	15082715008, 15091104128, 15099493504, 15107879296, 15116269184,
+	15124659584, 15133042304, 15141431936, 15149824384, 15158214272,
+	15166602368, 15174991232, 15183378304, 15191760512, 15200154496,
+	15208542592, 15216931712, 15225323392, 15233708416, 15242098048,
+	15250489216, 15258875264, 15267265408, 15275654528, 15284043136,
+	15292431488, 15300819584, 15309208192, 15317596544, 15325986176,
+	15334374784, 15342763648, 15351151744, 15359540608, 15367929728,
+	15376318336, 15384706432, 15393092992, 15401481856, 15409869952,
+	15418258816, 15426649984, 15435037568, 15443425664, 15451815296,
+	15460203392, 15468589184, 15476979328, 15485369216, 15493755776,
+	15502146944, 15510534272, 15518924416, 15527311232, 15535699072,
+	15544089472, 15552478336, 15560866688, 15569254528, 15577642624,
+	15586031488, 15594419072, 15602809472, 15611199104, 15619586432,
+	15627975296, 15636364928, 15644753792, 15653141888, 15661529216,
+	15669918848, 15678305152, 15686696576, 15695083136, 15703474048,
+	15711861632, 15720251264, 15728636288, 15737027456, 15745417088,
+	15753804928, 15762194048, 15770582656, 15778971008, 15787358336,
+	15795747712, 15804132224, 15812523392, 15820909696, 15829300096,
+	15837691264, 15846071936, 15854466944, 15862855808, 15871244672,
+	15879634816, 15888020608, 15896409728, 15904799104, 15913185152,
+	15921577088, 15929966464, 15938354816, 15946743424, 15955129472,
+	15963519872, 15971907968, 15980296064, 15988684928, 15997073024,
+	16005460864, 16013851264, 16022241152, 16030629248, 16039012736,
+	16047406976, 16055794816, 16064181376, 16072571264, 16080957824,
+	16089346688, 16097737856, 16106125184, 16114514816, 16122904192,
+	16131292544, 16139678848, 16148066944, 16156453504, 16164839552,
+	16173236096, 16181623424, 16190012032, 16198401152, 16206790528,
+	16215177344, 16223567744, 16231956352, 16240344704, 16248731008,
+	16257117824, 16265504384, 16273898624, 16282281856, 16290668672,
+	16299064192, 16307449216, 16315842176, 16324230016, 16332613504,
+	16341006464, 16349394304, 16357783168, 16366172288, 16374561664,
+	16382951296, 16391337856, 16399726208, 16408116352, 16416505472,
+	16424892032, 16433282176, 16441668224, 16450058624, 16458448768,
+	16466836864, 16475224448, 16483613056, 16492001408, 16500391808,
+	16508779648, 16517166976, 16525555328, 16533944192, 16542330752,
+	16550719616, 16559110528, 16567497088, 16575888512, 16584274816,
+	16592665472, 16601051008, 16609442944, 16617832064, 16626218624,
+	16634607488, 16642996096, 16651385728, 16659773824, 16668163712,
+	16676552576, 16684938112, 16693328768, 16701718144, 16710095488,
+	16718492288, 16726883968, 16735272832, 16743661184, 16752049792,
+	16760436608, 16768827008, 16777214336, 16785599104, 16793992832,
+	16802381696, 16810768768, 16819151744, 16827542656, 16835934848,
+	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,
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+	273153856, 273284672, 273415616, 273547072, 273677632, 273808448,
+	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,
+	280230976, 280361408, 280493632, 280622528, 280755392, 280887104,
+	281018176, 281147968, 281278912, 281411392, 281542592, 281673152,
+	281803712, 281935552, 282066496, 282197312, 282329024, 282458816,
+	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_test.go b/pow/ethash_test.go
new file mode 100644
index 0000000000..43d899e219
--- /dev/null
+++ b/pow/ethash_test.go
@@ -0,0 +1,722 @@
+// 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"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common/hexutil"
+)
+
+// 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)
+		}
+	}
+}
+
+// Tests that verification caches can be correctly generated.
+func TestCacheGeneration(t *testing.T) {
+	tests := []struct {
+		size  uint64
+		seed  []byte
+		cache []byte
+	}{
+		{
+			size: 1024,
+			seed: make([]byte, 32),
+			cache: hexutil.MustDecode("0x" +
+				"7ce2991c951f7bf4c4c1bb119887ee07871eb5339d7b97b8588e85c742de90e5bafd5bbe6ce93a134fb6be9ad3e30db99d9528a2ea7846833f52e9ca119b6b54" +
+				"8979480c46e19972bd0738779c932c1b43e665a2fd3122fc3ddb2691f353ceb0ed3e38b8f51fd55b6940290743563c9f8fa8822e611924657501a12aafab8a8d" +
+				"88fb5fbae3a99d14792406672e783a06940a42799b1c38bc28715db6d37cb11f9f6b24e386dc52dd8c286bd8c36fa813dffe4448a9f56ebcbeea866b42f68d22" +
+				"6c32aae4d695a23cab28fd74af53b0c2efcc180ceaaccc0b2e280103d097a03c1d1b0f0f26ce5f32a90238f9bc49f645db001ef9cd3d13d44743f841fad11a37" +
+				"fa290c62c16042f703578921f30b9951465aae2af4a5dad43a7341d7b4a62750954965a47a1c3af638dc3495c4d62a9bab843168c9fc0114e79cffd1b2827b01" +
+				"75d30ba054658f214e946cf24c43b40d3383fbb0493408e5c5392434ca21bbcf43200dfb876c713d201813934fa485f48767c5915745cf0986b1dc0f33e57748" +
+				"bf483ee2aff4248dfe461ec0504a13628401020fc22638584a8f2f5206a13b2f233898c78359b21c8226024d0a7a93df5eb6c282bdbf005a4aab497e096f2847" +
+				"76c71cee57932a8fb89f6d6b8743b60a4ea374899a94a2e0f218d5c55818cefb1790c8529a76dba31ebb0f4592d709b49587d2317970d39c086f18dd244291d9" +
+				"eedb16705e53e3350591bd4ff4566a3595ac0f0ce24b5e112a3d033bc51b6fea0a92296dea7f5e20bf6ee6bc347d868fda193c395b9bb147e55e5a9f67cfe741" +
+				"7eea7d699b155bd13804204df7ea91fa9249e4474dddf35188f77019c67d201e4c10d7079c5ad492a71afff9a23ca7e900ba7d1bdeaf3270514d8eb35eab8a0a" +
+				"718bb7273aeb37768fa589ed8ab01fbf4027f4ebdbbae128d21e485f061c20183a9bc2e31edbda0727442e9d58eb0fe198440fe199e02e77c0f7b99973f1f74c" +
+				"c9089a51ab96c94a84d66e6aa48b2d0a4543adb5a789039a2aa7b335ca85c91026c7d3c894da53ae364188c3fd92f78e01d080399884a47385aa792e38150cda" +
+				"a8620b2ebeca41fbc773bb837b5e724d6eb2de570d99858df0d7d97067fb8103b21757873b735097b35d3bea8fd1c359a9e8a63c1540c76c9784cf8d975e995c" +
+				"778401b94a2e66e6993ad67ad3ecdc2acb17779f1ea8606827ec92b11c728f8c3b6d3f04a3e6ed05ff81dd76d5dc5695a50377bc135aaf1671cf68b750315493" +
+				"6c64510164d53312bf3c41740c7a237b05faf4a191bd8a95dafa068dbcf370255c725900ce5c934f36feadcfe55b687c440574c1f06f39d207a8553d39156a24" +
+				"845f64fd8324bb85312979dead74f764c9677aab89801ad4f927f1c00f12e28f22422bb44200d1969d9ab377dd6b099dc6dbc3222e9321b2c1e84f8e2f07731c"),
+		},
+		{
+			size: 1024,
+			seed: hexutil.MustDecode("0x290decd9548b62a8d60345a988386fc84ba6bc95484008f6362f93160ef3e563"),
+			cache: hexutil.MustDecode("0x" +
+				"1f56855d59cc5a085720899b4377a0198f1abe948d85fe5820dc0e346b7c0931b9cde8e541d751de3b2b3275d0aabfae316209d5879297d8bd99f8a033c9d4df" +
+				"35add1029f4e6404a022d504fb8023e42989aba985a65933b0109c7218854356f9284983c9e7de97de591828ae348b63d1fc78d8db58157344d4e06530ffd422" +
+				"5c7f6080d451ff94961ec2dd9e28e6d81b49102451676dbdcb6ef1094c1e8b29e7e808d47b2ba5aeb52dabf00d5f0ee08c116289cbf56d8132e5ca557c3d6220" +
+				"5ba3a48539acabfd4ca3c89e3aaa668e24ffeaeb9eb0136a9fc5a8a676b6d5ad76175eeda0a1fa44b5ff5591079e4b7f581569b6c82416adcb82d7e92980df67" +
+				"2248c4024013e7be52cf91a82491627d9e6d80eda2770ab82badc5e120cd33a4c84495f718b57396a8f397e797087fad81fa50f0e2f5da71e40816a85de35a96" +
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+				"1aea89e20b15a5d1264ab01d1556bfc2a266081609d60928216bd9646038f07de9fedcc9f2b86ab1b07d7bd88ba1df08b3d89b2ac789001b48a723f217debcb7" +
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+				"7c42781d1477fe03ea0772998e776d63363c6c3edd2d52c89b4d2c9d89cdd90fa33b2b41c8e3f78ef06fe90bcf5cc5756d33a032f16b744141aaa8852bb4cb3a" +
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+				"fe70f7b8d8f384aa06e2c9964c92a8788cef397fffdd35181b42a35d5d98cd7244bbd09e802888d7efc0311ae58e0961e3656205df4bdc553f317df4b6ede4ca" +
+				"846294a32aec830ab1aa5aac4e78b821c35c70fd752fec353e373bf9be656e775a0111bcbeffdfebd3bd5251d27b9f6971aa561a2bd27a99d61b2ce3965c3726" +
+				"1e114353e6a31b09340f4078b8a8c6ce6ff4213067a8f21020f78aff4f8b472b701ef730aacb8ce7806ea31b14abe8f8efdd6357ca299d339abc4e43ba324ad1" +
+				"efe6eb1a5a6e137daa6ec9f6be30931ca368a944cfcf2a0a29f9a9664188f0466e6f078c347f9fe26a9a89d2029462b19245f24ace47aecace6ef85a4e96b31b" +
+				"5f470eb0165c6375eb8f245d50a25d521d1e569e3b2dccce626752bb26eae624a24511e831a81fab6898a791579f462574ca4851e6588116493dbccc3072e0c5"),
+		},
+	}
+	for i, tt := range tests {
+		if cache := generateCache(tt.size, tt.seed); !bytes.Equal(cache, tt.cache) {
+			t.Errorf("cache %d: content mismatch: have %x, want %x", i, cache, tt.cache)
+		}
+	}
+}
+
+func TestDatasetGeneration(t *testing.T) {
+	tests := []struct {
+		cacheSize   uint64
+		cacheSeed   []byte
+		datasetSize uint64
+		dataset     []byte
+	}{
+		{
+			cacheSize:   1024,
+			cacheSeed:   make([]byte, 32),
+			datasetSize: 32 * 1024,
+			dataset: hexutil.MustDecode("0x" +
+				"4bc09fbd530a041dd2ec296110a29e8f130f179c59d223f51ecce3126e8b0c74326abc2f32ccd9d7f976bd0944e3ccf8479db39343cbbffa467046ca97e2da63" +
+				"da5f9d9688c7c33ab7b8aace570e422fa48b24659b72fc534669209d66389ca15b099c5604601e7581488e3bd6925cec0f12d465f8004d4fa84793f8e1e46a1b" +
+				"31b7298991c6142f4f0b6e6b296728ae5fa63ccb667b61fbb1b078003d18d97b906af157debed5e6c55d5a61cae90c85f9e97d565314a2f9fd9e0c08430547d0" +
+				"7cfcee3271f921b95c32a11596219abaa30abc62c2c72c6725078c436c677320594df6bcb92134c1b114fffec982a1f68f13a9f812f074b9fb9c78f2cd4c1c90" +
+				"7ebf1e447f7a422b06303921e3d54f430584d849eaa4b7d652e92a5d659bdfc462adcdd7991e8c66a19da4ddb5390463d073941491859397f135ebbbdbdf5801" +
+				"cafb873c383893390141ae385515504d74a33608273310c312ba468046d2e20c271a38cc0e3920b39705050e752f34f244fc23ddd17ff18677756a87671d4145" +
+				"3aebf97e4890da1d645f41eb20da92a8537c787ce419580073c46aa3bb154952993142ec5b4fb6e8f108fd15fc618cd5c27b45a37ee6dcd52a4ce656c0f58604" +
+				"717ec55f5e592355f1f20e8316f8fd77243734a8b0f50ad93c1d95b5b0482afb22cd0667d935bd6053d7198b54974e10d100df7ca3ec2e0bb5ccce5807b266e0" +
+				"8429d5fec2ae6ae1cc7c5efc27f19c89d4b4a6c5c0b9397886dac635ba37446ff528b582457a4fe7f803f1a47903574f8982d4a679b627396a4e97aaa12fa179" +
+				"0d31ba52e9010bc3c26ace81f702f86649fe9eeda9ec03b74a8a5cf540d82e22af33ab893564397dfc4edd8b1677350df5b82ab61d24db95f58fd2d78afb49c7" +
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+				"d2a239e8589017197c343b81540bc26bc52bffd5336fb1da1202a511c7175014d2f500b9d9ce78e4b9f2b158d0fb27af352b6f78c129cad642fe909612c9d658" +
+				"17a8d7f9195ee97201675a918e3cf520fdc19f92b7e6a3db806d4f3799361334082cc58a22ddb4e4f5760bd1667c177b26be325166c6bbed669a158fc87acd43" +
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+				"973e558f39465dff43bf23cf1f78957514e4e82a3009d40d97bf8d8442a11deabde806e2fa84c1ba75273da75ce8dad3b2a34786b2958ac4bfd248ebe604a173" +
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+				"7db422bbad7eaa0824ce24b5c186e172c8c584f1cc5c126c901a69ebee8dbd230a653a3643b7875672d22fd86079daf8d834ba33664f5ad0b6eec767b4f58b45" +
+				"e67b776b90e0a5e130aa5365003eb7fd78b757b1cf9133f6a1d51064b293cb42c8c41b15b7e95e2a39fa5dae19c6e20031d2bfa4632c37779163fdecc6b45624" +
+				"4d6bfd01a8877f6fe7739591917a86e7dd795ad85cc3f256cff5961e8b62e92a0754a51f2c6d59819446eec8bdd08b87cf9f4fb5373e809d52240d2dd691cd50" +
+				"37fc79d35b61d63851917cfdba164868a3f79e2061bd4610c1f5216ed77df00baa75f949ad37142db4fd282a5c7d2e2636ca590f92fc4781d4f51efa69f53947" +
+				"d4fca1dc7dd2429837b6d7e5c9528effdecf6f731f676587785e5c4096bdb6f1f44e72f5f77d9025813e848881506f65bfb0f2b2d3ae6f9e00731929b5ac083d" +
+				"b1c9c324703e63fef6319e1d8150aa0ff7d9a2049961df9158f3e1f2e540a91feb742625d2a859a452186d2ccaa3ec2ba086ee0868a4dc24ae6818fc02f9c1df" +
+				"dc326cc31c46feefda97265238592f638968627ec24903b97513ab05ed58ce5b516decda0e2fbf01a70e6cb2e53c3e7b8855f80cd7e007b78da727ef0893e099" +
+				"592ba684d62ae2d1f06ad148fa7f34cfc724d804149cda21aee7eac064ad20d29132b260c2c2867fa6a2e747739fc30df2f002c2a99da6c7e64ee51e806af7d9" +
+				"768aec456b93a05002666cb61b2229c99f2cdef9afc9cea1c4ee3a85dd189823399781ee33cde2abedff09c47960c035e075a29156005d75845a11fa06abcc50" +
+				"5f7f849a0caaf683f334e9e7bbbef90fe6cf94cbf87767219440d31713daef6ad1e4a1cc720ce59fee4cf7731e46bbba9ec1648908ea345030aa8f10ade10ffa" +
+				"3d2acfd480b0b11eadc4fb2b740596b204e911456cb2f35ad9993ab7dd6a48b35ba0c207625384bb3c2ff24437810bd13c7ee96cd6f97f19ffd537ad182a3657" +
+				"b0e83d42fd6e2ebac6cbf5ea1bde97465b7cec6954ff5b5be049e59a49ea25ed6667dbace765401bde12031e5cfabf2df7afb728d2a0b2a38b24d79bf23a313c" +
+				"40fe5adef97487641c6088dd8712c0c352708e474b02c08fd2d71b6d44f16d82f291ccd61c43a339408379a8de54cfdbbae5e421e084112fbc17fb5561e084d1" +
+				"4149bf4bb06fd161878d8574f856867cff974d5898e161923d55bdac8699c9df6a220bcb6c800d3ae7f107b8c4acab206d780aafaf6c2e2379de8c900700d9c9" +
+				"c87d464772514c5aa3e5f5bfc00fb54f2b74702838b4731c5ac8a070b50783e81dd97fa8d55c739d026b607a2a78aba1bb79b1a7a3c22c78368672ac020061e6" +
+				"d9683d57d6989c6c6f08b8d5d74720f5cb25505fbe81d2bf53a68e972a54784705b20f83fd1ab5afff30764ef89dba4465b56f48b325ab3810bf8dcbf4faa61f" +
+				"676e2043ac8540df9e3af4c0f51d816e89c09bf67253be45fc5f75f64be97f6c7dc0c6392af6fa8e75aab58eda976b36773cd37d315771400a2cb846fdef3d8a" +
+				"a15bce5dfda0379e526f87cf67767a2ab93d41c85b4ed016ed0a89d2f94737433a3ebade813def29eaa18a1fb925fca7d08d1020f64caebc562cb4ad2fb241e2" +
+				"94923b2f2df5e6c4953c4b73be0f5568defe57ce49d16e2a205323e46cbb5a3e77fff1557671503bd7b5de5320f1fb951fbe26400cfa854af2d12fab0215310c" +
+				"f070add34dc4565d1757d7e10a03e3bb73a607ed7e10861b1274ddee76183cf7e56c1de7162c805c2dba0e0331d36f3a4e2019a2e0705ee2747ed1e52bc3a6fb" +
+				"3b061f784348204cdf8d643ff6c271fa72b56900edcc2f77201f3bd4fc296ad6534a7029ea66761bb9a3589a1f6ef566504c70297b98fbb603214fed2e4b7ca1" +
+				"06e3f0e993118897fa641fb9722d4667fa98d07a6837e5ab2144e5ec1548a7dbca28c559f2a9a99d54b8e55f56d0e59bcef1ac45e2046835b60579da0d2261e7" +
+				"30dab9009d138421c6458d146e870358b0b3fa20257e50b58f167c6b47edf7053513d58f33547d06ce52458baaa4dcf15f77b103565c66a81f183c827801b455" +
+				"b61b6287a46a37a96884075a7eada9ba7f0ddcc14654bf87a26d2e27a978b415257773796923a220e06b25af16fb5aaded9b2d081a4c64106df460ddce9c3b2a" +
+				"c8553e1521e501ad29a4b7f7681c9b60576a127087a5237c4c2bacf9b163dd590e63f2bc80e7f1e613773f87d034313064710404739d63363d204be7b14800c4" +
+				"d8c1b6a2a21da70223be51d281fee302ef806454f9d7d28244ba537c1d9f8f1bcc5d47038d986a8f95ca48437ffe94fd44a90bb03014a259112a97508adb3db4" +
+				"34f72a5268c1af6bc6d5801e579aab2228ca33600ebbf1a1959081c3a4ca99e444f97409f5e0ca4779241c9aacad1f4ee7fb4369bd6ae076378e4f63000b9a5c" +
+				"849ba6e72e47e2454a44659149338ac0767cd25d8693c0d143e354bd600f1c1d3a44eeb024923ea659060665d5cd9a4ca1ca86162819556535fd59b9fde90caa" +
+				"29920efe99479fe7e4b4e5371e13ccb43a1419cf023433239d840900d31bab37fabc3fd20e31bb7dbcb3ae8df66f67e2844944bcf544b658364f9e3d0b6d84b4" +
+				"63ad4eb621644fd7d774b501407a1178814b15149345d551b474347188067db2ab4d7f4d1abd3027133039e855e129f3f5649550da8c04fe2db57cb89bf1bf4f" +
+				"72eb35ccfe31afb92f6136d4c2a1c115b07b721b2da43151f11c356256230408979c5d95243714429e2c9500e7b043b20dac8a9763e5b487d1cbdb34ac379b9c" +
+				"6409454c79385b6e562459c4fdaad1b7f9297c1473e9b90fffe6d1c5390e241a187a4cefa2eb0cb0c11f4ca6c5b961c18ceb57892295290dbc991692556bffa3" +
+				"b8c405cf285e6bcb8a90246ad0ac15122f4cf73adc129d23aa2240733404beb6d74bf698e5589288a522573c774ce9f514b5d5c086382ea1dd4e89ff5facbf23" +
+				"d36bc3d203941e17747ede4b82820351f4df278ddb787ce8f6f1cc468ef953399efb072ce706e253f1bab76444bb70be6443cd0db633e958dc57bd223e00418e" +
+				"915a7c2e4d94c0623f9788276480cdfe798387d35e2ea2d304d066aec7627794cdd4200a44208d6c87f242c76e2d4a3f966b6fb96eaa63d892c1a177bef249b4" +
+				"fdd1a4c06c791f677dd9919f739ccf318bd77835330b0219786249c9c9736161dac771a838724f2dd70afba46a6782fd27601cf8a7126ae95a66e526131a68d7" +
+				"7a809e513533ed8021eecdbc5851dfcf95e10f1bbe47b5c7f079275a1837836245266b66d89fab25ac4bd6c1225560bea3259b67bf50a58ee056754d574da79e" +
+				"f9a1a0df3a5defed0f74fe74ce0bf65a04086f17e94a8451828c723c97932f26f9349f1a2c7866c617a528602721de4f3cc8916bcfc66cdc106bafa26ea87a13" +
+				"94dfa37e396365fb7f92df007b46a50ff04c7f85bfa679230ebedf18c2fb876fc7098dd1c4328adf85de71c31d94687a308053bfcdc158cfa7772170fbed63f5" +
+				"37dda41f65196dfacdd1186b5de0f3369d841ce6502192292d05a19ce7464f5bcab3015c721cac13ddca561b92dc1ee25d3068dc1945a1b4e2bd1e6604c42e4c" +
+				"3c04b490f6365828957990007394557854a903e19feb06906e41cbc8766bf37bd7dece90f4cdc987709b1129e84bfdc502543b5bfa887bf78553a5ec10ad68c5" +
+				"d10eff75f7aa495e7d934a55577fdc0aead31aee4522db0259d7d4ea8438a7996d80a787465a2980457193d1c4bf1a0a1e01741d72e5fc4dfe58475c1c01026b" +
+				"5a3bc973b902280753e9c3226db9cc778e2506c56ee86ae85b4d54dbf05394107329b2d1ee56522cb1ce562fb1aa4e592199d9c29f64cc3ab1d757531e209eec" +
+				"aa138d8388169b5e28c45f5aba267eeaa57f69869f0b6855d82b0eafcde63895251f41e8e676a0ab12ef3f569bb7de91b79fa46ad9637da01ca004f4d30259c1" +
+				"f5b00761f6ca9c17721a6718390624a10a11f7f52d7afb71ee5f8338828910e48f94a1347761abac87897b2dd0e23f1d325aec5031ef58f2972e8b402e05f8c1" +
+				"ae7053a90380a1ae0d4d06645548c23e13afa31aac8ff83b10f8341418af4114632f6406d6e33076391696c9161d63c8bcfd1c625fc737f68198046212d1638a" +
+				"d2d2d42ff7029c1fcc682a046edc4d4f24862d82c600180b1e8f57ff6a3865dfe9274f9886d00efa523a1b3b3757c4489200fec3dc5583854c955492336253dd" +
+				"767f2a60ce3d224afcff9cdc19e9b28830d33affda6af99942a8fe39562055f3e884fd6c1ebc1908ac159061f35e9b0da80434ce9673d9c6b87265170077c670" +
+				"743e37474d7605cd01c44af600f16d9ffaf24acf87fbe5ccf39bac41047a810d210051c87f06147a0bb8f1427a406700483679638f1af23f1dafb7aa0c468669" +
+				"71c3a82f535c26cf6cb335e8e915fda393799d3dbe0e04b907ed3612d12ac95783a6876cd986d2a13b82192532e02c250eaa42f891d2481655fa4494c723fe00" +
+				"87d224444245eb5b0eade5f741b025db1992a8ad0dce51b0c1af4a18a9e244f9f755891adf0f19179c7baa6c32bffc91e0b03c4ed3aaee1978b6a1f03b87ac6a" +
+				"fc3b9e7030bb212b17de198edfccde29d04224798c1204e47ea235f048724fac62d637d1ba0ee3922048fcf79c746b6c0c036d882e3491fd72bad6e009c6403e" +
+				"55876f4d31330caa02aedd0b0c121c3c41e736853a08071f0dd4ddc7412db0bbe274a9ac2932552bb37c40e72c2ef1d7cca8236942e480d709d3ea9d5ae0a1b7",
+			),
+		},
+	}
+	for i, tt := range tests {
+		rawCache := generateCache(tt.cacheSize, tt.cacheSeed)
+		cache := prepare(uint64(len(rawCache)), bytes.NewReader(rawCache))
+
+		if dataset := generateDataset(tt.datasetSize, cache); !bytes.Equal(dataset, tt.dataset) {
+			t.Errorf("dataset %d: content mismatch: have %x, want %x", i, dataset, tt.dataset)
+		}
+	}
+}
+
+// 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
+	var (
+		rawCache   = generateCache(1024, make([]byte, 32))
+		cache      = prepare(uint64(len(rawCache)), bytes.NewReader(rawCache))
+		rawDataset = generateDataset(32*1024, cache)
+		dataset    = prepare(uint64(len(rawDataset)), bytes.NewReader(rawDataset))
+	)
+	// 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(32*1024, 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)
+	}
+}
+
+// Becnhmarks the cache generation performance.
+func BenchmarkCacheGeneration(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		generateCache(cacheSize(1), make([]byte, 32))
+	}
+}
+
+// Becnhmarks the dataset (small) generation performance.
+func BenchmarkSmallDatasetGeneration(b *testing.B) {
+	rawCache := generateCache(65536, make([]byte, 32))
+	cache := prepare(uint64(len(rawCache)), bytes.NewReader(rawCache))
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		generateDataset(32*65536, cache)
+	}
+}
+
+// Becnhmarks the light verification performace.
+func BenchmarkHashimotoLight(b *testing.B) {
+	var (
+		rawCache = generateCache(cacheSize(1), make([]byte, 32))
+		cache    = prepare(uint64(len(rawCache)), bytes.NewReader(rawCache))
+		hash     = hexutil.MustDecode("0xc9149cc0386e689d789a1c2f3d5d169a61a6218ed30e74414dc736e442ef3d1f")
+	)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		hashimotoLight(datasetSize(1), cache, hash, 0)
+	}
+}
+
+// Becnhmarks the full (small) verification performace.
+func BenchmarkHashimotoFullSmall(b *testing.B) {
+	var (
+		rawCache   = generateCache(65536, make([]byte, 32))
+		cache      = prepare(uint64(len(rawCache)), bytes.NewReader(rawCache))
+		rawDataset = generateDataset(32*65536, cache)
+		dataset    = prepare(uint64(len(rawDataset)), bytes.NewReader(rawDataset))
+		hash       = hexutil.MustDecode("0xc9149cc0386e689d789a1c2f3d5d169a61a6218ed30e74414dc736e442ef3d1f")
+	)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		hashimotoFull(32*65536, dataset, hash, 0)
+	}
+}
diff --git a/pow/xor.go b/pow/xor.go
new file mode 100644
index 0000000000..558aeb4690
--- /dev/null
+++ b/pow/xor.go
@@ -0,0 +1,85 @@
+// 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)
+	}
+}