Update ethash Godep (again)

Godeps/Godeps.json

@@ -21,8 +21,8 @@
 		},
 		{
 			"ImportPath": "github.com/ethereum/ethash",
-			"Comment": "v23.1-222-g5cfdcba",
-			"Rev": "5cfdcba92e634db228d1ddb140e3b7a3c4b38177"
+			"Comment": "v23.1-222-g173b8ff",
+			"Rev": "173b8ff953610c13710061e83b95b50c73d7ea50"
 		},
 		{
 			"ImportPath": "github.com/howeyc/fsnotify",

Godeps/_workspace/src/github.com/ethereum/ethash/ethash.go

@@ -8,7 +8,6 @@ int ethashGoCallback_cgo(unsigned);
 import "C"
 
 import (
-	"bytes"
 	"errors"
 	"fmt"
 	"io/ioutil"
@@ -122,7 +121,7 @@ func (l *Light) Verify(block pow.Block) bool {
 	}
 
 	// avoid mixdigest malleability as it's not included in a block's "hashNononce"
-	if !bytes.Equal(block.MixDigest().Bytes(), C.GoBytes(unsafe.Pointer(&ret.mix_hash), C.int(32))) {
+	if block.MixDigest() != h256ToHash(ret.mix_hash) {
 		return false
 	}
 

Godeps/_workspace/src/github.com/ethereum/ethash/ethash_test.go

@@ -39,6 +39,7 @@ var validBlocks = []*testBlock{
 		hashNoNonce: common.HexToHash("372eca2454ead349c3df0ab5d00b0b706b23e49d469387db91811cee0358fc6d"),
 		difficulty:  big.NewInt(132416),
 		nonce:       0x495732e0ed7a801c,
+		mixDigest:   common.HexToHash("2f74cdeb198af0b9abe65d22d372e22fb2d474371774a9583c1cc427a07939f5"),
 	},
 	// from proof of concept nine testnet, epoch 1
 	{
@@ -46,6 +47,7 @@ var validBlocks = []*testBlock{
 		hashNoNonce: common.HexToHash("7e44356ee3441623bc72a683fd3708fdf75e971bbe294f33e539eedad4b92b34"),
 		difficulty:  big.NewInt(1532671),
 		nonce:       0x318df1c8adef7e5e,
+		mixDigest:   common.HexToHash("144b180aad09ae3c81fb07be92c8e6351b5646dda80e6844ae1b697e55ddde84"),
 	},
 	// from proof of concept nine testnet, epoch 2
 	{
@@ -53,6 +55,7 @@ var validBlocks = []*testBlock{
 		hashNoNonce: common.HexToHash("5fc898f16035bf5ac9c6d9077ae1e3d5fc1ecc3c9fd5bee8bb00e810fdacbaa0"),
 		difficulty:  big.NewInt(2467358),
 		nonce:       0x50377003e5d830ca,
+		mixDigest:   common.HexToHash("ab546a5b73c452ae86dadd36f0ed83a6745226717d3798832d1b20b489e82063"),
 	},
 }
 
@@ -73,8 +76,9 @@ func TestEthashConcurrentVerify(t *testing.T) {
 	defer os.RemoveAll(eth.Full.Dir)
 
 	block := &testBlock{difficulty: big.NewInt(10)}
-	nonce, _ := eth.Search(block, nil)
+	nonce, md := eth.Search(block, nil)
 	block.nonce = nonce
+	block.mixDigest = common.BytesToHash(md)
 
 	// Verify the block concurrently to check for data races.
 	var wg sync.WaitGroup
@@ -98,21 +102,26 @@ func TestEthashConcurrentSearch(t *testing.T) {
 	eth.Turbo(true)
 	defer os.RemoveAll(eth.Full.Dir)
 
-	// launch n searches concurrently.
+	type searchRes struct {
+		n  uint64
+		md []byte
+	}
+
 	var (
 		block   = &testBlock{difficulty: big.NewInt(35000)}
 		nsearch = 10
 		wg      = new(sync.WaitGroup)
-		found   = make(chan uint64)
+		found   = make(chan searchRes)
 		stop    = make(chan struct{})
 	)
 	rand.Read(block.hashNoNonce[:])
 	wg.Add(nsearch)
+	// launch n searches concurrently.
 	for i := 0; i < nsearch; i++ {
 		go func() {
-			nonce, _ := eth.Search(block, stop)
+			nonce, md := eth.Search(block, stop)
 			select {
-			case found <- nonce:
+			case found <- searchRes{n: nonce, md: md}:
 			case <-stop:
 			}
 			wg.Done()
@@ -120,12 +129,14 @@ func TestEthashConcurrentSearch(t *testing.T) {
 	}
 
 	// wait for one of them to find the nonce
-	nonce := <-found
+	res := <-found
 	// stop the others
 	close(stop)
 	wg.Wait()
 
-	if block.nonce = nonce; !eth.Verify(block) {
+	block.nonce = res.n
+	block.mixDigest = common.BytesToHash(res.md)
+	if !eth.Verify(block) {
 		t.Error("Block could not be verified")
 	}
 }
@@ -140,8 +151,9 @@ func TestEthashSearchAcrossEpoch(t *testing.T) {
 	for i := epochLength - 40; i < epochLength+40; i++ {
 		block := &testBlock{number: i, difficulty: big.NewInt(90)}
 		rand.Read(block.hashNoNonce[:])
-		nonce, _ := eth.Search(block, nil)
+		nonce, md := eth.Search(block, nil)
 		block.nonce = nonce
+		block.mixDigest = common.BytesToHash(md)
 		if !eth.Verify(block) {
 			t.Fatalf("Block could not be verified")
 		}