Updated dependencies and added avct/uasurfer (#8089)

* Updated dependencies and added avct/uasurfer

* Added uasurfer to NOTICE.txt

52 files changed, 1573 insertions, 245 deletions

diff --git a/vendor/golang.org/x/crypto/acme/acme_test.go b/vendor/golang.org/x/crypto/acme/acme_test.go
index b44af5959..89f2efaa5 100644
--- a/vendor/golang.org/x/crypto/acme/acme_test.go
+++ b/vendor/golang.org/x/crypto/acme/acme_test.go
@@ -946,7 +946,7 @@ func TestNonce_add(t *testing.T) {
 	c.addNonce(http.Header{"Replay-Nonce": {}})
 	c.addNonce(http.Header{"Replay-Nonce": {"nonce"}})
 
-	nonces := map[string]struct{}{"nonce": struct{}{}}
+	nonces := map[string]struct{}{"nonce": {}}
 	if !reflect.DeepEqual(c.nonces, nonces) {
 		t.Errorf("c.nonces = %q; want %q", c.nonces, nonces)
 	}
diff --git a/vendor/golang.org/x/crypto/argon2/argon2.go b/vendor/golang.org/x/crypto/argon2/argon2.go
new file mode 100644
index 000000000..71cf8c556
--- /dev/null
+++ b/vendor/golang.org/x/crypto/argon2/argon2.go
@@ -0,0 +1,228 @@
+// Copyright 2017 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.
+
+// Package argon2 implements the key derivation function Argon2.
+// Argon2 was selected as the winner of the Password Hashing Competition and can
+// be used to derive cryptographic keys from passwords.
+// Argon2 is specfifed at https://github.com/P-H-C/phc-winner-argon2/blob/master/argon2-specs.pdf
+package argon2
+
+import (
+	"encoding/binary"
+	"sync"
+
+	"golang.org/x/crypto/blake2b"
+)
+
+// The Argon2 version implemented by this package.
+const Version = 0x13
+
+const (
+	argon2d = iota
+	argon2i
+	argon2id
+)
+
+// Key derives a key from the password, salt, and cost parameters using Argon2i
+// returning a byte slice of length keyLen that can be used as cryptographic key.
+// The CPU cost and parallism degree must be greater than zero.
+//
+// For example, you can get a derived key for e.g. AES-256 (which needs a 32-byte key) by doing:
+// `key := argon2.Key([]byte("some password"), salt, 4, 32*1024, 4, 32)`
+//
+// The recommended parameters for interactive logins as of 2017 are time=4, memory=32*1024.
+// The number of threads can be adjusted to the numbers of available CPUs.
+// The time parameter specifies the number of passes over the memory and the memory
+// parameter specifies the size of the memory in KiB. For example memory=32*1024 sets the
+// memory cost to ~32 MB.
+// The cost parameters should be increased as memory latency and CPU parallelism increases.
+// Remember to get a good random salt.
+func Key(password, salt []byte, time, memory uint32, threads uint8, keyLen uint32) []byte {
+	return deriveKey(argon2i, password, salt, nil, nil, time, memory, threads, keyLen)
+}
+
+func deriveKey(mode int, password, salt, secret, data []byte, time, memory uint32, threads uint8, keyLen uint32) []byte {
+	if time < 1 {
+		panic("argon2: number of rounds too small")
+	}
+	if threads < 1 {
+		panic("argon2: parallelism degree too low")
+	}
+	h0 := initHash(password, salt, secret, data, time, memory, uint32(threads), keyLen, mode)
+
+	memory = memory / (syncPoints * uint32(threads)) * (syncPoints * uint32(threads))
+	if memory < 2*syncPoints*uint32(threads) {
+		memory = 2 * syncPoints * uint32(threads)
+	}
+	B := initBlocks(&h0, memory, uint32(threads))
+	processBlocks(B, time, memory, uint32(threads), mode)
+	return extractKey(B, memory, uint32(threads), keyLen)
+}
+
+const (
+	blockLength = 128
+	syncPoints  = 4
+)
+
+type block [blockLength]uint64
+
+func initHash(password, salt, key, data []byte, time, memory, threads, keyLen uint32, mode int) [blake2b.Size + 8]byte {
+	var (
+		h0     [blake2b.Size + 8]byte
+		params [24]byte
+		tmp    [4]byte
+	)
+
+	b2, _ := blake2b.New512(nil)
+	binary.LittleEndian.PutUint32(params[0:4], threads)
+	binary.LittleEndian.PutUint32(params[4:8], keyLen)
+	binary.LittleEndian.PutUint32(params[8:12], memory)
+	binary.LittleEndian.PutUint32(params[12:16], time)
+	binary.LittleEndian.PutUint32(params[16:20], uint32(Version))
+	binary.LittleEndian.PutUint32(params[20:24], uint32(mode))
+	b2.Write(params[:])
+	binary.LittleEndian.PutUint32(tmp[:], uint32(len(password)))
+	b2.Write(tmp[:])
+	b2.Write(password)
+	binary.LittleEndian.PutUint32(tmp[:], uint32(len(salt)))
+	b2.Write(tmp[:])
+	b2.Write(salt)
+	binary.LittleEndian.PutUint32(tmp[:], uint32(len(key)))
+	b2.Write(tmp[:])
+	b2.Write(key)
+	binary.LittleEndian.PutUint32(tmp[:], uint32(len(data)))
+	b2.Write(tmp[:])
+	b2.Write(data)
+	b2.Sum(h0[:0])
+	return h0
+}
+
+func initBlocks(h0 *[blake2b.Size + 8]byte, memory, threads uint32) []block {
+	var block0 [1024]byte
+	B := make([]block, memory)
+	for lane := uint32(0); lane < threads; lane++ {
+		j := lane * (memory / threads)
+		binary.LittleEndian.PutUint32(h0[blake2b.Size+4:], lane)
+
+		binary.LittleEndian.PutUint32(h0[blake2b.Size:], 0)
+		blake2bHash(block0[:], h0[:])
+		for i := range B[j+0] {
+			B[j+0][i] = binary.LittleEndian.Uint64(block0[i*8:])
+		}
+
+		binary.LittleEndian.PutUint32(h0[blake2b.Size:], 1)
+		blake2bHash(block0[:], h0[:])
+		for i := range B[j+1] {
+			B[j+1][i] = binary.LittleEndian.Uint64(block0[i*8:])
+		}
+	}
+	return B
+}
+
+func processBlocks(B []block, time, memory, threads uint32, mode int) {
+	lanes := memory / threads
+	segments := lanes / syncPoints
+
+	processSegment := func(n, slice, lane uint32, wg *sync.WaitGroup) {
+		var addresses, in, zero block
+		if mode == argon2i || (mode == argon2id && n == 0 && slice < syncPoints/2) {
+			in[0] = uint64(n)
+			in[1] = uint64(lane)
+			in[2] = uint64(slice)
+			in[3] = uint64(memory)
+			in[4] = uint64(time)
+			in[5] = uint64(mode)
+		}
+
+		index := uint32(0)
+		if n == 0 && slice == 0 {
+			index = 2 // we have already generated the first two blocks
+			if mode == argon2i || mode == argon2id {
+				in[6]++
+				processBlock(&addresses, &in, &zero)
+				processBlock(&addresses, &addresses, &zero)
+			}
+		}
+
+		offset := lane*lanes + slice*segments + index
+		var random uint64
+		for index < segments {
+			prev := offset - 1
+			if index == 0 && slice == 0 {
+				prev += lanes // last block in lane
+			}
+			if mode == argon2i || (mode == argon2id && n == 0 && slice < syncPoints/2) {
+				if index%blockLength == 0 {
+					in[6]++
+					processBlock(&addresses, &in, &zero)
+					processBlock(&addresses, &addresses, &zero)
+				}
+				random = addresses[index%blockLength]
+			} else {
+				random = B[prev][0]
+			}
+			newOffset := indexAlpha(random, lanes, segments, threads, n, slice, lane, index)
+			processBlockXOR(&B[offset], &B[prev], &B[newOffset])
+			index, offset = index+1, offset+1
+		}
+		wg.Done()
+	}
+
+	for n := uint32(0); n < time; n++ {
+		for slice := uint32(0); slice < syncPoints; slice++ {
+			var wg sync.WaitGroup
+			for lane := uint32(0); lane < threads; lane++ {
+				wg.Add(1)
+				go processSegment(n, slice, lane, &wg)
+			}
+			wg.Wait()
+		}
+	}
+
+}
+
+func extractKey(B []block, memory, threads, keyLen uint32) []byte {
+	lanes := memory / threads
+	for lane := uint32(0); lane < threads-1; lane++ {
+		for i, v := range B[(lane*lanes)+lanes-1] {
+			B[memory-1][i] ^= v
+		}
+	}
+
+	var block [1024]byte
+	for i, v := range B[memory-1] {
+		binary.LittleEndian.PutUint64(block[i*8:], v)
+	}
+	key := make([]byte, keyLen)
+	blake2bHash(key, block[:])
+	return key
+}
+
+func indexAlpha(rand uint64, lanes, segments, threads, n, slice, lane, index uint32) uint32 {
+	refLane := uint32(rand>>32) % threads
+	if n == 0 && slice == 0 {
+		refLane = lane
+	}
+	m, s := 3*segments, ((slice+1)%syncPoints)*segments
+	if lane == refLane {
+		m += index
+	}
+	if n == 0 {
+		m, s = slice*segments, 0
+		if slice == 0 || lane == refLane {
+			m += index
+		}
+	}
+	if index == 0 || lane == refLane {
+		m--
+	}
+	return phi(rand, uint64(m), uint64(s), refLane, lanes)
+}
+
+func phi(rand, m, s uint64, lane, lanes uint32) uint32 {
+	p := rand & 0xFFFFFFFF
+	p = (p * p) >> 32
+	p = (p * m) >> 32
+	return lane*lanes + uint32((s+m-(p+1))%uint64(lanes))
+}
diff --git a/vendor/golang.org/x/crypto/argon2/argon2_test.go b/vendor/golang.org/x/crypto/argon2/argon2_test.go
new file mode 100644
index 000000000..775b97a40
--- /dev/null
+++ b/vendor/golang.org/x/crypto/argon2/argon2_test.go
@@ -0,0 +1,233 @@
+// Copyright 2017 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.
+
+package argon2
+
+import (
+	"bytes"
+	"encoding/hex"
+	"testing"
+)
+
+var (
+	genKatPassword = []byte{
+		0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+		0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+		0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+		0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+	}
+	genKatSalt   = []byte{0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02}
+	genKatSecret = []byte{0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03}
+	genKatAAD    = []byte{0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04}
+)
+
+func TestArgon2(t *testing.T) {
+	defer func(sse4 bool) { useSSE4 = sse4 }(useSSE4)
+
+	if useSSE4 {
+		t.Log("SSE4.1 version")
+		testArgon2i(t)
+		testArgon2d(t)
+		testArgon2id(t)
+		useSSE4 = false
+	}
+	t.Log("generic version")
+	testArgon2i(t)
+	testArgon2d(t)
+	testArgon2id(t)
+}
+
+func testArgon2d(t *testing.T) {
+	want := []byte{
+		0x51, 0x2b, 0x39, 0x1b, 0x6f, 0x11, 0x62, 0x97,
+		0x53, 0x71, 0xd3, 0x09, 0x19, 0x73, 0x42, 0x94,
+		0xf8, 0x68, 0xe3, 0xbe, 0x39, 0x84, 0xf3, 0xc1,
+		0xa1, 0x3a, 0x4d, 0xb9, 0xfa, 0xbe, 0x4a, 0xcb,
+	}
+	hash := deriveKey(argon2d, genKatPassword, genKatSalt, genKatSecret, genKatAAD, 3, 32, 4, 32)
+	if !bytes.Equal(hash, want) {
+		t.Errorf("derived key does not match - got: %s , want: %s", hex.EncodeToString(hash), hex.EncodeToString(want))
+	}
+}
+
+func testArgon2i(t *testing.T) {
+	want := []byte{
+		0xc8, 0x14, 0xd9, 0xd1, 0xdc, 0x7f, 0x37, 0xaa,
+		0x13, 0xf0, 0xd7, 0x7f, 0x24, 0x94, 0xbd, 0xa1,
+		0xc8, 0xde, 0x6b, 0x01, 0x6d, 0xd3, 0x88, 0xd2,
+		0x99, 0x52, 0xa4, 0xc4, 0x67, 0x2b, 0x6c, 0xe8,
+	}
+	hash := deriveKey(argon2i, genKatPassword, genKatSalt, genKatSecret, genKatAAD, 3, 32, 4, 32)
+	if !bytes.Equal(hash, want) {
+		t.Errorf("derived key does not match - got: %s , want: %s", hex.EncodeToString(hash), hex.EncodeToString(want))
+	}
+}
+
+func testArgon2id(t *testing.T) {
+	want := []byte{
+		0x0d, 0x64, 0x0d, 0xf5, 0x8d, 0x78, 0x76, 0x6c,
+		0x08, 0xc0, 0x37, 0xa3, 0x4a, 0x8b, 0x53, 0xc9,
+		0xd0, 0x1e, 0xf0, 0x45, 0x2d, 0x75, 0xb6, 0x5e,
+		0xb5, 0x25, 0x20, 0xe9, 0x6b, 0x01, 0xe6, 0x59,
+	}
+	hash := deriveKey(argon2id, genKatPassword, genKatSalt, genKatSecret, genKatAAD, 3, 32, 4, 32)
+	if !bytes.Equal(hash, want) {
+		t.Errorf("derived key does not match - got: %s , want: %s", hex.EncodeToString(hash), hex.EncodeToString(want))
+	}
+}
+
+func TestVectors(t *testing.T) {
+	password, salt := []byte("password"), []byte("somesalt")
+	for i, v := range testVectors {
+		want, err := hex.DecodeString(v.hash)
+		if err != nil {
+			t.Fatalf("Test %d: failed to decode hash: %v", i, err)
+		}
+		hash := deriveKey(v.mode, password, salt, nil, nil, v.time, v.memory, v.threads, uint32(len(want)))
+		if !bytes.Equal(hash, want) {
+			t.Errorf("Test %d - got: %s want: %s", i, hex.EncodeToString(hash), hex.EncodeToString(want))
+		}
+	}
+}
+
+func benchmarkArgon2(mode int, time, memory uint32, threads uint8, keyLen uint32, b *testing.B) {
+	password := []byte("password")
+	salt := []byte("choosing random salts is hard")
+	b.ReportAllocs()
+	for i := 0; i < b.N; i++ {
+		deriveKey(mode, password, salt, nil, nil, time, memory, threads, keyLen)
+	}
+}
+
+func BenchmarkArgon2i(b *testing.B) {
+	b.Run(" Time: 3 Memory: 32 MB, Threads: 1", func(b *testing.B) { benchmarkArgon2(argon2i, 3, 32*1024, 1, 32, b) })
+	b.Run(" Time: 4 Memory: 32 MB, Threads: 1", func(b *testing.B) { benchmarkArgon2(argon2i, 4, 32*1024, 1, 32, b) })
+	b.Run(" Time: 5 Memory: 32 MB, Threads: 1", func(b *testing.B) { benchmarkArgon2(argon2i, 5, 32*1024, 1, 32, b) })
+	b.Run(" Time: 3 Memory: 64 MB, Threads: 4", func(b *testing.B) { benchmarkArgon2(argon2i, 3, 64*1024, 4, 32, b) })
+	b.Run(" Time: 4 Memory: 64 MB, Threads: 4", func(b *testing.B) { benchmarkArgon2(argon2i, 4, 64*1024, 4, 32, b) })
+	b.Run(" Time: 5 Memory: 64 MB, Threads: 4", func(b *testing.B) { benchmarkArgon2(argon2i, 5, 64*1024, 4, 32, b) })
+}
+
+func BenchmarkArgon2d(b *testing.B) {
+	b.Run(" Time: 3, Memory: 32 MB, Threads: 1", func(b *testing.B) { benchmarkArgon2(argon2d, 3, 32*1024, 1, 32, b) })
+	b.Run(" Time: 4, Memory: 32 MB, Threads: 1", func(b *testing.B) { benchmarkArgon2(argon2d, 4, 32*1024, 1, 32, b) })
+	b.Run(" Time: 5, Memory: 32 MB, Threads: 1", func(b *testing.B) { benchmarkArgon2(argon2d, 5, 32*1024, 1, 32, b) })
+	b.Run(" Time: 3, Memory: 64 MB, Threads: 4", func(b *testing.B) { benchmarkArgon2(argon2d, 3, 64*1024, 4, 32, b) })
+	b.Run(" Time: 4, Memory: 64 MB, Threads: 4", func(b *testing.B) { benchmarkArgon2(argon2d, 4, 64*1024, 4, 32, b) })
+	b.Run(" Time: 5, Memory: 64 MB, Threads: 4", func(b *testing.B) { benchmarkArgon2(argon2d, 5, 64*1024, 4, 32, b) })
+}
+
+func BenchmarkArgon2id(b *testing.B) {
+	b.Run(" Time: 3, Memory: 32 MB, Threads: 1", func(b *testing.B) { benchmarkArgon2(argon2id, 3, 32*1024, 1, 32, b) })
+	b.Run(" Time: 4, Memory: 32 MB, Threads: 1", func(b *testing.B) { benchmarkArgon2(argon2id, 4, 32*1024, 1, 32, b) })
+	b.Run(" Time: 5, Memory: 32 MB, Threads: 1", func(b *testing.B) { benchmarkArgon2(argon2id, 5, 32*1024, 1, 32, b) })
+	b.Run(" Time: 3, Memory: 64 MB, Threads: 4", func(b *testing.B) { benchmarkArgon2(argon2id, 3, 64*1024, 4, 32, b) })
+	b.Run(" Time: 4, Memory: 64 MB, Threads: 4", func(b *testing.B) { benchmarkArgon2(argon2id, 4, 64*1024, 4, 32, b) })
+	b.Run(" Time: 5, Memory: 64 MB, Threads: 4", func(b *testing.B) { benchmarkArgon2(argon2id, 5, 64*1024, 4, 32, b) })
+}
+
+// Generated with the CLI of https://github.com/P-H-C/phc-winner-argon2/blob/master/argon2-specs.pdf
+var testVectors = []struct {
+	mode         int
+	time, memory uint32
+	threads      uint8
+	hash         string
+}{
+	{
+		mode: argon2i, time: 1, memory: 64, threads: 1,
+		hash: "b9c401d1844a67d50eae3967dc28870b22e508092e861a37",
+	},
+	{
+		mode: argon2d, time: 1, memory: 64, threads: 1,
+		hash: "8727405fd07c32c78d64f547f24150d3f2e703a89f981a19",
+	},
+	{
+		mode: argon2id, time: 1, memory: 64, threads: 1,
+		hash: "655ad15eac652dc59f7170a7332bf49b8469be1fdb9c28bb",
+	},
+	{
+		mode: argon2i, time: 2, memory: 64, threads: 1,
+		hash: "8cf3d8f76a6617afe35fac48eb0b7433a9a670ca4a07ed64",
+	},
+	{
+		mode: argon2d, time: 2, memory: 64, threads: 1,
+		hash: "3be9ec79a69b75d3752acb59a1fbb8b295a46529c48fbb75",
+	},
+	{
+		mode: argon2id, time: 2, memory: 64, threads: 1,
+		hash: "068d62b26455936aa6ebe60060b0a65870dbfa3ddf8d41f7",
+	},
+	{
+		mode: argon2i, time: 2, memory: 64, threads: 2,
+		hash: "2089f3e78a799720f80af806553128f29b132cafe40d059f",
+	},
+	{
+		mode: argon2d, time: 2, memory: 64, threads: 2,
+		hash: "68e2462c98b8bc6bb60ec68db418ae2c9ed24fc6748a40e9",
+	},
+	{
+		mode: argon2id, time: 2, memory: 64, threads: 2,
+		hash: "350ac37222f436ccb5c0972f1ebd3bf6b958bf2071841362",
+	},
+	{
+		mode: argon2i, time: 3, memory: 256, threads: 2,
+		hash: "f5bbf5d4c3836af13193053155b73ec7476a6a2eb93fd5e6",
+	},
+	{
+		mode: argon2d, time: 3, memory: 256, threads: 2,
+		hash: "f4f0669218eaf3641f39cc97efb915721102f4b128211ef2",
+	},
+	{
+		mode: argon2id, time: 3, memory: 256, threads: 2,
+		hash: "4668d30ac4187e6878eedeacf0fd83c5a0a30db2cc16ef0b",
+	},
+	{
+		mode: argon2i, time: 4, memory: 4096, threads: 4,
+		hash: "a11f7b7f3f93f02ad4bddb59ab62d121e278369288a0d0e7",
+	},
+	{
+		mode: argon2d, time: 4, memory: 4096, threads: 4,
+		hash: "935598181aa8dc2b720914aa6435ac8d3e3a4210c5b0fb2d",
+	},
+	{
+		mode: argon2id, time: 4, memory: 4096, threads: 4,
+		hash: "145db9733a9f4ee43edf33c509be96b934d505a4efb33c5a",
+	},
+	{
+		mode: argon2i, time: 4, memory: 1024, threads: 8,
+		hash: "0cdd3956aa35e6b475a7b0c63488822f774f15b43f6e6e17",
+	},
+	{
+		mode: argon2d, time: 4, memory: 1024, threads: 8,
+		hash: "83604fc2ad0589b9d055578f4d3cc55bc616df3578a896e9",
+	},
+	{
+		mode: argon2id, time: 4, memory: 1024, threads: 8,
+		hash: "8dafa8e004f8ea96bf7c0f93eecf67a6047476143d15577f",
+	},
+	{
+		mode: argon2i, time: 2, memory: 64, threads: 3,
+		hash: "5cab452fe6b8479c8661def8cd703b611a3905a6d5477fe6",
+	},
+	{
+		mode: argon2d, time: 2, memory: 64, threads: 3,
+		hash: "22474a423bda2ccd36ec9afd5119e5c8949798cadf659f51",
+	},
+	{
+		mode: argon2id, time: 2, memory: 64, threads: 3,
+		hash: "4a15b31aec7c2590b87d1f520be7d96f56658172deaa3079",
+	},
+	{
+		mode: argon2i, time: 3, memory: 1024, threads: 6,
+		hash: "d236b29c2b2a09babee842b0dec6aa1e83ccbdea8023dced",
+	},
+	{
+		mode: argon2d, time: 3, memory: 1024, threads: 6,
+		hash: "a3351b0319a53229152023d9206902f4ef59661cdca89481",
+	},
+	{
+		mode: argon2id, time: 3, memory: 1024, threads: 6,
+		hash: "1640b932f4b60e272f5d2207b9a9c626ffa1bd88d2349016",
+	},
+}
diff --git a/vendor/golang.org/x/crypto/argon2/blake2b.go b/vendor/golang.org/x/crypto/argon2/blake2b.go
new file mode 100644
index 000000000..10f46948d
--- /dev/null
+++ b/vendor/golang.org/x/crypto/argon2/blake2b.go
@@ -0,0 +1,53 @@
+// Copyright 2017 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.
+
+package argon2
+
+import (
+	"encoding/binary"
+	"hash"
+
+	"golang.org/x/crypto/blake2b"
+)
+
+// blake2bHash computes an arbitrary long hash value of in
+// and writes the hash to out.
+func blake2bHash(out []byte, in []byte) {
+	var b2 hash.Hash
+	if n := len(out); n < blake2b.Size {
+		b2, _ = blake2b.New(n, nil)
+	} else {
+		b2, _ = blake2b.New512(nil)
+	}
+
+	var buffer [blake2b.Size]byte
+	binary.LittleEndian.PutUint32(buffer[:4], uint32(len(out)))
+	b2.Write(buffer[:4])
+	b2.Write(in)
+
+	if len(out) <= blake2b.Size {
+		b2.Sum(out[:0])
+		return
+	}
+
+	outLen := len(out)
+	b2.Sum(buffer[:0])
+	b2.Reset()
+	copy(out, buffer[:32])
+	out = out[32:]
+	for len(out) > blake2b.Size {
+		b2.Write(buffer[:])
+		b2.Sum(buffer[:0])
+		copy(out, buffer[:32])
+		out = out[32:]
+		b2.Reset()
+	}
+
+	if outLen%blake2b.Size > 0 { // outLen > 64
+		r := ((outLen + 31) / 32) - 2 // ⌈τ /32⌉-2
+		b2, _ = blake2b.New(outLen-32*r, nil)
+	}
+	b2.Write(buffer[:])
+	b2.Sum(out[:0])
+}
diff --git a/vendor/golang.org/x/crypto/argon2/blamka_amd64.go b/vendor/golang.org/x/crypto/argon2/blamka_amd64.go
new file mode 100644
index 000000000..583ac4be2
--- /dev/null
+++ b/vendor/golang.org/x/crypto/argon2/blamka_amd64.go
@@ -0,0 +1,59 @@
+// Copyright 2017 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.
+
+package argon2
+
+func init() {
+	useSSE4 = supportsSSE4()
+}
+
+//go:noescape
+func supportsSSE4() bool
+
+//go:noescape
+func mixBlocksSSE2(out, a, b, c *block)
+
+//go:noescape
+func xorBlocksSSE2(out, a, b, c *block)
+
+//go:noescape
+func blamkaSSE4(b *block)
+
+func processBlockSSE(out, in1, in2 *block, xor bool) {
+	var t block
+	mixBlocksSSE2(&t, in1, in2, &t)
+	if useSSE4 {
+		blamkaSSE4(&t)
+	} else {
+		for i := 0; i < blockLength; i += 16 {
+			blamkaGeneric(
+				&t[i+0], &t[i+1], &t[i+2], &t[i+3],
+				&t[i+4], &t[i+5], &t[i+6], &t[i+7],
+				&t[i+8], &t[i+9], &t[i+10], &t[i+11],
+				&t[i+12], &t[i+13], &t[i+14], &t[i+15],
+			)
+		}
+		for i := 0; i < blockLength/8; i += 2 {
+			blamkaGeneric(
+				&t[i], &t[i+1], &t[16+i], &t[16+i+1],
+				&t[32+i], &t[32+i+1], &t[48+i], &t[48+i+1],
+				&t[64+i], &t[64+i+1], &t[80+i], &t[80+i+1],
+				&t[96+i], &t[96+i+1], &t[112+i], &t[112+i+1],
+			)
+		}
+	}
+	if xor {
+		xorBlocksSSE2(out, in1, in2, &t)
+	} else {
+		mixBlocksSSE2(out, in1, in2, &t)
+	}
+}
+
+func processBlock(out, in1, in2 *block) {
+	processBlockSSE(out, in1, in2, false)
+}
+
+func processBlockXOR(out, in1, in2 *block) {
+	processBlockSSE(out, in1, in2, true)
+}
diff --git a/vendor/golang.org/x/crypto/argon2/blamka_amd64.s b/vendor/golang.org/x/crypto/argon2/blamka_amd64.s
new file mode 100644
index 000000000..8a83f7c73
--- /dev/null
+++ b/vendor/golang.org/x/crypto/argon2/blamka_amd64.s
@@ -0,0 +1,252 @@
+// Copyright 2017 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.
+
+// +build amd64,!gccgo,!appengine
+
+#include "textflag.h"
+
+DATA ·c40<>+0x00(SB)/8, $0x0201000706050403
+DATA ·c40<>+0x08(SB)/8, $0x0a09080f0e0d0c0b
+GLOBL ·c40<>(SB), (NOPTR+RODATA), $16
+
+DATA ·c48<>+0x00(SB)/8, $0x0100070605040302
+DATA ·c48<>+0x08(SB)/8, $0x09080f0e0d0c0b0a
+GLOBL ·c48<>(SB), (NOPTR+RODATA), $16
+
+#define SHUFFLE(v2, v3, v4, v5, v6, v7, t1, t2) \
+	MOVO       v4, t1; \
+	MOVO       v5, v4; \
+	MOVO       t1, v5; \
+	MOVO       v6, t1; \
+	PUNPCKLQDQ v6, t2; \
+	PUNPCKHQDQ v7, v6; \
+	PUNPCKHQDQ t2, v6; \
+	PUNPCKLQDQ v7, t2; \
+	MOVO       t1, v7; \
+	MOVO       v2, t1; \
+	PUNPCKHQDQ t2, v7; \
+	PUNPCKLQDQ v3, t2; \
+	PUNPCKHQDQ t2, v2; \
+	PUNPCKLQDQ t1, t2; \
+	PUNPCKHQDQ t2, v3
+
+#define SHUFFLE_INV(v2, v3, v4, v5, v6, v7, t1, t2) \
+	MOVO       v4, t1; \
+	MOVO       v5, v4; \
+	MOVO       t1, v5; \
+	MOVO       v2, t1; \
+	PUNPCKLQDQ v2, t2; \
+	PUNPCKHQDQ v3, v2; \
+	PUNPCKHQDQ t2, v2; \
+	PUNPCKLQDQ v3, t2; \
+	MOVO       t1, v3; \
+	MOVO       v6, t1; \
+	PUNPCKHQDQ t2, v3; \
+	PUNPCKLQDQ v7, t2; \
+	PUNPCKHQDQ t2, v6; \
+	PUNPCKLQDQ t1, t2; \
+	PUNPCKHQDQ t2, v7
+
+#define HALF_ROUND(v0, v1, v2, v3, v4, v5, v6, v7, t0, c40, c48) \
+	MOVO    v0, t0;        \
+	PMULULQ v2, t0;        \
+	PADDQ   v2, v0;        \
+	PADDQ   t0, v0;        \
+	PADDQ   t0, v0;        \
+	PXOR    v0, v6;        \
+	PSHUFD  $0xB1, v6, v6; \
+	MOVO    v4, t0;        \
+	PMULULQ v6, t0;        \
+	PADDQ   v6, v4;        \
+	PADDQ   t0, v4;        \
+	PADDQ   t0, v4;        \
+	PXOR    v4, v2;        \
+	PSHUFB  c40, v2;       \
+	MOVO    v0, t0;        \
+	PMULULQ v2, t0;        \
+	PADDQ   v2, v0;        \
+	PADDQ   t0, v0;        \
+	PADDQ   t0, v0;        \
+	PXOR    v0, v6;        \
+	PSHUFB  c48, v6;       \
+	MOVO    v4, t0;        \
+	PMULULQ v6, t0;        \
+	PADDQ   v6, v4;        \
+	PADDQ   t0, v4;        \
+	PADDQ   t0, v4;        \
+	PXOR    v4, v2;        \
+	MOVO    v2, t0;        \
+	PADDQ   v2, t0;        \
+	PSRLQ   $63, v2;       \
+	PXOR    t0, v2;        \
+	MOVO    v1, t0;        \
+	PMULULQ v3, t0;        \
+	PADDQ   v3, v1;        \
+	PADDQ   t0, v1;        \
+	PADDQ   t0, v1;        \
+	PXOR    v1, v7;        \
+	PSHUFD  $0xB1, v7, v7; \
+	MOVO    v5, t0;        \
+	PMULULQ v7, t0;        \
+	PADDQ   v7, v5;        \
+	PADDQ   t0, v5;        \
+	PADDQ   t0, v5;        \
+	PXOR    v5, v3;        \
+	PSHUFB  c40, v3;       \
+	MOVO    v1, t0;        \
+	PMULULQ v3, t0;        \
+	PADDQ   v3, v1;        \
+	PADDQ   t0, v1;        \
+	PADDQ   t0, v1;        \
+	PXOR    v1, v7;        \
+	PSHUFB  c48, v7;       \
+	MOVO    v5, t0;        \
+	PMULULQ v7, t0;        \
+	PADDQ   v7, v5;        \
+	PADDQ   t0, v5;        \
+	PADDQ   t0, v5;        \
+	PXOR    v5, v3;        \
+	MOVO    v3, t0;        \
+	PADDQ   v3, t0;        \
+	PSRLQ   $63, v3;       \
+	PXOR    t0, v3
+
+#define LOAD_MSG_0(block, off) \
+	MOVOU 8*(off+0)(block), X0;  \
+	MOVOU 8*(off+2)(block), X1;  \
+	MOVOU 8*(off+4)(block), X2;  \
+	MOVOU 8*(off+6)(block), X3;  \
+	MOVOU 8*(off+8)(block), X4;  \
+	MOVOU 8*(off+10)(block), X5; \
+	MOVOU 8*(off+12)(block), X6; \
+	MOVOU 8*(off+14)(block), X7
+
+#define STORE_MSG_0(block, off) \
+	MOVOU X0, 8*(off+0)(block);  \
+	MOVOU X1, 8*(off+2)(block);  \
+	MOVOU X2, 8*(off+4)(block);  \
+	MOVOU X3, 8*(off+6)(block);  \
+	MOVOU X4, 8*(off+8)(block);  \
+	MOVOU X5, 8*(off+10)(block); \
+	MOVOU X6, 8*(off+12)(block); \
+	MOVOU X7, 8*(off+14)(block)
+
+#define LOAD_MSG_1(block, off) \
+	MOVOU 8*off+0*8(block), X0;  \
+	MOVOU 8*off+16*8(block), X1; \
+	MOVOU 8*off+32*8(block), X2; \
+	MOVOU 8*off+48*8(block), X3; \
+	MOVOU 8*off+64*8(block), X4; \
+	MOVOU 8*off+80*8(block), X5; \
+	MOVOU 8*off+96*8(block), X6; \
+	MOVOU 8*off+112*8(block), X7
+
+#define STORE_MSG_1(block, off) \
+	MOVOU X0, 8*off+0*8(block);  \
+	MOVOU X1, 8*off+16*8(block); \
+	MOVOU X2, 8*off+32*8(block); \
+	MOVOU X3, 8*off+48*8(block); \
+	MOVOU X4, 8*off+64*8(block); \
+	MOVOU X5, 8*off+80*8(block); \
+	MOVOU X6, 8*off+96*8(block); \
+	MOVOU X7, 8*off+112*8(block)
+
+#define BLAMKA_ROUND_0(block, off, t0, t1, c40, c48) \
+	LOAD_MSG_0(block, off);                                   \
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, t0, c40, c48); \
+	SHUFFLE(X2, X3, X4, X5, X6, X7, t0, t1);                  \
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, t0, c40, c48); \
+	SHUFFLE_INV(X2, X3, X4, X5, X6, X7, t0, t1);              \
+	STORE_MSG_0(block, off)
+
+#define BLAMKA_ROUND_1(block, off, t0, t1, c40, c48) \
+	LOAD_MSG_1(block, off);                                   \
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, t0, c40, c48); \
+	SHUFFLE(X2, X3, X4, X5, X6, X7, t0, t1);                  \
+	HALF_ROUND(X0, X1, X2, X3, X4, X5, X6, X7, t0, c40, c48); \
+	SHUFFLE_INV(X2, X3, X4, X5, X6, X7, t0, t1);              \
+	STORE_MSG_1(block, off)
+
+// func blamkaSSE4(b *block)
+TEXT ·blamkaSSE4(SB), 4, $0-8
+	MOVQ b+0(FP), AX
+
+	MOVOU ·c40<>(SB), X10
+	MOVOU ·c48<>(SB), X11
+
+	BLAMKA_ROUND_0(AX, 0, X8, X9, X10, X11)
+	BLAMKA_ROUND_0(AX, 16, X8, X9, X10, X11)
+	BLAMKA_ROUND_0(AX, 32, X8, X9, X10, X11)
+	BLAMKA_ROUND_0(AX, 48, X8, X9, X10, X11)
+	BLAMKA_ROUND_0(AX, 64, X8, X9, X10, X11)
+	BLAMKA_ROUND_0(AX, 80, X8, X9, X10, X11)
+	BLAMKA_ROUND_0(AX, 96, X8, X9, X10, X11)
+	BLAMKA_ROUND_0(AX, 112, X8, X9, X10, X11)
+
+	BLAMKA_ROUND_1(AX, 0, X8, X9, X10, X11)
+	BLAMKA_ROUND_1(AX, 2, X8, X9, X10, X11)
+	BLAMKA_ROUND_1(AX, 4, X8, X9, X10, X11)
+	BLAMKA_ROUND_1(AX, 6, X8, X9, X10, X11)
+	BLAMKA_ROUND_1(AX, 8, X8, X9, X10, X11)
+	BLAMKA_ROUND_1(AX, 10, X8, X9, X10, X11)
+	BLAMKA_ROUND_1(AX, 12, X8, X9, X10, X11)
+	BLAMKA_ROUND_1(AX, 14, X8, X9, X10, X11)
+	RET
+
+// func mixBlocksSSE2(out, a, b, c *block)
+TEXT ·mixBlocksSSE2(SB), 4, $0-32
+	MOVQ out+0(FP), DX
+	MOVQ a+8(FP), AX
+	MOVQ b+16(FP), BX
+	MOVQ a+24(FP), CX
+	MOVQ $128, BP
+
+loop:
+	MOVOU 0(AX), X0
+	MOVOU 0(BX), X1
+	MOVOU 0(CX), X2
+	PXOR  X1, X0
+	PXOR  X2, X0
+	MOVOU X0, 0(DX)
+	ADDQ  $16, AX
+	ADDQ  $16, BX
+	ADDQ  $16, CX
+	ADDQ  $16, DX
+	SUBQ  $2, BP
+	JA    loop
+	RET
+
+// func xorBlocksSSE2(out, a, b, c *block)
+TEXT ·xorBlocksSSE2(SB), 4, $0-32
+	MOVQ out+0(FP), DX
+	MOVQ a+8(FP), AX
+	MOVQ b+16(FP), BX
+	MOVQ a+24(FP), CX
+	MOVQ $128, BP
+
+loop:
+	MOVOU 0(AX), X0
+	MOVOU 0(BX), X1
+	MOVOU 0(CX), X2
+	MOVOU 0(DX), X3
+	PXOR  X1, X0
+	PXOR  X2, X0
+	PXOR  X3, X0
+	MOVOU X0, 0(DX)
+	ADDQ  $16, AX
+	ADDQ  $16, BX
+	ADDQ  $16, CX
+	ADDQ  $16, DX
+	SUBQ  $2, BP
+	JA    loop
+	RET
+
+// func supportsSSE4() bool
+TEXT ·supportsSSE4(SB), 4, $0-1
+	MOVL $1, AX
+	CPUID
+	SHRL $19, CX       // Bit 19 indicates SSE4 support
+	ANDL $1, CX        // CX != 0 if support SSE4
+	MOVB CX, ret+0(FP)
+	RET
diff --git a/vendor/golang.org/x/crypto/argon2/blamka_generic.go b/vendor/golang.org/x/crypto/argon2/blamka_generic.go
new file mode 100644
index 000000000..a481b2243
--- /dev/null
+++ b/vendor/golang.org/x/crypto/argon2/blamka_generic.go
@@ -0,0 +1,163 @@
+// Copyright 2017 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.
+
+package argon2
+
+var useSSE4 bool
+
+func processBlockGeneric(out, in1, in2 *block, xor bool) {
+	var t block
+	for i := range t {
+		t[i] = in1[i] ^ in2[i]
+	}
+	for i := 0; i < blockLength; i += 16 {
+		blamkaGeneric(
+			&t[i+0], &t[i+1], &t[i+2], &t[i+3],
+			&t[i+4], &t[i+5], &t[i+6], &t[i+7],
+			&t[i+8], &t[i+9], &t[i+10], &t[i+11],
+			&t[i+12], &t[i+13], &t[i+14], &t[i+15],
+		)
+	}
+	for i := 0; i < blockLength/8; i += 2 {
+		blamkaGeneric(
+			&t[i], &t[i+1], &t[16+i], &t[16+i+1],
+			&t[32+i], &t[32+i+1], &t[48+i], &t[48+i+1],
+			&t[64+i], &t[64+i+1], &t[80+i], &t[80+i+1],
+			&t[96+i], &t[96+i+1], &t[112+i], &t[112+i+1],
+		)
+	}
+	if xor {
+		for i := range t {
+			out[i] ^= in1[i] ^ in2[i] ^ t[i]
+		}
+	} else {
+		for i := range t {
+			out[i] = in1[i] ^ in2[i] ^ t[i]
+		}
+	}
+}
+
+func blamkaGeneric(t00, t01, t02, t03, t04, t05, t06, t07, t08, t09, t10, t11, t12, t13, t14, t15 *uint64) {
+	v00, v01, v02, v03 := *t00, *t01, *t02, *t03
+	v04, v05, v06, v07 := *t04, *t05, *t06, *t07
+	v08, v09, v10, v11 := *t08, *t09, *t10, *t11
+	v12, v13, v14, v15 := *t12, *t13, *t14, *t15
+
+	v00 += v04 + 2*uint64(uint32(v00))*uint64(uint32(v04))
+	v12 ^= v00
+	v12 = v12>>32 | v12<<32
+	v08 += v12 + 2*uint64(uint32(v08))*uint64(uint32(v12))
+	v04 ^= v08
+	v04 = v04>>24 | v04<<40
+
+	v00 += v04 + 2*uint64(uint32(v00))*uint64(uint32(v04))
+	v12 ^= v00
+	v12 = v12>>16 | v12<<48
+	v08 += v12 + 2*uint64(uint32(v08))*uint64(uint32(v12))
+	v04 ^= v08
+	v04 = v04>>63 | v04<<1
+
+	v01 += v05 + 2*uint64(uint32(v01))*uint64(uint32(v05))
+	v13 ^= v01
+	v13 = v13>>32 | v13<<32
+	v09 += v13 + 2*uint64(uint32(v09))*uint64(uint32(v13))
+	v05 ^= v09
+	v05 = v05>>24 | v05<<40
+
+	v01 += v05 + 2*uint64(uint32(v01))*uint64(uint32(v05))
+	v13 ^= v01
+	v13 = v13>>16 | v13<<48
+	v09 += v13 + 2*uint64(uint32(v09))*uint64(uint32(v13))
+	v05 ^= v09
+	v05 = v05>>63 | v05<<1
+
+	v02 += v06 + 2*uint64(uint32(v02))*uint64(uint32(v06))
+	v14 ^= v02
+	v14 = v14>>32 | v14<<32
+	v10 += v14 + 2*uint64(uint32(v10))*uint64(uint32(v14))
+	v06 ^= v10
+	v06 = v06>>24 | v06<<40
+
+	v02 += v06 + 2*uint64(uint32(v02))*uint64(uint32(v06))
+	v14 ^= v02
+	v14 = v14>>16 | v14<<48
+	v10 += v14 + 2*uint64(uint32(v10))*uint64(uint32(v14))
+	v06 ^= v10
+	v06 = v06>>63 | v06<<1
+
+	v03 += v07 + 2*uint64(uint32(v03))*uint64(uint32(v07))
+	v15 ^= v03
+	v15 = v15>>32 | v15<<32
+	v11 += v15 + 2*uint64(uint32(v11))*uint64(uint32(v15))
+	v07 ^= v11
+	v07 = v07>>24 | v07<<40
+
+	v03 += v07 + 2*uint64(uint32(v03))*uint64(uint32(v07))
+	v15 ^= v03
+	v15 = v15>>16 | v15<<48
+	v11 += v15 + 2*uint64(uint32(v11))*uint64(uint32(v15))
+	v07 ^= v11
+	v07 = v07>>63 | v07<<1
+
+	v00 += v05 + 2*uint64(uint32(v00))*uint64(uint32(v05))
+	v15 ^= v00
+	v15 = v15>>32 | v15<<32
+	v10 += v15 + 2*uint64(uint32(v10))*uint64(uint32(v15))
+	v05 ^= v10
+	v05 = v05>>24 | v05<<40
+
+	v00 += v05 + 2*uint64(uint32(v00))*uint64(uint32(v05))
+	v15 ^= v00
+	v15 = v15>>16 | v15<<48
+	v10 += v15 + 2*uint64(uint32(v10))*uint64(uint32(v15))
+	v05 ^= v10
+	v05 = v05>>63 | v05<<1
+
+	v01 += v06 + 2*uint64(uint32(v01))*uint64(uint32(v06))
+	v12 ^= v01
+	v12 = v12>>32 | v12<<32
+	v11 += v12 + 2*uint64(uint32(v11))*uint64(uint32(v12))
+	v06 ^= v11
+	v06 = v06>>24 | v06<<40
+
+	v01 += v06 + 2*uint64(uint32(v01))*uint64(uint32(v06))
+	v12 ^= v01
+	v12 = v12>>16 | v12<<48
+	v11 += v12 + 2*uint64(uint32(v11))*uint64(uint32(v12))
+	v06 ^= v11
+	v06 = v06>>63 | v06<<1
+
+	v02 += v07 + 2*uint64(uint32(v02))*uint64(uint32(v07))
+	v13 ^= v02
+	v13 = v13>>32 | v13<<32
+	v08 += v13 + 2*uint64(uint32(v08))*uint64(uint32(v13))
+	v07 ^= v08
+	v07 = v07>>24 | v07<<40
+
+	v02 += v07 + 2*uint64(uint32(v02))*uint64(uint32(v07))
+	v13 ^= v02
+	v13 = v13>>16 | v13<<48
+	v08 += v13 + 2*uint64(uint32(v08))*uint64(uint32(v13))
+	v07 ^= v08
+	v07 = v07>>63 | v07<<1
+
+	v03 += v04 + 2*uint64(uint32(v03))*uint64(uint32(v04))
+	v14 ^= v03
+	v14 = v14>>32 | v14<<32
+	v09 += v14 + 2*uint64(uint32(v09))*uint64(uint32(v14))
+	v04 ^= v09
+	v04 = v04>>24 | v04<<40
+
+	v03 += v04 + 2*uint64(uint32(v03))*uint64(uint32(v04))
+	v14 ^= v03
+	v14 = v14>>16 | v14<<48
+	v09 += v14 + 2*uint64(uint32(v09))*uint64(uint32(v14))
+	v04 ^= v09
+	v04 = v04>>63 | v04<<1
+
+	*t00, *t01, *t02, *t03 = v00, v01, v02, v03
+	*t04, *t05, *t06, *t07 = v04, v05, v06, v07
+	*t08, *t09, *t10, *t11 = v08, v09, v10, v11
+	*t12, *t13, *t14, *t15 = v12, v13, v14, v15
+}
diff --git a/vendor/golang.org/x/crypto/argon2/blamka_ref.go b/vendor/golang.org/x/crypto/argon2/blamka_ref.go
new file mode 100644
index 000000000..baf7b551d
--- /dev/null
+++ b/vendor/golang.org/x/crypto/argon2/blamka_ref.go
@@ -0,0 +1,15 @@
+// Copyright 2017 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.
+
+// +build !amd64 appengine gccgo
+
+package argon2
+
+func processBlock(out, in1, in2 *block) {
+	processBlockGeneric(out, in1, in2, false)
+}
+
+func processBlockXOR(out, in1, in2 *block) {
+	processBlockGeneric(out, in1, in2, true)
+}
diff --git a/vendor/golang.org/x/crypto/bcrypt/bcrypt.go b/vendor/golang.org/x/crypto/bcrypt/bcrypt.go
index 202fa8aff..aeb73f81a 100644
--- a/vendor/golang.org/x/crypto/bcrypt/bcrypt.go
+++ b/vendor/golang.org/x/crypto/bcrypt/bcrypt.go
@@ -241,11 +241,11 @@ func (p *hashed) Hash() []byte {
 		n = 3
 	}
 	arr[n] = '$'
-	n += 1
+	n++
 	copy(arr[n:], []byte(fmt.Sprintf("%02d", p.cost)))
 	n += 2
 	arr[n] = '$'
-	n += 1
+	n++
 	copy(arr[n:], p.salt)
 	n += encodedSaltSize
 	copy(arr[n:], p.hash)
diff --git a/vendor/golang.org/x/crypto/blake2b/blake2b.go b/vendor/golang.org/x/crypto/blake2b/blake2b.go
index 7f0a86e44..6dedb8946 100644
--- a/vendor/golang.org/x/crypto/blake2b/blake2b.go
+++ b/vendor/golang.org/x/crypto/blake2b/blake2b.go
@@ -39,7 +39,10 @@ var (
 	useSSE4 bool
 )
 
-var errKeySize = errors.New("blake2b: invalid key size")
+var (
+	errKeySize  = errors.New("blake2b: invalid key size")
+	errHashSize = errors.New("blake2b: invalid hash size")
+)
 
 var iv = [8]uint64{
 	0x6a09e667f3bcc908, 0xbb67ae8584caa73b, 0x3c6ef372fe94f82b, 0xa54ff53a5f1d36f1,
@@ -83,7 +86,18 @@ func New384(key []byte) (hash.Hash, error) { return newDigest(Size384, key) }
 // key turns the hash into a MAC. The key must between zero and 64 bytes long.
 func New256(key []byte) (hash.Hash, error) { return newDigest(Size256, key) }
 
+// New returns a new hash.Hash computing the BLAKE2b checksum with a custom length.
+// A non-nil key turns the hash into a MAC. The key must between zero and 64 bytes long.
+// The hash size can be a value between 1 and 64 but it is highly recommended to use
+// values equal or greater than:
+// - 32 if BLAKE2b is used as a hash function (The key is zero bytes long).
+// - 16 if BLAKE2b is used as a MAC function (The key is at least 16 bytes long).
+func New(size int, key []byte) (hash.Hash, error) { return newDigest(size, key) }
+
 func newDigest(hashSize int, key []byte) (*digest, error) {
+	if hashSize < 1 || hashSize > Size {
+		return nil, errHashSize
+	}
 	if len(key) > Size {
 		return nil, errKeySize
 	}
diff --git a/vendor/golang.org/x/crypto/bn256/bn256.go b/vendor/golang.org/x/crypto/bn256/bn256.go
index 014f8b355..f88f3fc3b 100644
--- a/vendor/golang.org/x/crypto/bn256/bn256.go
+++ b/vendor/golang.org/x/crypto/bn256/bn256.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Package bn256 implements a particular bilinear group at the 128-bit security level.
+// Package bn256 implements a particular bilinear group.
 //
 // Bilinear groups are the basis of many of the new cryptographic protocols
 // that have been proposed over the past decade. They consist of a triplet of
@@ -14,6 +14,10 @@
 // Barreto-Naehrig curve as described in
 // http://cryptojedi.org/papers/dclxvi-20100714.pdf. Its output is compatible
 // with the implementation described in that paper.
+//
+// (This package previously claimed to operate at a 128-bit security level.
+// However, recent improvements in attacks mean that is no longer true. See
+// https://moderncrypto.org/mail-archive/curves/2016/000740.html.)
 package bn256 // import "golang.org/x/crypto/bn256"
 
 import (
@@ -49,8 +53,8 @@ func RandomG1(r io.Reader) (*big.Int, *G1, error) {
 	return k, new(G1).ScalarBaseMult(k), nil
 }
 
-func (g *G1) String() string {
-	return "bn256.G1" + g.p.String()
+func (e *G1) String() string {
+	return "bn256.G1" + e.p.String()
 }
 
 // ScalarBaseMult sets e to g*k where g is the generator of the group and
@@ -92,11 +96,11 @@ func (e *G1) Neg(a *G1) *G1 {
 }
 
 // Marshal converts n to a byte slice.
-func (n *G1) Marshal() []byte {
-	n.p.MakeAffine(nil)
+func (e *G1) Marshal() []byte {
+	e.p.MakeAffine(nil)
 
-	xBytes := new(big.Int).Mod(n.p.x, p).Bytes()
-	yBytes := new(big.Int).Mod(n.p.y, p).Bytes()
+	xBytes := new(big.Int).Mod(e.p.x, p).Bytes()
+	yBytes := new(big.Int).Mod(e.p.y, p).Bytes()
 
 	// Each value is a 256-bit number.
 	const numBytes = 256 / 8
@@ -166,8 +170,8 @@ func RandomG2(r io.Reader) (*big.Int, *G2, error) {
 	return k, new(G2).ScalarBaseMult(k), nil
 }
 
-func (g *G2) String() string {
-	return "bn256.G2" + g.p.String()
+func (e *G2) String() string {
+	return "bn256.G2" + e.p.String()
 }
 
 // ScalarBaseMult sets e to g*k where g is the generator of the group and
diff --git a/vendor/golang.org/x/crypto/chacha20poly1305/chacha20poly1305_generic.go b/vendor/golang.org/x/crypto/chacha20poly1305/chacha20poly1305_generic.go
index f7e4bfb1c..4ac014f52 100644
--- a/vendor/golang.org/x/crypto/chacha20poly1305/chacha20poly1305_generic.go
+++ b/vendor/golang.org/x/crypto/chacha20poly1305/chacha20poly1305_generic.go
@@ -7,7 +7,7 @@ package chacha20poly1305
 import (
 	"encoding/binary"
 
-	"golang.org/x/crypto/chacha20poly1305/internal/chacha20"
+	"golang.org/x/crypto/internal/chacha20"
 	"golang.org/x/crypto/poly1305"
 )
 
diff --git a/vendor/golang.org/x/crypto/chacha20poly1305/internal/chacha20/chacha_generic.go b/vendor/golang.org/x/crypto/internal/chacha20/chacha_generic.go
index 0f8efdbaa..0f8efdbaa 100644
--- a/vendor/golang.org/x/crypto/chacha20poly1305/internal/chacha20/chacha_generic.go
+++ b/vendor/golang.org/x/crypto/internal/chacha20/chacha_generic.go
diff --git a/vendor/golang.org/x/crypto/chacha20poly1305/internal/chacha20/chacha_test.go b/vendor/golang.org/x/crypto/internal/chacha20/chacha_test.go
index b80d34cdd..b80d34cdd 100644
--- a/vendor/golang.org/x/crypto/chacha20poly1305/internal/chacha20/chacha_test.go
+++ b/vendor/golang.org/x/crypto/internal/chacha20/chacha_test.go
diff --git a/vendor/golang.org/x/crypto/nacl/auth/auth.go b/vendor/golang.org/x/crypto/nacl/auth/auth.go
index 0835d3bf9..ec1d6ebe4 100644
--- a/vendor/golang.org/x/crypto/nacl/auth/auth.go
+++ b/vendor/golang.org/x/crypto/nacl/auth/auth.go
@@ -47,7 +47,7 @@ func Sum(m []byte, key *[KeySize]byte) *[Size]byte {
 
 // Verify checks that digest is a valid authenticator of message m under the
 // given secret key. Verify does not leak timing information.
-func Verify(digest []byte, m []byte, key *[32]byte) bool {
+func Verify(digest []byte, m []byte, key *[KeySize]byte) bool {
 	if len(digest) != Size {
 		return false
 	}
diff --git a/vendor/golang.org/x/crypto/ocsp/ocsp.go b/vendor/golang.org/x/crypto/ocsp/ocsp.go
index 5e73146d7..589dfd35f 100644
--- a/vendor/golang.org/x/crypto/ocsp/ocsp.go
+++ b/vendor/golang.org/x/crypto/ocsp/ocsp.go
@@ -760,7 +760,7 @@ func CreateResponse(issuer, responderCert *x509.Certificate, template Response,
 	}
 	if template.Certificate != nil {
 		response.Certificates = []asn1.RawValue{
-			asn1.RawValue{FullBytes: template.Certificate.Raw},
+			{FullBytes: template.Certificate.Raw},
 		}
 	}
 	responseDER, err := asn1.Marshal(response)
diff --git a/vendor/golang.org/x/crypto/ocsp/ocsp_test.go b/vendor/golang.org/x/crypto/ocsp/ocsp_test.go
index 1fadfec4c..70b19764f 100644
--- a/vendor/golang.org/x/crypto/ocsp/ocsp_test.go
+++ b/vendor/golang.org/x/crypto/ocsp/ocsp_test.go
@@ -218,7 +218,7 @@ func TestOCSPResponse(t *testing.T) {
 
 	extensionBytes, _ := hex.DecodeString(ocspExtensionValueHex)
 	extensions := []pkix.Extension{
-		pkix.Extension{
+		{
 			Id:       ocspExtensionOID,
 			Critical: false,
 			Value:    extensionBytes,
diff --git a/vendor/golang.org/x/crypto/openpgp/keys.go b/vendor/golang.org/x/crypto/openpgp/keys.go
index 68b14c6ae..744e293fe 100644
--- a/vendor/golang.org/x/crypto/openpgp/keys.go
+++ b/vendor/golang.org/x/crypto/openpgp/keys.go
@@ -325,9 +325,8 @@ func ReadEntity(packets *packet.Reader) (*Entity, error) {
 		if e.PrivateKey, ok = p.(*packet.PrivateKey); !ok {
 			packets.Unread(p)
 			return nil, errors.StructuralError("first packet was not a public/private key")
-		} else {
-			e.PrimaryKey = &e.PrivateKey.PublicKey
 		}
+		e.PrimaryKey = &e.PrivateKey.PublicKey
 	}
 
 	if !e.PrimaryKey.PubKeyAlgo.CanSign() {
diff --git a/vendor/golang.org/x/crypto/pbkdf2/pbkdf2_test.go b/vendor/golang.org/x/crypto/pbkdf2/pbkdf2_test.go
index 137924061..f83cb6922 100644
--- a/vendor/golang.org/x/crypto/pbkdf2/pbkdf2_test.go
+++ b/vendor/golang.org/x/crypto/pbkdf2/pbkdf2_test.go
@@ -155,3 +155,22 @@ func TestWithHMACSHA1(t *testing.T) {
 func TestWithHMACSHA256(t *testing.T) {
 	testHash(t, sha256.New, "SHA256", sha256TestVectors)
 }
+
+var sink uint8
+
+func benchmark(b *testing.B, h func() hash.Hash) {
+	password := make([]byte, h().Size())
+	salt := make([]byte, 8)
+	for i := 0; i < b.N; i++ {
+		password = Key(password, salt, 4096, len(password), h)
+	}
+	sink += password[0]
+}
+
+func BenchmarkHMACSHA1(b *testing.B) {
+	benchmark(b, sha1.New)
+}
+
+func BenchmarkHMACSHA256(b *testing.B) {
+	benchmark(b, sha256.New)
+}
diff --git a/vendor/golang.org/x/crypto/pkcs12/internal/rc2/rc2.go b/vendor/golang.org/x/crypto/pkcs12/internal/rc2/rc2.go
index 8c7090258..7499e3fb6 100644
--- a/vendor/golang.org/x/crypto/pkcs12/internal/rc2/rc2.go
+++ b/vendor/golang.org/x/crypto/pkcs12/internal/rc2/rc2.go
@@ -122,7 +122,6 @@ func (c *rc2Cipher) Encrypt(dst, src []byte) {
 	r3 = r3 + c.k[r2&63]
 
 	for j <= 40 {
-
 		// mix r0
 		r0 = r0 + c.k[j] + (r3 & r2) + ((^r3) & r1)
 		r0 = rotl16(r0, 1)
@@ -151,7 +150,6 @@ func (c *rc2Cipher) Encrypt(dst, src []byte) {
 	r3 = r3 + c.k[r2&63]
 
 	for j <= 60 {
-
 		// mix r0
 		r0 = r0 + c.k[j] + (r3 & r2) + ((^r3) & r1)
 		r0 = rotl16(r0, 1)
@@ -244,7 +242,6 @@ func (c *rc2Cipher) Decrypt(dst, src []byte) {
 	r0 = r0 - c.k[r3&63]
 
 	for j >= 0 {
-
 		// unmix r3
 		r3 = rotl16(r3, 16-5)
 		r3 = r3 - c.k[j] - (r2 & r1) - ((^r2) & r0)
diff --git a/vendor/golang.org/x/crypto/pkcs12/internal/rc2/rc2_test.go b/vendor/golang.org/x/crypto/pkcs12/internal/rc2/rc2_test.go
index 8a49dfaf3..51a7efe50 100644
--- a/vendor/golang.org/x/crypto/pkcs12/internal/rc2/rc2_test.go
+++ b/vendor/golang.org/x/crypto/pkcs12/internal/rc2/rc2_test.go
@@ -11,7 +11,6 @@ import (
 )
 
 func TestEncryptDecrypt(t *testing.T) {
-
 	// TODO(dgryski): add the rest of the test vectors from the RFC
 	var tests = []struct {
 		key    string
diff --git a/vendor/golang.org/x/crypto/sha3/sha3_test.go b/vendor/golang.org/x/crypto/sha3/sha3_test.go
index 312e8f907..2c8719b44 100644
--- a/vendor/golang.org/x/crypto/sha3/sha3_test.go
+++ b/vendor/golang.org/x/crypto/sha3/sha3_test.go
@@ -202,7 +202,7 @@ func TestSqueezing(t *testing.T) {
 			d1 := newShakeHash()
 			d1.Write([]byte(testString))
 			var multiple []byte
-			for _ = range ref {
+			for range ref {
 				one := make([]byte, 1)
 				d1.Read(one)
 				multiple = append(multiple, one...)
diff --git a/vendor/golang.org/x/crypto/ssh/agent/client.go b/vendor/golang.org/x/crypto/ssh/agent/client.go
index dce7682fa..acb5ad80e 100644
--- a/vendor/golang.org/x/crypto/ssh/agent/client.go
+++ b/vendor/golang.org/x/crypto/ssh/agent/client.go
@@ -98,7 +98,7 @@ const (
 	agentAddIdentity         = 17
 	agentRemoveIdentity      = 18
 	agentRemoveAllIdentities = 19
-	agentAddIdConstrained    = 25
+	agentAddIDConstrained    = 25
 
 	// 3.3 Key-type independent requests from client to agent
 	agentAddSmartcardKey            = 20
@@ -515,7 +515,7 @@ func (c *client) insertKey(s interface{}, comment string, constraints []byte) er
 
 	// if constraints are present then the message type needs to be changed.
 	if len(constraints) != 0 {
-		req[0] = agentAddIdConstrained
+		req[0] = agentAddIDConstrained
 	}
 
 	resp, err := c.call(req)
@@ -577,11 +577,11 @@ func (c *client) Add(key AddedKey) error {
 		constraints = append(constraints, agentConstrainConfirm)
 	}
 
-	if cert := key.Certificate; cert == nil {
+	cert := key.Certificate
+	if cert == nil {
 		return c.insertKey(key.PrivateKey, key.Comment, constraints)
-	} else {
-		return c.insertCert(key.PrivateKey, cert, key.Comment, constraints)
 	}
+	return c.insertCert(key.PrivateKey, cert, key.Comment, constraints)
 }
 
 func (c *client) insertCert(s interface{}, cert *ssh.Certificate, comment string, constraints []byte) error {
@@ -633,7 +633,7 @@ func (c *client) insertCert(s interface{}, cert *ssh.Certificate, comment string
 
 	// if constraints are present then the message type needs to be changed.
 	if len(constraints) != 0 {
-		req[0] = agentAddIdConstrained
+		req[0] = agentAddIDConstrained
 	}
 
 	signer, err := ssh.NewSignerFromKey(s)
diff --git a/vendor/golang.org/x/crypto/ssh/agent/server.go b/vendor/golang.org/x/crypto/ssh/agent/server.go
index 321e48a26..2e4692cbd 100644
--- a/vendor/golang.org/x/crypto/ssh/agent/server.go
+++ b/vendor/golang.org/x/crypto/ssh/agent/server.go
@@ -148,7 +148,7 @@ func (s *server) processRequest(data []byte) (interface{}, error) {
 		}
 		return rep, nil
 
-	case agentAddIdConstrained, agentAddIdentity:
+	case agentAddIDConstrained, agentAddIdentity:
 		return nil, s.insertIdentity(data)
 	}
 
diff --git a/vendor/golang.org/x/crypto/ssh/benchmark_test.go b/vendor/golang.org/x/crypto/ssh/benchmark_test.go
index d9f7eb9b6..20c330773 100644
--- a/vendor/golang.org/x/crypto/ssh/benchmark_test.go
+++ b/vendor/golang.org/x/crypto/ssh/benchmark_test.go
@@ -40,7 +40,8 @@ func sshPipe() (Conn, *server, error) {
 	}
 
 	clientConf := ClientConfig{
-		User: "user",
+		User:            "user",
+		HostKeyCallback: InsecureIgnoreHostKey(),
 	}
 	serverConf := ServerConfig{
 		NoClientAuth: true,
diff --git a/vendor/golang.org/x/crypto/ssh/certs.go b/vendor/golang.org/x/crypto/ssh/certs.go
index b1f022078..cfc8ead1b 100644
--- a/vendor/golang.org/x/crypto/ssh/certs.go
+++ b/vendor/golang.org/x/crypto/ssh/certs.go
@@ -340,10 +340,10 @@ func (c *CertChecker) Authenticate(conn ConnMetadata, pubKey PublicKey) (*Permis
 // the signature of the certificate.
 func (c *CertChecker) CheckCert(principal string, cert *Certificate) error {
 	if c.IsRevoked != nil && c.IsRevoked(cert) {
-		return fmt.Errorf("ssh: certicate serial %d revoked", cert.Serial)
+		return fmt.Errorf("ssh: certificate serial %d revoked", cert.Serial)
 	}
 
-	for opt, _ := range cert.CriticalOptions {
+	for opt := range cert.CriticalOptions {
 		// sourceAddressCriticalOption will be enforced by
 		// serverAuthenticate
 		if opt == sourceAddressCriticalOption {
diff --git a/vendor/golang.org/x/crypto/ssh/certs_test.go b/vendor/golang.org/x/crypto/ssh/certs_test.go
index 0200531f4..c8e7cf585 100644
--- a/vendor/golang.org/x/crypto/ssh/certs_test.go
+++ b/vendor/golang.org/x/crypto/ssh/certs_test.go
@@ -6,10 +6,15 @@ package ssh
 
 import (
 	"bytes"
+	"crypto/ecdsa"
+	"crypto/elliptic"
 	"crypto/rand"
+	"net"
 	"reflect"
 	"testing"
 	"time"
+
+	"golang.org/x/crypto/ssh/testdata"
 )
 
 // Cert generated by ssh-keygen 6.0p1 Debian-4.
@@ -220,3 +225,111 @@ func TestHostKeyCert(t *testing.T) {
 		}
 	}
 }
+
+func TestCertTypes(t *testing.T) {
+	var testVars = []struct {
+		name string
+		keys func() Signer
+	}{
+		{
+			name: CertAlgoECDSA256v01,
+			keys: func() Signer {
+				s, _ := ParsePrivateKey(testdata.PEMBytes["ecdsap256"])
+				return s
+			},
+		},
+		{
+			name: CertAlgoECDSA384v01,
+			keys: func() Signer {
+				s, _ := ParsePrivateKey(testdata.PEMBytes["ecdsap384"])
+				return s
+			},
+		},
+		{
+			name: CertAlgoECDSA521v01,
+			keys: func() Signer {
+				s, _ := ParsePrivateKey(testdata.PEMBytes["ecdsap521"])
+				return s
+			},
+		},
+		{
+			name: CertAlgoED25519v01,
+			keys: func() Signer {
+				s, _ := ParsePrivateKey(testdata.PEMBytes["ed25519"])
+				return s
+			},
+		},
+		{
+			name: CertAlgoRSAv01,
+			keys: func() Signer {
+				s, _ := ParsePrivateKey(testdata.PEMBytes["rsa"])
+				return s
+			},
+		},
+		{
+			name: CertAlgoDSAv01,
+			keys: func() Signer {
+				s, _ := ParsePrivateKey(testdata.PEMBytes["dsa"])
+				return s
+			},
+		},
+	}
+
+	k, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	if err != nil {
+		t.Fatalf("error generating host key: %v", err)
+	}
+
+	signer, err := NewSignerFromKey(k)
+	if err != nil {
+		t.Fatalf("error generating signer for ssh listener: %v", err)
+	}
+
+	conf := &ServerConfig{
+		PublicKeyCallback: func(c ConnMetadata, k PublicKey) (*Permissions, error) {
+			return new(Permissions), nil
+		},
+	}
+	conf.AddHostKey(signer)
+
+	for _, m := range testVars {
+		t.Run(m.name, func(t *testing.T) {
+
+			c1, c2, err := netPipe()
+			if err != nil {
+				t.Fatalf("netPipe: %v", err)
+			}
+			defer c1.Close()
+			defer c2.Close()
+
+			go NewServerConn(c1, conf)
+
+			priv := m.keys()
+			if err != nil {
+				t.Fatalf("error generating ssh pubkey: %v", err)
+			}
+
+			cert := &Certificate{
+				CertType: UserCert,
+				Key:      priv.PublicKey(),
+			}
+			cert.SignCert(rand.Reader, priv)
+
+			certSigner, err := NewCertSigner(cert, priv)
+			if err != nil {
+				t.Fatalf("error generating cert signer: %v", err)
+			}
+
+			config := &ClientConfig{
+				User:            "user",
+				HostKeyCallback: func(h string, r net.Addr, k PublicKey) error { return nil },
+				Auth:            []AuthMethod{PublicKeys(certSigner)},
+			}
+
+			_, _, _, err = NewClientConn(c2, "", config)
+			if err != nil {
+				t.Fatalf("error connecting: %v", err)
+			}
+		})
+	}
+}
diff --git a/vendor/golang.org/x/crypto/ssh/channel.go b/vendor/golang.org/x/crypto/ssh/channel.go
index 195530ea0..c0834c00d 100644
--- a/vendor/golang.org/x/crypto/ssh/channel.go
+++ b/vendor/golang.org/x/crypto/ssh/channel.go
@@ -205,32 +205,32 @@ type channel struct {
 
 // writePacket sends a packet. If the packet is a channel close, it updates
 // sentClose. This method takes the lock c.writeMu.
-func (c *channel) writePacket(packet []byte) error {
-	c.writeMu.Lock()
-	if c.sentClose {
-		c.writeMu.Unlock()
+func (ch *channel) writePacket(packet []byte) error {
+	ch.writeMu.Lock()
+	if ch.sentClose {
+		ch.writeMu.Unlock()
 		return io.EOF
 	}
-	c.sentClose = (packet[0] == msgChannelClose)
-	err := c.mux.conn.writePacket(packet)
-	c.writeMu.Unlock()
+	ch.sentClose = (packet[0] == msgChannelClose)
+	err := ch.mux.conn.writePacket(packet)
+	ch.writeMu.Unlock()
 	return err
 }
 
-func (c *channel) sendMessage(msg interface{}) error {
+func (ch *channel) sendMessage(msg interface{}) error {
 	if debugMux {
-		log.Printf("send(%d): %#v", c.mux.chanList.offset, msg)
+		log.Printf("send(%d): %#v", ch.mux.chanList.offset, msg)
 	}
 
 	p := Marshal(msg)
-	binary.BigEndian.PutUint32(p[1:], c.remoteId)
-	return c.writePacket(p)
+	binary.BigEndian.PutUint32(p[1:], ch.remoteId)
+	return ch.writePacket(p)
 }
 
 // WriteExtended writes data to a specific extended stream. These streams are
 // used, for example, for stderr.
-func (c *channel) WriteExtended(data []byte, extendedCode uint32) (n int, err error) {
-	if c.sentEOF {
+func (ch *channel) WriteExtended(data []byte, extendedCode uint32) (n int, err error) {
+	if ch.sentEOF {
 		return 0, io.EOF
 	}
 	// 1 byte message type, 4 bytes remoteId, 4 bytes data length
@@ -241,16 +241,16 @@ func (c *channel) WriteExtended(data []byte, extendedCode uint32) (n int, err er
 		opCode = msgChannelExtendedData
 	}
 
-	c.writeMu.Lock()
-	packet := c.packetPool[extendedCode]
+	ch.writeMu.Lock()
+	packet := ch.packetPool[extendedCode]
 	// We don't remove the buffer from packetPool, so
 	// WriteExtended calls from different goroutines will be
 	// flagged as errors by the race detector.
-	c.writeMu.Unlock()
+	ch.writeMu.Unlock()
 
 	for len(data) > 0 {
-		space := min(c.maxRemotePayload, len(data))
-		if space, err = c.remoteWin.reserve(space); err != nil {
+		space := min(ch.maxRemotePayload, len(data))
+		if space, err = ch.remoteWin.reserve(space); err != nil {
 			return n, err
 		}
 		if want := headerLength + space; uint32(cap(packet)) < want {
@@ -262,13 +262,13 @@ func (c *channel) WriteExtended(data []byte, extendedCode uint32) (n int, err er
 		todo := data[:space]
 
 		packet[0] = opCode
-		binary.BigEndian.PutUint32(packet[1:], c.remoteId)
+		binary.BigEndian.PutUint32(packet[1:], ch.remoteId)
 		if extendedCode > 0 {
 			binary.BigEndian.PutUint32(packet[5:], uint32(extendedCode))
 		}
 		binary.BigEndian.PutUint32(packet[headerLength-4:], uint32(len(todo)))
 		copy(packet[headerLength:], todo)
-		if err = c.writePacket(packet); err != nil {
+		if err = ch.writePacket(packet); err != nil {
 			return n, err
 		}
 
@@ -276,14 +276,14 @@ func (c *channel) WriteExtended(data []byte, extendedCode uint32) (n int, err er
 		data = data[len(todo):]
 	}
 
-	c.writeMu.Lock()
-	c.packetPool[extendedCode] = packet
-	c.writeMu.Unlock()
+	ch.writeMu.Lock()
+	ch.packetPool[extendedCode] = packet
+	ch.writeMu.Unlock()
 
 	return n, err
 }
 
-func (c *channel) handleData(packet []byte) error {
+func (ch *channel) handleData(packet []byte) error {
 	headerLen := 9
 	isExtendedData := packet[0] == msgChannelExtendedData
 	if isExtendedData {
@@ -303,7 +303,7 @@ func (c *channel) handleData(packet []byte) error {
 	if length == 0 {
 		return nil
 	}
-	if length > c.maxIncomingPayload {
+	if length > ch.maxIncomingPayload {
 		// TODO(hanwen): should send Disconnect?
 		return errors.New("ssh: incoming packet exceeds maximum payload size")
 	}
@@ -313,21 +313,21 @@ func (c *channel) handleData(packet []byte) error {
 		return errors.New("ssh: wrong packet length")
 	}
 
-	c.windowMu.Lock()
-	if c.myWindow < length {
-		c.windowMu.Unlock()
+	ch.windowMu.Lock()
+	if ch.myWindow < length {
+		ch.windowMu.Unlock()
 		// TODO(hanwen): should send Disconnect with reason?
 		return errors.New("ssh: remote side wrote too much")
 	}
-	c.myWindow -= length
-	c.windowMu.Unlock()
+	ch.myWindow -= length
+	ch.windowMu.Unlock()
 
 	if extended == 1 {
-		c.extPending.write(data)
+		ch.extPending.write(data)
 	} else if extended > 0 {
 		// discard other extended data.
 	} else {
-		c.pending.write(data)
+		ch.pending.write(data)
 	}
 	return nil
 }
@@ -384,31 +384,31 @@ func (c *channel) close() {
 // responseMessageReceived is called when a success or failure message is
 // received on a channel to check that such a message is reasonable for the
 // given channel.
-func (c *channel) responseMessageReceived() error {
-	if c.direction == channelInbound {
+func (ch *channel) responseMessageReceived() error {
+	if ch.direction == channelInbound {
 		return errors.New("ssh: channel response message received on inbound channel")
 	}
-	if c.decided {
+	if ch.decided {
 		return errors.New("ssh: duplicate response received for channel")
 	}
-	c.decided = true
+	ch.decided = true
 	return nil
 }
 
-func (c *channel) handlePacket(packet []byte) error {
+func (ch *channel) handlePacket(packet []byte) error {
 	switch packet[0] {
 	case msgChannelData, msgChannelExtendedData:
-		return c.handleData(packet)
+		return ch.handleData(packet)
 	case msgChannelClose:
-		c.sendMessage(channelCloseMsg{PeersId: c.remoteId})
-		c.mux.chanList.remove(c.localId)
-		c.close()
+		ch.sendMessage(channelCloseMsg{PeersID: ch.remoteId})
+		ch.mux.chanList.remove(ch.localId)
+		ch.close()
 		return nil
 	case msgChannelEOF:
 		// RFC 4254 is mute on how EOF affects dataExt messages but
 		// it is logical to signal EOF at the same time.
-		c.extPending.eof()
-		c.pending.eof()
+		ch.extPending.eof()
+		ch.pending.eof()
 		return nil
 	}
 
@@ -419,24 +419,24 @@ func (c *channel) handlePacket(packet []byte) error {
 
 	switch msg := decoded.(type) {
 	case *channelOpenFailureMsg:
-		if err := c.responseMessageReceived(); err != nil {
+		if err := ch.responseMessageReceived(); err != nil {
 			return err
 		}
-		c.mux.chanList.remove(msg.PeersId)
-		c.msg <- msg
+		ch.mux.chanList.remove(msg.PeersID)
+		ch.msg <- msg
 	case *channelOpenConfirmMsg:
-		if err := c.responseMessageReceived(); err != nil {
+		if err := ch.responseMessageReceived(); err != nil {
 			return err
 		}
 		if msg.MaxPacketSize < minPacketLength || msg.MaxPacketSize > 1<<31 {
 			return fmt.Errorf("ssh: invalid MaxPacketSize %d from peer", msg.MaxPacketSize)
 		}
-		c.remoteId = msg.MyId
-		c.maxRemotePayload = msg.MaxPacketSize
-		c.remoteWin.add(msg.MyWindow)
-		c.msg <- msg
+		ch.remoteId = msg.MyID
+		ch.maxRemotePayload = msg.MaxPacketSize
+		ch.remoteWin.add(msg.MyWindow)
+		ch.msg <- msg
 	case *windowAdjustMsg:
-		if !c.remoteWin.add(msg.AdditionalBytes) {
+		if !ch.remoteWin.add(msg.AdditionalBytes) {
 			return fmt.Errorf("ssh: invalid window update for %d bytes", msg.AdditionalBytes)
 		}
 	case *channelRequestMsg:
@@ -444,12 +444,12 @@ func (c *channel) handlePacket(packet []byte) error {
 			Type:      msg.Request,
 			WantReply: msg.WantReply,
 			Payload:   msg.RequestSpecificData,
-			ch:        c,
+			ch:        ch,
 		}
 
-		c.incomingRequests <- &req
+		ch.incomingRequests <- &req
 	default:
-		c.msg <- msg
+		ch.msg <- msg
 	}
 	return nil
 }
@@ -488,23 +488,23 @@ func (e *extChannel) Read(data []byte) (n int, err error) {
 	return e.ch.ReadExtended(data, e.code)
 }
 
-func (c *channel) Accept() (Channel, <-chan *Request, error) {
-	if c.decided {
+func (ch *channel) Accept() (Channel, <-chan *Request, error) {
+	if ch.decided {
 		return nil, nil, errDecidedAlready
 	}
-	c.maxIncomingPayload = channelMaxPacket
+	ch.maxIncomingPayload = channelMaxPacket
 	confirm := channelOpenConfirmMsg{
-		PeersId:       c.remoteId,
-		MyId:          c.localId,
-		MyWindow:      c.myWindow,
-		MaxPacketSize: c.maxIncomingPayload,
+		PeersID:       ch.remoteId,
+		MyID:          ch.localId,
+		MyWindow:      ch.myWindow,
+		MaxPacketSize: ch.maxIncomingPayload,
 	}
-	c.decided = true
-	if err := c.sendMessage(confirm); err != nil {
+	ch.decided = true
+	if err := ch.sendMessage(confirm); err != nil {
 		return nil, nil, err
 	}
 
-	return c, c.incomingRequests, nil
+	return ch, ch.incomingRequests, nil
 }
 
 func (ch *channel) Reject(reason RejectionReason, message string) error {
@@ -512,7 +512,7 @@ func (ch *channel) Reject(reason RejectionReason, message string) error {
 		return errDecidedAlready
 	}
 	reject := channelOpenFailureMsg{
-		PeersId:  ch.remoteId,
+		PeersID:  ch.remoteId,
 		Reason:   reason,
 		Message:  message,
 		Language: "en",
@@ -541,7 +541,7 @@ func (ch *channel) CloseWrite() error {
 	}
 	ch.sentEOF = true
 	return ch.sendMessage(channelEOFMsg{
-		PeersId: ch.remoteId})
+		PeersID: ch.remoteId})
 }
 
 func (ch *channel) Close() error {
@@ -550,7 +550,7 @@ func (ch *channel) Close() error {
 	}
 
 	return ch.sendMessage(channelCloseMsg{
-		PeersId: ch.remoteId})
+		PeersID: ch.remoteId})
 }
 
 // Extended returns an io.ReadWriter that sends and receives data on the given,
@@ -577,7 +577,7 @@ func (ch *channel) SendRequest(name string, wantReply bool, payload []byte) (boo
 	}
 
 	msg := channelRequestMsg{
-		PeersId:             ch.remoteId,
+		PeersID:             ch.remoteId,
 		Request:             name,
 		WantReply:           wantReply,
 		RequestSpecificData: payload,
@@ -614,11 +614,11 @@ func (ch *channel) ackRequest(ok bool) error {
 	var msg interface{}
 	if !ok {
 		msg = channelRequestFailureMsg{
-			PeersId: ch.remoteId,
+			PeersID: ch.remoteId,
 		}
 	} else {
 		msg = channelRequestSuccessMsg{
-			PeersId: ch.remoteId,
+			PeersID: ch.remoteId,
 		}
 	}
 	return ch.sendMessage(msg)
diff --git a/vendor/golang.org/x/crypto/ssh/cipher.go b/vendor/golang.org/x/crypto/ssh/cipher.go
index aed2b1f01..e67c5e0aa 100644
--- a/vendor/golang.org/x/crypto/ssh/cipher.go
+++ b/vendor/golang.org/x/crypto/ssh/cipher.go
@@ -372,7 +372,7 @@ func (c *gcmCipher) readPacket(seqNum uint32, r io.Reader) ([]byte, error) {
 	}
 	length := binary.BigEndian.Uint32(c.prefix[:])
 	if length > maxPacket {
-		return nil, errors.New("ssh: max packet length exceeded.")
+		return nil, errors.New("ssh: max packet length exceeded")
 	}
 
 	if cap(c.buf) < int(length+gcmTagSize) {
@@ -548,11 +548,11 @@ func (c *cbcCipher) readPacketLeaky(seqNum uint32, r io.Reader) ([]byte, error)
 		c.packetData = c.packetData[:entirePacketSize]
 	}
 
-	if n, err := io.ReadFull(r, c.packetData[firstBlockLength:]); err != nil {
+	n, err := io.ReadFull(r, c.packetData[firstBlockLength:])
+	if err != nil {
 		return nil, err
-	} else {
-		c.oracleCamouflage -= uint32(n)
 	}
+	c.oracleCamouflage -= uint32(n)
 
 	remainingCrypted := c.packetData[firstBlockLength:macStart]
 	c.decrypter.CryptBlocks(remainingCrypted, remainingCrypted)
diff --git a/vendor/golang.org/x/crypto/ssh/cipher_test.go b/vendor/golang.org/x/crypto/ssh/cipher_test.go
index 5cfa17a62..6a35d8708 100644
--- a/vendor/golang.org/x/crypto/ssh/cipher_test.go
+++ b/vendor/golang.org/x/crypto/ssh/cipher_test.go
@@ -21,47 +21,48 @@ func TestDefaultCiphersExist(t *testing.T) {
 }
 
 func TestPacketCiphers(t *testing.T) {
-	// Still test aes128cbc cipher although it's commented out.
-	cipherModes[aes128cbcID] = &streamCipherMode{16, aes.BlockSize, 0, nil}
-	defer delete(cipherModes, aes128cbcID)
-
+	defaultMac := "hmac-sha2-256"
+	defaultCipher := "aes128-ctr"
 	for cipher := range cipherModes {
-		for mac := range macModes {
-			kr := &kexResult{Hash: crypto.SHA1}
-			algs := directionAlgorithms{
-				Cipher:      cipher,
-				MAC:         mac,
-				Compression: "none",
-			}
-			client, err := newPacketCipher(clientKeys, algs, kr)
-			if err != nil {
-				t.Errorf("newPacketCipher(client, %q, %q): %v", cipher, mac, err)
-				continue
-			}
-			server, err := newPacketCipher(clientKeys, algs, kr)
-			if err != nil {
-				t.Errorf("newPacketCipher(client, %q, %q): %v", cipher, mac, err)
-				continue
-			}
-
-			want := "bla bla"
-			input := []byte(want)
-			buf := &bytes.Buffer{}
-			if err := client.writePacket(0, buf, rand.Reader, input); err != nil {
-				t.Errorf("writePacket(%q, %q): %v", cipher, mac, err)
-				continue
-			}
-
-			packet, err := server.readPacket(0, buf)
-			if err != nil {
-				t.Errorf("readPacket(%q, %q): %v", cipher, mac, err)
-				continue
-			}
-
-			if string(packet) != want {
-				t.Errorf("roundtrip(%q, %q): got %q, want %q", cipher, mac, packet, want)
-			}
-		}
+		t.Run("cipher="+cipher,
+			func(t *testing.T) { testPacketCipher(t, cipher, defaultMac) })
+	}
+	for mac := range macModes {
+		t.Run("mac="+mac,
+			func(t *testing.T) { testPacketCipher(t, defaultCipher, mac) })
+	}
+}
+
+func testPacketCipher(t *testing.T, cipher, mac string) {
+	kr := &kexResult{Hash: crypto.SHA1}
+	algs := directionAlgorithms{
+		Cipher:      cipher,
+		MAC:         mac,
+		Compression: "none",
+	}
+	client, err := newPacketCipher(clientKeys, algs, kr)
+	if err != nil {
+		t.Fatalf("newPacketCipher(client, %q, %q): %v", cipher, mac, err)
+	}
+	server, err := newPacketCipher(clientKeys, algs, kr)
+	if err != nil {
+		t.Fatalf("newPacketCipher(client, %q, %q): %v", cipher, mac, err)
+	}
+
+	want := "bla bla"
+	input := []byte(want)
+	buf := &bytes.Buffer{}
+	if err := client.writePacket(0, buf, rand.Reader, input); err != nil {
+		t.Fatalf("writePacket(%q, %q): %v", cipher, mac, err)
+	}
+
+	packet, err := server.readPacket(0, buf)
+	if err != nil {
+		t.Fatalf("readPacket(%q, %q): %v", cipher, mac, err)
+	}
+
+	if string(packet) != want {
+		t.Errorf("roundtrip(%q, %q): got %q, want %q", cipher, mac, packet, want)
 	}
 }
 
diff --git a/vendor/golang.org/x/crypto/ssh/client.go b/vendor/golang.org/x/crypto/ssh/client.go
index a7e3263bc..6fd199455 100644
--- a/vendor/golang.org/x/crypto/ssh/client.go
+++ b/vendor/golang.org/x/crypto/ssh/client.go
@@ -9,6 +9,7 @@ import (
 	"errors"
 	"fmt"
 	"net"
+	"os"
 	"sync"
 	"time"
 )
@@ -187,6 +188,10 @@ func Dial(network, addr string, config *ClientConfig) (*Client, error) {
 // net.Conn underlying the the SSH connection.
 type HostKeyCallback func(hostname string, remote net.Addr, key PublicKey) error
 
+// BannerCallback is the function type used for treat the banner sent by
+// the server. A BannerCallback receives the message sent by the remote server.
+type BannerCallback func(message string) error
+
 // A ClientConfig structure is used to configure a Client. It must not be
 // modified after having been passed to an SSH function.
 type ClientConfig struct {
@@ -209,6 +214,12 @@ type ClientConfig struct {
 	// FixedHostKey can be used for simplistic host key checks.
 	HostKeyCallback HostKeyCallback
 
+	// BannerCallback is called during the SSH dance to display a custom
+	// server's message. The client configuration can supply this callback to
+	// handle it as wished. The function BannerDisplayStderr can be used for
+	// simplistic display on Stderr.
+	BannerCallback BannerCallback
+
 	// ClientVersion contains the version identification string that will
 	// be used for the connection. If empty, a reasonable default is used.
 	ClientVersion string
@@ -255,3 +266,13 @@ func FixedHostKey(key PublicKey) HostKeyCallback {
 	hk := &fixedHostKey{key}
 	return hk.check
 }
+
+// BannerDisplayStderr returns a function that can be used for
+// ClientConfig.BannerCallback to display banners on os.Stderr.
+func BannerDisplayStderr() BannerCallback {
+	return func(banner string) error {
+		_, err := os.Stderr.WriteString(banner)
+
+		return err
+	}
+}
diff --git a/vendor/golang.org/x/crypto/ssh/client_auth.go b/vendor/golang.org/x/crypto/ssh/client_auth.go
index 3acd8d498..a1252cb9b 100644
--- a/vendor/golang.org/x/crypto/ssh/client_auth.go
+++ b/vendor/golang.org/x/crypto/ssh/client_auth.go
@@ -283,7 +283,9 @@ func confirmKeyAck(key PublicKey, c packetConn) (bool, error) {
 		}
 		switch packet[0] {
 		case msgUserAuthBanner:
-			// TODO(gpaul): add callback to present the banner to the user
+			if err := handleBannerResponse(c, packet); err != nil {
+				return false, err
+			}
 		case msgUserAuthPubKeyOk:
 			var msg userAuthPubKeyOkMsg
 			if err := Unmarshal(packet, &msg); err != nil {
@@ -325,7 +327,9 @@ func handleAuthResponse(c packetConn) (bool, []string, error) {
 
 		switch packet[0] {
 		case msgUserAuthBanner:
-			// TODO: add callback to present the banner to the user
+			if err := handleBannerResponse(c, packet); err != nil {
+				return false, nil, err
+			}
 		case msgUserAuthFailure:
 			var msg userAuthFailureMsg
 			if err := Unmarshal(packet, &msg); err != nil {
@@ -340,6 +344,24 @@ func handleAuthResponse(c packetConn) (bool, []string, error) {
 	}
 }
 
+func handleBannerResponse(c packetConn, packet []byte) error {
+	var msg userAuthBannerMsg
+	if err := Unmarshal(packet, &msg); err != nil {
+		return err
+	}
+
+	transport, ok := c.(*handshakeTransport)
+	if !ok {
+		return nil
+	}
+
+	if transport.bannerCallback != nil {
+		return transport.bannerCallback(msg.Message)
+	}
+
+	return nil
+}
+
 // KeyboardInteractiveChallenge should print questions, optionally
 // disabling echoing (e.g. for passwords), and return all the answers.
 // Challenge may be called multiple times in a single session. After
@@ -385,7 +407,9 @@ func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packe
 		// like handleAuthResponse, but with less options.
 		switch packet[0] {
 		case msgUserAuthBanner:
-			// TODO: Print banners during userauth.
+			if err := handleBannerResponse(c, packet); err != nil {
+				return false, nil, err
+			}
 			continue
 		case msgUserAuthInfoRequest:
 			// OK
diff --git a/vendor/golang.org/x/crypto/ssh/client_test.go b/vendor/golang.org/x/crypto/ssh/client_test.go
index ccf56074d..ef95069ef 100644
--- a/vendor/golang.org/x/crypto/ssh/client_test.go
+++ b/vendor/golang.org/x/crypto/ssh/client_test.go
@@ -79,3 +79,52 @@ func TestHostKeyCheck(t *testing.T) {
 		}
 	}
 }
+
+func TestBannerCallback(t *testing.T) {
+	c1, c2, err := netPipe()
+	if err != nil {
+		t.Fatalf("netPipe: %v", err)
+	}
+	defer c1.Close()
+	defer c2.Close()
+
+	serverConf := &ServerConfig{
+		PasswordCallback: func(conn ConnMetadata, password []byte) (*Permissions, error) {
+			return &Permissions{}, nil
+		},
+		BannerCallback: func(conn ConnMetadata) string {
+			return "Hello World"
+		},
+	}
+	serverConf.AddHostKey(testSigners["rsa"])
+	go NewServerConn(c1, serverConf)
+
+	var receivedBanner string
+	var bannerCount int
+	clientConf := ClientConfig{
+		Auth: []AuthMethod{
+			Password("123"),
+		},
+		User:            "user",
+		HostKeyCallback: InsecureIgnoreHostKey(),
+		BannerCallback: func(message string) error {
+			bannerCount++
+			receivedBanner = message
+			return nil
+		},
+	}
+
+	_, _, _, err = NewClientConn(c2, "", &clientConf)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if bannerCount != 1 {
+		t.Errorf("got %d banners; want 1", bannerCount)
+	}
+
+	expected := "Hello World"
+	if receivedBanner != expected {
+		t.Fatalf("got %s; want %s", receivedBanner, expected)
+	}
+}
diff --git a/vendor/golang.org/x/crypto/ssh/common.go b/vendor/golang.org/x/crypto/ssh/common.go
index dc39e4d23..135b4edd7 100644
--- a/vendor/golang.org/x/crypto/ssh/common.go
+++ b/vendor/golang.org/x/crypto/ssh/common.go
@@ -242,7 +242,7 @@ func (c *Config) SetDefaults() {
 
 // buildDataSignedForAuth returns the data that is signed in order to prove
 // possession of a private key. See RFC 4252, section 7.
-func buildDataSignedForAuth(sessionId []byte, req userAuthRequestMsg, algo, pubKey []byte) []byte {
+func buildDataSignedForAuth(sessionID []byte, req userAuthRequestMsg, algo, pubKey []byte) []byte {
 	data := struct {
 		Session []byte
 		Type    byte
@@ -253,7 +253,7 @@ func buildDataSignedForAuth(sessionId []byte, req userAuthRequestMsg, algo, pubK
 		Algo    []byte
 		PubKey  []byte
 	}{
-		sessionId,
+		sessionID,
 		msgUserAuthRequest,
 		req.User,
 		req.Service,
diff --git a/vendor/golang.org/x/crypto/ssh/handshake.go b/vendor/golang.org/x/crypto/ssh/handshake.go
index 932ce8393..4f7912ecd 100644
--- a/vendor/golang.org/x/crypto/ssh/handshake.go
+++ b/vendor/golang.org/x/crypto/ssh/handshake.go
@@ -78,6 +78,11 @@ type handshakeTransport struct {
 	dialAddress     string
 	remoteAddr      net.Addr
 
+	// bannerCallback is non-empty if we are the client and it has been set in
+	// ClientConfig. In that case it is called during the user authentication
+	// dance to handle a custom server's message.
+	bannerCallback BannerCallback
+
 	// Algorithms agreed in the last key exchange.
 	algorithms *algorithms
 
@@ -120,6 +125,7 @@ func newClientTransport(conn keyingTransport, clientVersion, serverVersion []byt
 	t.dialAddress = dialAddr
 	t.remoteAddr = addr
 	t.hostKeyCallback = config.HostKeyCallback
+	t.bannerCallback = config.BannerCallback
 	if config.HostKeyAlgorithms != nil {
 		t.hostKeyAlgorithms = config.HostKeyAlgorithms
 	} else {
diff --git a/vendor/golang.org/x/crypto/ssh/kex.go b/vendor/golang.org/x/crypto/ssh/kex.go
index f91c2770e..f34bcc013 100644
--- a/vendor/golang.org/x/crypto/ssh/kex.go
+++ b/vendor/golang.org/x/crypto/ssh/kex.go
@@ -119,7 +119,7 @@ func (group *dhGroup) Client(c packetConn, randSource io.Reader, magics *handsha
 		return nil, err
 	}
 
-	kInt, err := group.diffieHellman(kexDHReply.Y, x)
+	ki, err := group.diffieHellman(kexDHReply.Y, x)
 	if err != nil {
 		return nil, err
 	}
@@ -129,8 +129,8 @@ func (group *dhGroup) Client(c packetConn, randSource io.Reader, magics *handsha
 	writeString(h, kexDHReply.HostKey)
 	writeInt(h, X)
 	writeInt(h, kexDHReply.Y)
-	K := make([]byte, intLength(kInt))
-	marshalInt(K, kInt)
+	K := make([]byte, intLength(ki))
+	marshalInt(K, ki)
 	h.Write(K)
 
 	return &kexResult{
@@ -164,7 +164,7 @@ func (group *dhGroup) Server(c packetConn, randSource io.Reader, magics *handsha
 	}
 
 	Y := new(big.Int).Exp(group.g, y, group.p)
-	kInt, err := group.diffieHellman(kexDHInit.X, y)
+	ki, err := group.diffieHellman(kexDHInit.X, y)
 	if err != nil {
 		return nil, err
 	}
@@ -177,8 +177,8 @@ func (group *dhGroup) Server(c packetConn, randSource io.Reader, magics *handsha
 	writeInt(h, kexDHInit.X)
 	writeInt(h, Y)
 
-	K := make([]byte, intLength(kInt))
-	marshalInt(K, kInt)
+	K := make([]byte, intLength(ki))
+	marshalInt(K, ki)
 	h.Write(K)
 
 	H := h.Sum(nil)
@@ -462,9 +462,9 @@ func (kex *curve25519sha256) Client(c packetConn, rand io.Reader, magics *handsh
 	writeString(h, kp.pub[:])
 	writeString(h, reply.EphemeralPubKey)
 
-	kInt := new(big.Int).SetBytes(secret[:])
-	K := make([]byte, intLength(kInt))
-	marshalInt(K, kInt)
+	ki := new(big.Int).SetBytes(secret[:])
+	K := make([]byte, intLength(ki))
+	marshalInt(K, ki)
 	h.Write(K)
 
 	return &kexResult{
@@ -510,9 +510,9 @@ func (kex *curve25519sha256) Server(c packetConn, rand io.Reader, magics *handsh
 	writeString(h, kexInit.ClientPubKey)
 	writeString(h, kp.pub[:])
 
-	kInt := new(big.Int).SetBytes(secret[:])
-	K := make([]byte, intLength(kInt))
-	marshalInt(K, kInt)
+	ki := new(big.Int).SetBytes(secret[:])
+	K := make([]byte, intLength(ki))
+	marshalInt(K, ki)
 	h.Write(K)
 
 	H := h.Sum(nil)
diff --git a/vendor/golang.org/x/crypto/ssh/keys.go b/vendor/golang.org/x/crypto/ssh/keys.go
index b682c1741..dadf41ab7 100644
--- a/vendor/golang.org/x/crypto/ssh/keys.go
+++ b/vendor/golang.org/x/crypto/ssh/keys.go
@@ -363,7 +363,7 @@ func (r *rsaPublicKey) CryptoPublicKey() crypto.PublicKey {
 
 type dsaPublicKey dsa.PublicKey
 
-func (r *dsaPublicKey) Type() string {
+func (k *dsaPublicKey) Type() string {
 	return "ssh-dss"
 }
 
@@ -481,12 +481,12 @@ func (k *dsaPrivateKey) Sign(rand io.Reader, data []byte) (*Signature, error) {
 
 type ecdsaPublicKey ecdsa.PublicKey
 
-func (key *ecdsaPublicKey) Type() string {
-	return "ecdsa-sha2-" + key.nistID()
+func (k *ecdsaPublicKey) Type() string {
+	return "ecdsa-sha2-" + k.nistID()
 }
 
-func (key *ecdsaPublicKey) nistID() string {
-	switch key.Params().BitSize {
+func (k *ecdsaPublicKey) nistID() string {
+	switch k.Params().BitSize {
 	case 256:
 		return "nistp256"
 	case 384:
@@ -499,7 +499,7 @@ func (key *ecdsaPublicKey) nistID() string {
 
 type ed25519PublicKey ed25519.PublicKey
 
-func (key ed25519PublicKey) Type() string {
+func (k ed25519PublicKey) Type() string {
 	return KeyAlgoED25519
 }
 
@@ -518,23 +518,23 @@ func parseED25519(in []byte) (out PublicKey, rest []byte, err error) {
 	return (ed25519PublicKey)(key), w.Rest, nil
 }
 
-func (key ed25519PublicKey) Marshal() []byte {
+func (k ed25519PublicKey) Marshal() []byte {
 	w := struct {
 		Name     string
 		KeyBytes []byte
 	}{
 		KeyAlgoED25519,
-		[]byte(key),
+		[]byte(k),
 	}
 	return Marshal(&w)
 }
 
-func (key ed25519PublicKey) Verify(b []byte, sig *Signature) error {
-	if sig.Format != key.Type() {
-		return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, key.Type())
+func (k ed25519PublicKey) Verify(b []byte, sig *Signature) error {
+	if sig.Format != k.Type() {
+		return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, k.Type())
 	}
 
-	edKey := (ed25519.PublicKey)(key)
+	edKey := (ed25519.PublicKey)(k)
 	if ok := ed25519.Verify(edKey, b, sig.Blob); !ok {
 		return errors.New("ssh: signature did not verify")
 	}
@@ -595,9 +595,9 @@ func parseECDSA(in []byte) (out PublicKey, rest []byte, err error) {
 	return (*ecdsaPublicKey)(key), w.Rest, nil
 }
 
-func (key *ecdsaPublicKey) Marshal() []byte {
+func (k *ecdsaPublicKey) Marshal() []byte {
 	// See RFC 5656, section 3.1.
-	keyBytes := elliptic.Marshal(key.Curve, key.X, key.Y)
+	keyBytes := elliptic.Marshal(k.Curve, k.X, k.Y)
 	// ECDSA publickey struct layout should match the struct used by
 	// parseECDSACert in the x/crypto/ssh/agent package.
 	w := struct {
@@ -605,20 +605,20 @@ func (key *ecdsaPublicKey) Marshal() []byte {
 		ID   string
 		Key  []byte
 	}{
-		key.Type(),
-		key.nistID(),
+		k.Type(),
+		k.nistID(),
 		keyBytes,
 	}
 
 	return Marshal(&w)
 }
 
-func (key *ecdsaPublicKey) Verify(data []byte, sig *Signature) error {
-	if sig.Format != key.Type() {
-		return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, key.Type())
+func (k *ecdsaPublicKey) Verify(data []byte, sig *Signature) error {
+	if sig.Format != k.Type() {
+		return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, k.Type())
 	}
 
-	h := ecHash(key.Curve).New()
+	h := ecHash(k.Curve).New()
 	h.Write(data)
 	digest := h.Sum(nil)
 
@@ -635,7 +635,7 @@ func (key *ecdsaPublicKey) Verify(data []byte, sig *Signature) error {
 		return err
 	}
 
-	if ecdsa.Verify((*ecdsa.PublicKey)(key), digest, ecSig.R, ecSig.S) {
+	if ecdsa.Verify((*ecdsa.PublicKey)(k), digest, ecSig.R, ecSig.S) {
 		return nil
 	}
 	return errors.New("ssh: signature did not verify")
@@ -758,7 +758,7 @@ func NewPublicKey(key interface{}) (PublicKey, error) {
 		return (*rsaPublicKey)(key), nil
 	case *ecdsa.PublicKey:
 		if !supportedEllipticCurve(key.Curve) {
-			return nil, errors.New("ssh: only P-256, P-384 and P-521 EC keys are supported.")
+			return nil, errors.New("ssh: only P-256, P-384 and P-521 EC keys are supported")
 		}
 		return (*ecdsaPublicKey)(key), nil
 	case *dsa.PublicKey:
diff --git a/vendor/golang.org/x/crypto/ssh/knownhosts/knownhosts.go b/vendor/golang.org/x/crypto/ssh/knownhosts/knownhosts.go
index ea92b2983..448fc07f8 100644
--- a/vendor/golang.org/x/crypto/ssh/knownhosts/knownhosts.go
+++ b/vendor/golang.org/x/crypto/ssh/knownhosts/knownhosts.go
@@ -108,8 +108,8 @@ func wildcardMatch(pat []byte, str []byte) bool {
 	}
 }
 
-func (l *hostPattern) match(a addr) bool {
-	return wildcardMatch([]byte(l.addr.host), []byte(a.host)) && l.addr.port == a.port
+func (p *hostPattern) match(a addr) bool {
+	return wildcardMatch([]byte(p.addr.host), []byte(a.host)) && p.addr.port == a.port
 }
 
 type keyDBLine struct {
diff --git a/vendor/golang.org/x/crypto/ssh/messages.go b/vendor/golang.org/x/crypto/ssh/messages.go
index e6ecd3afa..08d281173 100644
--- a/vendor/golang.org/x/crypto/ssh/messages.go
+++ b/vendor/golang.org/x/crypto/ssh/messages.go
@@ -23,10 +23,6 @@ const (
 	msgUnimplemented = 3
 	msgDebug         = 4
 	msgNewKeys       = 21
-
-	// Standard authentication messages
-	msgUserAuthSuccess = 52
-	msgUserAuthBanner  = 53
 )
 
 // SSH messages:
@@ -137,6 +133,18 @@ type userAuthFailureMsg struct {
 	PartialSuccess bool
 }
 
+// See RFC 4252, section 5.1
+const msgUserAuthSuccess = 52
+
+// See RFC 4252, section 5.4
+const msgUserAuthBanner = 53
+
+type userAuthBannerMsg struct {
+	Message string `sshtype:"53"`
+	// unused, but required to allow message parsing
+	Language string
+}
+
 // See RFC 4256, section 3.2
 const msgUserAuthInfoRequest = 60
 const msgUserAuthInfoResponse = 61
@@ -154,7 +162,7 @@ const msgChannelOpen = 90
 
 type channelOpenMsg struct {
 	ChanType         string `sshtype:"90"`
-	PeersId          uint32
+	PeersID          uint32
 	PeersWindow      uint32
 	MaxPacketSize    uint32
 	TypeSpecificData []byte `ssh:"rest"`
@@ -165,7 +173,7 @@ const msgChannelData = 94
 
 // Used for debug print outs of packets.
 type channelDataMsg struct {
-	PeersId uint32 `sshtype:"94"`
+	PeersID uint32 `sshtype:"94"`
 	Length  uint32
 	Rest    []byte `ssh:"rest"`
 }
@@ -174,8 +182,8 @@ type channelDataMsg struct {
 const msgChannelOpenConfirm = 91
 
 type channelOpenConfirmMsg struct {
-	PeersId          uint32 `sshtype:"91"`
-	MyId             uint32
+	PeersID          uint32 `sshtype:"91"`
+	MyID             uint32
 	MyWindow         uint32
 	MaxPacketSize    uint32
 	TypeSpecificData []byte `ssh:"rest"`
@@ -185,7 +193,7 @@ type channelOpenConfirmMsg struct {
 const msgChannelOpenFailure = 92
 
 type channelOpenFailureMsg struct {
-	PeersId  uint32 `sshtype:"92"`
+	PeersID  uint32 `sshtype:"92"`
 	Reason   RejectionReason
 	Message  string
 	Language string
@@ -194,7 +202,7 @@ type channelOpenFailureMsg struct {
 const msgChannelRequest = 98
 
 type channelRequestMsg struct {
-	PeersId             uint32 `sshtype:"98"`
+	PeersID             uint32 `sshtype:"98"`
 	Request             string
 	WantReply           bool
 	RequestSpecificData []byte `ssh:"rest"`
@@ -204,28 +212,28 @@ type channelRequestMsg struct {
 const msgChannelSuccess = 99
 
 type channelRequestSuccessMsg struct {
-	PeersId uint32 `sshtype:"99"`
+	PeersID uint32 `sshtype:"99"`
 }
 
 // See RFC 4254, section 5.4.
 const msgChannelFailure = 100
 
 type channelRequestFailureMsg struct {
-	PeersId uint32 `sshtype:"100"`
+	PeersID uint32 `sshtype:"100"`
 }
 
 // See RFC 4254, section 5.3
 const msgChannelClose = 97
 
 type channelCloseMsg struct {
-	PeersId uint32 `sshtype:"97"`
+	PeersID uint32 `sshtype:"97"`
 }
 
 // See RFC 4254, section 5.3
 const msgChannelEOF = 96
 
 type channelEOFMsg struct {
-	PeersId uint32 `sshtype:"96"`
+	PeersID uint32 `sshtype:"96"`
 }
 
 // See RFC 4254, section 4
@@ -255,7 +263,7 @@ type globalRequestFailureMsg struct {
 const msgChannelWindowAdjust = 93
 
 type windowAdjustMsg struct {
-	PeersId         uint32 `sshtype:"93"`
+	PeersID         uint32 `sshtype:"93"`
 	AdditionalBytes uint32
 }
 
diff --git a/vendor/golang.org/x/crypto/ssh/mux.go b/vendor/golang.org/x/crypto/ssh/mux.go
index 27a527c10..f19016270 100644
--- a/vendor/golang.org/x/crypto/ssh/mux.go
+++ b/vendor/golang.org/x/crypto/ssh/mux.go
@@ -278,7 +278,7 @@ func (m *mux) handleChannelOpen(packet []byte) error {
 
 	if msg.MaxPacketSize < minPacketLength || msg.MaxPacketSize > 1<<31 {
 		failMsg := channelOpenFailureMsg{
-			PeersId:  msg.PeersId,
+			PeersID:  msg.PeersID,
 			Reason:   ConnectionFailed,
 			Message:  "invalid request",
 			Language: "en_US.UTF-8",
@@ -287,7 +287,7 @@ func (m *mux) handleChannelOpen(packet []byte) error {
 	}
 
 	c := m.newChannel(msg.ChanType, channelInbound, msg.TypeSpecificData)
-	c.remoteId = msg.PeersId
+	c.remoteId = msg.PeersID
 	c.maxRemotePayload = msg.MaxPacketSize
 	c.remoteWin.add(msg.PeersWindow)
 	m.incomingChannels <- c
@@ -313,7 +313,7 @@ func (m *mux) openChannel(chanType string, extra []byte) (*channel, error) {
 		PeersWindow:      ch.myWindow,
 		MaxPacketSize:    ch.maxIncomingPayload,
 		TypeSpecificData: extra,
-		PeersId:          ch.localId,
+		PeersID:          ch.localId,
 	}
 	if err := m.sendMessage(open); err != nil {
 		return nil, err
diff --git a/vendor/golang.org/x/crypto/ssh/server.go b/vendor/golang.org/x/crypto/ssh/server.go
index 8a78b7ca0..b83d47388 100644
--- a/vendor/golang.org/x/crypto/ssh/server.go
+++ b/vendor/golang.org/x/crypto/ssh/server.go
@@ -95,6 +95,10 @@ type ServerConfig struct {
 	// Note that RFC 4253 section 4.2 requires that this string start with
 	// "SSH-2.0-".
 	ServerVersion string
+
+	// BannerCallback, if present, is called and the return string is sent to
+	// the client after key exchange completed but before authentication.
+	BannerCallback func(conn ConnMetadata) string
 }
 
 // AddHostKey adds a private key as a host key. If an existing host
@@ -252,7 +256,7 @@ func (s *connection) serverHandshake(config *ServerConfig) (*Permissions, error)
 func isAcceptableAlgo(algo string) bool {
 	switch algo {
 	case KeyAlgoRSA, KeyAlgoDSA, KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521, KeyAlgoED25519,
-		CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, CertAlgoECDSA384v01, CertAlgoECDSA521v01:
+		CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, CertAlgoECDSA384v01, CertAlgoECDSA521v01, CertAlgoED25519v01:
 		return true
 	}
 	return false
@@ -312,6 +316,7 @@ func (s *connection) serverAuthenticate(config *ServerConfig) (*Permissions, err
 
 	authFailures := 0
 	var authErrs []error
+	var displayedBanner bool
 
 userAuthLoop:
 	for {
@@ -343,6 +348,20 @@ userAuthLoop:
 		}
 
 		s.user = userAuthReq.User
+
+		if !displayedBanner && config.BannerCallback != nil {
+			displayedBanner = true
+			msg := config.BannerCallback(s)
+			if msg != "" {
+				bannerMsg := &userAuthBannerMsg{
+					Message: msg,
+				}
+				if err := s.transport.writePacket(Marshal(bannerMsg)); err != nil {
+					return nil, err
+				}
+			}
+		}
+
 		perms = nil
 		authErr := errors.New("no auth passed yet")
 
diff --git a/vendor/golang.org/x/crypto/ssh/session.go b/vendor/golang.org/x/crypto/ssh/session.go
index cc06e03f5..d3321f6b7 100644
--- a/vendor/golang.org/x/crypto/ssh/session.go
+++ b/vendor/golang.org/x/crypto/ssh/session.go
@@ -406,7 +406,7 @@ func (s *Session) Wait() error {
 		s.stdinPipeWriter.Close()
 	}
 	var copyError error
-	for _ = range s.copyFuncs {
+	for range s.copyFuncs {
 		if err := <-s.errors; err != nil && copyError == nil {
 			copyError = err
 		}
diff --git a/vendor/golang.org/x/crypto/ssh/terminal/terminal.go b/vendor/golang.org/x/crypto/ssh/terminal/terminal.go
index 18379a935..9a887598f 100644
--- a/vendor/golang.org/x/crypto/ssh/terminal/terminal.go
+++ b/vendor/golang.org/x/crypto/ssh/terminal/terminal.go
@@ -617,7 +617,7 @@ func writeWithCRLF(w io.Writer, buf []byte) (n int, err error) {
 			if _, err = w.Write(crlf); err != nil {
 				return n, err
 			}
-			n += 1
+			n++
 			buf = buf[1:]
 		}
 	}
diff --git a/vendor/golang.org/x/crypto/ssh/terminal/util_windows.go b/vendor/golang.org/x/crypto/ssh/terminal/util_windows.go
index 60979ccd0..92944f3b4 100644
--- a/vendor/golang.org/x/crypto/ssh/terminal/util_windows.go
+++ b/vendor/golang.org/x/crypto/ssh/terminal/util_windows.go
@@ -17,6 +17,8 @@
 package terminal
 
 import (
+	"os"
+
 	"golang.org/x/sys/windows"
 )
 
@@ -71,13 +73,6 @@ func GetSize(fd int) (width, height int, err error) {
 	return int(info.Size.X), int(info.Size.Y), nil
 }
 
-// passwordReader is an io.Reader that reads from a specific Windows HANDLE.
-type passwordReader int
-
-func (r passwordReader) Read(buf []byte) (int, error) {
-	return windows.Read(windows.Handle(r), buf)
-}
-
 // ReadPassword reads a line of input from a terminal without local echo.  This
 // is commonly used for inputting passwords and other sensitive data. The slice
 // returned does not include the \n.
@@ -98,5 +93,5 @@ func ReadPassword(fd int) ([]byte, error) {
 		windows.SetConsoleMode(windows.Handle(fd), old)
 	}()
 
-	return readPasswordLine(passwordReader(fd))
+	return readPasswordLine(os.NewFile(uintptr(fd), "stdin"))
 }
diff --git a/vendor/golang.org/x/crypto/ssh/test/banner_test.go b/vendor/golang.org/x/crypto/ssh/test/banner_test.go
new file mode 100644
index 000000000..d3b21ac76
--- /dev/null
+++ b/vendor/golang.org/x/crypto/ssh/test/banner_test.go
@@ -0,0 +1,32 @@
+// Copyright 2014 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.
+
+// +build darwin dragonfly freebsd linux netbsd openbsd
+
+package test
+
+import (
+	"testing"
+)
+
+func TestBannerCallbackAgainstOpenSSH(t *testing.T) {
+	server := newServer(t)
+	defer server.Shutdown()
+
+	clientConf := clientConfig()
+
+	var receivedBanner string
+	clientConf.BannerCallback = func(message string) error {
+		receivedBanner = message
+		return nil
+	}
+
+	conn := server.Dial(clientConf)
+	defer conn.Close()
+
+	expected := "Server Banner"
+	if receivedBanner != expected {
+		t.Fatalf("got %v; want %v", receivedBanner, expected)
+	}
+}
diff --git a/vendor/golang.org/x/crypto/ssh/test/doc.go b/vendor/golang.org/x/crypto/ssh/test/doc.go
index 3f9b3346d..198f0ca1e 100644
--- a/vendor/golang.org/x/crypto/ssh/test/doc.go
+++ b/vendor/golang.org/x/crypto/ssh/test/doc.go
@@ -2,6 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// This package contains integration tests for the
+// Package test contains integration tests for the
 // golang.org/x/crypto/ssh package.
 package test // import "golang.org/x/crypto/ssh/test"
diff --git a/vendor/golang.org/x/crypto/ssh/test/session_test.go b/vendor/golang.org/x/crypto/ssh/test/session_test.go
index 8238d9d90..9e702effa 100644
--- a/vendor/golang.org/x/crypto/ssh/test/session_test.go
+++ b/vendor/golang.org/x/crypto/ssh/test/session_test.go
@@ -333,21 +333,22 @@ func TestCiphers(t *testing.T) {
 	cipherOrder = append(cipherOrder, "aes128-cbc", "3des-cbc")
 
 	for _, ciph := range cipherOrder {
-		server := newServer(t)
-		defer server.Shutdown()
-		conf := clientConfig()
-		conf.Ciphers = []string{ciph}
-		// Don't fail if sshd doesn't have the cipher.
-		conf.Ciphers = append(conf.Ciphers, cipherOrder...)
-		conn, err := server.TryDial(conf)
-		if err == nil {
-			conn.Close()
-		} else {
-			t.Fatalf("failed for cipher %q", ciph)
-		}
+		t.Run(ciph, func(t *testing.T) {
+			server := newServer(t)
+			defer server.Shutdown()
+			conf := clientConfig()
+			conf.Ciphers = []string{ciph}
+			// Don't fail if sshd doesn't have the cipher.
+			conf.Ciphers = append(conf.Ciphers, cipherOrder...)
+			conn, err := server.TryDial(conf)
+			if err == nil {
+				conn.Close()
+			} else {
+				t.Fatalf("failed for cipher %q", ciph)
+			}
+		})
 	}
 }
-
 func TestMACs(t *testing.T) {
 	var config ssh.Config
 	config.SetDefaults()
diff --git a/vendor/golang.org/x/crypto/ssh/test/test_unix_test.go b/vendor/golang.org/x/crypto/ssh/test/test_unix_test.go
index e673536a8..15b879d35 100644
--- a/vendor/golang.org/x/crypto/ssh/test/test_unix_test.go
+++ b/vendor/golang.org/x/crypto/ssh/test/test_unix_test.go
@@ -25,8 +25,9 @@ import (
 	"golang.org/x/crypto/ssh/testdata"
 )
 
-const sshd_config = `
+const sshdConfig = `
 Protocol 2
+Banner {{.Dir}}/banner
 HostKey {{.Dir}}/id_rsa
 HostKey {{.Dir}}/id_dsa
 HostKey {{.Dir}}/id_ecdsa
@@ -50,7 +51,7 @@ HostbasedAuthentication no
 PubkeyAcceptedKeyTypes=*
 `
 
-var configTmpl = template.Must(template.New("").Parse(sshd_config))
+var configTmpl = template.Must(template.New("").Parse(sshdConfig))
 
 type server struct {
 	t          *testing.T
@@ -256,6 +257,8 @@ func newServer(t *testing.T) *server {
 	}
 	f.Close()
 
+	writeFile(filepath.Join(dir, "banner"), []byte("Server Banner"))
+
 	for k, v := range testdata.PEMBytes {
 		filename := "id_" + k
 		writeFile(filepath.Join(dir, filename), v)
@@ -268,7 +271,7 @@ func newServer(t *testing.T) *server {
 	}
 
 	var authkeys bytes.Buffer
-	for k, _ := range testdata.PEMBytes {
+	for k := range testdata.PEMBytes {
 		authkeys.Write(ssh.MarshalAuthorizedKey(testPublicKeys[k]))
 	}
 	writeFile(filepath.Join(dir, "authorized_keys"), authkeys.Bytes())
diff --git a/vendor/golang.org/x/crypto/ssh/testdata/keys.go b/vendor/golang.org/x/crypto/ssh/testdata/keys.go
index 3b3d26c5b..521b6be97 100644
--- a/vendor/golang.org/x/crypto/ssh/testdata/keys.go
+++ b/vendor/golang.org/x/crypto/ssh/testdata/keys.go
@@ -24,6 +24,27 @@ AwEHoUQDQgAEi9Hdw6KvZcWxfg2IDhA7UkpDtzzt6ZqJXSsFdLd+Kx4S3Sx4cVO+
 6/ZOXRnPmNAlLUqjShUsUBBngG0u2fqEqA==
 -----END EC PRIVATE KEY-----
 `),
+	"ecdsap256": []byte(`-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIAPCE25zK0PQSnsgVcEbM1mbKTASH4pqb5QJajplDwDZoAoGCCqGSM49
+AwEHoUQDQgAEWy8TxGcIHRh5XGpO4dFVfDjeNY+VkgubQrf/eyFJZHxAn1SKraXU
+qJUjTKj1z622OxYtJ5P7s9CfAEVsTzLCzg==
+-----END EC PRIVATE KEY-----
+`),
+	"ecdsap384": []byte(`-----BEGIN EC PRIVATE KEY-----
+MIGkAgEBBDBWfSnMuNKq8J9rQLzzEkx3KAoEohSXqhE/4CdjEYtoU2i22HW80DDS
+qQhYNHRAduygBwYFK4EEACKhZANiAAQWaDMAd0HUd8ZiXCX7mYDDnC54gwH/nG43
+VhCUEYmF7HMZm/B9Yn3GjFk3qYEDEvuF/52+NvUKBKKaLbh32AWxMv0ibcoba4cz
+hL9+hWYhUD9XIUlzMWiZ2y6eBE9PdRI=
+-----END EC PRIVATE KEY-----
+`),
+	"ecdsap521": []byte(`-----BEGIN EC PRIVATE KEY-----
+MIHcAgEBBEIBrkYpQcy8KTVHNiAkjlFZwee90224Bu6wz94R4OBo+Ts0eoAQG7SF
+iaygEDMUbx6kTgXTBcKZ0jrWPKakayNZ/kigBwYFK4EEACOhgYkDgYYABADFuvLV
+UoaCDGHcw5uNfdRIsvaLKuWSpLsl48eWGZAwdNG432GDVKduO+pceuE+8XzcyJb+
+uMv+D2b11Q/LQUcHJwE6fqbm8m3EtDKPsoKs0u/XUJb0JsH4J8lkZzbUTjvGYamn
+FFlRjzoB3Oxu8UQgb+MWPedtH9XYBbg9biz4jJLkXQ==
+-----END EC PRIVATE KEY-----
+`),
 	"rsa": []byte(`-----BEGIN RSA PRIVATE KEY-----
 MIICXAIBAAKBgQC8A6FGHDiWCSREAXCq6yBfNVr0xCVG2CzvktFNRpue+RXrGs/2
 a6ySEJQb3IYquw7HlJgu6fg3WIWhOmHCjfpG0PrL4CRwbqQ2LaPPXhJErWYejcD8
diff --git a/vendor/golang.org/x/crypto/ssh/transport.go b/vendor/golang.org/x/crypto/ssh/transport.go
index ab2b88765..01150eb89 100644
--- a/vendor/golang.org/x/crypto/ssh/transport.go
+++ b/vendor/golang.org/x/crypto/ssh/transport.go
@@ -76,17 +76,17 @@ type connectionState struct {
 // both directions are triggered by reading and writing a msgNewKey packet
 // respectively.
 func (t *transport) prepareKeyChange(algs *algorithms, kexResult *kexResult) error {
-	if ciph, err := newPacketCipher(t.reader.dir, algs.r, kexResult); err != nil {
+	ciph, err := newPacketCipher(t.reader.dir, algs.r, kexResult)
+	if err != nil {
 		return err
-	} else {
-		t.reader.pendingKeyChange <- ciph
 	}
+	t.reader.pendingKeyChange <- ciph
 
-	if ciph, err := newPacketCipher(t.writer.dir, algs.w, kexResult); err != nil {
+	ciph, err = newPacketCipher(t.writer.dir, algs.w, kexResult)
+	if err != nil {
 		return err
-	} else {
-		t.writer.pendingKeyChange <- ciph
 	}
+	t.writer.pendingKeyChange <- ciph
 
 	return nil
 }
@@ -139,7 +139,7 @@ func (s *connectionState) readPacket(r *bufio.Reader) ([]byte, error) {
 			case cipher := <-s.pendingKeyChange:
 				s.packetCipher = cipher
 			default:
-				return nil, errors.New("ssh: got bogus newkeys message.")
+				return nil, errors.New("ssh: got bogus newkeys message")
 			}
 
 		case msgDisconnect:
diff --git a/vendor/golang.org/x/crypto/tea/cipher.go b/vendor/golang.org/x/crypto/tea/cipher.go
index 9c13d12a2..ce223b2c2 100644
--- a/vendor/golang.org/x/crypto/tea/cipher.go
+++ b/vendor/golang.org/x/crypto/tea/cipher.go
@@ -5,7 +5,6 @@
 // Package tea implements the TEA algorithm, as defined in Needham and
 // Wheeler's 1994 technical report, “TEA, a Tiny Encryption Algorithm”. See
 // http://www.cix.co.uk/~klockstone/tea.pdf for details.
-
 package tea
 
 import (
diff --git a/vendor/golang.org/x/crypto/xtea/cipher.go b/vendor/golang.org/x/crypto/xtea/cipher.go
index 108b42635..66ea0df16 100644
--- a/vendor/golang.org/x/crypto/xtea/cipher.go
+++ b/vendor/golang.org/x/crypto/xtea/cipher.go
@@ -69,7 +69,7 @@ func initCipher(c *Cipher, key []byte) {
 
 	// Precalculate the table
 	const delta = 0x9E3779B9
-	var sum uint32 = 0
+	var sum uint32
 
 	// Two rounds of XTEA applied per loop
 	for i := 0; i < numRounds; {