diff --git a/vendor.conf b/vendor.conf
index 0ca8d4fce4..a8d2137c69 100644
--- a/vendor.conf
+++ b/vendor.conf
@@ -136,7 +136,7 @@ github.com/gogo/protobuf v1.2.0
 github.com/cloudflare/cfssl 1.3.2
 github.com/fernet/fernet-go 1b2437bc582b3cfbb341ee5a29f8ef5b42912ff2
 github.com/google/certificate-transparency-go v1.0.20
-golang.org/x/crypto 0709b304e793a5edb4a2c0145f281ecdc20838a4
+golang.org/x/crypto b7391e95e576cacdcdd422573063bc057239113d
 golang.org/x/time fbb02b2291d28baffd63558aa44b4b56f178d650
 github.com/hashicorp/go-memdb cb9a474f84cc5e41b273b20c6927680b2a8776ad
 github.com/hashicorp/go-immutable-radix 826af9ccf0feeee615d546d69b11f8e98da8c8f1 git://github.com/tonistiigi/go-immutable-radix.git
diff --git a/vendor/golang.org/x/crypto/cryptobyte/builder.go b/vendor/golang.org/x/crypto/cryptobyte/builder.go
index 29b4c76412..ca7b1db5ce 100644
--- a/vendor/golang.org/x/crypto/cryptobyte/builder.go
+++ b/vendor/golang.org/x/crypto/cryptobyte/builder.go
@@ -50,8 +50,14 @@ func NewFixedBuilder(buffer []byte) *Builder {
 	}
 }
 
+// SetError sets the value to be returned as the error from Bytes. Writes
+// performed after calling SetError are ignored.
+func (b *Builder) SetError(err error) {
+	b.err = err
+}
+
 // Bytes returns the bytes written by the builder or an error if one has
-// occurred during during building.
+// occurred during building.
 func (b *Builder) Bytes() ([]byte, error) {
 	if b.err != nil {
 		return nil, b.err
@@ -94,7 +100,7 @@ func (b *Builder) AddBytes(v []byte) {
 	b.add(v...)
 }
 
-// BuilderContinuation is continuation-passing interface for building
+// BuilderContinuation is a continuation-passing interface for building
 // length-prefixed byte sequences. Builder methods for length-prefixed
 // sequences (AddUint8LengthPrefixed etc) will invoke the BuilderContinuation
 // supplied to them. The child builder passed to the continuation can be used
@@ -268,9 +274,11 @@ func (b *Builder) flushChild() {
 		return
 	}
 
-	if !b.fixedSize {
-		b.result = child.result // In case child reallocated result.
+	if b.fixedSize && &b.result[0] != &child.result[0] {
+		panic("cryptobyte: BuilderContinuation reallocated a fixed-size buffer")
 	}
+
+	b.result = child.result
 }
 
 func (b *Builder) add(bytes ...byte) {
@@ -278,7 +286,7 @@ func (b *Builder) add(bytes ...byte) {
 		return
 	}
 	if b.child != nil {
-		panic("attempted write while child is pending")
+		panic("cryptobyte: attempted write while child is pending")
 	}
 	if len(b.result)+len(bytes) < len(bytes) {
 		b.err = errors.New("cryptobyte: length overflow")
@@ -290,6 +298,26 @@ func (b *Builder) add(bytes ...byte) {
 	b.result = append(b.result, bytes...)
 }
 
+// Unwrite rolls back n bytes written directly to the Builder. An attempt by a
+// child builder passed to a continuation to unwrite bytes from its parent will
+// panic.
+func (b *Builder) Unwrite(n int) {
+	if b.err != nil {
+		return
+	}
+	if b.child != nil {
+		panic("cryptobyte: attempted unwrite while child is pending")
+	}
+	length := len(b.result) - b.pendingLenLen - b.offset
+	if length < 0 {
+		panic("cryptobyte: internal error")
+	}
+	if n > length {
+		panic("cryptobyte: attempted to unwrite more than was written")
+	}
+	b.result = b.result[:len(b.result)-n]
+}
+
 // A MarshalingValue marshals itself into a Builder.
 type MarshalingValue interface {
 	// Marshal is called by Builder.AddValue. It receives a pointer to a builder
diff --git a/vendor/golang.org/x/crypto/curve25519/curve25519.go b/vendor/golang.org/x/crypto/curve25519/curve25519.go
index cb8fbc57b9..75f24babb6 100644
--- a/vendor/golang.org/x/crypto/curve25519/curve25519.go
+++ b/vendor/golang.org/x/crypto/curve25519/curve25519.go
@@ -86,7 +86,7 @@ func feFromBytes(dst *fieldElement, src *[32]byte) {
 	h6 := load3(src[20:]) << 7
 	h7 := load3(src[23:]) << 5
 	h8 := load3(src[26:]) << 4
-	h9 := load3(src[29:]) << 2
+	h9 := (load3(src[29:]) & 0x7fffff) << 2
 
 	var carry [10]int64
 	carry[9] = (h9 + 1<<24) >> 25
diff --git a/vendor/golang.org/x/crypto/ocsp/ocsp.go b/vendor/golang.org/x/crypto/ocsp/ocsp.go
index 5edc9c97c2..d297ac92ea 100644
--- a/vendor/golang.org/x/crypto/ocsp/ocsp.go
+++ b/vendor/golang.org/x/crypto/ocsp/ocsp.go
@@ -63,7 +63,7 @@ func (r ResponseStatus) String() string {
 }
 
 // ResponseError is an error that may be returned by ParseResponse to indicate
-// that the response itself is an error, not just that its indicating that a
+// that the response itself is an error, not just that it's indicating that a
 // certificate is revoked, unknown, etc.
 type ResponseError struct {
 	Status ResponseStatus
@@ -487,6 +487,9 @@ func ParseResponseForCert(bytes []byte, cert, issuer *x509.Certificate) (*Respon
 	if err != nil {
 		return nil, err
 	}
+	if len(rest) > 0 {
+		return nil, ParseError("trailing data in OCSP response")
+	}
 
 	if n := len(basicResp.TBSResponseData.Responses); n == 0 || cert == nil && n > 1 {
 		return nil, ParseError("OCSP response contains bad number of responses")
diff --git a/vendor/golang.org/x/crypto/otr/otr.go b/vendor/golang.org/x/crypto/otr/otr.go
index 173b753dbd..29121e9bb6 100644
--- a/vendor/golang.org/x/crypto/otr/otr.go
+++ b/vendor/golang.org/x/crypto/otr/otr.go
@@ -4,6 +4,10 @@
 
 // Package otr implements the Off The Record protocol as specified in
 // http://www.cypherpunks.ca/otr/Protocol-v2-3.1.0.html
+//
+// The version of OTR implemented by this package has been deprecated
+// (https://bugs.otr.im/lib/libotr/issues/140). An implementation of OTRv3 is
+// available at https://github.com/coyim/otr3.
 package otr // import "golang.org/x/crypto/otr"
 
 import (
@@ -637,7 +641,7 @@ func (c *Conversation) serializeDHKey() []byte {
 }
 
 func (c *Conversation) processDHKey(in []byte) (isSame bool, err error) {
-	gy, in, ok := getMPI(in)
+	gy, _, ok := getMPI(in)
 	if !ok {
 		err = errors.New("otr: corrupt DH key message")
 		return
diff --git a/vendor/golang.org/x/crypto/pkcs12/pkcs12.go b/vendor/golang.org/x/crypto/pkcs12/pkcs12.go
index eff9ad3a98..55f7691d48 100644
--- a/vendor/golang.org/x/crypto/pkcs12/pkcs12.go
+++ b/vendor/golang.org/x/crypto/pkcs12/pkcs12.go
@@ -7,6 +7,9 @@
 // This implementation is distilled from https://tools.ietf.org/html/rfc7292
 // and referenced documents. It is intended for decoding P12/PFX-stored
 // certificates and keys for use with the crypto/tls package.
+//
+// This package is frozen. If it's missing functionality you need, consider
+// an alternative like software.sslmate.com/src/go-pkcs12.
 package pkcs12
 
 import (
@@ -100,7 +103,7 @@ func unmarshal(in []byte, out interface{}) error {
 	return nil
 }
 
-// ConvertToPEM converts all "safe bags" contained in pfxData to PEM blocks.
+// ToPEM converts all "safe bags" contained in pfxData to PEM blocks.
 func ToPEM(pfxData []byte, password string) ([]*pem.Block, error) {
 	encodedPassword, err := bmpString(password)
 	if err != nil {
@@ -208,7 +211,7 @@ func convertAttribute(attribute *pkcs12Attribute) (key, value string, err error)
 
 // Decode extracts a certificate and private key from pfxData. This function
 // assumes that there is only one certificate and only one private key in the
-// pfxData.
+// pfxData; if there are more use ToPEM instead.
 func Decode(pfxData []byte, password string) (privateKey interface{}, certificate *x509.Certificate, err error) {
 	encodedPassword, err := bmpString(password)
 	if err != nil {
diff --git a/vendor/golang.org/x/crypto/poly1305/mac_noasm.go b/vendor/golang.org/x/crypto/poly1305/mac_noasm.go
new file mode 100644
index 0000000000..8387d29998
--- /dev/null
+++ b/vendor/golang.org/x/crypto/poly1305/mac_noasm.go
@@ -0,0 +1,11 @@
+// Copyright 2018 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
+
+package poly1305
+
+type mac struct{ macGeneric }
+
+func newMAC(key *[32]byte) mac { return mac{newMACGeneric(key)} }
diff --git a/vendor/golang.org/x/crypto/poly1305/poly1305.go b/vendor/golang.org/x/crypto/poly1305/poly1305.go
index f562fa5712..d076a56235 100644
--- a/vendor/golang.org/x/crypto/poly1305/poly1305.go
+++ b/vendor/golang.org/x/crypto/poly1305/poly1305.go
@@ -2,21 +2,19 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-/*
-Package poly1305 implements Poly1305 one-time message authentication code as
-specified in https://cr.yp.to/mac/poly1305-20050329.pdf.
-
-Poly1305 is a fast, one-time authentication function. It is infeasible for an
-attacker to generate an authenticator for a message without the key. However, a
-key must only be used for a single message. Authenticating two different
-messages with the same key allows an attacker to forge authenticators for other
-messages with the same key.
-
-Poly1305 was originally coupled with AES in order to make Poly1305-AES. AES was
-used with a fixed key in order to generate one-time keys from an nonce.
-However, in this package AES isn't used and the one-time key is specified
-directly.
-*/
+// Package poly1305 implements Poly1305 one-time message authentication code as
+// specified in https://cr.yp.to/mac/poly1305-20050329.pdf.
+//
+// Poly1305 is a fast, one-time authentication function. It is infeasible for an
+// attacker to generate an authenticator for a message without the key. However, a
+// key must only be used for a single message. Authenticating two different
+// messages with the same key allows an attacker to forge authenticators for other
+// messages with the same key.
+//
+// Poly1305 was originally coupled with AES in order to make Poly1305-AES. AES was
+// used with a fixed key in order to generate one-time keys from an nonce.
+// However, in this package AES isn't used and the one-time key is specified
+// directly.
 package poly1305 // import "golang.org/x/crypto/poly1305"
 
 import "crypto/subtle"
@@ -31,3 +29,55 @@ func Verify(mac *[16]byte, m []byte, key *[32]byte) bool {
 	Sum(&tmp, m, key)
 	return subtle.ConstantTimeCompare(tmp[:], mac[:]) == 1
 }
+
+// New returns a new MAC computing an authentication
+// tag of all data written to it with the given key.
+// This allows writing the message progressively instead
+// of passing it as a single slice. Common users should use
+// the Sum function instead.
+//
+// The key must be unique for each message, as authenticating
+// two different messages with the same key allows an attacker
+// to forge messages at will.
+func New(key *[32]byte) *MAC {
+	return &MAC{
+		mac:       newMAC(key),
+		finalized: false,
+	}
+}
+
+// MAC is an io.Writer computing an authentication tag
+// of the data written to it.
+//
+// MAC cannot be used like common hash.Hash implementations,
+// because using a poly1305 key twice breaks its security.
+// Therefore writing data to a running MAC after calling
+// Sum causes it to panic.
+type MAC struct {
+	mac // platform-dependent implementation
+
+	finalized bool
+}
+
+// Size returns the number of bytes Sum will return.
+func (h *MAC) Size() int { return TagSize }
+
+// Write adds more data to the running message authentication code.
+// It never returns an error.
+//
+// It must not be called after the first call of Sum.
+func (h *MAC) Write(p []byte) (n int, err error) {
+	if h.finalized {
+		panic("poly1305: write to MAC after Sum")
+	}
+	return h.mac.Write(p)
+}
+
+// Sum computes the authenticator of all data written to the
+// message authentication code.
+func (h *MAC) Sum(b []byte) []byte {
+	var mac [TagSize]byte
+	h.mac.Sum(&mac)
+	h.finalized = true
+	return append(b, mac[:]...)
+}
diff --git a/vendor/golang.org/x/crypto/poly1305/sum_amd64.go b/vendor/golang.org/x/crypto/poly1305/sum_amd64.go
index 4dd72fe799..2dbf42aa53 100644
--- a/vendor/golang.org/x/crypto/poly1305/sum_amd64.go
+++ b/vendor/golang.org/x/crypto/poly1305/sum_amd64.go
@@ -6,17 +6,63 @@
 
 package poly1305
 
-// This function is implemented in sum_amd64.s
 //go:noescape
-func poly1305(out *[16]byte, m *byte, mlen uint64, key *[32]byte)
+func initialize(state *[7]uint64, key *[32]byte)
+
+//go:noescape
+func update(state *[7]uint64, msg []byte)
+
+//go:noescape
+func finalize(tag *[TagSize]byte, state *[7]uint64)
 
 // Sum generates an authenticator for m using a one-time key and puts the
 // 16-byte result into out. Authenticating two different messages with the same
 // key allows an attacker to forge messages at will.
 func Sum(out *[16]byte, m []byte, key *[32]byte) {
-	var mPtr *byte
-	if len(m) > 0 {
-		mPtr = &m[0]
-	}
-	poly1305(out, mPtr, uint64(len(m)), key)
+	h := newMAC(key)
+	h.Write(m)
+	h.Sum(out)
+}
+
+func newMAC(key *[32]byte) (h mac) {
+	initialize(&h.state, key)
+	return
+}
+
+type mac struct {
+	state [7]uint64 // := uint64{ h0, h1, h2, r0, r1, pad0, pad1 }
+
+	buffer [TagSize]byte
+	offset int
+}
+
+func (h *mac) Write(p []byte) (n int, err error) {
+	n = len(p)
+	if h.offset > 0 {
+		remaining := TagSize - h.offset
+		if n < remaining {
+			h.offset += copy(h.buffer[h.offset:], p)
+			return n, nil
+		}
+		copy(h.buffer[h.offset:], p[:remaining])
+		p = p[remaining:]
+		h.offset = 0
+		update(&h.state, h.buffer[:])
+	}
+	if nn := len(p) - (len(p) % TagSize); nn > 0 {
+		update(&h.state, p[:nn])
+		p = p[nn:]
+	}
+	if len(p) > 0 {
+		h.offset += copy(h.buffer[h.offset:], p)
+	}
+	return n, nil
+}
+
+func (h *mac) Sum(out *[16]byte) {
+	state := h.state
+	if h.offset > 0 {
+		update(&state, h.buffer[:h.offset])
+	}
+	finalize(out, &state)
 }
diff --git a/vendor/golang.org/x/crypto/poly1305/sum_amd64.s b/vendor/golang.org/x/crypto/poly1305/sum_amd64.s
index 2edae63828..7d600f13cc 100644
--- a/vendor/golang.org/x/crypto/poly1305/sum_amd64.s
+++ b/vendor/golang.org/x/crypto/poly1305/sum_amd64.s
@@ -58,20 +58,17 @@ DATA ·poly1305Mask<>+0x00(SB)/8, $0x0FFFFFFC0FFFFFFF
 DATA ·poly1305Mask<>+0x08(SB)/8, $0x0FFFFFFC0FFFFFFC
 GLOBL ·poly1305Mask<>(SB), RODATA, $16
 
-// func poly1305(out *[16]byte, m *byte, mlen uint64, key *[32]key)
-TEXT ·poly1305(SB), $0-32
-	MOVQ out+0(FP), DI
-	MOVQ m+8(FP), SI
-	MOVQ mlen+16(FP), R15
-	MOVQ key+24(FP), AX
+// func update(state *[7]uint64, msg []byte)
+TEXT ·update(SB), $0-32
+	MOVQ state+0(FP), DI
+	MOVQ msg_base+8(FP), SI
+	MOVQ msg_len+16(FP), R15
 
-	MOVQ 0(AX), R11
-	MOVQ 8(AX), R12
-	ANDQ ·poly1305Mask<>(SB), R11   // r0
-	ANDQ ·poly1305Mask<>+8(SB), R12 // r1
-	XORQ R8, R8                    // h0
-	XORQ R9, R9                    // h1
-	XORQ R10, R10                  // h2
+	MOVQ 0(DI), R8   // h0
+	MOVQ 8(DI), R9   // h1
+	MOVQ 16(DI), R10 // h2
+	MOVQ 24(DI), R11 // r0
+	MOVQ 32(DI), R12 // r1
 
 	CMPQ R15, $16
 	JB   bytes_between_0_and_15
@@ -109,16 +106,42 @@ flush_buffer:
 	JMP  multiply
 
 done:
-	MOVQ    R8, AX
-	MOVQ    R9, BX
+	MOVQ R8, 0(DI)
+	MOVQ R9, 8(DI)
+	MOVQ R10, 16(DI)
+	RET
+
+// func initialize(state *[7]uint64, key *[32]byte)
+TEXT ·initialize(SB), $0-16
+	MOVQ state+0(FP), DI
+	MOVQ key+8(FP), SI
+
+	// state[0...7] is initialized with zero
+	MOVOU 0(SI), X0
+	MOVOU 16(SI), X1
+	MOVOU ·poly1305Mask<>(SB), X2
+	PAND  X2, X0
+	MOVOU X0, 24(DI)
+	MOVOU X1, 40(DI)
+	RET
+
+// func finalize(tag *[TagSize]byte, state *[7]uint64)
+TEXT ·finalize(SB), $0-16
+	MOVQ tag+0(FP), DI
+	MOVQ state+8(FP), SI
+
+	MOVQ    0(SI), AX
+	MOVQ    8(SI), BX
+	MOVQ    16(SI), CX
+	MOVQ    AX, R8
+	MOVQ    BX, R9
 	SUBQ    $0xFFFFFFFFFFFFFFFB, AX
 	SBBQ    $0xFFFFFFFFFFFFFFFF, BX
-	SBBQ    $3, R10
+	SBBQ    $3, CX
 	CMOVQCS R8, AX
 	CMOVQCS R9, BX
-	MOVQ    key+24(FP), R8
-	ADDQ    16(R8), AX
-	ADCQ    24(R8), BX
+	ADDQ    40(SI), AX
+	ADCQ    48(SI), BX
 
 	MOVQ AX, 0(DI)
 	MOVQ BX, 8(DI)
diff --git a/vendor/golang.org/x/crypto/poly1305/sum_ref.go b/vendor/golang.org/x/crypto/poly1305/sum_generic.go
similarity index 54%
rename from vendor/golang.org/x/crypto/poly1305/sum_ref.go
rename to vendor/golang.org/x/crypto/poly1305/sum_generic.go
index c4d59bd098..bab76ef0d8 100644
--- a/vendor/golang.org/x/crypto/poly1305/sum_ref.go
+++ b/vendor/golang.org/x/crypto/poly1305/sum_generic.go
@@ -1,4 +1,4 @@
-// Copyright 2012 The Go Authors. All rights reserved.
+// Copyright 2018 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.
 
@@ -6,21 +6,79 @@ package poly1305
 
 import "encoding/binary"
 
+const (
+	msgBlock   = uint32(1 << 24)
+	finalBlock = uint32(0)
+)
+
 // sumGeneric generates an authenticator for msg using a one-time key and
 // puts the 16-byte result into out. This is the generic implementation of
 // Sum and should be called if no assembly implementation is available.
 func sumGeneric(out *[TagSize]byte, msg []byte, key *[32]byte) {
-	var (
-		h0, h1, h2, h3, h4 uint32 // the hash accumulators
-		r0, r1, r2, r3, r4 uint64 // the r part of the key
-	)
+	h := newMACGeneric(key)
+	h.Write(msg)
+	h.Sum(out)
+}
 
-	r0 = uint64(binary.LittleEndian.Uint32(key[0:]) & 0x3ffffff)
-	r1 = uint64((binary.LittleEndian.Uint32(key[3:]) >> 2) & 0x3ffff03)
-	r2 = uint64((binary.LittleEndian.Uint32(key[6:]) >> 4) & 0x3ffc0ff)
-	r3 = uint64((binary.LittleEndian.Uint32(key[9:]) >> 6) & 0x3f03fff)
-	r4 = uint64((binary.LittleEndian.Uint32(key[12:]) >> 8) & 0x00fffff)
+func newMACGeneric(key *[32]byte) (h macGeneric) {
+	h.r[0] = binary.LittleEndian.Uint32(key[0:]) & 0x3ffffff
+	h.r[1] = (binary.LittleEndian.Uint32(key[3:]) >> 2) & 0x3ffff03
+	h.r[2] = (binary.LittleEndian.Uint32(key[6:]) >> 4) & 0x3ffc0ff
+	h.r[3] = (binary.LittleEndian.Uint32(key[9:]) >> 6) & 0x3f03fff
+	h.r[4] = (binary.LittleEndian.Uint32(key[12:]) >> 8) & 0x00fffff
 
+	h.s[0] = binary.LittleEndian.Uint32(key[16:])
+	h.s[1] = binary.LittleEndian.Uint32(key[20:])
+	h.s[2] = binary.LittleEndian.Uint32(key[24:])
+	h.s[3] = binary.LittleEndian.Uint32(key[28:])
+	return
+}
+
+type macGeneric struct {
+	h, r [5]uint32
+	s    [4]uint32
+
+	buffer [TagSize]byte
+	offset int
+}
+
+func (h *macGeneric) Write(p []byte) (n int, err error) {
+	n = len(p)
+	if h.offset > 0 {
+		remaining := TagSize - h.offset
+		if n < remaining {
+			h.offset += copy(h.buffer[h.offset:], p)
+			return n, nil
+		}
+		copy(h.buffer[h.offset:], p[:remaining])
+		p = p[remaining:]
+		h.offset = 0
+		updateGeneric(h.buffer[:], msgBlock, &(h.h), &(h.r))
+	}
+	if nn := len(p) - (len(p) % TagSize); nn > 0 {
+		updateGeneric(p, msgBlock, &(h.h), &(h.r))
+		p = p[nn:]
+	}
+	if len(p) > 0 {
+		h.offset += copy(h.buffer[h.offset:], p)
+	}
+	return n, nil
+}
+
+func (h *macGeneric) Sum(out *[16]byte) {
+	H, R := h.h, h.r
+	if h.offset > 0 {
+		var buffer [TagSize]byte
+		copy(buffer[:], h.buffer[:h.offset])
+		buffer[h.offset] = 1 // invariant: h.offset < TagSize
+		updateGeneric(buffer[:], finalBlock, &H, &R)
+	}
+	finalizeGeneric(out, &H, &(h.s))
+}
+
+func updateGeneric(msg []byte, flag uint32, h, r *[5]uint32) {
+	h0, h1, h2, h3, h4 := h[0], h[1], h[2], h[3], h[4]
+	r0, r1, r2, r3, r4 := uint64(r[0]), uint64(r[1]), uint64(r[2]), uint64(r[3]), uint64(r[4])
 	R1, R2, R3, R4 := r1*5, r2*5, r3*5, r4*5
 
 	for len(msg) >= TagSize {
@@ -29,7 +87,7 @@ func sumGeneric(out *[TagSize]byte, msg []byte, key *[32]byte) {
 		h1 += (binary.LittleEndian.Uint32(msg[3:]) >> 2) & 0x3ffffff
 		h2 += (binary.LittleEndian.Uint32(msg[6:]) >> 4) & 0x3ffffff
 		h3 += (binary.LittleEndian.Uint32(msg[9:]) >> 6) & 0x3ffffff
-		h4 += (binary.LittleEndian.Uint32(msg[12:]) >> 8) | (1 << 24)
+		h4 += (binary.LittleEndian.Uint32(msg[12:]) >> 8) | flag
 
 		// h *= r
 		d0 := (uint64(h0) * r0) + (uint64(h1) * R4) + (uint64(h2) * R3) + (uint64(h3) * R2) + (uint64(h4) * R1)
@@ -52,36 +110,11 @@ func sumGeneric(out *[TagSize]byte, msg []byte, key *[32]byte) {
 		msg = msg[TagSize:]
 	}
 
-	if len(msg) > 0 {
-		var block [TagSize]byte
-		off := copy(block[:], msg)
-		block[off] = 0x01
+	h[0], h[1], h[2], h[3], h[4] = h0, h1, h2, h3, h4
+}
 
-		// h += msg
-		h0 += binary.LittleEndian.Uint32(block[0:]) & 0x3ffffff
-		h1 += (binary.LittleEndian.Uint32(block[3:]) >> 2) & 0x3ffffff
-		h2 += (binary.LittleEndian.Uint32(block[6:]) >> 4) & 0x3ffffff
-		h3 += (binary.LittleEndian.Uint32(block[9:]) >> 6) & 0x3ffffff
-		h4 += (binary.LittleEndian.Uint32(block[12:]) >> 8)
-
-		// h *= r
-		d0 := (uint64(h0) * r0) + (uint64(h1) * R4) + (uint64(h2) * R3) + (uint64(h3) * R2) + (uint64(h4) * R1)
-		d1 := (d0 >> 26) + (uint64(h0) * r1) + (uint64(h1) * r0) + (uint64(h2) * R4) + (uint64(h3) * R3) + (uint64(h4) * R2)
-		d2 := (d1 >> 26) + (uint64(h0) * r2) + (uint64(h1) * r1) + (uint64(h2) * r0) + (uint64(h3) * R4) + (uint64(h4) * R3)
-		d3 := (d2 >> 26) + (uint64(h0) * r3) + (uint64(h1) * r2) + (uint64(h2) * r1) + (uint64(h3) * r0) + (uint64(h4) * R4)
-		d4 := (d3 >> 26) + (uint64(h0) * r4) + (uint64(h1) * r3) + (uint64(h2) * r2) + (uint64(h3) * r1) + (uint64(h4) * r0)
-
-		// h %= p
-		h0 = uint32(d0) & 0x3ffffff
-		h1 = uint32(d1) & 0x3ffffff
-		h2 = uint32(d2) & 0x3ffffff
-		h3 = uint32(d3) & 0x3ffffff
-		h4 = uint32(d4) & 0x3ffffff
-
-		h0 += uint32(d4>>26) * 5
-		h1 += h0 >> 26
-		h0 = h0 & 0x3ffffff
-	}
+func finalizeGeneric(out *[TagSize]byte, h *[5]uint32, s *[4]uint32) {
+	h0, h1, h2, h3, h4 := h[0], h[1], h[2], h[3], h[4]
 
 	// h %= p reduction
 	h2 += h1 >> 26
@@ -123,13 +156,13 @@ func sumGeneric(out *[TagSize]byte, msg []byte, key *[32]byte) {
 
 	// s: the s part of the key
 	// tag = (h + s) % (2^128)
-	t := uint64(h0) + uint64(binary.LittleEndian.Uint32(key[16:]))
+	t := uint64(h0) + uint64(s[0])
 	h0 = uint32(t)
-	t = uint64(h1) + uint64(binary.LittleEndian.Uint32(key[20:])) + (t >> 32)
+	t = uint64(h1) + uint64(s[1]) + (t >> 32)
 	h1 = uint32(t)
-	t = uint64(h2) + uint64(binary.LittleEndian.Uint32(key[24:])) + (t >> 32)
+	t = uint64(h2) + uint64(s[2]) + (t >> 32)
 	h2 = uint32(t)
-	t = uint64(h3) + uint64(binary.LittleEndian.Uint32(key[28:])) + (t >> 32)
+	t = uint64(h3) + uint64(s[3]) + (t >> 32)
 	h3 = uint32(t)
 
 	binary.LittleEndian.PutUint32(out[0:], h0)
diff --git a/vendor/golang.org/x/crypto/poly1305/sum_noasm.go b/vendor/golang.org/x/crypto/poly1305/sum_noasm.go
index 751eec5274..fcdef46ab6 100644
--- a/vendor/golang.org/x/crypto/poly1305/sum_noasm.go
+++ b/vendor/golang.org/x/crypto/poly1305/sum_noasm.go
@@ -10,5 +10,7 @@ package poly1305
 // 16-byte result into out. Authenticating two different messages with the same
 // key allows an attacker to forge messages at will.
 func Sum(out *[TagSize]byte, msg []byte, key *[32]byte) {
-	sumGeneric(out, msg, key)
+	h := newMAC(key)
+	h.Write(msg)
+	h.Sum(out)
 }
diff --git a/vendor/golang.org/x/crypto/poly1305/sum_s390x.go b/vendor/golang.org/x/crypto/poly1305/sum_s390x.go
index 7a266cece4..ec99e07e9f 100644
--- a/vendor/golang.org/x/crypto/poly1305/sum_s390x.go
+++ b/vendor/golang.org/x/crypto/poly1305/sum_s390x.go
@@ -6,16 +6,9 @@
 
 package poly1305
 
-// hasVectorFacility reports whether the machine supports
-// the vector facility (vx).
-func hasVectorFacility() bool
-
-// hasVMSLFacility reports whether the machine supports
-// Vector Multiply Sum Logical (VMSL).
-func hasVMSLFacility() bool
-
-var hasVX = hasVectorFacility()
-var hasVMSL = hasVMSLFacility()
+import (
+	"golang.org/x/sys/cpu"
+)
 
 // poly1305vx is an assembly implementation of Poly1305 that uses vector
 // instructions. It must only be called if the vector facility (vx) is
@@ -33,12 +26,12 @@ func poly1305vmsl(out *[16]byte, m *byte, mlen uint64, key *[32]byte)
 // 16-byte result into out. Authenticating two different messages with the same
 // key allows an attacker to forge messages at will.
 func Sum(out *[16]byte, m []byte, key *[32]byte) {
-	if hasVX {
+	if cpu.S390X.HasVX {
 		var mPtr *byte
 		if len(m) > 0 {
 			mPtr = &m[0]
 		}
-		if hasVMSL && len(m) > 256 {
+		if cpu.S390X.HasVXE && len(m) > 256 {
 			poly1305vmsl(out, mPtr, uint64(len(m)), key)
 		} else {
 			poly1305vx(out, mPtr, uint64(len(m)), key)
diff --git a/vendor/golang.org/x/crypto/poly1305/sum_s390x.s b/vendor/golang.org/x/crypto/poly1305/sum_s390x.s
index 356c07a6c2..ca5a309d86 100644
--- a/vendor/golang.org/x/crypto/poly1305/sum_s390x.s
+++ b/vendor/golang.org/x/crypto/poly1305/sum_s390x.s
@@ -376,25 +376,3 @@ b1:
 
 	MOVD $0, R3
 	BR   multiply
-
-TEXT ·hasVectorFacility(SB), NOSPLIT, $24-1
-	MOVD  $x-24(SP), R1
-	XC    $24, 0(R1), 0(R1) // clear the storage
-	MOVD  $2, R0            // R0 is the number of double words stored -1
-	WORD  $0xB2B01000       // STFLE 0(R1)
-	XOR   R0, R0            // reset the value of R0
-	MOVBZ z-8(SP), R1
-	AND   $0x40, R1
-	BEQ   novector
-
-vectorinstalled:
-	// check if the vector instruction has been enabled
-	VLEIB  $0, $0xF, V16
-	VLGVB  $0, V16, R1
-	CMPBNE R1, $0xF, novector
-	MOVB   $1, ret+0(FP)      // have vx
-	RET
-
-novector:
-	MOVB $0, ret+0(FP) // no vx
-	RET
diff --git a/vendor/golang.org/x/crypto/poly1305/sum_vmsl_s390x.s b/vendor/golang.org/x/crypto/poly1305/sum_vmsl_s390x.s
index e548020b14..e60bbc1d7f 100644
--- a/vendor/golang.org/x/crypto/poly1305/sum_vmsl_s390x.s
+++ b/vendor/golang.org/x/crypto/poly1305/sum_vmsl_s390x.s
@@ -907,25 +907,3 @@ square:
 	MULTIPLY(H0_0, H1_0, H2_0, H0_1, H1_1, H2_1, R_0, R_1, R_2, R5_1, R5_2, M0, M1, M2, M3, M4, M5, T_0, T_1, T_2, T_3, T_4, T_5, T_6, T_7, T_8, T_9)
 	REDUCE2(H0_0, H1_0, H2_0, M0, M1, M2, M3, M4, T_9, T_10, H0_1, M5)
 	BR next
-
-TEXT ·hasVMSLFacility(SB), NOSPLIT, $24-1
-	MOVD  $x-24(SP), R1
-	XC    $24, 0(R1), 0(R1) // clear the storage
-	MOVD  $2, R0            // R0 is the number of double words stored -1
-	WORD  $0xB2B01000       // STFLE 0(R1)
-	XOR   R0, R0            // reset the value of R0
-	MOVBZ z-8(SP), R1
-	AND   $0x01, R1
-	BEQ   novmsl
-
-vectorinstalled:
-	// check if the vector instruction has been enabled
-	VLEIB  $0, $0xF, V16
-	VLGVB  $0, V16, R1
-	CMPBNE R1, $0xF, novmsl
-	MOVB   $1, ret+0(FP)    // have vx
-	RET
-
-novmsl:
-	MOVB $0, ret+0(FP) // no vx
-	RET
diff --git a/vendor/golang.org/x/crypto/salsa20/salsa/salsa20_amd64.go b/vendor/golang.org/x/crypto/salsa20/salsa/salsa20_amd64.go
index f9269c3848..656e8df942 100644
--- a/vendor/golang.org/x/crypto/salsa20/salsa/salsa20_amd64.go
+++ b/vendor/golang.org/x/crypto/salsa20/salsa/salsa20_amd64.go
@@ -6,10 +6,9 @@
 
 package salsa
 
-// This function is implemented in salsa2020_amd64.s.
-
 //go:noescape
 
+// salsa2020XORKeyStream is implemented in salsa20_amd64.s.
 func salsa2020XORKeyStream(out, in *byte, n uint64, nonce, key *byte)
 
 // XORKeyStream crypts bytes from in to out using the given key and counters.
diff --git a/vendor/golang.org/x/crypto/salsa20/salsa/salsa2020_amd64.s b/vendor/golang.org/x/crypto/salsa20/salsa/salsa20_amd64.s
similarity index 99%
rename from vendor/golang.org/x/crypto/salsa20/salsa/salsa2020_amd64.s
rename to vendor/golang.org/x/crypto/salsa20/salsa/salsa20_amd64.s
index 22afbdcadc..18085d2e8c 100644
--- a/vendor/golang.org/x/crypto/salsa20/salsa/salsa2020_amd64.s
+++ b/vendor/golang.org/x/crypto/salsa20/salsa/salsa20_amd64.s
@@ -99,30 +99,24 @@ TEXT ·salsa2020XORKeyStream(SB),0,$456-40 // frame = 424 + 32 byte alignment
 	MOVL  36 (SP),CX
 	MOVL DX,288(SP)
 	MOVL CX,304(SP)
-	ADDQ $1,DX
 	SHLQ $32,CX
 	ADDQ CX,DX
+	ADDQ $1,DX
 	MOVQ DX,CX
 	SHRQ $32,CX
 	MOVL DX, 292 (SP)
 	MOVL CX, 308 (SP)
 	ADDQ $1,DX
-	SHLQ $32,CX
-	ADDQ CX,DX
 	MOVQ DX,CX
 	SHRQ $32,CX
 	MOVL DX, 296 (SP)
 	MOVL CX, 312 (SP)
 	ADDQ $1,DX
-	SHLQ $32,CX
-	ADDQ CX,DX
 	MOVQ DX,CX
 	SHRQ $32,CX
 	MOVL DX, 300 (SP)
 	MOVL CX, 316 (SP)
 	ADDQ $1,DX
-	SHLQ $32,CX
-	ADDQ CX,DX
 	MOVQ DX,CX
 	SHRQ $32,CX
 	MOVL DX,16(SP)
diff --git a/vendor/golang.org/x/crypto/salsa20/salsa/salsa20_noasm.go b/vendor/golang.org/x/crypto/salsa20/salsa/salsa20_noasm.go
new file mode 100644
index 0000000000..8a46bd2b3a
--- /dev/null
+++ b/vendor/golang.org/x/crypto/salsa20/salsa/salsa20_noasm.go
@@ -0,0 +1,14 @@
+// Copyright 2019 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 salsa
+
+// XORKeyStream crypts bytes from in to out using the given key and counters.
+// In and out must overlap entirely or not at all. Counter
+// contains the raw salsa20 counter bytes (both nonce and block counter).
+func XORKeyStream(out, in []byte, counter *[16]byte, key *[32]byte) {
+	genericXORKeyStream(out, in, counter, key)
+}
diff --git a/vendor/golang.org/x/crypto/salsa20/salsa/salsa20_ref.go b/vendor/golang.org/x/crypto/salsa20/salsa/salsa20_ref.go
index 22126d17c4..68169c6d68 100644
--- a/vendor/golang.org/x/crypto/salsa20/salsa/salsa20_ref.go
+++ b/vendor/golang.org/x/crypto/salsa20/salsa/salsa20_ref.go
@@ -2,8 +2,6 @@
 // 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 salsa
 
 const rounds = 20
@@ -202,10 +200,9 @@ func core(out *[64]byte, in *[16]byte, k *[32]byte, c *[16]byte) {
 	out[63] = byte(x15 >> 24)
 }
 
-// XORKeyStream crypts bytes from in to out using the given key and counters.
-// In and out must overlap entirely or not at all. Counter
-// contains the raw salsa20 counter bytes (both nonce and block counter).
-func XORKeyStream(out, in []byte, counter *[16]byte, key *[32]byte) {
+// genericXORKeyStream is the generic implementation of XORKeyStream to be used
+// when no assembly implementation is available.
+func genericXORKeyStream(out, in []byte, counter *[16]byte, key *[32]byte) {
 	var block [64]byte
 	var counterCopy [16]byte
 	copy(counterCopy[:], counter[:])
diff --git a/vendor/golang.org/x/crypto/ssh/terminal/terminal.go b/vendor/golang.org/x/crypto/ssh/terminal/terminal.go
index 9a887598ff..9d666ffcf0 100644
--- a/vendor/golang.org/x/crypto/ssh/terminal/terminal.go
+++ b/vendor/golang.org/x/crypto/ssh/terminal/terminal.go
@@ -159,6 +159,10 @@ func bytesToKey(b []byte, pasteActive bool) (rune, []byte) {
 			return keyClearScreen, b[1:]
 		case 23: // ^W
 			return keyDeleteWord, b[1:]
+		case 14: // ^N
+			return keyDown, b[1:]
+		case 16: // ^P
+			return keyUp, b[1:]
 		}
 	}
 
diff --git a/vendor/golang.org/x/crypto/ssh/terminal/util.go b/vendor/golang.org/x/crypto/ssh/terminal/util.go
index 731c89a284..3911040840 100644
--- a/vendor/golang.org/x/crypto/ssh/terminal/util.go
+++ b/vendor/golang.org/x/crypto/ssh/terminal/util.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.
 
-// +build darwin dragonfly freebsd linux,!appengine netbsd openbsd
+// +build aix darwin dragonfly freebsd linux,!appengine netbsd openbsd
 
 // Package terminal provides support functions for dealing with terminals, as
 // commonly found on UNIX systems.
@@ -25,7 +25,7 @@ type State struct {
 	termios unix.Termios
 }
 
-// IsTerminal returns true if the given file descriptor is a terminal.
+// IsTerminal returns whether the given file descriptor is a terminal.
 func IsTerminal(fd int) bool {
 	_, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
 	return err == nil
diff --git a/vendor/golang.org/x/crypto/ssh/terminal/util_aix.go b/vendor/golang.org/x/crypto/ssh/terminal/util_aix.go
new file mode 100644
index 0000000000..dfcd627859
--- /dev/null
+++ b/vendor/golang.org/x/crypto/ssh/terminal/util_aix.go
@@ -0,0 +1,12 @@
+// Copyright 2018 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 aix
+
+package terminal
+
+import "golang.org/x/sys/unix"
+
+const ioctlReadTermios = unix.TCGETS
+const ioctlWriteTermios = unix.TCSETS
diff --git a/vendor/golang.org/x/crypto/ssh/terminal/util_plan9.go b/vendor/golang.org/x/crypto/ssh/terminal/util_plan9.go
index 799f049f04..9317ac7ede 100644
--- a/vendor/golang.org/x/crypto/ssh/terminal/util_plan9.go
+++ b/vendor/golang.org/x/crypto/ssh/terminal/util_plan9.go
@@ -21,7 +21,7 @@ import (
 
 type State struct{}
 
-// IsTerminal returns true if the given file descriptor is a terminal.
+// IsTerminal returns whether the given file descriptor is a terminal.
 func IsTerminal(fd int) bool {
 	return false
 }
diff --git a/vendor/golang.org/x/crypto/ssh/terminal/util_solaris.go b/vendor/golang.org/x/crypto/ssh/terminal/util_solaris.go
index 9e41b9f43f..3d5f06a9f0 100644
--- a/vendor/golang.org/x/crypto/ssh/terminal/util_solaris.go
+++ b/vendor/golang.org/x/crypto/ssh/terminal/util_solaris.go
@@ -17,7 +17,7 @@ type State struct {
 	termios unix.Termios
 }
 
-// IsTerminal returns true if the given file descriptor is a terminal.
+// IsTerminal returns whether the given file descriptor is a terminal.
 func IsTerminal(fd int) bool {
 	_, err := unix.IoctlGetTermio(fd, unix.TCGETA)
 	return err == nil
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 8618955df7..5cfdf8f3f0 100644
--- a/vendor/golang.org/x/crypto/ssh/terminal/util_windows.go
+++ b/vendor/golang.org/x/crypto/ssh/terminal/util_windows.go
@@ -26,7 +26,7 @@ type State struct {
 	mode uint32
 }
 
-// IsTerminal returns true if the given file descriptor is a terminal.
+// IsTerminal returns whether the given file descriptor is a terminal.
 func IsTerminal(fd int) bool {
 	var st uint32
 	err := windows.GetConsoleMode(windows.Handle(fd), &st)
@@ -64,13 +64,15 @@ func Restore(fd int, state *State) error {
 	return windows.SetConsoleMode(windows.Handle(fd), state.mode)
 }
 
-// GetSize returns the dimensions of the given terminal.
+// GetSize returns the visible dimensions of the given terminal.
+//
+// These dimensions don't include any scrollback buffer height.
 func GetSize(fd int) (width, height int, err error) {
 	var info windows.ConsoleScreenBufferInfo
 	if err := windows.GetConsoleScreenBufferInfo(windows.Handle(fd), &info); err != nil {
 		return 0, 0, err
 	}
-	return int(info.Size.X), int(info.Size.Y), nil
+	return int(info.Window.Right - info.Window.Left + 1), int(info.Window.Bottom - info.Window.Top + 1), nil
 }
 
 // ReadPassword reads a line of input from a terminal without local echo.  This