Update/delete vendor files

Refreshed / updated vendor dependencies

Tested with "make".

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

gateway/vendor/github.com/nats-io/nkeys/keypair.go

@@ -0,0 +1,117 @@
+// Copyright 2018 The NATS Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package nkeys
+
+import (
+	"bytes"
+	"crypto/rand"
+	"io"
+
+	"golang.org/x/crypto/ed25519"
+)
+
+// kp is the internal struct for a kepypair using seed.
+type kp struct {
+	seed []byte
+}
+
+// CreatePair will create a KeyPair based on the rand entropy and a type/prefix byte. rand can be nil.
+func CreatePair(prefix PrefixByte) (KeyPair, error) {
+	var rawSeed [32]byte
+
+	_, err := io.ReadFull(rand.Reader, rawSeed[:])
+	if err != nil {
+		return nil, err
+	}
+
+	seed, err := EncodeSeed(prefix, rawSeed[:])
+	if err != nil {
+		return nil, err
+	}
+	return &kp{seed}, nil
+}
+
+// rawSeed will return the raw, decoded 64 byte seed.
+func (pair *kp) rawSeed() ([]byte, error) {
+	_, raw, err := DecodeSeed(pair.seed)
+	return raw, err
+}
+
+// keys will return a 32 byte public key and a 64 byte private key utilizing the seed.
+func (pair *kp) keys() (ed25519.PublicKey, ed25519.PrivateKey, error) {
+	raw, err := pair.rawSeed()
+	if err != nil {
+		return nil, nil, err
+	}
+	return ed25519.GenerateKey(bytes.NewReader(raw))
+}
+
+// Wipe will randomize the contents of the seed key
+func (pair *kp) Wipe() {
+	io.ReadFull(rand.Reader, pair.seed)
+	pair.seed = nil
+}
+
+// Seed will return the encoded seed.
+func (pair *kp) Seed() ([]byte, error) {
+	return pair.seed, nil
+}
+
+// PublicKey will return the encoded public key associated with the KeyPair.
+// All KeyPairs have a public key.
+func (pair *kp) PublicKey() (string, error) {
+	public, raw, err := DecodeSeed(pair.seed)
+	if err != nil {
+		return "", err
+	}
+	pub, _, err := ed25519.GenerateKey(bytes.NewReader(raw))
+	if err != nil {
+		return "", err
+	}
+	pk, err := Encode(public, pub)
+	if err != nil {
+		return "", err
+	}
+	return string(pk), nil
+}
+
+// PrivateKey will return the encoded private key for KeyPair.
+func (pair *kp) PrivateKey() ([]byte, error) {
+	_, priv, err := pair.keys()
+	if err != nil {
+		return nil, err
+	}
+	return Encode(PrefixBytePrivate, priv)
+}
+
+// Sign will sign the input with KeyPair's private key.
+func (pair *kp) Sign(input []byte) ([]byte, error) {
+	_, priv, err := pair.keys()
+	if err != nil {
+		return nil, err
+	}
+	return ed25519.Sign(priv, input), nil
+}
+
+// Verify will verify the input against a signature utilizing the public key.
+func (pair *kp) Verify(input []byte, sig []byte) error {
+	pub, _, err := pair.keys()
+	if err != nil {
+		return err
+	}
+	if !ed25519.Verify(pub, input, sig) {
+		return ErrInvalidSignature
+	}
+	return nil
+}