diff --git a/vendor/k8s.io/client-go/util/keyutil/OWNERS b/vendor/k8s.io/client-go/util/keyutil/OWNERS
new file mode 100644
index 0000000..470b7a1
--- /dev/null
+++ b/vendor/k8s.io/client-go/util/keyutil/OWNERS
@@ -0,0 +1,7 @@
+approvers:
+- sig-auth-certificates-approvers
+reviewers:
+- sig-auth-certificates-reviewers
+labels:
+- sig/auth
+
diff --git a/vendor/k8s.io/client-go/util/keyutil/key.go b/vendor/k8s.io/client-go/util/keyutil/key.go
new file mode 100644
index 0000000..83c2c62
--- /dev/null
+++ b/vendor/k8s.io/client-go/util/keyutil/key.go
@@ -0,0 +1,323 @@
+/*
+Copyright 2018 The Kubernetes 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 keyutil contains utilities for managing public/private key pairs.
+package keyutil
+
+import (
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	cryptorand "crypto/rand"
+	"crypto/rsa"
+	"crypto/x509"
+	"encoding/pem"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+)
+
+const (
+	// ECPrivateKeyBlockType is a possible value for pem.Block.Type.
+	ECPrivateKeyBlockType = "EC PRIVATE KEY"
+	// RSAPrivateKeyBlockType is a possible value for pem.Block.Type.
+	RSAPrivateKeyBlockType = "RSA PRIVATE KEY"
+	// PrivateKeyBlockType is a possible value for pem.Block.Type.
+	PrivateKeyBlockType = "PRIVATE KEY"
+	// PublicKeyBlockType is a possible value for pem.Block.Type.
+	PublicKeyBlockType = "PUBLIC KEY"
+)
+
+// MakeEllipticPrivateKeyPEM creates an ECDSA private key
+func MakeEllipticPrivateKeyPEM() ([]byte, error) {
+	privateKey, err := ecdsa.GenerateKey(elliptic.P256(), cryptorand.Reader)
+	if err != nil {
+		return nil, err
+	}
+
+	derBytes, err := x509.MarshalECPrivateKey(privateKey)
+	if err != nil {
+		return nil, err
+	}
+
+	privateKeyPemBlock := &pem.Block{
+		Type:  ECPrivateKeyBlockType,
+		Bytes: derBytes,
+	}
+	return pem.EncodeToMemory(privateKeyPemBlock), nil
+}
+
+// WriteKey writes the pem-encoded key data to keyPath.
+// The key file will be created with file mode 0600.
+// If the key file already exists, it will be overwritten.
+// The parent directory of the keyPath will be created as needed with file mode 0755.
+func WriteKey(keyPath string, data []byte) error {
+	if err := os.MkdirAll(filepath.Dir(keyPath), os.FileMode(0755)); err != nil {
+		return err
+	}
+	return ioutil.WriteFile(keyPath, data, os.FileMode(0600))
+}
+
+// LoadOrGenerateKeyFile looks for a key in the file at the given path. If it
+// can't find one, it will generate a new key and store it there.
+func LoadOrGenerateKeyFile(keyPath string) (data []byte, wasGenerated bool, err error) {
+	loadedData, err := ioutil.ReadFile(keyPath)
+	// Call verifyKeyData to ensure the file wasn't empty/corrupt.
+	if err == nil && verifyKeyData(loadedData) {
+		return loadedData, false, err
+	}
+	if !os.IsNotExist(err) {
+		return nil, false, fmt.Errorf("error loading key from %s: %v", keyPath, err)
+	}
+
+	generatedData, err := MakeEllipticPrivateKeyPEM()
+	if err != nil {
+		return nil, false, fmt.Errorf("error generating key: %v", err)
+	}
+	if err := WriteKey(keyPath, generatedData); err != nil {
+		return nil, false, fmt.Errorf("error writing key to %s: %v", keyPath, err)
+	}
+	return generatedData, true, nil
+}
+
+// MarshalPrivateKeyToPEM converts a known private key type of RSA or ECDSA to
+// a PEM encoded block or returns an error.
+func MarshalPrivateKeyToPEM(privateKey crypto.PrivateKey) ([]byte, error) {
+	switch t := privateKey.(type) {
+	case *ecdsa.PrivateKey:
+		derBytes, err := x509.MarshalECPrivateKey(t)
+		if err != nil {
+			return nil, err
+		}
+		block := &pem.Block{
+			Type:  ECPrivateKeyBlockType,
+			Bytes: derBytes,
+		}
+		return pem.EncodeToMemory(block), nil
+	case *rsa.PrivateKey:
+		block := &pem.Block{
+			Type:  RSAPrivateKeyBlockType,
+			Bytes: x509.MarshalPKCS1PrivateKey(t),
+		}
+		return pem.EncodeToMemory(block), nil
+	default:
+		return nil, fmt.Errorf("private key is not a recognized type: %T", privateKey)
+	}
+}
+
+// PrivateKeyFromFile returns the private key in rsa.PrivateKey or ecdsa.PrivateKey format from a given PEM-encoded file.
+// Returns an error if the file could not be read or if the private key could not be parsed.
+func PrivateKeyFromFile(file string) (interface{}, error) {
+	data, err := ioutil.ReadFile(file)
+	if err != nil {
+		return nil, err
+	}
+	key, err := ParsePrivateKeyPEM(data)
+	if err != nil {
+		return nil, fmt.Errorf("error reading private key file %s: %v", file, err)
+	}
+	return key, nil
+}
+
+// PublicKeysFromFile returns the public keys in rsa.PublicKey or ecdsa.PublicKey format from a given PEM-encoded file.
+// Reads public keys from both public and private key files.
+func PublicKeysFromFile(file string) ([]interface{}, error) {
+	data, err := ioutil.ReadFile(file)
+	if err != nil {
+		return nil, err
+	}
+	keys, err := ParsePublicKeysPEM(data)
+	if err != nil {
+		return nil, fmt.Errorf("error reading public key file %s: %v", file, err)
+	}
+	return keys, nil
+}
+
+// verifyKeyData returns true if the provided data appears to be a valid private key.
+func verifyKeyData(data []byte) bool {
+	if len(data) == 0 {
+		return false
+	}
+	_, err := ParsePrivateKeyPEM(data)
+	return err == nil
+}
+
+// ParsePrivateKeyPEM returns a private key parsed from a PEM block in the supplied data.
+// Recognizes PEM blocks for "EC PRIVATE KEY", "RSA PRIVATE KEY", or "PRIVATE KEY"
+func ParsePrivateKeyPEM(keyData []byte) (interface{}, error) {
+	var privateKeyPemBlock *pem.Block
+	for {
+		privateKeyPemBlock, keyData = pem.Decode(keyData)
+		if privateKeyPemBlock == nil {
+			break
+		}
+
+		switch privateKeyPemBlock.Type {
+		case ECPrivateKeyBlockType:
+			// ECDSA Private Key in ASN.1 format
+			if key, err := x509.ParseECPrivateKey(privateKeyPemBlock.Bytes); err == nil {
+				return key, nil
+			}
+		case RSAPrivateKeyBlockType:
+			// RSA Private Key in PKCS#1 format
+			if key, err := x509.ParsePKCS1PrivateKey(privateKeyPemBlock.Bytes); err == nil {
+				return key, nil
+			}
+		case PrivateKeyBlockType:
+			// RSA or ECDSA Private Key in unencrypted PKCS#8 format
+			if key, err := x509.ParsePKCS8PrivateKey(privateKeyPemBlock.Bytes); err == nil {
+				return key, nil
+			}
+		}
+
+		// tolerate non-key PEM blocks for compatibility with things like "EC PARAMETERS" blocks
+		// originally, only the first PEM block was parsed and expected to be a key block
+	}
+
+	// we read all the PEM blocks and didn't recognize one
+	return nil, fmt.Errorf("data does not contain a valid RSA or ECDSA private key")
+}
+
+// ParsePublicKeysPEM is a helper function for reading an array of rsa.PublicKey or ecdsa.PublicKey from a PEM-encoded byte array.
+// Reads public keys from both public and private key files.
+func ParsePublicKeysPEM(keyData []byte) ([]interface{}, error) {
+	var block *pem.Block
+	keys := []interface{}{}
+	for {
+		// read the next block
+		block, keyData = pem.Decode(keyData)
+		if block == nil {
+			break
+		}
+
+		// test block against parsing functions
+		if privateKey, err := parseRSAPrivateKey(block.Bytes); err == nil {
+			keys = append(keys, &privateKey.PublicKey)
+			continue
+		}
+		if publicKey, err := parseRSAPublicKey(block.Bytes); err == nil {
+			keys = append(keys, publicKey)
+			continue
+		}
+		if privateKey, err := parseECPrivateKey(block.Bytes); err == nil {
+			keys = append(keys, &privateKey.PublicKey)
+			continue
+		}
+		if publicKey, err := parseECPublicKey(block.Bytes); err == nil {
+			keys = append(keys, publicKey)
+			continue
+		}
+
+		// tolerate non-key PEM blocks for backwards compatibility
+		// originally, only the first PEM block was parsed and expected to be a key block
+	}
+
+	if len(keys) == 0 {
+		return nil, fmt.Errorf("data does not contain any valid RSA or ECDSA public keys")
+	}
+	return keys, nil
+}
+
+// parseRSAPublicKey parses a single RSA public key from the provided data
+func parseRSAPublicKey(data []byte) (*rsa.PublicKey, error) {
+	var err error
+
+	// Parse the key
+	var parsedKey interface{}
+	if parsedKey, err = x509.ParsePKIXPublicKey(data); err != nil {
+		if cert, err := x509.ParseCertificate(data); err == nil {
+			parsedKey = cert.PublicKey
+		} else {
+			return nil, err
+		}
+	}
+
+	// Test if parsed key is an RSA Public Key
+	var pubKey *rsa.PublicKey
+	var ok bool
+	if pubKey, ok = parsedKey.(*rsa.PublicKey); !ok {
+		return nil, fmt.Errorf("data doesn't contain valid RSA Public Key")
+	}
+
+	return pubKey, nil
+}
+
+// parseRSAPrivateKey parses a single RSA private key from the provided data
+func parseRSAPrivateKey(data []byte) (*rsa.PrivateKey, error) {
+	var err error
+
+	// Parse the key
+	var parsedKey interface{}
+	if parsedKey, err = x509.ParsePKCS1PrivateKey(data); err != nil {
+		if parsedKey, err = x509.ParsePKCS8PrivateKey(data); err != nil {
+			return nil, err
+		}
+	}
+
+	// Test if parsed key is an RSA Private Key
+	var privKey *rsa.PrivateKey
+	var ok bool
+	if privKey, ok = parsedKey.(*rsa.PrivateKey); !ok {
+		return nil, fmt.Errorf("data doesn't contain valid RSA Private Key")
+	}
+
+	return privKey, nil
+}
+
+// parseECPublicKey parses a single ECDSA public key from the provided data
+func parseECPublicKey(data []byte) (*ecdsa.PublicKey, error) {
+	var err error
+
+	// Parse the key
+	var parsedKey interface{}
+	if parsedKey, err = x509.ParsePKIXPublicKey(data); err != nil {
+		if cert, err := x509.ParseCertificate(data); err == nil {
+			parsedKey = cert.PublicKey
+		} else {
+			return nil, err
+		}
+	}
+
+	// Test if parsed key is an ECDSA Public Key
+	var pubKey *ecdsa.PublicKey
+	var ok bool
+	if pubKey, ok = parsedKey.(*ecdsa.PublicKey); !ok {
+		return nil, fmt.Errorf("data doesn't contain valid ECDSA Public Key")
+	}
+
+	return pubKey, nil
+}
+
+// parseECPrivateKey parses a single ECDSA private key from the provided data
+func parseECPrivateKey(data []byte) (*ecdsa.PrivateKey, error) {
+	var err error
+
+	// Parse the key
+	var parsedKey interface{}
+	if parsedKey, err = x509.ParseECPrivateKey(data); err != nil {
+		return nil, err
+	}
+
+	// Test if parsed key is an ECDSA Private Key
+	var privKey *ecdsa.PrivateKey
+	var ok bool
+	if privKey, ok = parsedKey.(*ecdsa.PrivateKey); !ok {
+		return nil, fmt.Errorf("data doesn't contain valid ECDSA Private Key")
+	}
+
+	return privKey, nil
+}