update the golang compiler version and the versions of several dependencies

Signed-off-by: Tariq Ibrahim <tariq181290@gmail.com>

vendor/golang.org/x/oauth2/jws/jws.go

@@ -2,8 +2,16 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Package jws provides encoding and decoding utilities for
-// signed JWS messages.
+// Package jws provides a partial implementation
+// of JSON Web Signature encoding and decoding.
+// It exists to support the golang.org/x/oauth2 package.
+//
+// See RFC 7515.
+//
+// Deprecated: this package is not intended for public use and might be
+// removed in the future. It exists for internal use only.
+// Please switch to another JWS package or copy this package into your own
+// source tree.
 package jws // import "golang.org/x/oauth2/jws"
 
 import (
@@ -64,7 +72,7 @@ func (c *ClaimSet) encode() (string, error) {
 	}
 
 	if len(c.PrivateClaims) == 0 {
-		return base64Encode(b), nil
+		return base64.RawURLEncoding.EncodeToString(b), nil
 	}
 
 	// Marshal private claim set and then append it to b.
@@ -82,7 +90,7 @@ func (c *ClaimSet) encode() (string, error) {
 	}
 	b[len(b)-1] = ','         // Replace closing curly brace with a comma.
 	b = append(b, prv[1:]...) // Append private claims.
-	return base64Encode(b), nil
+	return base64.RawURLEncoding.EncodeToString(b), nil
 }
 
 // Header represents the header for the signed JWS payloads.
@@ -92,6 +100,9 @@ type Header struct {
 
 	// Represents the token type.
 	Typ string `json:"typ"`
+
+	// The optional hint of which key is being used.
+	KeyID string `json:"kid,omitempty"`
 }
 
 func (h *Header) encode() (string, error) {
@@ -99,7 +110,7 @@ func (h *Header) encode() (string, error) {
 	if err != nil {
 		return "", err
 	}
-	return base64Encode(b), nil
+	return base64.RawURLEncoding.EncodeToString(b), nil
 }
 
 // Decode decodes a claim set from a JWS payload.
@@ -110,7 +121,7 @@ func Decode(payload string) (*ClaimSet, error) {
 		// TODO(jbd): Provide more context about the error.
 		return nil, errors.New("jws: invalid token received")
 	}
-	decoded, err := base64Decode(s[1])
+	decoded, err := base64.RawURLEncoding.DecodeString(s[1])
 	if err != nil {
 		return nil, err
 	}
@@ -137,7 +148,7 @@ func EncodeWithSigner(header *Header, c *ClaimSet, sg Signer) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	return fmt.Sprintf("%s.%s", ss, base64Encode(sig)), nil
+	return fmt.Sprintf("%s.%s", ss, base64.RawURLEncoding.EncodeToString(sig)), nil
 }
 
 // Encode encodes a signed JWS with provided header and claim set.
@@ -145,28 +156,27 @@ func EncodeWithSigner(header *Header, c *ClaimSet, sg Signer) (string, error) {
 func Encode(header *Header, c *ClaimSet, key *rsa.PrivateKey) (string, error) {
 	sg := func(data []byte) (sig []byte, err error) {
 		h := sha256.New()
-		h.Write([]byte(data))
+		h.Write(data)
 		return rsa.SignPKCS1v15(rand.Reader, key, crypto.SHA256, h.Sum(nil))
 	}
 	return EncodeWithSigner(header, c, sg)
 }
 
-// base64Encode returns and Base64url encoded version of the input string with any
-// trailing "=" stripped.
-func base64Encode(b []byte) string {
-	return strings.TrimRight(base64.URLEncoding.EncodeToString(b), "=")
-}
-
-// base64Decode decodes the Base64url encoded string
-func base64Decode(s string) ([]byte, error) {
-	// add back missing padding
-	switch len(s) % 4 {
-	case 1:
-		s += "==="
-	case 2:
-		s += "=="
-	case 3:
-		s += "="
+// Verify tests whether the provided JWT token's signature was produced by the private key
+// associated with the supplied public key.
+func Verify(token string, key *rsa.PublicKey) error {
+	parts := strings.Split(token, ".")
+	if len(parts) != 3 {
+		return errors.New("jws: invalid token received, token must have 3 parts")
 	}
-	return base64.URLEncoding.DecodeString(s)
+
+	signedContent := parts[0] + "." + parts[1]
+	signatureString, err := base64.RawURLEncoding.DecodeString(parts[2])
+	if err != nil {
+		return err
+	}
+
+	h := sha256.New()
+	h.Write([]byte(signedContent))
+	return rsa.VerifyPKCS1v15(key, crypto.SHA256, h.Sum(nil), []byte(signatureString))
 }