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

   1 // Copyright 2014 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package internal
   6
   7 import (
   8         "crypto/rsa"
   9         "crypto/x509"
  10         "encoding/pem"
  11         "errors"
  12         "fmt"
  13 )
  14
  15 // ParseKey converts the binary contents of a private key file
  16 // to an *rsa.PrivateKey. It detects whether the private key is in a
  17 // PEM container or not. If so, it extracts the the private key
  18 // from PEM container before conversion. It only supports PEM
  19 // containers with no passphrase.
  20 func ParseKey(key []byte) (*rsa.PrivateKey, error) {
  21         block, _ := pem.Decode(key)
  22         if block != nil {
  23                 key = block.Bytes
  24         }
  25         parsedKey, err := x509.ParsePKCS8PrivateKey(key)
  26         if err != nil {
  27                 parsedKey, err = x509.ParsePKCS1PrivateKey(key)
  28                 if err != nil {
  29                         return nil, fmt.Errorf("private key should be a PEM or plain PKCS1 or PKCS8; parse error: %v", err)
  30                 }
  31         }
  32         parsed, ok := parsedKey.(*rsa.PrivateKey)
  33         if !ok {
  34                 return nil, errors.New("private key is invalid")
  35         }
  36         return parsed, nil
  37 }