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


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

// Copyright 2014 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.

package internal

import (
    "crypto/rsa"
    "crypto/x509"
    "encoding/pem"
    "errors"
    "fmt"
)

// ParseKey converts the binary contents of a private key file
// to an *rsa.PrivateKey. It detects whether the private key is in a
// PEM container or not. If so, it extracts the the private key
// from PEM container before conversion. It only supports PEM
// containers with no passphrase.
func ParseKey(key []byte) (*rsa.PrivateKey, error) {
    block, _ := pem.Decode(key)
    if block != nil {
        key = block.Bytes
    }
    parsedKey, err := x509.ParsePKCS8PrivateKey(key)
    if err != nil {
        parsedKey, err = x509.ParsePKCS1PrivateKey(key)
        if err != nil {
            return nil, fmt.Errorf("private key should be a PEM or plain PKCS1 or PKCS8; parse error: %v", err)
        }
    }
    parsed, ok := parsedKey.(*rsa.PrivateKey)
    if !ok {
        return nil, errors.New("private key is invalid")
    }
    return parsed, nil
}