| Scott Baker | e7144bc | 2019-10-01 14:16:47 -0700 | [diff] [blame] | 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 | } |