oauth2.go

Documentation: golang.org/x/oauth2/internal

     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 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  }
    38
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