38 lines
1.0 KiB
Go
38 lines
1.0 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package internal
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import (
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"crypto/rsa"
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"crypto/x509"
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"encoding/pem"
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"errors"
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"fmt"
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)
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// ParseKey converts the binary contents of a private key file
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// to an [*rsa.PrivateKey]. It detects whether the private key is in a
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// PEM container or not. If so, it extracts the private key
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// from PEM container before conversion. It only supports PEM
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// containers with no passphrase.
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func ParseKey(key []byte) (*rsa.PrivateKey, error) {
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block, _ := pem.Decode(key)
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if block != nil {
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key = block.Bytes
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}
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parsedKey, err := x509.ParsePKCS8PrivateKey(key)
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if err != nil {
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parsedKey, err = x509.ParsePKCS1PrivateKey(key)
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if err != nil {
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return nil, fmt.Errorf("private key should be a PEM or plain PKCS1 or PKCS8; parse error: %v", err)
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}
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}
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parsed, ok := parsedKey.(*rsa.PrivateKey)
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if !ok {
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return nil, errors.New("private key is invalid")
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}
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return parsed, nil
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}
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