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//
// Copyright (c) SAS Institute Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package certloader
import (
"bytes"
"crypto"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"io"
"os"
"strings"
"golang.org/x/crypto/openpgp"
"golang.org/x/crypto/openpgp/armor"
"golang.org/x/crypto/openpgp/packet"
"github.com/sassoftware/relic/v7/lib/passprompt"
)
// Parse and decrypt a private key. It can be a RSA or ECDA key in PKCS#1 or
// PKCS#8 format and DER or PEM encoding, or it can be a PGP private key. If
// the private key is encrypted then the given prompter will be invoked to ask
// for the passphrase, if provided.
func ParseAnyPrivateKey(blob []byte, prompt passprompt.PasswordGetter) (crypto.PrivateKey, error) {
if bytes.HasPrefix(blob, []byte("-----BEGIN PGP")) {
return parsePgpPrivateKey(blob, prompt)
} else if bytes.HasPrefix(blob, []byte("-----BEGIN")) {
var block *pem.Block
for {
block, blob = pem.Decode(blob)
if block == nil {
break
} else if block.Type == "PRIVATE KEY" || strings.HasSuffix(block.Type, " PRIVATE KEY") {
return parsePemPrivateKey(block, prompt)
}
}
return nil, errors.New("failed to find any private keys in PEM data")
} else if blob[0] == asn1Magic {
return parsePrivateKey(blob)
} else if blob[0]&0x80 != 0 {
return parsePgpPrivateKey(blob, prompt)
} else {
return nil, errors.New("unrecognized private key format")
}
}
func parsePemPrivateKey(block *pem.Block, prompt passprompt.PasswordGetter) (crypto.PrivateKey, error) {
if !x509.IsEncryptedPEMBlock(block) { //nolint:staticcheck
return parsePrivateKey(block.Bytes)
}
if prompt == nil {
return nil, errors.New("private key is encrypted and no password was provided")
}
for {
password, err := prompt.GetPasswd("Password for private key: ")
if err != nil {
return nil, err
} else if password == "" {
return nil, errors.New("aborted")
}
keyblob, err := x509.DecryptPEMBlock(block, []byte(password)) //nolint:staticcheck
if err == x509.IncorrectPasswordError {
continue
} else if err != nil {
return nil, err
} else {
return parsePrivateKey(keyblob)
}
}
}
func parsePgpPrivateKey(blob []byte, prompt passprompt.PasswordGetter) (crypto.PrivateKey, error) {
var reader io.Reader = bytes.NewReader(blob)
if blob[0] == '-' {
block, err := armor.Decode(reader)
if err != nil {
return nil, err
}
reader = block.Body
}
entity, err := openpgp.ReadEntity(packet.NewReader(reader))
if err != nil {
return nil, err
}
if entity.PrivateKey == nil {
return nil, errors.New("file does not contain a private key")
}
if entity.PrivateKey.Encrypted {
fmt.Fprintln(os.Stderr, "Key fingerprint:", entity.PrimaryKey.KeyIdString())
for name := range entity.Identities {
fmt.Fprintln(os.Stderr, "UID:", name)
}
fmt.Fprintln(os.Stderr)
for {
password, err := prompt.GetPasswd("Passphrase for key: ")
if err != nil {
return nil, err
} else if password == "" {
return nil, errors.New("Aborted")
}
err = entity.PrivateKey.Decrypt([]byte(password))
if err == nil {
break
}
}
}
return entity.PrivateKey.PrivateKey, nil
}
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