/
opts.go
69 lines (61 loc) · 1.92 KB
/
opts.go
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// Copyright © 2018 SENETAS SECURITY PTY LTD
//
// 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 crypto
import (
"fmt"
"syscall"
"github.com/pkg/errors"
"golang.org/x/crypto/ssh/terminal"
)
// StdinPassReader reads a password from stdin
var StdinPassReader = func() ([]byte, error) { return terminal.ReadPassword(syscall.Stdin) }
// Opts stores data necessary for encryption
type Opts struct {
// whether the encryption data should be stored in a v2.2 compatible manifest or not
Compat bool
passphraseSet bool
passphrase string
Version int
Algos Algos
Iter int
}
// SetPassphrase sets the passphrase
func (o *Opts) SetPassphrase(passphrase string) {
o.passphrase = passphrase
o.passphraseSet = true
}
// GetPassphrase prompt the user to enter a passphrase to decrypt
func (o *Opts) GetPassphrase(passReader func() ([]byte, error)) (_ string, err error) {
if !o.passphraseSet {
o.passphrase, err = GetPassSTDIN("Enter passphrase: ", passReader)
if err != nil {
return
}
o.passphraseSet = true
}
return o.passphrase, nil
}
// GetPassSTDIN prompte the user for a passphrase
func GetPassSTDIN(prompt string, passReader func() ([]byte, error)) (_ string, err error) {
fmt.Print(prompt)
passphrase := []byte{}
for len(passphrase) == 0 {
passphrase, err = passReader()
if err != nil {
return "", errors.WithStack(err)
}
fmt.Println()
}
return string(passphrase), err
}