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package mkcw
import (
"crypto/rand"
"encoding/hex"
"fmt"
"os"
"github.com/containers/luksy"
)
// CheckLUKSPassphrase checks that the specified LUKS-encrypted file can be
// decrypted using the specified passphrase.
func CheckLUKSPassphrase(path, decryptionPassphrase string) error {
f, err := os.Open(path)
if err != nil {
return err
}
defer f.Close()
v1header, v2headerA, v2headerB, v2json, err := luksy.ReadHeaders(f, luksy.ReadHeaderOptions{})
if err != nil {
return err
}
if v1header != nil {
_, _, _, _, err = v1header.Decrypt(decryptionPassphrase, f)
return err
}
if v2headerA == nil && v2headerB == nil {
return fmt.Errorf("no LUKS headers read from %q", path)
}
if v2headerA != nil {
if _, _, _, _, err = v2headerA.Decrypt(decryptionPassphrase, f, *v2json); err != nil {
return err
}
}
if v2headerB != nil {
if _, _, _, _, err = v2headerB.Decrypt(decryptionPassphrase, f, *v2json); err != nil {
return err
}
}
return nil
}
// GenerateDiskEncryptionPassphrase generates a random disk encryption password
func GenerateDiskEncryptionPassphrase() (string, error) {
randomizedBytes := make([]byte, 32)
if _, err := rand.Read(randomizedBytes); err != nil {
return "", err
}
return hex.EncodeToString(randomizedBytes), nil
}
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