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84 lines
2.5 KiB
Go
84 lines
2.5 KiB
Go
package lnd
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import (
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"bufio"
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"fmt"
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"os"
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"regexp"
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"strings"
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"syscall"
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"time"
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"github.com/btcsuite/btcd/chaincfg"
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"github.com/btcsuite/btcutil/hdkeychain"
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"github.com/lightningnetwork/lnd/aezeed"
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"golang.org/x/crypto/ssh/terminal"
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)
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var (
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numberDotsRegex = regexp.MustCompile("[\\d.\\-\\n\\r\\t]*")
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multipleSpaces = regexp.MustCompile(" [ ]+")
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)
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func ReadAezeedFromTerminal(params *chaincfg.Params) (*hdkeychain.ExtendedKey,
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time.Time, error) {
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// We'll now prompt the user to enter in their 24-word mnemonic.
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fmt.Printf("Input your 24-word mnemonic separated by spaces: ")
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reader := bufio.NewReader(os.Stdin)
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mnemonicStr, err := reader.ReadString('\n')
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if err != nil {
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return nil, time.Unix(0, 0), err
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}
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// We'll trim off extra spaces, and ensure the mnemonic is all
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// lower case.
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mnemonicStr = strings.TrimSpace(mnemonicStr)
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mnemonicStr = strings.ToLower(mnemonicStr)
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// To allow the tool to also accept the copy/pasted version of the
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// backup text (which contains numbers and dots and multiple spaces),
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// we do some more cleanup with regex.
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mnemonicStr = numberDotsRegex.ReplaceAllString(mnemonicStr, "")
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mnemonicStr = multipleSpaces.ReplaceAllString(mnemonicStr, " ")
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mnemonicStr = strings.TrimSpace(mnemonicStr)
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cipherSeedMnemonic := strings.Split(mnemonicStr, " ")
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fmt.Println()
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if len(cipherSeedMnemonic) != 24 {
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return nil, time.Unix(0, 0), fmt.Errorf("wrong cipher seed "+
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"mnemonic length: got %v words, expecting %v words",
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len(cipherSeedMnemonic), 24)
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}
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// Additionally, the user may have a passphrase, that will also
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// need to be provided so the daemon can properly decipher the
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// cipher seed.
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fmt.Printf("Input your cipher seed passphrase (press enter if " +
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"your seed doesn't have a passphrase): ")
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passphrase, err := terminal.ReadPassword(int(syscall.Stdin)) // nolint
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if err != nil {
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return nil, time.Unix(0, 0), err
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}
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fmt.Println()
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var mnemonic aezeed.Mnemonic
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copy(mnemonic[:], cipherSeedMnemonic)
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// If we're unable to map it back into the ciphertext, then either the
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// mnemonic is wrong, or the passphrase is wrong.
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cipherSeed, err := mnemonic.ToCipherSeed(passphrase)
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if err != nil {
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return nil, time.Unix(0, 0), fmt.Errorf("failed to decrypt "+
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"seed with passphrase: %v", err)
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}
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rootKey, err := hdkeychain.NewMaster(cipherSeed.Entropy[:], params)
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if err != nil {
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return nil, time.Unix(0, 0), fmt.Errorf("failed to derive " +
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"master extended key")
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}
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return rootKey, cipherSeed.BirthdayTime(), nil
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}
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