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113 lines
2.7 KiB
Go
113 lines
2.7 KiB
Go
package btc
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import (
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"bufio"
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"crypto/sha512"
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"encoding/hex"
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"errors"
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"fmt"
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"os"
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"strings"
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"syscall"
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"github.com/btcsuite/btcd/chaincfg"
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"github.com/btcsuite/btcutil/hdkeychain"
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"github.com/guggero/chantools/bip39"
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"golang.org/x/crypto/pbkdf2"
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"golang.org/x/crypto/ssh/terminal"
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)
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func ReadMnemonicFromTerminal(params *chaincfg.Params) (*hdkeychain.ExtendedKey,
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error) {
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// We'll now prompt the user to enter in their 12 to 24 word mnemonic.
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fmt.Printf("Input your 12 to 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, err
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}
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fmt.Println()
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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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mnemonicWords := strings.Split(mnemonicStr, " ")
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if len(mnemonicWords) < 12 || len(mnemonicWords) > 24 {
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return nil, errors.New("wrong cipher seed mnemonic length: " +
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"must be between 12 and 24 words")
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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, err
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}
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fmt.Println()
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// Check that the mnemonic is valid.
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_, err = bip39.EntropyFromMnemonic(mnemonicStr)
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if err != nil {
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return nil, err
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}
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var seed []byte
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fmt.Printf("Please choose passphrase mode:\n" +
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" 0 - Default BIP39\n" +
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" 1 - Passphrase to hex\n" +
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" 2 - Digital Bitbox (extra round of PBKDF2)\n" +
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"\n" +
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"Choice [default 0]: ")
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choice, err := reader.ReadString('\n')
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if err != nil {
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return nil, err
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}
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fmt.Println()
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switch strings.TrimSpace(choice) {
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case "", "0":
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seed = pbkdf2.Key(
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[]byte(mnemonicStr), append(
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[]byte("mnemonic"), passphrase...,
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), 2048, 64, sha512.New,
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)
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case "1":
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passphrase = []byte(hex.EncodeToString(passphrase))
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seed = pbkdf2.Key(
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[]byte(mnemonicStr), append(
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[]byte("mnemonic"), passphrase...,
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), 2048, 64, sha512.New,
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)
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case "2":
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passphrase = pbkdf2.Key(
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passphrase, []byte("Digital Bitbox"), 20480, 64,
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sha512.New,
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)
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passphrase = []byte(hex.EncodeToString(passphrase))
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seed = pbkdf2.Key(
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[]byte(mnemonicStr), append(
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[]byte("mnemonic"), passphrase...,
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), 2048, 64, sha512.New,
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)
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default:
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return nil, fmt.Errorf("invalid mode selected: %v",
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choice)
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}
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rootKey, err := hdkeychain.NewMaster(seed, params)
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if err != nil {
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return nil, fmt.Errorf("failed to derive master extended "+
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"key: %v", err)
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}
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return rootKey, nil
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}
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