mirror of
https://github.com/wealdtech/ethdo.git
synced 2026-01-07 21:24:01 -05:00
104 lines
3.1 KiB
Go
104 lines
3.1 KiB
Go
// Copyright © 2020 - 2023 Weald Technology Trading
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package util
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import (
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"regexp"
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"strings"
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"github.com/pkg/errors"
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"github.com/tyler-smith/go-bip39"
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"github.com/tyler-smith/go-bip39/wordlists"
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"golang.org/x/text/unicode/norm"
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)
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// hdPathRegex is the regular expression that matches an HD path.
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var hdPathRegex = regexp.MustCompile("^m/[0-9]+/[0-9]+(/[0-9+])+")
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var mnemonicWordLists = [][]string{
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wordlists.English,
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wordlists.ChineseSimplified,
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wordlists.ChineseTraditional,
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wordlists.Czech,
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wordlists.French,
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wordlists.Italian,
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wordlists.Japanese,
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wordlists.Korean,
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wordlists.Spanish,
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}
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// SeedFromMnemonic creates a seed from a mnemonic.
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func SeedFromMnemonic(mnemonic string) ([]byte, error) {
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// Handle situations where there may be a passphrase with the mnemonic.
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mnemonicParts := strings.Split(mnemonic, " ")
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mnemonicPassphrase := ""
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switch {
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case len(mnemonicParts) == 13:
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// Assume that passphrase is a single word here.
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mnemonic = strings.Join(mnemonicParts[:12], " ")
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mnemonicPassphrase = mnemonicParts[12]
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case len(mnemonicParts) == 19:
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// Assume that passphrase is a single word here.
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mnemonic = strings.Join(mnemonicParts[:18], " ")
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mnemonicPassphrase = mnemonicParts[18]
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case len(mnemonicParts) > 24:
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mnemonic = strings.Join(mnemonicParts[:24], " ")
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mnemonicPassphrase = strings.Join(mnemonicParts[24:], " ")
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}
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// Normalise the input.
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mnemonic = string(norm.NFKD.Bytes([]byte(mnemonic)))
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mnemonicPassphrase = string(norm.NFKD.Bytes([]byte(mnemonicPassphrase)))
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// Try with the various word lists.
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for _, wl := range mnemonicWordLists {
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bip39.SetWordList(wl)
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seed, err := bip39.NewSeedWithErrorChecking(expandMnemonic(mnemonic), mnemonicPassphrase)
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if err == nil {
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return seed, nil
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}
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}
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return nil, errors.New("mnemonic is invalid")
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}
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// expandMnmenonic expands mnemonics from their 4-letter versions.
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func expandMnemonic(input string) string {
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wordList := bip39.GetWordList()
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truncatedWords := make(map[string]string, len(wordList))
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for _, word := range wordList {
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if len(word) > 4 {
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truncatedWords[firstFour(word)] = word
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}
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}
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mnemonicWords := strings.Split(input, " ")
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for i := range mnemonicWords {
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if fullWord, exists := truncatedWords[norm.NFKC.String(mnemonicWords[i])]; exists {
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mnemonicWords[i] = fullWord
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}
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}
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return strings.Join(mnemonicWords, " ")
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}
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// firstFour provides the first four letters for a potentially longer word.
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func firstFour(s string) string {
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// Use NFKC here for composition, to avoid accents counting as their own characters.
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s = norm.NFKC.String(s)
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r := []rune(s)
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if len(r) > 4 {
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return string(r[:4])
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}
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return s
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}
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