mirror of https://github.com/M66B/FairEmail.git
81 lines
2.8 KiB
Java
81 lines
2.8 KiB
Java
package eu.faircode.email;
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/*
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This file is part of FairEmail.
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FairEmail is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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FairEmail is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FairEmail. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2018-2024 by Marcel Bokhorst (M66B)
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*/
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import android.content.Context;
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import android.text.TextUtils;
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import androidx.annotation.NonNull;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.security.SecureRandom;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Locale;
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public class BIP39 {
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// https://github.com/bitcoin/bips/tree/master/bip-0039
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// https://github.com/bitcoin/bips/pull/1129
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static String getMnemonic(@NonNull Locale locale, int words, Context context) {
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List<String> list = new ArrayList<>();
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SecureRandom rnd = new SecureRandom();
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for (int i = 0; i < words; i++)
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list.add(BIP39.getWord(locale, rnd.nextInt(2048), context));
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String delimiter = ("ja".equals(locale.getLanguage()) ? "\u3000" : " ");
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return TextUtils.join(delimiter, list);
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}
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private static String getWord(@NonNull Locale locale, int index, Context context) {
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String lang = locale.getLanguage();
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if ("zh".equals(lang) && "CN".equals(locale.getCountry()))
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lang = "zh_cn";
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try (InputStream is = context.getAssets().open("bip39/" + lang + ".txt")) {
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return getWord(is, index);
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} catch (Throwable ex) {
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Log.w(ex);
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try (InputStream is = context.getAssets().open("bip39/en.txt")) {
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return getWord(is, index);
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} catch (Throwable exex) {
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Log.e(exex);
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return getRandomWord(5);
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}
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}
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}
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private static String getWord(InputStream is, int index) throws IOException {
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String word = null;
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BufferedReader br = new BufferedReader(new InputStreamReader(is));
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for (int i = 0; i <= index; i++)
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word = br.readLine();
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return word;
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}
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private static String getRandomWord(int len) {
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SecureRandom rnd = new SecureRandom();
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StringBuilder sb = new StringBuilder(len);
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for (int i = 0; i < len; i++)
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sb.append((char) ('a' + rnd.nextInt(26)));
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return sb.toString();
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}
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}
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