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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| package eu.faircode.email; | ||
|
|
||
| /* | ||
| This file is part of FairEmail. | ||
| FairEmail is free software: you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation, either version 3 of the License, or | ||
| (at your option) any later version. | ||
| FairEmail is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| GNU General Public License for more details. | ||
| You should have received a copy of the GNU General Public License | ||
| along with FairEmail. If not, see <http://www.gnu.org/licenses/>. | ||
| Copyright 2018-2022 by Marcel Bokhorst (M66B) | ||
| */ | ||
|
|
||
| import java.security.SecureRandom; | ||
|
|
||
| import io.github.novacrypto.bip39.MnemonicGenerator; | ||
| import io.github.novacrypto.bip39.Words; | ||
| import io.github.novacrypto.bip39.wordlists.English; | ||
|
|
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| public class MnemonicHelper { | ||
| // https://github.com/NovaCrypto/BIP39 | ||
|
|
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| static String get(byte[] entropy) { | ||
| StringBuilder sb = new StringBuilder(); | ||
| new SecureRandom().nextBytes(entropy); | ||
| new MnemonicGenerator(English.INSTANCE).createMnemonic(entropy, sb::append); | ||
| return sb.toString(); | ||
| } | ||
|
|
||
| static String get(String hex) { | ||
| return get(fromHex(hex)); | ||
| } | ||
|
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| static byte[] generate() { | ||
| byte[] entropy = new byte[Words.TWELVE.byteLength()]; | ||
| new SecureRandom().nextBytes(entropy); | ||
| return entropy; | ||
| } | ||
|
|
||
| private static byte[] fromHex(String hex) { | ||
| int len = hex.length(); | ||
| byte[] data = new byte[len / 2]; | ||
| for (int i = 0; i < len; i += 2) { | ||
| data[i / 2] = | ||
| (byte) ((Character.digit(hex.charAt(i), 16) << 4) + | ||
| Character.digit(hex.charAt(i + 1), 16)); | ||
| } | ||
| return data; | ||
| } | ||
| } |
42 changes: 42 additions & 0 deletions
42
app/src/main/java/io/github/novacrypto/bip39/AlphabeticalCharSequenceComparator.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| /* | ||
| * BIP39 library, a Java implementation of BIP39 | ||
| * Copyright (C) 2017-2019 Alan Evans, NovaCrypto | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| * | ||
| * Original source: https://github.com/NovaCrypto/BIP39 | ||
| * You can contact the authors via github issues. | ||
| */ | ||
|
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| package io.github.novacrypto.bip39; | ||
|
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| import java.util.Comparator; | ||
|
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| enum CharSequenceComparators implements Comparator<CharSequence> { | ||
|
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| ALPHABETICAL { | ||
| @Override | ||
| public int compare(final CharSequence o1, final CharSequence o2) { | ||
| final int length1 = o1.length(); | ||
| final int length2 = o2.length(); | ||
| final int length = Math.min(length1, length2); | ||
| for (int i = 0; i < length; i++) { | ||
| final int compare = Character.compare(o1.charAt(i), o2.charAt(i)); | ||
| if (compare != 0) return compare; | ||
| } | ||
| return Integer.compare(length1, length2); | ||
| } | ||
| } | ||
|
|
||
| } |
58 changes: 58 additions & 0 deletions
58
app/src/main/java/io/github/novacrypto/bip39/ByteUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| /* | ||
| * BIP39 library, a Java implementation of BIP39 | ||
| * Copyright (C) 2017-2019 Alan Evans, NovaCrypto | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| * | ||
| * Original source: https://github.com/NovaCrypto/BIP39 | ||
| * You can contact the authors via github issues. | ||
| */ | ||
|
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| package io.github.novacrypto.bip39; | ||
|
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| final class ByteUtils { | ||
|
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| static int next11Bits(byte[] bytes, int offset) { | ||
| final int skip = offset / 8; | ||
| final int lowerBitsToRemove = (3 * 8 - 11) - (offset % 8); | ||
| return (((int) bytes[skip] & 0xff) << 16 | | ||
| ((int) bytes[skip + 1] & 0xff) << 8 | | ||
| (lowerBitsToRemove < 8 | ||
| ? ((int) bytes[skip + 2] & 0xff) | ||
| : 0)) >> lowerBitsToRemove & (1 << 11) - 1; | ||
| } | ||
|
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| static void writeNext11(byte[] bytes, int value, int offset) { | ||
| int skip = offset / 8; | ||
| int bitSkip = offset % 8; | ||
| {//byte 0 | ||
| byte firstValue = bytes[skip]; | ||
| byte toWrite = (byte) (value >> (3 + bitSkip)); | ||
| bytes[skip] = (byte) (firstValue | toWrite); | ||
| } | ||
|
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| {//byte 1 | ||
| byte valueInByte = bytes[skip + 1]; | ||
| final int i = 5 - bitSkip; | ||
| byte toWrite = (byte) (i > 0 ? (value << i) : (value >> -i)); | ||
| bytes[skip + 1] = (byte) (valueInByte | toWrite); | ||
| } | ||
|
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| if (bitSkip >= 6) {//byte 2 | ||
| byte valueInByte = bytes[skip + 2]; | ||
| byte toWrite = (byte) (value << 13 - bitSkip); | ||
| bytes[skip + 2] = (byte) (valueInByte | toWrite); | ||
| } | ||
| } | ||
| } |
51 changes: 51 additions & 0 deletions
51
app/src/main/java/io/github/novacrypto/bip39/CharSequenceSplitter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| /* | ||
| * BIP39 library, a Java implementation of BIP39 | ||
| * Copyright (C) 2017-2019 Alan Evans, NovaCrypto | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| * | ||
| * Original source: https://github.com/NovaCrypto/BIP39 | ||
| * You can contact the authors via github issues. | ||
| */ | ||
|
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| package io.github.novacrypto.bip39; | ||
|
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| import java.util.LinkedList; | ||
| import java.util.List; | ||
|
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| final class CharSequenceSplitter { | ||
|
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| private final char separator1; | ||
| private final char separator2; | ||
|
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| CharSequenceSplitter(final char separator1, final char separator2) { | ||
| this.separator1 = separator1; | ||
| this.separator2 = separator2; | ||
| } | ||
|
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| List<CharSequence> split(final CharSequence charSequence) { | ||
| final LinkedList<CharSequence> list = new LinkedList<>(); | ||
| int start = 0; | ||
| final int length = charSequence.length(); | ||
| for (int i = 0; i < length; i++) { | ||
| final char c = charSequence.charAt(i); | ||
| if (c == separator1 || c == separator2) { | ||
| list.add(charSequence.subSequence(start, i)); | ||
| start = i + 1; | ||
| } | ||
| } | ||
| list.add(charSequence.subSequence(start, length)); | ||
| return list; | ||
| } | ||
| } |
66 changes: 66 additions & 0 deletions
66
app/src/main/java/io/github/novacrypto/bip39/JavaxPBKDF2WithHmacSHA512.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| /* | ||
| * BIP39 library, a Java implementation of BIP39 | ||
| * Copyright (C) 2017-2019 Alan Evans, NovaCrypto | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| * | ||
| * Original source: https://github.com/NovaCrypto/BIP39 | ||
| * You can contact the authors via github issues. | ||
| */ | ||
|
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| package io.github.novacrypto.bip39; | ||
|
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| import io.github.novacrypto.toruntime.CheckedExceptionToRuntime; | ||
|
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| import javax.crypto.SecretKey; | ||
| import javax.crypto.SecretKeyFactory; | ||
| import javax.crypto.spec.PBEKeySpec; | ||
|
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| import static io.github.novacrypto.toruntime.CheckedExceptionToRuntime.toRuntime; | ||
|
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| /** | ||
| * Not available in all Java implementations, for example will not find the implementation before Android API 26+. | ||
| * See https://developer.android.com/reference/javax/crypto/SecretKeyFactory.html for more details. | ||
| */ | ||
| public enum JavaxPBKDF2WithHmacSHA512 implements PBKDF2WithHmacSHA512 { | ||
| INSTANCE; | ||
|
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| private SecretKeyFactory skf = getPbkdf2WithHmacSHA512(); | ||
|
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| @Override | ||
| public byte[] hash(char[] chars, byte[] salt) { | ||
| final PBEKeySpec spec = new PBEKeySpec(chars, salt, 2048, 512); | ||
| final byte[] encoded = generateSecretKey(spec).getEncoded(); | ||
| spec.clearPassword(); | ||
| return encoded; | ||
| } | ||
|
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| private SecretKey generateSecretKey(final PBEKeySpec spec) { | ||
| return toRuntime(new CheckedExceptionToRuntime.Func<SecretKey>() { | ||
| @Override | ||
| public SecretKey run() throws Exception { | ||
| return skf.generateSecret(spec); | ||
| } | ||
| }); | ||
| } | ||
|
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| private static SecretKeyFactory getPbkdf2WithHmacSHA512() { | ||
| return toRuntime(new CheckedExceptionToRuntime.Func<SecretKeyFactory>() { | ||
| @Override | ||
| public SecretKeyFactory run() throws Exception { | ||
| return SecretKeyFactory.getInstance("PBKDF2WithHmacSHA512"); | ||
| } | ||
| }); | ||
| } | ||
| } |
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