82 lines
2.5 KiB
Kotlin
82 lines
2.5 KiB
Kotlin
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package cash.z.wallet.sdk.util
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import cash.z.android.plugin.MnemonicPlugin
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import io.github.novacrypto.bip39.MnemonicGenerator
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import io.github.novacrypto.bip39.SeedCalculator
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import io.github.novacrypto.bip39.Words
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import io.github.novacrypto.bip39.wordlists.English
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import java.security.SecureRandom
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class SimpleMnemonics : MnemonicPlugin {
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override fun nextEntropy(): ByteArray {
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return ByteArray(Words.TWENTY_FOUR.byteLength()).apply {
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SecureRandom().nextBytes(this)
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}
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}
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override fun nextMnemonic(): CharArray {
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return nextMnemonic(nextEntropy())
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}
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override fun nextMnemonic(entropy: ByteArray): CharArray {
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return StringBuilder().let { builder ->
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MnemonicGenerator(English.INSTANCE).createMnemonic(entropy) { c ->
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builder.append(c)
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}
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builder.toString().toCharArray()
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}
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}
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override fun nextMnemonicList(): List<CharArray> {
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return nextMnemonicList(nextEntropy())
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}
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override fun nextMnemonicList(entropy: ByteArray): List<CharArray> {
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return WordListBuilder().let { builder ->
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MnemonicGenerator(English.INSTANCE).createMnemonic(entropy) { c ->
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builder.append(c)
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}
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builder.wordList
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}
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}
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override fun toSeed(mnemonic: CharArray): ByteArray {
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return SeedCalculator().calculateSeed(String(mnemonic), "")
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}
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override fun toWordList(mnemonic: CharArray): List<CharArray> {
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val wordList = mutableListOf<CharArray>()
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var cursor = 0
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repeat(mnemonic.size) { i ->
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val isSpace = mnemonic[i] == ' '
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if (isSpace || i == (mnemonic.size - 1)) {
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val wordSize = i - cursor + if (isSpace) 0 else 1
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wordList.add(CharArray(wordSize).apply {
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repeat(wordSize) {
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this[it] = mnemonic[cursor + it]
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}
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})
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cursor = i + 1
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}
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}
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return wordList
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}
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class WordListBuilder {
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val wordList = mutableListOf<CharArray>()
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fun append(c: CharSequence) {
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if (c[0] != English.INSTANCE.space) addWord(c)
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}
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private fun addWord(c: CharSequence) {
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c.length.let { size ->
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val word = CharArray(size)
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repeat(size) {
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word[it] = c[it]
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}
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wordList.add(word)
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}
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}
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}
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}
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