encode method

@override Bip39Mnemonic encode(List<int> entropyBytes)

Encode the provided entropy bytes into a BIP39 mnemonic phrase.

Parameters:

• entropyBytes: The entropy bytes to encode into a mnemonic phrase.

Implementation

@override
Bip39Mnemonic encode(List<int> entropyBytes) {
  entropyBytes = entropyBytes.asImmutableBytes;
  final entropyByteLen = entropyBytes.length;
  if (!Bip39EntropyGenerator.isValidEntropyByteLen(entropyByteLen)) {
    throw ArgumentException.invalidOperationArguments(
      "encode",
      name: "entropyBytes",
      reason: "Invalid entropy length.",
    );
  }

  final entropyBinStr = BytesUtils.toBinary(
    entropyBytes,
    zeroPadBitLen: entropyByteLen * 8,
  );
  final entropyHash = QuickCrypto.sha256Hash(entropyBytes);
  final entropyHashBinStr = BytesUtils.toBinary(
    entropyHash,
    zeroPadBitLen: QuickCrypto.sha256DigestSize * 8,
  );
  final mnemonicBinStr =
      entropyBinStr + entropyHashBinStr.substring(0, entropyByteLen ~/ 4);
  final mnemonic = <String>[];
  for (
    var i = 0;
    i < mnemonicBinStr.length;
    i += Bip39MnemonicConst.wordBitLen
  ) {
    final wordBinStr = mnemonicBinStr.substring(
      i,
      i + Bip39MnemonicConst.wordBitLen,
    );

    final wordIdx = int.parse(wordBinStr, radix: 2);
    mnemonic.add(wordsList.getWordAtIdx(wordIdx));
  }

  return Bip39Mnemonic.fromList(mnemonic);
}