checkDecode static method

List<int> checkDecode(
  1. String data, [
  2. Base58Alphabets base58alphabets = Base58Alphabets.bitcoin
])

Decode and verify the provided Base58 encoded data into a List of data bytes using a specified Base58 alphabet.

This method verifies the checksum of the decoded data to ensure its integrity.

Parameters:

  • data: The Base58 encoded string to be decoded and verified.
  • base58alphabets: Optional Base58Alphabets enum to choose the alphabet (default is Base58Alphabets.bitcoin).

Returns: A List containing the decoded data bytes if the checksum is valid.

Throws:

  • Base58ChecksumError: If the checksum verification fails.

Implementation

static List<int> checkDecode(
  String data, [
  Base58Alphabets base58alphabets = Base58Alphabets.bitcoin,
]) {
  final decodedBytes = decode(data, base58alphabets);
  final dataBytes = decodedBytes.sublist(
    0,
    decodedBytes.length - Base58Const.checksumByteLen,
  );
  final checksumBytes = decodedBytes.sublist(
    decodedBytes.length - Base58Const.checksumByteLen,
  );

  final computedChecksum = Base58Utils.computeChecksum(dataBytes);
  if (!BytesUtils.bytesEqual(checksumBytes, computedChecksum)) {
    throw Base58ChecksumError();
  }

  return dataBytes;
}