wotsPkFromSig static method

Implementation

static Uint8List wotsPkFromSig(
  Uint8List signature,
  Uint8List msg,
  Uint8List pubSeed,
  Uint8List addr,
) {
  final pk = Uint8List(WOTSSIGBYTES);
  final lengths = List<int>.filled(WOTSLEN, 0);

  // Copy and wrap address
  final caddr = Uint8List.fromList(addr);
  final wotsAddr = WotsAddress.wotsAddressFromBytes(caddr);
  final bbaddr = ByteBuffer.wrap(wotsAddr.bytes().sublist(0, PARAMSN));
  bbaddr.order(ByteOrder.littleEndian);

  // Compute lengths
  chainLengths(msg, lengths);

  // Verify signature
  for (int i = 0; i < WOTSLEN; i++) {
    WOTSHash.setChainAddr(bbaddr, i);
    genChain(pk, i * PARAMSN, signature, i * PARAMSN, lengths[i],
        WOTSW - 1 - lengths[i], pubSeed, bbaddr.array());
  }

  return pk;
}