public MnemonicKeyPair DerivedKey(bool hardened, string path = null)
{
DeterministicKeyPair master = DeterministicKeyPair;
// check if we really have the masterKey at hand
//mpiva limitation no go back in history
if (master.Depth != 0)
{
throw new AException("Given mnemonicKeyPair object does not contain the master key");
}
/**
* following the BIP32 specification create the following tree purpose -> coin -> account ->
* external chain -> child address
*/
/**
* always set path for purpose {@link BaseConstants.HD_CHAIN_PURPOSE}, coin {@link
* BaseConstants.HD_CHAIN_CODE_AETERNITY}
*/
string pathToDerivedKey = "m/" + Constants.BaseConstants.HD_CHAIN_PURPOSE + "'/" + Constants.BaseConstants.HD_CHAIN_CODE_AETERNITY + "'";
/** if no arguments are given, set default account and external chain (0h, 0h) */
if (string.IsNullOrEmpty(path))
{
pathToDerivedKey += "/0'/0'";
/** in case arguments are given - add warning */
}
else
{
pathToDerivedKey += "/" + path;
pathToDerivedKey = pathToDerivedKey.Replace("//", "/");
}
DeterministicKeyPair nextChildDeterministicKeyPair = master.DeriveNextChild(pathToDerivedKey, hardened);
// derive a new child
RawKeyPair childRawKeyPair = new RawKeyPair(Hex.ToHexString(nextChildDeterministicKeyPair.PrivateKey.ToBytes()));
return(new MnemonicKeyPair(childRawKeyPair, MnemonicSeedWords, nextChildDeterministicKeyPair));
}
