/// <summary>
/// Sets Bip32 private key.
/// Uses a single invocation of HMACSHA512 to generate 512 bits of entropy with which to set master private key and chaincode.
/// </summary>
/// <param name="hmacData">Sequence of bytes passed as hmacData to HMACSHA512 along with byte encoding of hmacKey.</param>
/// <param name="required">if not null, each key path will be verified as valid on the generated key or returns null.</param>
/// <param name="hmacKey">Default is current global Kz.MasterBip32Key which may default to "Bitcoin seed".</param>
/// <returns>Returns this key unless required key paths aren't valid for generated key.</returns>
public KzExtPrivKey SetMasterBip32(ReadOnlySpan <byte> hmacData, IEnumerable <KzKeyPath> required = null, string hmacKey = null)
{
hmacKey = hmacKey ?? Kz.MasterBip32Key;
var vout = KzHashes.HMACSHA512(hmacKey.UTF8NFKDToBytes(), hmacData);
return(SetMaster(vout, required));
}
public KzExtPrivKey SetMaster(ReadOnlySpan <byte> seed, IEnumerable <KzKeyPath> required = null)
{
var vout = KzHashes.HMACSHA512(Encoding.ASCII.GetBytes(Kz.SetMasterSeed), seed).ReadOnlySpan;
return(SetMaster(vout.Slice(0, 32).ToKzUInt256(), vout.Slice(32, 32).ToKzUInt256(), required));
}