/// <summary>
/// Initializes a new instance of <see cref="BIP0085"/>.
/// </summary>
/// <exception cref="ArgumentException"/>
/// <exception cref="ArgumentNullException"/>
/// <exception cref="ArgumentOutOfRangeException"/>
/// <exception cref="FormatException"/>
/// <param name="masterExtendedKey">Master extended key (xprv string)</param>
/// <param name="netType">
/// [Default value = <see cref="NetworkType.MainNet"/>]
/// The expected network that this extended key belongs to.
/// </param>
public BIP0085(string masterExtendedKey, NetworkType netType = NetworkType.MainNet)
{
bip32 = new BIP0032(masterExtendedKey, netType);
ReadOnlySpan <byte> empty = new byte[4];
if (!empty.SequenceEqual(bip32.ChildNumber) || !empty.SequenceEqual(bip32.ParentFingerPrint))
{
throw new ArgumentException("BIP-85 is only defined for master extended keys.", nameof(masterExtendedKey));
}
hmac = new HmacSha512();
}
