/// <summary>
/// Create a volume key file using automatic key material generation.
/// <para>The Key, and IV sets are generated automatically using the cipher description contained in the <see cref="CipherDescription"/>.
/// This overload creates keying material using the seed and digest engines specified with the <see cref="KeyGenerator"/> class</para>
/// </summary>
///
/// <param name="Key">The <see cref="VolumeKey">VolumeKey</see> containing the cipher and key implementation details</param>
/// <param name="SeedEngine">The <see cref="Prngs">Random Generator</see> used to create the stage I seed material during key generation.</param>
/// <param name="HashEngine">The <see cref="Digests">Digest Engine</see> used in the stage II phase of key generation.</param>
///
/// <exception cref="System.IO.FileLoadException">A key file exists at the path specified</exception>
/// <exception cref="System.UnauthorizedAccessException">The key file path is read only</exception>
public void Create(VolumeKey Key, Prngs SeedEngine = Prngs.CSPRng, Digests HashEngine = Digests.SHA512)
{
int ksize = Key.Count * (Key.Description.KeySize + Key.Description.IvSize);
byte[] kdata;
using (KeyGenerator keyGen = new KeyGenerator(SeedEngine, HashEngine))
kdata = keyGen.GetBytes(ksize);
if (_keyStream == null)
_keyStream = new FileStream(_keyPath, FileMode.Create, FileAccess.Write);
byte[] hdr = Key.ToBytes();
_keyStream.Write(hdr, 0, hdr.Length);
_keyStream.Write(kdata, 0, kdata.Length);
}
