/// <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="VTDev.Libraries.CEXEngine.Crypto.Common.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="VTDev.Libraries.CEXEngine.Crypto.Processing.Structure.VolumeKey">VolumeKey</see> containing the cipher and key implementation details</param>
/// <param name="SeedEngine">The <see cref="VTDev.Libraries.CEXEngine.Crypto.Enumeration.SeedGenerators">Random Generator</see> used to create the stage I seed material during key generation.</param>
/// <param name="HashEngine">The <see cref="VTDev.Libraries.CEXEngine.Crypto.Enumeration.Digests">Digest Engine</see> used in the stage II phase of key generation.</param>
///
/// <returns>A populated VolumeKey</returns>
public MemoryStream Create(VolumeKey Key, SeedGenerators SeedEngine = SeedGenerators.CSPRsg, Digests HashEngine = Digests.SHA512)
{
int ksize = Key.Count * (Key.Description.KeySize + Key.Description.IvSize);
byte[] kdata;
using (KeyGenerator keyGen = new KeyGenerator(SeedEngine, HashEngine, null))
kdata = keyGen.GetBytes(ksize);
MemoryStream keyStream = new MemoryStream();
byte[] hdr = Key.ToBytes();
keyStream.Write(hdr, 0, hdr.Length);
keyStream.Write(kdata, 0, kdata.Length);
keyStream.Seek(0, SeekOrigin.Begin);
return(keyStream);
}
private void UpdateKey()
{
byte[] ks = m_volumeKey.ToBytes();
m_keyStream.Seek(0, SeekOrigin.Begin);
m_keyStream.Write(ks, 0, ks.Length);
}