/// <summary>
/// Constructs a DtmForwardKeyStruct from a stream
/// </summary>
///
/// <param name="SessionStream">Stream containing a serialized DtmForwardKeyStruct</param>
///
/// <returns>A populated DtmForwardKeyStruct</returns>
public DtmForwardKeyStruct(Stream SessionStream)
{
BinaryReader reader = new BinaryReader(SessionStream);
Key = KeyParams.DeSerialize(SessionStream);
SessionParams = new DtmSessionStruct(SessionStream);
LifeSpan = reader.ReadInt64();
Instruction = reader.ReadInt16();
OptionsFlag = reader.ReadInt64();
}
/// <summary>
/// Extract a KeyParams and CipherKey
/// </summary>
///
/// <param name="KeyHeader">The <see cref="VTDev.Libraries.CEXEngine.Crypto.Processing.Structure.CipherKey"/> that receives the cipher description, key id, and extension key</param>
/// <param name="KeyParam">The <see cref="VTDev.Libraries.CEXEngine.Crypto.Common.KeyParams"/> container that receives the key material from the file</param>
///
/// <exception cref="CryptoProcessingException">Thrown if the key file could not be found or a Header parameter does not match the keystream length</exception>
public void Extract(out CipherKey KeyHeader, out KeyParams KeyParam)
{
m_keyStream.Seek(0, SeekOrigin.Begin);
KeyHeader = new CipherKey(m_keyStream);
CipherDescription dsc = KeyHeader.Description;
if (m_keyStream.Length < dsc.KeySize + dsc.IvSize + dsc.MacKeySize + CipherKey.GetHeaderSize())
{
throw new CryptoProcessingException("KeyFactory:Extract", "The size of the key file does not align with the CipherKey sizes! Key is corrupt.", new ArgumentOutOfRangeException());
}
m_keyStream.Seek(CipherKey.GetHeaderSize(), SeekOrigin.Begin);
KeyParam = KeyParams.DeSerialize(m_keyStream);
}
private void KeyParamsTest()
{
CSPPrng rnd = new CSPPrng();
KeyGenerator kg = new KeyGenerator();
for (int i = 0; i < 10; ++i)
{
// out-bound funcs return pointer to obj
KeyParams kp1 = kg.GetKeyParams(rnd.Next(1, 1024), rnd.Next(1, 128), rnd.Next(1, 128));
MemoryStream m = (MemoryStream)KeyParams.Serialize(kp1);
KeyParams kp2 = KeyParams.DeSerialize(m);
if (!kp1.Equals(kp2))
{
throw new Exception("KeyFactoryTest: KeyParams serialization test has failed!");
}
if (kp1.GetHashCode() != kp2.GetHashCode())
{
throw new Exception("KeyFactoryTest: KeyAuthority hash code test has failed!");
}
}
}
