private void FromDescriptionTest()
{
MacDescription mds = new MacDescription(64, Digests.SHA256);
MacDescription mds2 = new MacDescription(mds.ToBytes());
MacDescription mds3 = new MacDescription(mds2.ToStream());
if (!mds.Equals(mds2) || !mds.Equals(mds3))
{
throw new Exception("MacStreamTest: Description serialization has failed!");
}
mds = new MacDescription(32, BlockCiphers.Rijndael, IVSizes.V128, BlockSizes.B128, RoundCounts.R14);
mds2 = new MacDescription(mds.ToBytes());
mds3 = new MacDescription(mds2.ToStream());
if (!mds.Equals(mds2) || !mds.Equals(mds3))
{
throw new Exception("MacStreamTest: Description serialization has failed!");
}
mds = new MacDescription(32, Digests.Blake2S256);
mds2 = new MacDescription(mds.ToBytes());
mds3 = new MacDescription(mds2.ToStream());
if (!mds.Equals(mds2) || !mds.Equals(mds3))
{
throw new Exception("MacStreamTest: Description serialization has failed!");
}
}
/// <summary>
/// Initialize the MacKey structure using a Stream
/// </summary>
///
/// <param name="KeyStream">The Stream containing the MacKey</param>
public MacKey(Stream KeyStream)
{
BinaryReader reader = new BinaryReader(KeyStream);
Description = new MacDescription(reader.ReadBytes(MacDescription.GetHeaderSize()));
KeyId = reader.ReadBytes(KEYUID_SIZE);
}
/// <summary>
/// Initialize the class with a MacDescription structure and a Key
/// </summary>
///
/// <param name="Description">A MacDescription structure containing details about the Mac generator</param>
/// <param name="MacKey">A KeyParams containing the Mac key and Iv; note the Ikm parameter in KeyParams is not used</param>
/// <param name="DisposeEngine">Dispose of digest engine when <see cref="Dispose()"/> on this class is called; default is false</param>
///
/// <exception cref="CryptoProcessingException">Thrown if the Mac key or parameters are invalid</exception>
public MacStream(MacDescription Description, KeyParams MacKey, bool DisposeEngine = false)
{
try
{
_macEngine = MacFromDescription.GetInstance(Description);
_macEngine.Initialize(MacKey.Key, MacKey.IV);
}
catch (Exception ex)
{
throw new CryptoProcessingException("MacStream:CTor", "The Mac parameters or key is invalid!", ex);
}
m_blockSize = _macEngine.BlockSize;
m_disposeEngine = DisposeEngine;
}
/// <summary>
/// MacKey structure constructor.
/// <para>KeyID and ExtRandom values must each be 16 bytes in length.
/// If they are not specified they will be populated automatically.</para>
/// </summary>
///
/// <param name="Description">The <see cref="VTDev.Libraries.CEXEngine.Crypto.Common.MacDescription">MacDescription</see> structure containing a complete description of the cipher instance</param>
/// <param name="KeyId">The unique 16 byte ID field used to identify this key. A null value auto generates this field</param>
///
/// <exception cref="CryptoProcessingException">Thrown if either the KeyId or ExtensionKey fields are null or invalid</exception>
public MacKey(MacDescription Description, byte[] KeyId = null)
{
this.Description = Description;
if (KeyId == null)
{
this.KeyId = Guid.NewGuid().ToByteArray();
}
else if (KeyId.Length != KEYUID_SIZE)
{
throw new CryptoProcessingException("MacKey:CTor", "The KeyId must be exactly 16 bytes!", new ArgumentOutOfRangeException());
}
else
{
this.KeyId = KeyId;
}
}
/// <summary>
/// Get an uninitialized Mac generator from its description structure
/// </summary>
///
/// <param name="Description">The structure describing the Mac generator</param>
///
/// <returns>An initialized Mac generator</returns>
///
/// <exception cref="CryptoProcessingException">Thrown if the Mac type is not supported</exception>
public static IMac GetInstance(MacDescription Description)
{
switch ((Macs)Description.MacType)
{
case Macs.CMAC:
{
return(new CMAC((BlockCiphers)Description.EngineType));
}
case Macs.HMAC:
{
return(new HMAC((Digests)Description.HmacEngine));
}
default:
throw new CryptoProcessingException("MacFromDescription:GetInstance", "The Mac generator is not recognized!");
}
}
private void HmacDescriptionTest()
{
CSPPrng rng = new CSPPrng();
byte[] data = rng.GetBytes(rng.Next(100, 400));
byte[] key = rng.GetBytes(64);
HMAC mac = new HMAC(Digests.SHA256);
mac.Initialize(key);
byte[] c1 = mac.ComputeMac(data);
MacDescription mds = new MacDescription(64, Digests.SHA256);
MacStream mst = new MacStream(mds, new KeyParams(key));
mst.Initialize(new MemoryStream(data));
byte[] c2 = mst.ComputeMac();
if (!Evaluate.AreEqual(c1, c2))
{
throw new Exception("MacStreamTest: HMAC code arrays are not equal!");
}
}
private void CmacDescriptionTest()
{
CSPPrng rng = new CSPPrng();
byte[] data = rng.GetBytes(rng.Next(100, 400));
byte[] key = rng.GetBytes(32);
byte[] iv = rng.GetBytes(16);
CMAC mac = new CMAC(BlockCiphers.Rijndael);
mac.Initialize(key, iv);
byte[] c1 = mac.ComputeMac(data);
MacDescription mds = new MacDescription(32, BlockCiphers.Rijndael, IVSizes.V128, BlockSizes.B128, RoundCounts.R14);
MacStream mst = new MacStream(mds, new KeyParams(key, iv));
mst.Initialize(new MemoryStream(data));
byte[] c2 = mst.ComputeMac();
if (!Evaluate.AreEqual(c1, c2))
{
throw new Exception("MacStreamTest: CMAC code arrays are not equal!");
}
}
/// <summary>
/// Set the MacDescription structure
/// </summary>
///
/// <param name="KeyStream">The stream containing a key package</param>
/// <param name="Description">The MacDescription structure</param>
public static void SetCipherDescription(Stream KeyStream, MacDescription Description)
{
KeyStream.Seek(MACDSC_SEEK, SeekOrigin.Begin);
new BinaryWriter(KeyStream).Write(Description.ToBytes());
}