/// <summary>
/// Serialize a KeyParams class
/// </summary>
///
/// <param name="KeyObj">A KeyParams class</param>
///
/// <returns>A stream containing the KeyParams data</returns>
public static Stream Serialize(KeyParams KeyObj)
{
MemoryStream stream = new MemoryStream();
BinaryWriter writer = new BinaryWriter(stream);
writer.Write(KeyObj.Key != null ? (short)KeyObj.Key.Length : (short)0);
writer.Write(KeyObj.IV != null ? (short)KeyObj.IV.Length : (short)0);
writer.Write(KeyObj.IKM != null ? (short)KeyObj.IKM.Length : (short)0);
writer.Write(KeyObj.ExtKey != null ? (short)KeyObj.ExtKey.Length : (short)0);
if (KeyObj.Key != null)
{
writer.Write(KeyObj.Key);
}
if (KeyObj.IV != null)
{
writer.Write(KeyObj.IV);
}
if (KeyObj.IKM != null)
{
writer.Write(KeyObj.IKM);
}
if (KeyObj.ExtKey != null)
{
writer.Write(KeyObj.ExtKey);
}
stream.Seek(0, SeekOrigin.Begin);
return(stream);
}
/// <summary>
/// Compare this KeyParams instance with another
/// </summary>
///
/// <param name="Obj">KeyParams to compare</param>
///
/// <returns>Returns true if equal</returns>
public bool Equals(KeyParams Obj)
{
if (!Compare.IsEqual(Obj.Key, m_Key))
{
return(false);
}
if (!Compare.IsEqual(Obj.IV, m_Iv))
{
return(false);
}
if (!Compare.IsEqual(Obj.IKM, m_Ikm))
{
return(false);
}
if (!Compare.IsEqual(Obj.ExtKey, m_extKey))
{
return(false);
}
return(true);
}
/// <summary>
/// Initialize the Cipher
/// </summary>
///
/// <param name="KeyParam">Cipher key container.
/// <para>Uses the Key and IV fields of KeyParam.
/// The <see cref="LegalKeySizes"/> property contains valid Key sizes.
/// IV must be 8 bytes in size.</para>
/// </param>
///
/// <exception cref="System.ArgumentNullException">Thrown if a null key or iv is used</exception>
/// <exception cref="System.ArgumentOutOfRangeException">Thrown if an invalid key or iv size is used</exception>
public void Initialize(KeyParams KeyParam)
{
// recheck params
Scope();
if (KeyParam.IV == null || KeyParam.IV.Length != 8)
{
throw new Exception("ChaCha20:Initialize" + "Init parameters must include an IV!", new ArgumentException());
}
if (KeyParam.Key == null || KeyParam.Key.Length != 16 && KeyParam.Key.Length != 32)
{
throw new Exception("ChaCha20:Initialize" + "Key must be 16 or 32 bytes!", new ArgumentException());
}
if (IsParallel && ParallelBlockSize < ParallelMinimumSize || ParallelBlockSize > ParallelMaximumSize)
{
throw new Exception("ChaCha20:Initialize" + "The parallel block size is out of bounds!");
}
if (IsParallel && ParallelBlockSize % ParallelMinimumSize != 0)
{
throw new Exception("ChaCha20:Initialize" + "The parallel block size must be evenly aligned to the ParallelMinimumSize!");
}
if (DistributionCode == null)
{
if (KeyParam.Key.Length == 16)
{
m_dstCode = (byte[])TAU.Clone();
}
else
{
m_dstCode = (byte[])SIGMA.Clone();
}
}
Reset();
SetKey(KeyParam.Key, KeyParam.IV);
m_isInitialized = true;
}