/// <summary>
/// Initialize the class and working variables.
/// <para>When this constructor is used, <see cref="Initialize(KeyParams)"/> is called automatically.</para>
/// </summary>
///
/// <param name="Key">HMAC Key; passed to HMAC Initialize() through constructor</param>
/// <param name="DisposeEngine">Dispose of digest engine when <see cref="Dispose()"/> on this class is called</param>
///
/// <exception cref="CryptoMacException">Thrown if a null Key is used</exception>
public SHA256HMAC(byte[] Key, bool DisposeEngine = true)
{
if (Key == null)
throw new CryptoMacException("SHA256HMAC:Ctor", "Key can not be null!", new ArgumentNullException());
_shaDigest = new SHA256();
_shaHmac = new HMAC(_shaDigest, Key, DisposeEngine);
_isInitialized = true;
}
/// <summary>
/// Initialize the class
/// <para>When using this constructor, you must call <see cref="Initialize(KeyParams)"/> before processing.</para>
/// </summary>
///
/// <param name="DisposeEngine">Dispose of digest engine when <see cref="Dispose()"/> on this class is called</param>
public SHA256HMAC(bool DisposeEngine = true)
{
_shaDigest = new SHA256();
_shaHmac = new HMAC(_shaDigest, DisposeEngine);
}
