/// <summary>
/// Routes data written to the object into the <see cref="MD4"/> hash algorithm for computing the hash.
/// </summary>
/// <param name="array">The array of data bytes.</param>
/// <param name="ibStart">The offset into the byte array from which to begin using data.</param>
/// <param name="cbSize">The number of bytes in the array to use as data.</param>
/// <exception cref="ObjectDisposedException">The MD4CryptoServiceProvider instance has been disposed.</exception>
/// <exception cref="CryptographicException">The data could not be hashed.</exception>
protected override void HashCore(byte[] array, int ibStart, int cbSize)
{
if (m_Disposed)
{
throw new ObjectDisposedException(this.GetType().FullName);
}
byte[] copy = new byte[cbSize];
Array.Copy(array, ibStart, copy, 0, cbSize);
if (SspiProvider.CryptHashData(m_Hash, copy, copy.Length, 0) == 0)
{
throw new CryptographicException("The data could not be hashed.");
}
}
protected override void HashCore(byte[] array, int ibStart, int cbSize)
{
if (ibStart > 0)
{
GCHandle handle = GCHandle.Alloc(array, GCHandleType.Pinned);
try {
IntPtr address = handle.AddrOfPinnedObject();
if (SspiProvider.CryptHashData(m_Hash, new IntPtr(address.ToInt64() + ibStart), cbSize, 0) == 0)
{
throw new CryptographicException("The data could not be hashed.");
}
} finally {
handle.Free();
}
}
else
{
if (SspiProvider.CryptHashData(m_Hash, array, cbSize, 0) == 0)
{
throw new CryptographicException("The data could not be hashed.");
}
}
}