public HashingStreamEx(Stream sBaseStream, bool bWriting, HashAlgorithm hashAlgorithm)
{
if(sBaseStream == null) throw new ArgumentNullException("sBaseStream");
m_sBaseStream = sBaseStream;
m_bWriting = bWriting;
#if !KeePassLibSD
m_hash = (hashAlgorithm ?? new SHA256Managed());
#else // KeePassLibSD
m_hash = null;
try { m_hash = HashAlgorithm.Create("SHA256"); }
catch(Exception) { }
try { if(m_hash == null) m_hash = HashAlgorithm.Create(); }
catch(Exception) { }
#endif
if(m_hash == null) { Debug.Assert(false); return; }
// Validate hash algorithm
if((!m_hash.CanReuseTransform) || (!m_hash.CanTransformMultipleBlocks) ||
(m_hash.InputBlockSize != 1) || (m_hash.OutputBlockSize != 1))
{
#if DEBUG
MessageService.ShowWarning("Broken HashAlgorithm object in HashingStreamEx.");
#endif
m_hash = null;
}
}