/// <summary>
/// Reset the RNGCryptoServiceProvider instance.
/// </summary>
public void Reset()
{
if (_seedGenerator != null)
{
_seedGenerator.Dispose();
_seedGenerator = null;
}
if (_rngGenerator != null)
{
_rngGenerator.Dispose();
_rngGenerator = null;
}
_seedGenerator = GetSeedGenerator(_seedType);
_rngGenerator = new SP20Drbg(_dfnRounds);
if (_seedGenerator != null)
{
_rngGenerator.Initialize(_seedGenerator.GetSeed(_keySize));
}
else
{
_rngGenerator.Initialize(_stateSeed);
}
_rngGenerator.Generate(_byteBuffer);
_bufferIndex = 0;
}
/// <summary>
/// Fill an array with pseudo random bytes
/// </summary>
///
/// <param name="Data">Array to fill with random bytes</param>
public void GetBytes(byte[] Data)
{
lock (_objLock)
{
if (_byteBuffer.Length - _bufferIndex < Data.Length)
{
int bufSize = _byteBuffer.Length - _bufferIndex;
// copy remaining bytes
Buffer.BlockCopy(_byteBuffer, _bufferIndex, Data, 0, bufSize);
int rem = Data.Length - bufSize;
while (rem > 0)
{
// fill buffer
_rngGenerator.Generate(_byteBuffer);
if (rem > _byteBuffer.Length)
{
Buffer.BlockCopy(_byteBuffer, 0, Data, bufSize, _byteBuffer.Length);
bufSize += _byteBuffer.Length;
rem -= _byteBuffer.Length;
}
else
{
Buffer.BlockCopy(_byteBuffer, 0, Data, bufSize, rem);
_bufferIndex = rem;
rem = 0;
}
}
}
else
{
Buffer.BlockCopy(_byteBuffer, _bufferIndex, Data, 0, Data.Length);
_bufferIndex += Data.Length;
}
}
}
