/// <summary>
/// Fill an array with pseudo random bytes
/// </summary>
///
/// <param name="Size">Size of requested byte array</param>
///
/// <returns>A pseudo random byte array</returns>
public byte[] GetBytes(int Size)
{
byte[] data = new byte[Size];
m_rndGenerator.Generate(data);
return(data);
}
/// <summary>
/// Reset the SP20Prng instance
/// </summary>
public void Reset()
{
if (m_seedGenerator != null)
{
m_seedGenerator.Dispose();
m_seedGenerator = null;
}
if (m_rngGenerator != null)
{
m_rngGenerator.Dispose();
m_rngGenerator = null;
}
m_seedGenerator = GetSeedGenerator(m_seedType);
m_rngGenerator = new SBG(m_rndCount);
if (m_seedGenerator != null)
{
m_rngGenerator.Initialize(m_seedGenerator.GetBytes(m_keySize));
}
else
{
m_rngGenerator.Initialize(m_stateSeed);
}
m_rngGenerator.Generate(m_byteBuffer);
m_bufferIndex = 0;
}
/// <summary>
/// Outputs expected values for the SP20Drbg
/// </summary>
public string GetSP20Vector(int KeySize)
{
SBG spd = new SBG();
byte[] key = new byte[KeySize];
byte[] output = new byte[1024];
for (int i = 0; i < KeySize; i++)
{
key[i] = (byte)i;
}
spd.Initialize(key);
spd.Generate(output);
while (output.Length > 32)
{
output = Reduce(output);
}
return(HexConverter.ToString(output));
}
/// <summary>
/// Fill an array with pseudo random bytes
/// </summary>
///
/// <param name="Output">Array to fill with random bytes</param>
public void GetBytes(byte[] Output)
{
lock (m_objLock)
{
if (m_byteBuffer.Length - m_bufferIndex < Output.Length)
{
int bufSize = m_byteBuffer.Length - m_bufferIndex;
// copy remaining bytes
Buffer.BlockCopy(m_byteBuffer, m_bufferIndex, Output, 0, bufSize);
int rem = Output.Length - bufSize;
while (rem > 0)
{
// fill buffer
m_rngGenerator.Generate(m_byteBuffer);
if (rem > m_byteBuffer.Length)
{
Buffer.BlockCopy(m_byteBuffer, 0, Output, bufSize, m_byteBuffer.Length);
bufSize += m_byteBuffer.Length;
rem -= m_byteBuffer.Length;
}
else
{
Buffer.BlockCopy(m_byteBuffer, 0, Output, bufSize, rem);
m_bufferIndex = rem;
rem = 0;
}
}
}
else
{
Buffer.BlockCopy(m_byteBuffer, m_bufferIndex, Output, 0, Output.Length);
m_bufferIndex += Output.Length;
}
}
}
