/// <summary>
/// Get <paramref name="uRequestedCount" /> random bytes.
/// </summary>
/// <param name="uRequestedCount">Number of random bytes to retrieve.</param>
/// <returns>Returns <paramref name="uRequestedCount" /> random bytes.</returns>
public byte[] GetRandomBytes(uint uRequestedCount)
{
if (uRequestedCount == 0)
{
return(new byte[0]);
}
var pbRet = new byte[uRequestedCount];
switch (_algorithm)
{
case CrsAlgorithm.ArcFourVariant:
unchecked
{
for (uint w = 0; w < uRequestedCount; ++w)
{
++_i;
_j += _pbState[_i];
byte t = _pbState[_i]; // Swap entries
_pbState[_i] = _pbState[_j];
_pbState[_j] = t;
t = (byte)(_pbState[_i] + _pbState[_j]);
pbRet[w] = _pbState[t];
}
}
break;
case CrsAlgorithm.Salsa20:
_salsa20.Encrypt(pbRet, pbRet.Length, false);
break;
default:
throw new ArgumentException();
}
return(pbRet);
}
