// Test that the random number generator actually works by seeing
// if it generates non-zero byte streams. There is a small non-zero
// probability that a working random number generator will in fact
// generate an all-zero stream, but since that is about 1^-128, the
// chances of it happening by accident are quite rare.
public void TestRNGWorks()
{
if (!CryptoTestCase.RandomWorks())
{
Fail("random number generator does not work");
}
}
// Check that "GetNonZeroBytes" does indeed do that. We generate
// a large amount of random material to increase the chance that
// the underlying generator will generate a zero which needs to
// be corrected by "GetNonZeroBytes". If the random number
// generator doesn't work at all, we avoid running this test so
// that we don't get an infinite loop inside the library.
public void TestRNGNonZeroWorks()
{
if (CryptoTestCase.RandomWorks())
{
int round;
int index;
byte[] rand = new byte [16384];
RandomNumberGenerator rng = RandomNumberGenerator.Create();
for (round = 0; round < 32; ++round)
{
rng.GetNonZeroBytes(rand);
for (index = 0; index < 16; ++index)
{
if (rand[index] == 0x00)
{
Fail("zero byte found in generated stream");
}
}
}
}
}