private void CheckSecureRandom(CryptoCodec codec, int len)
{
byte[] rand = new byte[len];
byte[] rand1 = new byte[len];
codec.GenerateSecureRandom(rand);
codec.GenerateSecureRandom(rand1);
Assert.Equal(len, rand.Length);
Assert.Equal(len, rand1.Length);
NUnit.Framework.Assert.IsFalse(Arrays.Equals(rand, rand1));
}
