public void WebSocketFrame_ApplyMask_ExpectedOutput()
{
// Arbitrarily chosen bytes
// Masking key is supposed to be cryptographically secure and crafted from
// a high entropy randomness source but for tests it's fine if it's hardcoded
byte[] k = new byte[4] {
0b01101001, 0b11100001, 0b11010001, 0b00011010
};
// Arbitrarily chosen bytes that represent data
byte[] plain = new byte[6] {
0b11011010, 0b11110011, 0b01010010, 0b00010011, 0b00001111, 0b11111111
};
byte[] expectedMasked = new byte[plain.Length];
// Hardcode expected output to avoid error that may arise from an algorithm
expectedMasked[0] = (byte)(plain[0] ^ k[0]);
expectedMasked[1] = (byte)(plain[1] ^ k[1]);
expectedMasked[2] = (byte)(plain[2] ^ k[2]);
expectedMasked[3] = (byte)(plain[3] ^ k[3]);
expectedMasked[4] = (byte)(plain[4] ^ k[0]);
expectedMasked[5] = (byte)(plain[5] ^ k[1]);
byte[] masked = WebSocketFrame.ApplyMask(plain, k);
Assert.True(expectedMasked.SequenceEqual(masked), "Masking algorithm didn't produce expected output");
}
public void WebSocketFrame_ApplyMask_RevertInput()
{
Random rnd = new Random();
byte[] original_rndContent = new byte[100];
rnd.NextBytes(original_rndContent);
byte[] k = new byte[4];
rnd.NextBytes(k);
byte[] masked = WebSocketFrame.ApplyMask(original_rndContent, k);
byte[] reverted = WebSocketFrame.ApplyMask(masked, k);
Assert.True(original_rndContent.SequenceEqual(reverted), "The masking algorithm didn't yeild the original data when applying the algorithm on masked data");
}
