public void Generate_YieldsExpectedResults()
{
//Values taken from RFC specification
byte[] secret = Encoding.ASCII.GetBytes("12345678901234567890");
//Item1 = secretKey,
//Item2 = counter,
//Item3 = expected result.
List <Tuple <byte[], uint, uint> > testValues = new List <Tuple <byte[], uint, uint> >()
{
new Tuple <byte[], uint, uint>(secret, 0, 755224),
new Tuple <byte[], uint, uint>(secret, 1, 287082),
new Tuple <byte[], uint, uint>(secret, 2, 359152),
new Tuple <byte[], uint, uint>(secret, 3, 969429),
new Tuple <byte[], uint, uint>(secret, 4, 338314),
new Tuple <byte[], uint, uint>(secret, 5, 254676),
new Tuple <byte[], uint, uint>(secret, 6, 287922),
new Tuple <byte[], uint, uint>(secret, 7, 162583),
new Tuple <byte[], uint, uint>(secret, 8, 399871),
new Tuple <byte[], uint, uint>(secret, 9, 520489),
};
foreach (var testValue in testValues)
{
string result = HmacOneTimePassword.Generate(testValue.Item1, testValue.Item2, new HMACSHA1(), OneTimePasswordLength.SixDigits);
Assert.AreEqual(result, testValue.Item3.ToString());
}
}
public void Generate_DefaultsToHmacSha1Algorithm()
{
byte[] secretKey = new byte[] { 0 };
string result1 = HmacOneTimePassword.Generate(secretKey, 1, new HMACSHA1());
string result2 = HmacOneTimePassword.Generate(secretKey, 1);
Assert.AreEqual(result1, result2);
}
/// <summary>
/// Generates a new one time password from the supplied data.
/// </summary>
/// <param name="secretKey">The secret key to use in the HMAC</param>
/// <param name="hmac">The hmac algorithm to use</param>
/// <param name="dt">The date and time to generate a code for</param>
/// <param name="offset">Any offsets that should be applied to the supplie date time</param>
/// <param name="timeStep">The timestep value to use to calculate the current step</param>
/// <param name="otpLength">The required legnth of the returned passcode</param>
/// <returns>A one time password code</returns>
/// <exception cref="System.ArgumentNullException">Thrown if hmac or secret key is null</exception>
/// <exception cref="System.ArgumentException">Thrown if secret key is empty, optLength is
/// not defined value or timeStep is less than 1 second.</exception>
public static string Generate(byte[] secretKey, HMAC hmac, DateTime dt, TimeSpan offset, TimeSpan timeStep, OneTimePasswordLength otpLength)
{
#region Input validation
Insist.IsNotNull(hmac, "hmac");
Insist.IsNotNull(secretKey, "secretKey");
Insist.IsNotEmpty(secretKey, "secretKey");
Insist.IsDefined <OneTimePasswordLength>(otpLength, "optLength");
Insist.IsAtLeast(timeStep.TotalSeconds, 1, "timeStep");
#endregion
dt = dt + offset;
ulong stepNumber = (ulong)Math.Floor((double)dt.ToUnixTime() / (double)timeStep.TotalSeconds);
return(HmacOneTimePassword.Generate(secretKey, stepNumber, hmac, otpLength));
}
public void Generate_UndefinedHOTPLengthThrowsException()
{
HmacOneTimePassword.Generate(new byte[] { 0 }, 0, new HMACSHA1(), 0);
}
public void Generate_EmptySecretKeyThrowsException()
{
HmacOneTimePassword.Generate(new byte[0], 0, new HMACSHA1());
}
public void Generate_NullSecretKeyThrowsException()
{
HmacOneTimePassword.Generate(null, 0, new HMACSHA1());
}
public void Generate_NullHmacThrowsException()
{
HmacOneTimePassword.Generate(new byte[] { 0 }, 0, null);
}
public void Generate_CanGenerateEightDigitCodes()
{
string result = HmacOneTimePassword.Generate(new byte[] { 0 }, 1, new HMACSHA1(), OneTimePasswordLength.EightDigits);
Assert.IsTrue(result.Length == 8);
}
public void Generate_DefaultsToSixDigitCode()
{
string result = HmacOneTimePassword.Generate(new byte[] { 0 }, 1);
Assert.IsTrue(result.Length == 6);
}