public void ConfirmBigEndianTransformation(int timeStep, byte[] timeCounter)
{
"Given a time step of 30 seconds"
.x(() => timeStep = 30);
"And a current UTC Time at the second time step"
.x(() => DateTime.SetupGet(x => x.UtcNow)
.Returns(new DateTime(1970, 1, 1, 0, 1, 0, DateTimeKind.Utc)));
"When I generate a TOTP time counter"
.x(() => timeCounter = TestInstance.CreateCounter(timeStep));
"Then an 8-byte counter is generated as specified in RFC 4226"
.x(() => timeCounter.Length.ShouldBe(8));
"And the counter is big-endian as specified in RFC 4226"
.x(() => timeCounter.ShouldSatisfyAllConditions(
() => timeCounter[0].ShouldBe(0),
() => timeCounter[1].ShouldBe(0),
() => timeCounter[2].ShouldBe(0),
() => timeCounter[3].ShouldBe(0),
() => timeCounter[4].ShouldBe(0),
() => timeCounter[5].ShouldBe(0),
() => timeCounter[6].ShouldBe(0),
() => timeCounter[7].ShouldBeGreaterThan(0)
));
}
public void ComputeTimeCounterBeyondYear2038(int year, int timeStep, Exception ex)
{
"Given UTC Time beyond the year 2038"
.x(() => DateTime.SetupGet(x => x.UtcNow)
.Returns(new DateTime(year, 1, 1, 0, 0, 0, DateTimeKind.Utc)));
"And a random valid time step"
.x(() => timeStep = Faker.Random.Int(15, 60));
"When I generate a TOTP time counter"
.x(x => ex = Record.Exception(() => TestInstance.CreateCounter(timeStep)));
"Then a time counter is created without error as specified in RFC 6238"
.x(() => ex.ShouldBeNull());
}
public void ComputeTimeCounter(int unixMinutes, int unixSeconds, long expectedTimeCounter,
int timeStep, byte[] timeCounter)
{
"Given UTC Time"
.x(() => DateTime.SetupGet(x => x.UtcNow)
.Returns(new DateTime(1970, 1, 1, 0, unixMinutes, unixSeconds, DateTimeKind.Utc)));
"And a time step of 30 seconds"
.x(() => timeStep = 30);
"When I generate a TOTP time counter"
.x(() => timeCounter = TestInstance.CreateCounter(timeStep));
"Then the time counter should be in an increment of the time step as specified in RFC 6238"
.x(() => timeCounter[7].ShouldBe((byte)expectedTimeCounter));
}
