public void KeyIsRecommendedStrengthWhenEncoded(string encodedKey)
{
"When I create a secret key"
.x(() => encodedKey = TestInstance.CreateKey());
"Then the encoded key meets RFC 4226 shared secret recommended length requirement of 160 bits (20 bytes)"
.x(() => encodedKey.ShouldSatisfyAllConditions(
() => encodedKey.Length.ShouldBe(32),
() => TestInstance.DecodeKey(encodedKey).Length.ShouldBe(20)
));
}
public void KeyIsRecommendedLengthWhenEncoded(string encodedKey, byte[] hmacHash)
{
"When I create a secret key"
.x(() => encodedKey = TestInstance.CreateKey());
"And an HMAC hash"
.x(() => hmacHash = Container.Resolve <TotpTokenBuilder>().GenerateSha1Hash(
Faker.Random.Bytes(_hmacKeyByteCount),
BitConverter.GetBytes(Faker.Random.Long(1500000000, 1600000000))));
"Then the secret key is the length of the HMAC output as specified in RFC 6238"
.x(() => TestInstance.DecodeKey(encodedKey).Length.ShouldBe(hmacHash.Length));
}
public void KeyContainsInvalidCharacter(char invalidChar, string encodedKey, Exception ex)
{
"Given a key containing invalid characters for Base32 decoding"
.x(() => encodedKey = new string(invalidChar, 32));
"When I attempt to decode the key"
.x(() => ex = Record.Exception(() => TestInstance.DecodeKey(encodedKey)));
"Then an invalid character exception is thrown"
.x(() => ex.ShouldSatisfyAllConditions(
() => ex.ShouldNotBeNull(),
() => ex.ShouldBeOfType <FormatException>(),
() => ex.Message.ShouldBe("Invalid character"))
);
}
public void KeyIsInvalidLength(int invalidLength, string encodedKey, Exception ex)
{
"Given a key of insufficient length for Base32 decoding"
.x(() => encodedKey = Faker.SecretKey().Substring(0, invalidLength));
"When I attempt to decode the key"
.x(() => ex = Record.Exception(() => TestInstance.DecodeKey(encodedKey)));
"Then an invalid length exception is thrown"
.x(() => ex.ShouldSatisfyAllConditions(
() => ex.ShouldNotBeNull(),
() => ex.ShouldBeOfType <FormatException>(),
() => ex.Message.ShouldBe("Invalid length"))
);
}
