public void It_should_return_the_Hmac_if_only_one_iteration_is_specified()
{
var salt = new byte[] { 0, 1, 2, 3, 4, 5 };
var result = SecurityExtensions.Pbkdf2(new byte[0], (r, k, s) => s.CopyTo(r, 0), salt, 1, 6);
CollectionAssert.AreEqual(salt, result);
}
public void It_should_not_assume_non_modification_of_key_and_salt_by_Hmac()
{
var key = new byte[] { 1, 2, 3, 4 };
var salt = new byte[] { 5, 6, 7, 8 };
SecurityExtensions.Pbkdf2(key, (r, k, s) => {
CollectionAssert.AreEqual(key, k, "key does not match passed parameter");
Assert.AreNotSame(key, k, "key references the same array as passed parameter");
CollectionAssert.AreEqual(salt, s, "salt does not match passed parameter");
Assert.AreNotSame(salt, s, "salt references the same array as passed parameter");
}, salt, 1, 4);
}
public void It_should_xor_the_results_of_the_hmac_to_produce_a_result()
{
var salts = new byte[][] { new byte[] { 0x01, 0x01, 0x01, 0x01 },
new byte[] { 0x02, 0x01, 0x02, 0x02 },
new byte[] { 0x04, 0x01, 0x03, 0x01 } };
var expected = new byte[] { 0x07, 0x01, 0x00, 0x02 };
int iteration = 0;
var result = SecurityExtensions.Pbkdf2(new byte[0], (r, k, s) => {
salts[iteration++].CopyTo(r, 0);
}, new byte[0], 3, 4);
CollectionAssert.AreEqual(expected, result);
}
public void It_should_pass_key_and_salt_to_Hmac_first_iteration()
{
var key = new byte[] { 1, 2, 3, 4, 5 };
var salt = new byte[] { 6, 7, 8, 9, 0 };
bool hmacCalled = false;
SecurityExtensions.Pbkdf2(key, (r, k, s) => {
CollectionAssert.AreEqual(key, k);
CollectionAssert.AreEqual(salt, s);
hmacCalled = true;
s.CopyTo(r, 0);
}, salt, 1, 5);
Assert.IsTrue(hmacCalled, "HMAC function was not called to verify key/salt values");
}
public void It_should_pass_the_result_of_Hmac_as_salt_to_next_iteration()
{
int hmacCalled = 0;
var salt = new byte[] { 1, 2, 3, 4, 5 };
var newSalt = new byte[] { 6, 7, 8, 9, 10 };
SecurityExtensions.Pbkdf2(new byte[0], (r, k, s) => {
if (hmacCalled == 0)
{
CollectionAssert.AreEqual(salt, s);
}
else
{
CollectionAssert.AreEqual(newSalt, s);
}
hmacCalled++;
newSalt.CopyTo(r, 0);
}, salt, 2, 5);
Assert.IsTrue(hmacCalled == 2, "HMAC function was not called the correct number of times");
}
public void It_should_throw_if_password_is_null()
{
Assert.ThrowsException <ArgumentNullException>(() => SecurityExtensions.Pbkdf2((byte[])null, (r, k, s) => { }, new byte[0], 1, 1));
Assert.ThrowsException <ArgumentNullException>(() => SecurityExtensions.Pbkdf2((string)null, (r, k, s) => { }, new byte[0], 1, 1));
}