Merge branch 'master' of https://github.com/dusk0r/TwoStepsAuthenticator

Conflicts:
	README.md
	TwoStepsAuthenticator.UnitTests/UsedCodesManagerTests.cs
	TwoStepsAuthenticator/CounterAuthenticator.cs

1 files changed, 13 insertions, 0 deletions

diff --git a/TwoStepsAuthenticator.UnitTests/TimeAuthenticatorTests.cs b/TwoStepsAuthenticator.UnitTests/TimeAuthenticatorTests.cs
index 55be883..99d1957 100644
--- a/TwoStepsAuthenticator.UnitTests/TimeAuthenticatorTests.cs
+++ b/TwoStepsAuthenticator.UnitTests/TimeAuthenticatorTests.cs
@@ -37,10 +37,23 @@ namespace TwoStepsAuthenticator.UnitTests
             var code = authenticator.GetCode(secret);
 
             authenticator.CheckCode(secret, code);
+
             Assert.AreEqual(mockUsedCodesManager.LastChallenge, 0uL);
             Assert.AreEqual(mockUsedCodesManager.LastCode, code);
         }
 
+        [Test]
+        public void Prevent_code_reuse() {
+            var date = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+            var usedCodesManager = new UsedCodesManager();
+            var authenticator = new TimeAuthenticator(() => date, usedCodeManager: usedCodesManager);
+            var secret = Authenticator.GenerateKey();
+            var code = authenticator.GetCode(secret);
+
+            Assert.IsTrue(authenticator.CheckCode(secret, code));
+            Assert.IsFalse(authenticator.CheckCode(secret, code));
+        }
+
         // Test Vectors from http://tools.ietf.org/html/rfc6238#appendix-B have all length 8. We want a length of 6.
         // This Test Vectors are from a Ruby implementation. They work with the Google Authentificator app.
         [TestCase("DRMK64PPMMC7TDZF", "2013-12-04 18:33:01 +0100", "661188")]