1 files changed, 2 insertions, 6 deletions
diff --git a/TwoStepsAuthenticator/CounterAuthenticator.cs b/TwoStepsAuthenticator/CounterAuthenticator.cs
index fffae73..ae67ee5 100644
--- a/TwoStepsAuthenticator/CounterAuthenticator.cs
+++ b/TwoStepsAuthenticator/CounterAuthenticator.cs
@@ -11,14 +11,12 @@ namespace TwoStepsAuthenticator {
     /// </summary>
     public class CounterAuthenticator : Authenticator {
         private readonly int WindowSize;
-        private readonly IUsedCodesManager UsedCodeManager;
 
-        public CounterAuthenticator(int windowSize = 10, IUsedCodesManager usedCodeManager = null) {
+        public CounterAuthenticator(int windowSize = 10) {
             if (windowSize <= 0) {
                 throw new ArgumentException("look-ahead window size must be positive");
             }
 
-            this.UsedCodeManager = (usedCodeManager == null) ? Authenticator.DefaultUsedCodeManager.Value : usedCodeManager;
             this.WindowSize = windowSize;
         }
 
@@ -59,11 +57,9 @@ namespace TwoStepsAuthenticator {
 
             for (uint i = 0; i <= WindowSize; i++) {
                 ulong checkCounter = counter + i;
-                if (ConstantTimeEquals(GetCode(secret, checkCounter), code) && !UsedCodeManager.IsCodeUsed(checkCounter, code)) {
+                if (ConstantTimeEquals(GetCode(secret, checkCounter), code)) {
                     codeMatch = true;
                     successfulSequenceNumber = checkCounter;
-
-                    UsedCodeManager.AddCode(successfulSequenceNumber, code);
                 }
             }