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-rw-r--r--TwoStepsAuthenticator/CounterAuthenticator.cs27
1 files changed, 18 insertions, 9 deletions
diff --git a/TwoStepsAuthenticator/CounterAuthenticator.cs b/TwoStepsAuthenticator/CounterAuthenticator.cs
index fffae73..7fad752 100644
--- a/TwoStepsAuthenticator/CounterAuthenticator.cs
+++ b/TwoStepsAuthenticator/CounterAuthenticator.cs
@@ -4,17 +4,21 @@ using System.Linq;
using System.Text;
using System.Threading.Tasks;
-namespace TwoStepsAuthenticator {
+namespace TwoStepsAuthenticator
+{
/// <summary>
/// Implementation of RFC 4226 Counter-Based One-Time Password Algorithm
/// </summary>
- public class CounterAuthenticator : Authenticator {
+ public class CounterAuthenticator : Authenticator
+ {
private readonly int WindowSize;
private readonly IUsedCodesManager UsedCodeManager;
- public CounterAuthenticator(int windowSize = 10, IUsedCodesManager usedCodeManager = null) {
- if (windowSize <= 0) {
+ public CounterAuthenticator(IUsedCodesManager usedCodeManager = null, int windowSize = 10)
+ {
+ if (windowSize <= 0)
+ {
throw new ArgumentException("look-ahead window size must be positive");
}
@@ -28,7 +32,8 @@ namespace TwoStepsAuthenticator {
/// <param name="secret">Shared Secret</param>
/// <param name="counter">Current Counter</param>
/// <returns>OTP</returns>
- public string GetCode(string secret, ulong counter) {
+ public string GetCode(string secret, ulong counter)
+ {
return GetCodeInternal(secret, counter);
}
@@ -39,7 +44,8 @@ namespace TwoStepsAuthenticator {
/// <param name="code">OTP</param>
/// <param name="counter">Current Counter Position</param>
/// <returns>true if any code from counter to counter + WindowSize matches</returns>
- public bool CheckCode(string secret, string code, ulong counter) {
+ public bool CheckCode(string secret, string code, ulong counter)
+ {
ulong successfulSequenceNumber = 0uL;
return CheckCode(secret, code, counter, out successfulSequenceNumber);
@@ -53,13 +59,16 @@ namespace TwoStepsAuthenticator {
/// <param name="counter">Current Counter Position</param>
/// <param name="usedCounter">Matching counter value if successful</param>
/// <returns>true if any code from counter to counter + WindowSize matches</returns>
- public bool CheckCode(string secret, string code, ulong counter, out ulong usedCounter) {
+ public bool CheckCode(string secret, string code, ulong counter, out ulong usedCounter)
+ {
var codeMatch = false;
ulong successfulSequenceNumber = 0uL;
- for (uint i = 0; i <= WindowSize; i++) {
+ 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) && !UsedCodeManager.IsCodeUsed(checkCounter, code))
+ {
codeMatch = true;
successfulSequenceNumber = checkCounter;