Use culture-independent prefix-check in MacUtilities.GetMac

- Fix for https://github.com/bcgit/bc-csharp/pull/40 (modified from original patch)

1 files changed, 38 insertions, 0 deletions

diff --git a/crypto/test/src/security/test/TestMacUtil.cs b/crypto/test/src/security/test/TestMacUtil.cs
new file mode 100644

index 000000000..1eb6f35b0
--- /dev/null
+++ b/crypto/test/src/security/test/TestMacUtil.cs
@@ -0,0 +1,38 @@
+using System;
+using System.Globalization;
+using System.Threading;
+
+using NUnit.Framework;
+
+using Org.BouncyCastle.Crypto;
+
+namespace Org.BouncyCastle.Security.Tests
+{
+    [TestFixture]
+    public class TestMacUtilities
+    {
+        [Test]
+        public void TestCultureIndependence()
+        {
+            Thread t = Thread.CurrentThread;
+            CultureInfo ci = t.CurrentCulture;
+            try
+            {
+                /*
+                 * In Hungarian, the "CS" in "HMACSHA256" is linguistically a single character, so "HMAC" is not a prefix.
+                 */
+                t.CurrentCulture = new CultureInfo("hu-HU");
+                IMac mac = MacUtilities.GetMac("HMACSHA256");
+                Assert.NotNull(mac);
+            }
+            catch (Exception e)
+            {
+                Assert.Fail("Culture-specific lookup failed: " + e.Message);
+            }
+            finally
+            {
+                t.CurrentCulture = ci;
+            }
+        }
+    }
+}