Add BerBitString and improve "unused bit" handling

1 files changed, 102 insertions, 16 deletions

diff --git a/crypto/test/src/asn1/test/BitStringTest.cs b/crypto/test/src/asn1/test/BitStringTest.cs
index 3a2dc3156..fccaf8fa0 100644
--- a/crypto/test/src/asn1/test/BitStringTest.cs
+++ b/crypto/test/src/asn1/test/BitStringTest.cs
@@ -4,44 +4,132 @@ using System.IO;
 using NUnit.Framework;
 
 using Org.BouncyCastle.Asn1.X509;
+using Org.BouncyCastle.Utilities;
+using Org.BouncyCastle.Utilities.Encoders;
 using Org.BouncyCastle.Utilities.Test;
 
 namespace Org.BouncyCastle.Asn1.Tests
 {
     [TestFixture]
     public class BitStringTest
-        : ITest
+        : SimpleTest
     {
-        public ITestResult Perform()
+        private void DoTestZeroLengthStrings()
+        {
+            // basic construction
+            DerBitString s1 = new DerBitString(new byte[0], 0);
+
+            s1.GetBytes();
+
+            if (!Arrays.AreEqual(s1.GetEncoded(), Hex.Decode("030100")))
+            {
+                Fail("zero encoding wrong");
+            }
+
+            try
+            {
+                new DerBitString(null, 1);
+                Fail("exception not thrown");
+            }
+            catch (ArgumentNullException e)
+            {
+                //if (!"data cannot be null".Equals(e.Message))
+                //{
+                //    Fail("Unexpected exception");
+                //}
+            }
+
+            try
+            {
+                new DerBitString(new byte[0], 1);
+                Fail("exception not thrown");
+            }
+            catch (ArgumentException e)
+            {
+                //if (!"zero length data with non-zero pad bits".Equals(e.Message))
+                //{
+                //    Fail("Unexpected exception");
+                //}
+            }
+
+            try
+            {
+                new DerBitString(new byte[1], 8);
+                Fail("exception not thrown");
+            }
+            catch (ArgumentException e)
+            {
+                //if (!"pad bits cannot be greater than 7 or less than 0".Equals(e.Message))
+                //{
+                //    Fail("Unexpected exception");
+                //}
+            }
+
+            DerBitString s2 = new DerBitString(0);
+            if (!Arrays.AreEqual(s1.GetEncoded(), s2.GetEncoded()))
+            {
+                Fail("zero encoding wrong");
+            }
+        }
+
+        private void DoTestRandomPadBits()
+        {
+            byte[] test = Hex.Decode("030206c0");
+
+            byte[] test1 = Hex.Decode("030206f0");
+            byte[] test2 = Hex.Decode("030206c1");
+            byte[] test3 = Hex.Decode("030206c7");
+            byte[] test4 = Hex.Decode("030206d1");
+
+            EncodingCheck(test, test1);
+            EncodingCheck(test, test2);
+            EncodingCheck(test, test3);
+            EncodingCheck(test, test4);
+        }
+
+        private void EncodingCheck(byte[] derData, byte[] dlData)
+        {
+            if (Arrays.AreEqual(derData, Asn1Object.FromByteArray(dlData).GetEncoded()))
+            {
+                //Fail("failed DL check");
+                Fail("failed BER check");
+            }
+            if (!Arrays.AreEqual(derData, Asn1Object.FromByteArray(dlData).GetDerEncoded()))
+            {
+                Fail("failed DER check");
+            }
+        }
+
+        public override void PerformTest()
         {
             KeyUsage k = new KeyUsage(KeyUsage.DigitalSignature);
             if ((k.GetBytes()[0] != (byte)KeyUsage.DigitalSignature) || (k.PadBits != 7))
             {
-                return new SimpleTestResult(false, Name + ": failed digitalSignature");
+                Fail("failed digitalSignature");
             }
 
             k = new KeyUsage(KeyUsage.NonRepudiation);
             if ((k.GetBytes()[0] != (byte)KeyUsage.NonRepudiation) || (k.PadBits != 6))
             {
-                return new SimpleTestResult(false, Name + ": failed nonRepudiation");
+                Fail("failed nonRepudiation");
             }
 
             k = new KeyUsage(KeyUsage.KeyEncipherment);
             if ((k.GetBytes()[0] != (byte)KeyUsage.KeyEncipherment) || (k.PadBits != 5))
             {
-                return new SimpleTestResult(false, Name + ": failed keyEncipherment");
+                Fail("failed keyEncipherment");
             }
 
             k = new KeyUsage(KeyUsage.CrlSign);
             if ((k.GetBytes()[0] != (byte)KeyUsage.CrlSign)  || (k.PadBits != 1))
             {
-                return new SimpleTestResult(false, Name + ": failed cRLSign");
+                Fail("failed cRLSign");
             }
 
             k = new KeyUsage(KeyUsage.DecipherOnly);
             if ((k.GetBytes()[1] != (byte)(KeyUsage.DecipherOnly >> 8))  || (k.PadBits != 7))
             {
-                return new SimpleTestResult(false, Name + ": failed decipherOnly");
+                Fail("failed decipherOnly");
             }
 
 			// test for zero length bit string
@@ -51,27 +139,25 @@ namespace Org.BouncyCastle.Asn1.Tests
 			}
 			catch (IOException e)
 			{
-				return new SimpleTestResult(false, Name + ": " + e);
+				Fail(e.ToString());
 			}
 
-            return new SimpleTestResult(true, Name + ": Okay");
+            DoTestRandomPadBits();
+            DoTestZeroLengthStrings();
         }
 
-        public string Name
+        public override string Name
         {
 			get { return "BitString"; }
         }
 
-		public static void Main(
+        public static void Main(
             string[] args)
         {
-            ITest test = new BitStringTest();
-            ITestResult result = test.Perform();
-
-			Console.WriteLine(result);
+            RunTest(new BitStringTest());
         }
 
-		[Test]
+        [Test]
         public void TestFunction()
         {
             string resultText = Perform().ToString();