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using System;
using NUnit.Framework;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Crypto.Paddings;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Utilities.Encoders;
using Org.BouncyCastle.Utilities.Test;
namespace Org.BouncyCastle.Crypto.Tests
{
/**
* General Padding tests.
*/
[TestFixture]
public class PaddingTest : SimpleTest
{
public PaddingTest()
{
}
private void blockCheck(
PaddedBufferedBlockCipher cipher,
IBlockCipherPadding padding,
KeyParameter key,
byte[] data)
{
byte[] outBytes = new byte[data.Length + 8];
byte[] dec = new byte[data.Length];
try
{
cipher.Init(true, key);
int len = cipher.ProcessBytes(data, 0, data.Length, outBytes, 0);
len += cipher.DoFinal(outBytes, len);
cipher.Init(false, key);
int decLen = cipher.ProcessBytes(outBytes, 0, len, dec, 0);
decLen += cipher.DoFinal(dec, decLen);
if (!AreEqual(data, dec))
{
Fail("failed to decrypt - i = " + data.Length + ", padding = " + padding.PaddingName);
}
}
catch (Exception e)
{
Fail("Exception - " + e.ToString(), e);
}
}
public void doTestPadding(
IBlockCipherPadding padding,
SecureRandom rand,
byte[] ffVector,
byte[] ZeroVector)
{
PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new DesEngine(), padding);
KeyParameter key = new KeyParameter(Hex.Decode("0011223344556677"));
//
// ff test
//
byte[] data = { (byte)0xff, (byte)0xff, (byte)0xff, (byte)0, (byte)0, (byte)0, (byte)0, (byte)0 };
if (ffVector != null)
{
padding.AddPadding(data, 3);
if (!AreEqual(data, ffVector))
{
Fail("failed ff test for " + padding.PaddingName);
}
}
//
// zero test
//
if (ZeroVector != null)
{
data = new byte[8];
padding.AddPadding(data, 4);
if (!AreEqual(data, ZeroVector))
{
Fail("failed zero test for " + padding.PaddingName);
}
}
for (int i = 1; i != 200; i++)
{
data = new byte[i];
rand.NextBytes(data);
blockCheck(cipher, padding, key, data);
}
}
public override void PerformTest()
{
SecureRandom rand = new SecureRandom(new byte[20]);
rand.SetSeed(DateTime.Now.Ticks);
doTestPadding(new Pkcs7Padding(), rand,
Hex.Decode("ffffff0505050505"),
Hex.Decode("0000000004040404"));
Pkcs7Padding padder = new Pkcs7Padding();
try
{
padder.PadCount(new byte[8]);
Fail("invalid padding not detected");
}
catch (InvalidCipherTextException e)
{
if (!"pad block corrupted".Equals(e.Message))
{
Fail("wrong exception for corrupt padding: " + e);
}
}
doTestPadding(new ISO10126d2Padding(), rand,
null,
null);
doTestPadding(new X923Padding(), rand,
null,
null);
doTestPadding(new TbcPadding(), rand,
Hex.Decode("ffffff0000000000"),
Hex.Decode("00000000ffffffff"));
doTestPadding(new ZeroBytePadding(), rand,
Hex.Decode("ffffff0000000000"),
null);
doTestPadding(new ISO7816d4Padding(), rand,
Hex.Decode("ffffff8000000000"),
Hex.Decode("0000000080000000"));
}
public override string Name
{
get { return "PaddingTest"; }
}
public static void Main(
string[] args)
{
RunTest(new PaddingTest());
}
[Test]
public void TestFunction()
{
string resultText = Perform().ToString();
Assert.AreEqual(Name + ": Okay", resultText);
}
}
}
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