public void GivenContainer16bppPng_WrongDecryptionKey_ExpectedInvalidOperationExceptionThrown()
{
//Arrange
string outputDirPath = Path.Combine(TestsSetUp.TempDirectory, System.Reflection.MethodBase.GetCurrentMethod().Name);
Directory.CreateDirectory(outputDirPath);
string containerPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "TestData", "Containers",
"254x256_16.png");
string secretPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "TestData", "Secrets",
"gecon.jpg");
var encryptionKey = new PasswordKey("9hwT5nnp");
var decryptionKey = new PasswordKey("GhEP7vgDS");
IStegoSystem <string, ImageStegoConstraints> stegoSystem =
new SudokuImageStegoSystem <byte, string>(new SudokuStegoMethod256(), new SudokuByPasswordMatrixFactory <byte>(),
new Method256ImageStegoConstraints());
string stegocontainerPath = stegoSystem.Encrypt(containerPath, secretPath, encryptionKey, outputDirPath);
//Act & Assert
Assert.Throws(Is.TypeOf <InvalidOperationException>()
.And.Message.EqualTo("Unable to extract secret data. Either the password is wrong or there is no secret data at all"),
() => stegoSystem.Decrypt(stegocontainerPath, decryptionKey, outputDirPath));
}
public void Given_Container16bppPng_UsedCapacityIsLow_ExpectedDecryptedEqualsInitialSecret()
{
//Arrange
string outputDirPath = Path.Combine(TestsSetUp.TempDirectory, System.Reflection.MethodBase.GetCurrentMethod().Name);
Directory.CreateDirectory(outputDirPath);
string containerPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "TestData", "Containers",
"254x256_16.png");
string secretPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "TestData", "Secrets",
"gecon.jpg");
var key = new PasswordKey("aaaaaa");
IStegoSystem <string, ImageStegoConstraints> stegoSystem =
new SudokuImageStegoSystem <byte, string>(new SudokuStegoMethod256(), new SudokuByPasswordMatrixFactory <byte>(),
new Method256ImageStegoConstraints());
//Act
string stegocontainerPath = stegoSystem.Encrypt(containerPath, secretPath, key, outputDirPath);
string restoredSecretPath = stegoSystem.Decrypt(stegocontainerPath, key, outputDirPath);
//Assert
//restored and initial secrets are equal
FileAssert.AreEqual(secretPath, restoredSecretPath);
}
public void GivenContainer24bppBmp_PasswordIsNull_ExpectedArgumentExceptionThrown()
{
//Arrange
string outputDirPath = TestsSetUp.TempDirectory;
string stegocontainerPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "TestData", "Containers",
"158x200_24.bmp");
var key = new PasswordKey(null);
IStegoSystem <string, ImageStegoConstraints> stegoSystem =
new SudokuImageStegoSystem <byte, string>(new SudokuStegoMethod256(), new SudokuByPasswordMatrixFactory <byte>(),
new Method256ImageStegoConstraints());
//Act & Assert
Assert.Throws(Is.TypeOf <ArgumentException>()
.And.Message.Contains("Wrong password format"),
() => stegoSystem.Decrypt(stegocontainerPath, key, outputDirPath));
}
public void GivenEmptyStegoContainer32bppBmp_2_ExpectedInvalidOperationExceptionThrown()
{
//Arrange
string outputDirPath = TestsSetUp.TempDirectory;
string stegocontainerPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "TestData", "Containers",
"490x364_32.bmp");
var key = new PasswordKey("utGpgfC");
IStegoSystem <string, ImageStegoConstraints> stegoSystem =
new SudokuImageStegoSystem <byte, string>(new SudokuStegoMethod256(), new SudokuByPasswordMatrixFactory <byte>(),
new Method256ImageStegoConstraints());
//Act & Assert
Assert.Throws(Is.TypeOf <InvalidOperationException>()
.And.Message.EqualTo("Unable to extract secret data. Either the password is wrong or there is no secret data at all"),
() => stegoSystem.Decrypt(stegocontainerPath, key, outputDirPath));
}
public void Given_Container8bppBmp_ExpectedArgumentExceptionThrown()
{
//Arrange
string outputDirPath = TestsSetUp.TempDirectory;
string containerPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "TestData", "Containers",
"320x235_8.bmp");
string secretPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "TestData", "Secrets",
"gecon.jpg");
var key = new PasswordKey("123456");
IStegoSystem <string, ImageStegoConstraints> stegoSystem =
new SudokuImageStegoSystem <byte, string>(new SudokuStegoMethod256(), new SudokuByPasswordMatrixFactory <byte>(),
new Method256ImageStegoConstraints());
//Act & Assert
Assert.Throws(Is.TypeOf <ArgumentException>()
.And.Message.EqualTo("8 bpp image is not allowed to use as container"),
() => stegoSystem.Encrypt(containerPath, secretPath, key, outputDirPath));
}
public void GivenContainer24bppBmp_PasswordIsTooLong_ExpectedArgumentExceptionThrown()
{
//Arrange
string outputDirPath = TestsSetUp.TempDirectory;
string containerPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "TestData", "Containers",
"158x200_24.bmp");
string secretPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "TestData", "Secrets",
"lemur.jpg");
var key = new PasswordKey("s8uyrf7erFOefueRhiye6gUn9851tyhgyv0utMh");
IStegoSystem <string, ImageStegoConstraints> stegoSystem =
new SudokuImageStegoSystem <byte, string>(new SudokuStegoMethod256(), new SudokuByPasswordMatrixFactory <byte>(),
new Method256ImageStegoConstraints());
//Act & Assert
Assert.Throws(Is.TypeOf <ArgumentException>()
.And.Message.Contains("Wrong password format"),
() => stegoSystem.Encrypt(containerPath, secretPath, key, outputDirPath));
}
public void Given_Container16bppPng_CapacityIsNotEnough_ExpectedInvalidOperationExceptionThrown()
{
//Arrange
string outputDirPath = TestsSetUp.TempDirectory;
string containerPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "TestData", "Containers",
"254x256_16.png");
string secretPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "TestData", "Secrets",
"fox.jpg");
var key = new PasswordKey("123456");
IStegoSystem <string, ImageStegoConstraints> stegoSystem =
new SudokuImageStegoSystem <byte, string>(new SudokuStegoMethod256(), new SudokuByPasswordMatrixFactory <byte>(),
new Method256ImageStegoConstraints());
//Act & Assert
Assert.Throws(Is.TypeOf <InvalidOperationException>()
.And.Message.EqualTo("Cannot encrypt secret data because container image is too small"),
() => stegoSystem.Encrypt(containerPath, secretPath, key, outputDirPath));
}
