/// <summary>
/// encrypts an image
/// </summary>
/// <param name="image">the image that will be encrypted</param>
/// <param name="roIs">the Region of Interests</param>
/// <param name="password">the password used for encryption</param>
/// <param name="cryptoFlags">determines which encryption mode will be applied</param>
/// <param name="errorCode">if an error occurs this value will be set is not 0</param>
/// <returns>returns an encrypted image</returns>
public static Image EncryptJPG(Image image, IList <RoI> roIs, string password, CryptoFlags cryptoFlags, out EnumErrorCode errorCode)
{
// create JpegOperation from business logic
IBusinessLogic businessLogic = new BusinessLogic();
IJpegOperation jpegOperation = businessLogic.CreateJpegOperationBL();
// convert Image to byte array
byte[] in_jpegToEncrypt = jpegOperation.ConvertImageToByteArray(image);
Int32 in_size = in_jpegToEncrypt.Length;
// convert RoIs to the correct format
int counter = 0;
Int32[] in_roiArray = new Int32[roIs.Count() * 4];
foreach (RoI roi in roIs)
{
in_roiArray[(counter * 4) + 0] = roIs[counter].X;
in_roiArray[(counter * 4) + 1] = roIs[counter].Y;
in_roiArray[(counter * 4) + 2] = roIs[counter].Width;
in_roiArray[(counter * 4) + 3] = roIs[counter].Height;
counter++;
}
Int32 in_roiArraySize = roIs.Count() * 4;
// create MD5 hash of the password
MD5 md5 = new MD5CryptoServiceProvider();
byte[] textToHash = Encoding.Default.GetBytes(password);
byte[] in_encryptionKey = md5.ComputeHash(textToHash);
Int32 in_encryptionKeySize = in_encryptionKey.Length;
// convert crypto flags
byte in_cryptoFlags = cryptoFlags.ToByte();
// get memory for the encrypted image
byte[] out_jpegEncrypted = new byte[in_size * 2];
byte[] out_statistics = new byte[in_size];
IntPtr out_jpegEncryptedSize = new IntPtr();
int[] ia2 = new int[1];
GCHandle gch1 = GCHandle.Alloc(ia2);
out_jpegEncryptedSize = Marshal.UnsafeAddrOfPinnedArrayElement(ia2, 0);
// create a pointer for the error code (will be set from C-code)
IntPtr out_errorCode = new IntPtr();
int[] ia = new int[1];
GCHandle gch = GCHandle.Alloc(ia);
out_errorCode = Marshal.UnsafeAddrOfPinnedArrayElement(ia, 0);
// now try to call the encryption algorithm
try
{
encJpeg(
in_jpegToEncrypt,
in_size,
in_roiArray,
in_roiArraySize,
in_encryptionKey,
in_encryptionKeySize,
in_cryptoFlags,
out_jpegEncrypted,
ref out_jpegEncryptedSize,
ref out_errorCode
);
// get the error code
errorCode = ConvertIntToErrorCode(out_errorCode.ToInt32());
// truncate byte array
out_jpegEncrypted = out_jpegEncrypted.Take(out_jpegEncryptedSize.ToInt32()).ToArray();
}
catch
{
throw new EncryptionException("Error while encrypting!");
}
// convert byte array to Image and return
return(jpegOperation.ConvertByteArrayToImage(out_jpegEncrypted));
}
public void Test_Encryption_Swap_Values()
{
IBusinessLogic businessLogic = BLFactory.CreateBusinessLogic();
IJpegOperation jpegOperation = businessLogic.CreateJpegOperationBL();
EnumErrorCode errorCode;
byte[] planeHEX = { 0xff, 0xd8, 0xff, 0xe0, 0x00, 0x10, 0x4a, 0x46, 0x49, 0x46, 0x00, 0x01, 0x01, 0x01, 0x00, 0x60, 0x00, 0x60, 0x00, 0x00, 0xff, 0xe1, 0x00, 0x68, 0x45, 0x78, 0x69, 0x66, 0x00, 0x00, 0x4d, 0x4d, 0x00, 0x2a, 0x00, 0x00, 0x00, 0x08, 0x00, 0x04, 0x01, 0x1a, 0x00, 0x05, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x3e, 0x01, 0x1b, 0x00, 0x05, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x46, 0x01, 0x28, 0x00, 0x03, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x00, 0x01, 0x31, 0x00, 0x02, 0x00, 0x00, 0x00, 0x12, 0x00, 0x00, 0x00, 0x4e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x60, 0x00, 0x00, 0x00, 0x01, 0x50, 0x61, 0x69, 0x6e, 0x74, 0x2e, 0x4e, 0x45, 0x54, 0x20, 0x76, 0x33, 0x2e, 0x35, 0x2e, 0x31, 0x30, 0x00, 0xff, 0xdb, 0x00, 0x43, 0x00, 0x08, 0x06, 0x06, 0x07, 0x06, 0x05, 0x08, 0x07, 0x07, 0x07, 0x09, 0x09, 0x08, 0x0a, 0x0c, 0x14, 0x0d, 0x0c, 0x0b, 0x0b, 0x0c, 0x19, 0x12, 0x13, 0x0f, 0x14, 0x1d, 0x1a, 0x1f, 0x1e, 0x1d, 0x1a, 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Image image = jpegOperation.ConvertByteArrayToImage(planeHEX);
// set encryptio flags
CryptoFlags cryptoFlags = new CryptoFlags()
{
DcCoeffCrypto = false,
SwapBlock = false,
SwapCWVPair = false,
SwapValues = true
};
// check encryption calls
Image encryptedImage = Bridge.EncryptJPG(image, new List<RoI>(), "Password", cryptoFlags, out errorCode);
Byte[] encryptedImageByteArray = jpegOperation.ConvertImageToByteArray(encryptedImage);
// check decryption calls
Image decryptedImage = Bridge.DecryptJPG(encryptedImage, new List<RoI>(), "Password", cryptoFlags, out errorCode);
Byte[] decryptedImageByteArray = jpegOperation.ConvertImageToByteArray(decryptedImage);
// check result
for (int i = 0; i < planeHEX.Length; i++)
Assert.IsTrue(planeHEX[i] == decryptedImageByteArray[i]);
}
/// <summary>
/// encrypts an image
/// </summary>
/// <param name="image">the image that will be encrypted</param>
/// <param name="roIs">the Region of Interests</param>
/// <param name="password">the password used for encryption</param>
/// <param name="cryptoFlags">determines which encryption mode will be applied</param>
/// <param name="errorCode">if an error occurs this value will be set is not 0</param>
/// <returns>returns an encrypted image</returns>
public static Image EncryptJPG(Image image, IList<RoI> roIs, string password, CryptoFlags cryptoFlags, out EnumErrorCode errorCode)
{
// create JpegOperation from business logic
IBusinessLogic businessLogic = new BusinessLogic();
IJpegOperation jpegOperation = businessLogic.CreateJpegOperationBL();
// convert Image to byte array
byte[] in_jpegToEncrypt = jpegOperation.ConvertImageToByteArray(image);
Int32 in_size = in_jpegToEncrypt.Length;
// convert RoIs to the correct format
int counter = 0;
Int32[] in_roiArray = new Int32[roIs.Count() * 4];
foreach (RoI roi in roIs)
{
in_roiArray[(counter * 4) + 0] = roIs[counter].X;
in_roiArray[(counter * 4) + 1] = roIs[counter].Y;
in_roiArray[(counter * 4) + 2] = roIs[counter].Width;
in_roiArray[(counter * 4) + 3] = roIs[counter].Height;
counter++;
}
Int32 in_roiArraySize = roIs.Count() * 4;
// create MD5 hash of the password
MD5 md5 = new MD5CryptoServiceProvider();
byte[] textToHash = Encoding.Default.GetBytes(password);
byte[] in_encryptionKey = md5.ComputeHash(textToHash);
Int32 in_encryptionKeySize = in_encryptionKey.Length;
// convert crypto flags
byte in_cryptoFlags = cryptoFlags.ToByte();
// get memory for the encrypted image
byte[] out_jpegEncrypted = new byte[in_size*2];
byte[] out_statistics = new byte[in_size];
IntPtr out_jpegEncryptedSize = new IntPtr();
int[] ia2 = new int[1];
GCHandle gch1 = GCHandle.Alloc(ia2);
out_jpegEncryptedSize = Marshal.UnsafeAddrOfPinnedArrayElement(ia2, 0);
// create a pointer for the error code (will be set from C-code)
IntPtr out_errorCode = new IntPtr();
int[] ia = new int[1];
GCHandle gch = GCHandle.Alloc(ia);
out_errorCode = Marshal.UnsafeAddrOfPinnedArrayElement(ia, 0);
// now try to call the encryption algorithm
try
{
encJpeg(
in_jpegToEncrypt,
in_size,
in_roiArray,
in_roiArraySize,
in_encryptionKey,
in_encryptionKeySize,
in_cryptoFlags,
out_jpegEncrypted,
ref out_jpegEncryptedSize,
ref out_errorCode
);
// get the error code
errorCode = ConvertIntToErrorCode(out_errorCode.ToInt32());
// truncate byte array
out_jpegEncrypted = out_jpegEncrypted.Take(out_jpegEncryptedSize.ToInt32()).ToArray();
}
catch
{
throw new EncryptionException("Error while encrypting!");
}
// convert byte array to Image and return
return jpegOperation.ConvertByteArrayToImage(out_jpegEncrypted);
}
public void Test_Encryption_Test_JPG_progressive()
{
// get JPG image with progressive format
Image image = Image.FromFile(pathToProgressiveJpgImage);
// set encryption flags
CryptoFlags cryptoFlags = new CryptoFlags();
// init error code
EnumErrorCode errorCode = EnumErrorCode.SUCCESS;
// check encryption calls
Image encryptedImage = Bridge.EncryptJPG(image, new List<RoI>(), "Password", cryptoFlags, out errorCode);
// if an error occurs: encryptedImage is null
Assert.IsNull(encryptedImage);
// check correct error message
Assert.IsTrue(errorCode == EnumErrorCode.UNSUPPORTED);
}
