コード例 #1
0
ファイル: PngStegoUtil.cs プロジェクト: jujuka/nanoboard
        public void HideBytesInPng(Image innocuousBmp, string outputImageFileName, byte[] hiddenBytes)
        {
            hiddenBytes = ByteEncryptionUtil.EncryptSalsa20(hiddenBytes, _key);
            byte[] hiddenLengthBytes    = BitConverter.GetBytes(hiddenBytes.Length);
            byte[] hiddenCombinedBytes  = PngUtils.Combine(hiddenLengthBytes, hiddenBytes);
            byte[] rgbComponents        = PngUtils.RgbComponentsToBytes(innocuousBmp);
            byte[] encodedRgbComponents = EncodeBytes(hiddenCombinedBytes, rgbComponents);
            Bitmap encodedBmp           = PngUtils.ByteArrayToBitmap(encodedRgbComponents, innocuousBmp.Width, innocuousBmp.Height);

            encodedBmp.Save(outputImageFileName, ImageFormat.Png);
            encodedBmp.Dispose();
            innocuousBmp.Dispose();
        }
コード例 #2
0
ファイル: PngStegoUtil.cs プロジェクト: jujuka/nanoboard
        public byte[] ReadHiddenBytesFromPng(string imageFileName)
        {
            Bitmap loadedEncodedBmp = new Bitmap(imageFileName);

            byte[]    loadedEncodedRgbComponents = PngUtils.RgbComponentsToBytes(loadedEncodedBmp);
            const int bytesInInt = 4;

            byte[] loadedHiddenLengthBytes = DecodeBytes(loadedEncodedRgbComponents, 0, bytesInInt);
            int    loadedHiddenLength      = BitConverter.ToInt32(loadedHiddenLengthBytes, 0);

            byte[] loadedHiddenBytes = DecodeBytes(loadedEncodedRgbComponents, bytesInInt, loadedHiddenLength);
            loadedEncodedBmp.Dispose();
            return(ByteEncryptionUtil.DecryptSalsa20(loadedHiddenBytes, _key));
        }
コード例 #3
0
ファイル: PngStegoUtil.cs プロジェクト: Karasiq/nanoboard-1
        public void HideBytesInPng(Image innocuousBmp, string outputImageFileName, byte[] hiddenBytes)
        {
            byte[] hiddenLengthBytes    = BitConverter.GetBytes(hiddenBytes.Length);
            byte[] hiddenCombinedBytes  = PngUtils.Combine(hiddenLengthBytes, hiddenBytes);
            byte[] rgbComponents        = PngUtils.RgbComponentsToBytes(innocuousBmp);
            byte[] encodedRgbComponents = EncodeBytes(hiddenCombinedBytes, rgbComponents);
            Bitmap encodedBmp           = PngUtils.ByteArrayToBitmap(encodedRgbComponents, innocuousBmp.Width, innocuousBmp.Height);

            encodedBmp.Save(outputImageFileName, ImageFormat.Png);
            encodedBmp.Dispose();
            innocuousBmp.Dispose();
            Console.WriteLine("Saved as " + outputImageFileName);
            return;
        }
コード例 #4
0
ファイル: PngStegoUtil.cs プロジェクト: Karasiq/nanoboard-1
        public byte[] ReadHiddenBytesFromPng(Image container)                                                                           //image from RAM
        {
            Bitmap loadedEncodedBmp = container as Bitmap;                                                                              //RGB bitmap from Image

            byte[] loadedEncodedRgbComponents = PngUtils.RgbComponentsToBytes(loadedEncodedBmp);
            loadedEncodedBmp.Dispose();                                                                                                                                 //no need dispose temp bitmap, and this can be disposed now.
            const int bytesInInt = 4;

            byte[] loadedHiddenLengthBytes = DecodeBytes(loadedEncodedRgbComponents, 0, bytesInInt);
            int    loadedHiddenLength      = BitConverter.ToInt32(loadedHiddenLengthBytes, 0);

            byte[] loadedHiddenBytes = DecodeBytes(loadedEncodedRgbComponents, bytesInInt, loadedHiddenLength);
            return(loadedHiddenBytes);
        }
コード例 #5
0
ファイル: PngStegoUtil.cs プロジェクト: Karasiq/nanoboard-1
        public byte[] ReadHiddenBytesFromPng(string imageFileName)                                                              //pathway
        {
            Bitmap loadedEncodedBmp;

            if (                                                                                                                                                                                //if dataURL
                imageFileName.IndexOf("data:") != -1 &&
                imageFileName.IndexOf("base64,") != -1 &&
                nbpack.NBPackMain.IsBase64Encoded(imageFileName.Split(',')[1])
                )
            {
                //create bitmap from dataURL, and save this as PNG-file to Upload folder.
                var base64Data = Regex.Match(imageFileName, @"data:image/(?<type>.+?),(?<data>.+)").Groups["data"].Value;
                var binData    = Convert.FromBase64String(base64Data);

                using (var stream = new MemoryStream(binData))
                {
                    loadedEncodedBmp = new Bitmap(stream);                              //create image from dataURL
                }
            }
            else
            {
/*				//loadedEncodedBmp = new Bitmap(imageFileName);
 *                              Bitmap temp = new Bitmap(imageFileName);	//file will be locked if incorrect
 *                              loadedEncodedBmp = (Bitmap)temp.Clone();	//clone bitmap
 *                              temp.Dispose();                             //now file can be deleted.
 */

                byte[] bytes = System.IO.File.ReadAllBytes(imageFileName);
                System.IO.MemoryStream ms = new System.IO.MemoryStream(bytes);
                //Image img = Image.FromStream(ms);
                //loadedEncodedBmp = img as Bitmap;
                loadedEncodedBmp = new Bitmap(ms);
            }

            byte[]    loadedEncodedRgbComponents = PngUtils.RgbComponentsToBytes(loadedEncodedBmp);
            const int bytesInInt = 4;

            byte[] loadedHiddenLengthBytes = DecodeBytes(loadedEncodedRgbComponents, 0, bytesInInt);
            int    loadedHiddenLength      = BitConverter.ToInt32(loadedHiddenLengthBytes, 0);

            byte[] loadedHiddenBytes = DecodeBytes(loadedEncodedRgbComponents, bytesInInt, loadedHiddenLength);
            loadedEncodedBmp.Dispose();
            return(loadedHiddenBytes);
        }