Question

Encrypt.cs

BitmapImage bitmapImage = new BitmapImage(new Uri(this.BaseUri,@"D:\Others\Quotes\1.jpg"));
var plainString = bitmapImage;
string key = txtkey.Text;  // Key
string encryptedString = await EncryptStringHelper(plainString.ToString(), key);   // Encrypt method and get string
txbencrypt.Text = encryptedString;

Decrypt.cs

 string encryptedString = txbencrypt.Text;  // Encrypt  text
 string key = txtkey.Text;   // Same key
 string decryptedString = await DecryptStringHelper(encryptedString, key);
 imgoutput.Source = decryptedString;


    private Task<string> EncryptStringHelper(string plainString, string key)
    {
        try
        {
            var hashKey = GetMD5Hash(key);
            var decryptBuffer = CryptographicBuffer.ConvertStringToBinary(plainString, BinaryStringEncoding.Utf8);
            var AES = SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithmNames.AesEcbPkcs7);
            var symmetricKey = AES.CreateSymmetricKey((IBuffer)hashKey);
            var encryptedBuffer = CryptographicEngine.Encrypt(symmetricKey, decryptBuffer, null);
            var encryptedString = CryptographicBuffer.EncodeToBase64String(encryptedBuffer);
            return Task.Run(() =>
            {
                return encryptedString;
            });
        }
        catch (Exception ex)
        {
            return null;
        }
    }

   public Task<string> DecryptStringHelper(string encryptedString, string key)
    {
        try
        {
            var hashKey = GetMD5Hash(key);
            IBuffer decryptBuffer = CryptographicBuffer.DecodeFromBase64String(encryptedString);
            var AES = SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithmNames.AesEcbPkcs7);
            var symmetricKey = AES.CreateSymmetricKey((IBuffer)hashKey);
            var decryptedBuffer = CryptographicEngine.Decrypt(symmetricKey, decryptBuffer, null);
            string decryptedString = CryptographicBuffer.ConvertBinaryToString(BinaryStringEncoding.Utf8, decryptedBuffer);
            return Task.Run(() =>
            {
                return decryptedString;
            });
        }
        catch (Exception ex)
        {
            return null;
        }
    }

我开发通用Windows应用程序（UWP）然后尝试加密和解密到图像文件，但我转换图像加密文本然后当我将该文本解密为图像时我无法转换。那我该怎么做？

Answer 1

您希望将base 64字符串转换为字节数组，然后从中创建ImageSource。

byte[] data = Convert.FromBase64String(base64string);
if (data.caseImage.Count() > 1)
        {
            MemoryStream ms = new MemoryStream(data.caseImage, 0, data.caseImage.Length);
            BitmapImage img = new BitmapImage();
            var ras = ms.AsRandomAccessStream();
            await img.SetSourceAsync(ras);
            imgCase.Source = img;
        }

imgCase是Xaml图像。

就最初创建base64string而言，你想要做这样的事情：

将BitMapImage转换为ImageSource：

                BitmapImage bitmapCamera = new BitmapImage();
                bitmapCamera.SetSource(streamCamera);
                // Convert the camera bitap to a WriteableBitmap object, 
                // which is often a more useful format.

                int width = bitmapCamera.PixelWidth;
                int height = bitmapCamera.PixelHeight;

                WriteableBitmap wBitmap = new WriteableBitmap(width, height);

                using (var stream = await capturedMedia.OpenAsync(FileAccessMode.Read))
                {
                    wBitmap.SetSource(stream);
                }

                imgPreview.Source = wBitmap;

或者StorageFile到Base64String：

     byte[] fileBytes = null;
     var imageFile = *Your storageFile*;

                    mimetype = imageFile.ContentType;
                    filetype = imageFile.FileType;
                    using (IRandomAccessStreamWithContentType stream = await imageFile.OpenReadAsync())
                    {
                        fileBytes = new byte[stream.Size];
                        using (DataReader reader = new DataReader(stream))
                        {
                            await reader.LoadAsync((uint)stream.Size);
                            reader.ReadBytes(fileBytes);
                        }
                    }
                string base64 = Convert.ToBase64String(fileBytes);

希望这有帮助。

如何在UWP中将字符串转换为image.source？

1 个答案: