/// <summary>
/// Embeds the secret image in the OriginalImage.
/// </summary>
public async Task EmbedSecretImage(bool encrypt)
{
var secretImageData = this.EncryptedSecretImage != null
? await ImageUtilities.GetImageData(this.EncryptedSecretImage)
: await ImageUtilities.GetImageData(this.SecretImage);
var originalImageData = await ImageUtilities.GetImageData(this.OriginalImage);
var imageEncoder = new ImageEncoder();
byte[] modifiedImageData;
if (encrypt)
{
modifiedImageData =
imageEncoder.EncodeImage(originalImageData, this.OriginalImage.PixelWidth,
secretImageData, this.OriginalImage.PixelWidth, this.OriginalImage.PixelHeight);
}
else
{
modifiedImageData =
imageEncoder.EncodeImage(originalImageData, this.OriginalImage.PixelWidth,
secretImageData, this.SecretImage.PixelWidth, this.SecretImage.PixelHeight);
}
modifiedImageData = HeaderUtilities.AddHeader(modifiedImageData, this.OriginalImage.PixelWidth, encrypt, 1,
MessageType.MonochromeBmp);
this.ModifiedImage = new WriteableBitmap(this.OriginalImage.PixelWidth, this.OriginalImage.PixelHeight);
using var writeStream = this.ModifiedImage.PixelBuffer.AsStream();
await writeStream.WriteAsync(modifiedImageData, 0, modifiedImageData.Length);
}
/// <summary>
/// Embeds the secret text message.
/// </summary>
public async Task EmbedSecretMessage(int bitsPerColorChannel, bool encrypt)
{
var originalImageData = await ImageUtilities.GetImageData(this.OriginalImage);
var textEncoder = new TextEncoder(bitsPerColorChannel);
var modifiedImageData = textEncoder.EncodeMessage(originalImageData, this.SecretMessage);
modifiedImageData = HeaderUtilities.AddHeader(modifiedImageData, this.OriginalImage.PixelWidth, encrypt,
bitsPerColorChannel,
MessageType.Text);
this.ModifiedImage = new WriteableBitmap(this.OriginalImage.PixelWidth, this.OriginalImage.PixelHeight);
using var writeStream = this.ModifiedImage.PixelBuffer.AsStream();
await writeStream.WriteAsync(modifiedImageData, 0, modifiedImageData.Length);
}
