Exemple #1
0
def hide(input_image_file,
         message,
         generator,
         encoding='UTF-8',
         auto_convert_rgb=False):
    """Hide a message (string) in an image with the
    LSB (Least Significant Bit) technique.
    """
    message_length = len(message)
    assert message_length != 0, "message length is zero"

    img = Image.open(input_image_file)

    if img.mode not in ['RGB', 'RGBA']:
        if not auto_convert_rgb:
            print('The mode of the image is not RGB. Mode is {}'.\
                                                            format(img.mode))
            answer = input('Convert the image to RGB ? [Y / n]\n') or 'Y'
            if answer.lower() == 'n':
                raise Exception('Not a RGB image.')
        img = img.convert('RGB')

    img_list = list(img.getdata())
    width, height = img.size
    index = 0

    message = str(message_length) + ":" + str(message)
    message_bits = "".join(tools.a2bits_list(message, encoding))
    message_bits += '0' * ((3 - (len(message_bits) % 3)) % 3)

    npixels = width * height
    len_message_bits = len(message_bits)
    if len_message_bits > npixels * 3:
        raise Exception("The message you want to hide is too long: {}". \
                                                        format(message_length))

    while index + 3 <= len_message_bits:
        generated_number = next(generator)
        r, g, b, *a = img_list[generated_number]

        # Change the Least Significant Bit of each colour component.
        r = tools.setlsb(r, message_bits[index])
        g = tools.setlsb(g, message_bits[index + 1])
        b = tools.setlsb(b, message_bits[index + 2])

        # Save the new pixel
        if img.mode == 'RGBA':
            img_list[generated_number] = (r, g, b, a[0])
        else:
            img_list[generated_number] = (r, g, b)

        index += 3

    # create empty new image of appropriate format
    encoded = Image.new('RGB', (img.size))

    # insert saved data into the image
    encoded.putdata(img_list)

    return encoded
Exemple #2
0
def hide(input_image: Union[str, IO[bytes]],
        message: str,
        generator: Iterator[int],
        encoding: str = 'UTF-8',
        auto_convert_rgb: bool = False):
    """Hide a message (string) in an image with the
    LSB (Least Significant Bit) technique.
    """
    message_length = len(message)
    assert message_length != 0, "message length is zero"

    img = Image.open(input_image)

    if img.mode not in ['RGB', 'RGBA']:
        if not auto_convert_rgb:
            print('The mode of the image is not RGB. Mode is {}'.\
                                                            format(img.mode))
            answer = input('Convert the image to RGB ? [Y / n]\n') or 'Y'
            if answer.lower() == 'n':
                raise Exception('Not a RGB image.')
        img = img.convert('RGB')

    img_list = list(img.getdata())
    width, height = img.size
    index = 0

    message = str(message_length) + ":" + str(message)
    message_bits = "".join(tools.a2bits_list(message, encoding))
    message_bits += '0' * ((3 - (len(message_bits) % 3)) % 3)

    npixels = width * height
    len_message_bits = len(message_bits)
    if len_message_bits > npixels * 3:
        raise Exception("The message you want to hide is too long: {}". \
                                                        format(message_length))

    while index + 3 <= len_message_bits :
        generated_number = next(generator)
        r, g, b, *a = img_list[generated_number]

        # Change the Least Significant Bit of each colour component.
        r = tools.setlsb(r, message_bits[index])
        g = tools.setlsb(g, message_bits[index+1])
        b = tools.setlsb(b, message_bits[index+2])

        # Save the new pixel
        if img.mode == 'RGBA':
            img_list[generated_number] = (r, g , b, a[0])
        else:
            img_list[generated_number] = (r, g , b)

        index += 3

    # create empty new image of appropriate format
    encoded = Image.new('RGB', (img.size))

    # insert saved data into the image
    encoded.putdata(img_list)

    return encoded
Exemple #3
0
def hide(input_image: Union[str, IO[bytes]],
         message: str,
         encoding: str = 'UTF-8',
         auto_convert_rgb: bool = False):
    """Hide a message (string) in an image with the
    LSB (Least Significant Bit) technique.
    """
    message_length = len(message)
    assert message_length != 0, "message length is zero"

    img = Image.open(input_image)

    if img.mode not in ['RGB', 'RGBA']:
        if not auto_convert_rgb:
            print('The mode of the image is not RGB. Mode is {}'.\
                                                            format(img.mode))
            answer = input('Convert the image to RGB ? [Y / n]\n') or 'Y'
            if answer.lower() == 'n':
                raise Exception('Not a RGB image.')
        img = img.convert('RGB')

    encoded = img.copy()
    width, height = img.size
    index = 0

    message = str(message_length) + ":" + str(message)
    message_bits = "".join(tools.a2bits_list(message, encoding))
    message_bits += '0' * ((3 - (len(message_bits) % 3)) % 3)

    npixels = width * height
    len_message_bits = len(message_bits)
    if len_message_bits > npixels * 3:
        raise Exception("The message you want to hide is too long: {}". \
                                                        format(message_length))
    for row in range(height):
        for col in range(width):
            if index + 3 <= len_message_bits:

                # Get the colour component.
                pixel = img.getpixel((col, row))
                r = pixel[0]
                g = pixel[1]
                b = pixel[2]

                # Change the Least Significant Bit of each colour component.
                r = tools.setlsb(r, message_bits[index])
                g = tools.setlsb(g, message_bits[index + 1])
                b = tools.setlsb(b, message_bits[index + 2])

                # Save the new pixel
                if img.mode == 'RGBA':
                    encoded.putpixel((col, row), (r, g, b, pixel[3]))
                else:
                    encoded.putpixel((col, row), (r, g, b))

                index += 3
            else:
                img.close()
                return encoded
Exemple #4
0
def hide(input_image: Union[str, IO[bytes]],
        message: str,
        encoding: str = 'UTF-8',
        auto_convert_rgb: bool = False):
    """Hide a message (string) in an image with the
    LSB (Least Significant Bit) technique.
    """
    message_length = len(message)
    assert message_length != 0, "message length is zero"

    img = Image.open(input_image)

    if img.mode not in ['RGB', 'RGBA']:
        if not auto_convert_rgb:
            print('The mode of the image is not RGB. Mode is {}'.\
                                                            format(img.mode))
            answer = input('Convert the image to RGB ? [Y / n]\n') or 'Y'
            if answer.lower() == 'n':
                raise Exception('Not a RGB image.')
        img = img.convert('RGB')

    encoded = img.copy()
    width, height = img.size
    index = 0

    message = str(message_length) + ":" + str(message)
    message_bits = "".join(tools.a2bits_list(message, encoding))
    message_bits += '0' * ((3 - (len(message_bits) % 3)) % 3)

    npixels = width * height
    len_message_bits = len(message_bits)
    if len_message_bits > npixels * 3:
        raise Exception("The message you want to hide is too long: {}". \
                                                        format(message_length))
    for row in range(height):
        for col in range(width):
            if index + 3 <= len_message_bits :

                # Get the colour component.
                pixel = img.getpixel((col, row))
                r = pixel[0]
                g = pixel[1]
                b = pixel[2]

                # Change the Least Significant Bit of each colour component.
                r = tools.setlsb(r, message_bits[index])
                g = tools.setlsb(g, message_bits[index+1])
                b = tools.setlsb(b, message_bits[index+2])

                # Save the new pixel
                if img.mode == 'RGBA':
                    encoded.putpixel((col, row), (r, g, b, pixel[3]))
                else:
                    encoded.putpixel((col, row), (r, g, b))

                index += 3
            else:
                img.close()
                return encoded
Exemple #5
0
def hide(input_image_file, message, generator, auto_convert_rgb=False):
    """
    Hide a message (string) in an image with the
    LSB (Least Significant Bit) technique.
    """
    message_length = len(message)
    assert message_length != 0, "message length is zero"

    img = Image.open(input_image_file)
    if img.mode != "RGB":
        print("The mode of the image is not RGB. Mode is {}".format(img.mode))
        if not auto_convert_rgb:
            answer = input("Convert the image to RGB ? [Y / n]\n") or "Y"
            if answer.lower() == "n":
                raise Exception("Not a RGB image.")

        img = img.convert("RGB")

    img_list = list(img.getdata())
    width, height = img.size
    index = 0

    message = str(len(message)) + ":" + str(message)
    # message_bits = tools.a2bits(message)
    message_bits = "".join(tools.a2bits_list(message))
    message_bits += "0" * ((3 - (len(message_bits) % 3)) % 3)

    npixels = width * height
    len_message_bits = len(message_bits)
    if len_message_bits > npixels * 3:
        raise Exception("The message you want to hide is too long: {}".format(message_length))

    while index + 3 <= len_message_bits:
        generated_number = next(generator)
        (r, g, b) = img_list[generated_number]

        # Change the Least Significant Bit of each colour component.
        r = tools.setlsb(r, message_bits[index])
        g = tools.setlsb(g, message_bits[index + 1])
        b = tools.setlsb(b, message_bits[index + 2])

        # Save the new pixel
        img_list[generated_number] = (r, g, b)

        index += 3

    # create empty new image of appropriate format
    encoded = Image.new("RGB", (img.size))

    # insert saved data into the image
    encoded.putdata(img_list)

    return encoded
def hide(
    input_image: Union[str, IO[bytes]],
    message: str,
    generator: Iterator[int],
    shift: int = 0,
    encoding: str = "UTF-8",
    auto_convert_rgb: bool = False,
):
    """Hide a message (string) in an image with the
    LSB (Least Significant Bit) technique.
    """
    message_length = len(message)
    assert message_length != 0, "message length is zero"

    img = tools.open_image(input_image)

    if img.mode not in ["RGB", "RGBA"]:
        if not auto_convert_rgb:
            print("The mode of the image is not RGB. Mode is {}".format(
                img.mode))
            answer = input("Convert the image to RGB ? [Y / n]\n") or "Y"
            if answer.lower() == "n":
                raise Exception("Not a RGB image.")
        img = img.convert("RGB")

    img_list = list(img.getdata())
    width, height = img.size
    index = 0

    message = str(message_length) + ":" + str(message)
    message_bits = "".join(tools.a2bits_list(message, encoding))
    message_bits += "0" * ((3 - (len(message_bits) % 3)) % 3)

    npixels = width * height
    len_message_bits = len(message_bits)
    if len_message_bits > npixels * 3:
        raise Exception("The message you want to hide is too long: {}".format(
            message_length))
    while shift != 0:
        next(generator)
        shift -= 1

    while index + 3 <= len_message_bits:
        generated_number = next(generator)
        r, g, b, *a = img_list[generated_number]

        # Change the Least Significant Bit of each colour component.
        r = tools.setlsb(r, message_bits[index])
        g = tools.setlsb(g, message_bits[index + 1])
        b = tools.setlsb(b, message_bits[index + 2])

        # Save the new pixel
        if img.mode == "RGBA":
            img_list[generated_number] = (r, g, b, *a)
        else:
            img_list[generated_number] = (r, g, b)

        index += 3

    # create empty new image of appropriate format
    encoded = Image.new(img.mode, (img.size))

    # insert saved data into the image
    encoded.putdata(img_list)

    return encoded