用python写一个解密提取盲水印sm3算法加密注入盲水印的图片的代码

我可以回答这个问题。以下是用Python编写解密提取盲水印SM3算法加密注入盲水印的图片的代码：

import hashlib
from PIL import Image

def extract_watermark(image_path, watermark_length):
    # Open the image and get the pixel data
    image = Image.open(image_path)
    pixels = list(image.getdata())

    # Extract the watermark from the image
    watermark = []
    for i in range(watermark_length):
        pixel = pixels[i]
        r, g, b = pixel[0], pixel[1], pixel[2]
        watermark_byte = (r & 0x03) << 6 | (g & 0x03) << 4 | (b & 0x03) << 2
        watermark.append(watermark_byte)

    # Hash the watermark to verify its integrity
    hash = hashlib.new('sm3')
    hash.update(bytes(watermark))
    if hash.digest() != pixels[watermark_length]:
        raise Exception('Watermark hash does not match')

    return watermark

def embed_watermark(image_path, watermark, output_path):
    # Open the image and get the pixel data
    image = Image.open(image_path)
    pixels = list(image.getdata())

    # Embed the watermark in the image
    for i in range(len(watermark)):
        watermark_byte = watermark[i]
        pixel = pixels[i]
        r, g, b = pixel[0], pixel[1], pixel[2]
        r = (r & 0xFC) | ((watermark_byte >> 6) & 0x03)
        g = (g & 0xFC) | ((watermark_byte >> 4) & 0x03)
        b = (b & 0xFC) | ((watermark_byte >> 2) & 0x03)
        pixels[i] = (r, g, b)

    # Hash the watermark and embed it in the image
    hash = hashlib.new('sm3')
    hash.update(bytes(watermark))
    pixels.append(hash.digest())

    # Save the watermarked image
    watermarked_image = Image.new(image.mode, image.size)
    watermarked_image.putdata(pixels)
    watermarked_image.save(output_path)

这个代码可以用来提取和嵌入盲水印SM3算法加密注入的图片。提取水印需要提供图片路径和水印长度，而嵌入水印需要提供图片路径、水印和输出路径。