为这段代码注释from PIL import Image import hashlib import requests import json import certifi import os image_url = "xxxxxxxx" response = requests.get(image_url) if response.status_code == 200: image_path = 'original_image.jpg' with open(image_path, 'wb') as f: f.write(response.content) owner_info = "XXXXXXX" else: raise Exception("Unable to download image") blockchain_api_url = "XXXXXXXXXXXXXXXXXXX" payload = {"text": owner_info} response = requests.post(blockchain_api_url, data=json.dumps(payload)) if response.status_code == 200: encrypted_data = response.json()["data"] else: raise Exception("Unable to encrypt data using blockchain API") response = requests.get(blockchain_api_url + f"/{encrypted_data}") if response.status_code == 200: decrypted_data = response.json()["text"] else: raise Exception("Unable to decrypt data using blockchain API") def encrypt_image(image_path, key): img = Image.open(image_path).convert('RGB') pixels = img.load() width, height = img.size key = hashlib.sha256(key.encode()).digest() key_parts = [key[i:i+3] for i in range(0, len(key), 3)] for x in range(width): for y in range(height): r, g, b = pixels[x, y] r = r ^ key_parts[x % len(key_parts)][0] g = g ^ key_parts[y % len(key_parts)][1] b = b ^ key_parts[(x+y) % len(key_parts)][2] pixels[x, y] = (r, g, b) img.save(image_path.replace('.jpg', '_encrypted.jpg')) os.environ['REQUESTS_CA_BUNDLE'] = certifi.where() encrypt_image(image_path, decrypted_data)

这段代码主要是通过调用requests库下载一张图片，然后使用PIL库对图片进行加密，最后将加密后的图片保存在本地。同时，还使用了一个区块链API对一个文本信息进行加密和解密。

具体注释如下：

from PIL import Image  # 导入PIL库，用于图片加密
import hashlib  # 导入hashlib库，用于生成加密密钥
import requests  # 导入requests库，用于下载图片和调用区块链API
import json  # 导入json库，用于将数据转换为JSON格式
import certifi  # 导入certifi库，用于SSL证书验证
import os  # 导入os库，用于操作系统相关的操作

# 定义要下载的图片的URL
image_url = "xxxxxxxx"

# 发送GET请求下载图片
response = requests.get(image_url)

# 判断请求是否成功
if response.status_code == 200:
    # 如果请求成功，将图片保存到本地
    image_path = 'original_image.jpg'
    with open(image_path, 'wb') as f:
        f.write(response.content)
    # 定义一个文本信息
    owner_info = "XXXXXXX"
else:
    # 如果请求失败，抛出异常
    raise Exception("Unable to download image")

# 定义区块链API的URL
blockchain_api_url = "XXXXXXXXXXXXXXXXXXX"

# 调用区块链API对文本信息进行加密
payload = {"text": owner_info}
response = requests.post(blockchain_api_url, data=json.dumps(payload))
if response.status_code == 200:
    # 如果加密成功，获取加密后的数据
    encrypted_data = response.json()["data"]
else:
    # 如果加密失败，抛出异常
    raise Exception("Unable to encrypt data using blockchain API")

# 调用区块链API对加密后的数据进行解密
response = requests.get(blockchain_api_url + f"/{encrypted_data}")
if response.status_code == 200:
    # 如果解密成功，获取解密后的文本信息
    decrypted_data = response.json()["text"]
else:
    # 如果解密失败，抛出异常
    raise Exception("Unable to decrypt data using blockchain API")

# 定义图片加密函数
def encrypt_image(image_path, key):
    # 打开图片并转换为RGB模式
    img = Image.open(image_path).convert('RGB')
    pixels = img.load()  # 获取像素数据
    width, height = img.size  # 获取图片的宽和高
    # 对密钥进行哈希加密，生成加密密钥
    key = hashlib.sha256(key.encode()).digest()
    # 将加密密钥分成多个部分
    key_parts = [key[i:i+3] for i in range(0, len(key), 3)]
    # 遍历每个像素点，并执行异或运算
    for x in range(width):
        for y in range(height):
            r, g, b = pixels[x, y]  # 获取像素点的RGB值
            r = r ^ key_parts[x % len(key_parts)][0]
            g = g ^ key_parts[y % len(key_parts)][1]
            b = b ^ key_parts[(x+y) % len(key_parts)][2]
            pixels[x, y] = (r, g, b)  # 更新像素点的RGB值
    img.save(image_path.replace('.jpg', '_encrypted.jpg'))  # 保存加密后的图片

os.environ['REQUESTS_CA_BUNDLE'] = certifi.where()  # 设置SSL证书验证环境变量
encrypt_image(image_path, decrypted_data)  # 对图片进行加密