c# - Python 中 C# 的 GetBytes() 等价于什么？

Question

我有

byte[] request = UTF8Encoding.UTF8.GetBytes(requestParams); 

在我正在转换为 Python 的仅 C# AES 加密的类中。谁能告诉我 Python 2.5 的等价物(我在谷歌应用引擎上使用它？

示例输入:

request_params: &r=p&playerid=6263017(或查询字符串的组合)
dev_key: GK1FzK12iPYKE9Kt
dev_iv: E2I21NEwsC9RdSN2
dev_id: 12

Python 函数:

def Encrypt(self, request_params, dev_key, dev_iv, dev_id):

    data_bytes = request_params.encode("utf-8")
    block_size = 16
    mode = AES.MODE_CBC
    assert len(dev_key) == block_size and len(dev_iv) == block_size

    pad_char = '0'
    pad_length = block_size - len(data_bytes) % block_size
    padded_data_bytes = data_bytes + pad_length * pad_char

    encrypted_bytes = dev_iv + AES.new(dev_key, mode, dev_iv).encrypt(padded_data_bytes)
    base64_encrypted_string = base64.urlsafe_b64encode(str(encrypted_bytes))
    request_uri = "http://api.blackoutrugby.com/?d=" + dev_id + "&er=" + base64_encrypted_string
    #http://api.blackoutrugby.com/?d=19&er=RTJJNTFORXdzQzNSZFNObNerdsGhiNoeue6c3mzed4Ty1YE-gTlVJVXHz05uPT-8
    # output from this Python code, it's incorrect
    #http://api.blackoutrugby.com/?d=19&er=16t2waGI2h657pzebN53hPr4kEjOzgsOEZiycDwPXR4=
    # correct output from C# code
    return request_uri

C# 类:

using System;
using System.Security.Cryptography;
using System.Text;
using System.IO;
using System.Net;
using System.Xml;
using Newtonsoft.Json;


namespace BlackoutRugbyPOC.Controllers {
    public class BlackoutRugbyAPI {
        public static string Request(string requestParams, string devKey, string devIV, string devID) {
            // Create an unencrypted request as an array of bytes
            byte[] request = UTF8Encoding.UTF8.GetBytes(requestParams);
            byte[] key = UTF8Encoding.UTF8.GetBytes(devKey);
            byte[] iv = UTF8Encoding.UTF8.GetBytes(devIV);

            AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
            aes.Key = key;
            aes.IV = iv;
            aes.Mode = CipherMode.CBC;
            aes.Padding = PaddingMode.Zeros;

            // Get the transformer from the AES Encryptor
            ICryptoTransform cTransform = aes.CreateEncryptor();

            // Use the transformer to encrypt our request
            byte[] result = cTransform.TransformFinalBlock(request, 0, request.Length);
            aes.Clear();

            // Encode to base64
            string encryptedRequest = Convert.ToBase64String(result, 0, result.Length);

            // Send request to API
            string requestUri = "http://api.blackoutrugby.com/?d=" + devID + "&er=" + encryptedRequest;
            string xmlResponse = getWebResponse(requestUri);
            return XmlToJson(xmlResponse);
        }

        private static string getWebResponse(string url) {
            string html = "";

            WebRequest request = HttpWebRequest.Create(url);
            WebResponse response = request.GetResponse();

            using (StreamReader reader = new StreamReader(response.GetResponseStream())) {
                html = reader.ReadToEnd();
            }
            return html;
        }

        public static string XmlToJson(string xml) {
            if (string.IsNullOrEmpty(xml))
                throw new ArgumentNullException("XML Input");

            XmlDocument doc = new XmlDocument();
            try {
                doc.LoadXml(xml);
            } catch {
                throw new ArgumentNullException("Input could not be loaded into XML Document");
            }

            return JsonConvert.SerializeXmlNode(doc, Newtonsoft.Json.Formatting.Indented);
        }
    }
}

谢谢，
丹尼斯

Answer 1

不知道你从哪里得到以下代码

data_bytes = str.encode(request_params)
key_bytes = str.encode(dev_key)
iv_bytes = str.encode(dev_iv)

但你应该知道它等价于以下内容:

data_bytes = request_params.encode("ascii")
key_bytes = dev_key.encode("ascii")
iv_bytes = dev_iv.encode("ascii")

这意味着三个变量中的任何一个中的非 ASCII 字符都会导致错误(我希望你不要只用 ASCII 字符组成一个 AES key ？)。

在 Python 2.x 中，str 对象(C# 中的 byte[])是字节，unicode 对象(C# 中的 string)是文本。顺便说一下，这个令人困惑的事实在 Python 3.x 中得到了改变。
这意味着如果 request_params 是一个 Unicode 对象，你应该将它编码为 UTF-8，如果它是一个 str 对象，你应该假设(或检查)它已经被编码为 UTF-8。所以它可能是这样的:

if isinstance(request_params, unicode):
    data_bytes = request_params.encode("utf-8")
else:
    request_params.decode("utf-8") # optional check whether it is correct UTF-8
    data_bytes = request_params

至于 key /IV，它们将始终是二进制数据(例如 AES-128 的 16 个字节)，而不是文本。所以他们没有字符编码。删除这两行代码并可能将它们替换为

assert len(dev_key) == block_size and len(dev_iv) == block_size