如何从亚马逊销售合作伙伴 api 解密亚马逊报告文件答案

【问题标题】：How to decrypt the amazon report-document from amazon selling partner api如何从亚马逊销售合作伙伴 api 解密亚马逊报告文件
【发布时间】：2021-05-26 18:13:55
【问题描述】：

报告文档API 获取报告文档接口

"response": {
              "payload": {
                "reportDocumentId": "0356cf79-b8b0-4226-b4b9-0ee058ea5760",
                "url": "https://d34o8swod1owfl.cloudfront.net/SampleResult%2BKey%3DSample%2BINITVEC%3D58+fa+bf+a7+08+11+95+0f+c1+a8+c6+e0+d5+6f+ae+c8",
                "encryptionDetails": {
                  "standard": "AES",
                  "initializationVector": "58 fa bf a7 08 11 95 0f c1 a8 c6 e0 d5 6f ae c8",
                  "key": "Sample"
                }
              }
            }

当我直接访问这个 URL "url": "https://d34o8swod1owfl.cloudfront.net/SampleResult%2BKey%3DSample%2BINITVEC%3D58+fa+bf+a7+08+11+95+0f+c1+a8+c6+e0+d5+6f+ae+c8"，自动下载文件，我应该用AES解密文件吗？初始化向量是用Base64编码的吗？如何获取报告？

【问题讨论】：

标签： c# amazon amazonsellercentral

【解决方案1】：

通过 url 下载文件后（你只有 5 分钟的时间），你必须解密它。因此，按字节（二进制）下载它并使用密码模式 CBC 使用 AES（最初称为 Rijndael）对其进行解密。如您所想，密钥和初始化向量是 base 64 编码的。她是 C# 中的一些示例代码：

GetReportDocumentResponse requestResult = ... //your request to getreportdocument here
byte[] rawData = new System.Net.WebClient().DownloadData(requestResult.payload.url);
byte[] key = Convert.FromBase64String(requestResult.payload.encryptionDetails.key);
byte[] iv = Convert.FromBase64String(requestResult.payload.encryptionDetails.initializationVector);

string documentText; // this will contain the decrypted document
using (var rijndaelManaged = new RijndaelManaged { Key = key, IV = iv, Mode = CipherMode.CBC })
using (var memoryStream = new MemoryStream(rawData))
using (var cryptoStream = new CryptoStream(memoryStream, rijndaelManaged.CreateDecryptor(key, iv), CryptoStreamMode.Read))
{
    documentText = new StreamReader(cryptoStream).ReadToEnd();
}

【讨论】：

【解决方案2】：

//这是我的工作代码
++++++++++++++++++++++++++++++

response3 = reportsApi.GetReportDocument("Give_your_ReportDocumentId");
            
byte[] rawData = new System.Net.WebClient().DownloadData(response3.Payload.Url);
byte[] key = Convert.FromBase64String(response3.Payload.EncryptionDetails.Key);
byte[] iv = Convert.FromBase64String(response3.Payload.EncryptionDetails.InitializationVector);

var reportData = ReportsApiTests.DecryptString(key, iv, rawData);
File.WriteAllText(report_type + ".txt", reportData);


public static string DecryptString(byte[] key, byte[] iv, byte[] cipherText)
{
    byte[] buffer = cipherText;

    using (Aes aes = Aes.Create())
    {
        aes.Key = key;
        aes.IV = iv;
        ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);

        using (MemoryStream memoryStream = new MemoryStream(buffer))
        {
            using (CryptoStream cryptoStream = new CryptoStream((Stream)memoryStream, decryptor, CryptoStreamMode.Read))
            {
                using (StreamReader streamReader = new StreamReader((Stream)cryptoStream))
                {
                    return streamReader.ReadToEnd();
                }
            }
        }
    }
    
}

【讨论】：