c# - 无文件的 PGP 加密

Question

我正在对 csv 文件进行 PGP 加密，下面是我遇到问题的代码，基本上，如果公钥位于本地文本文件中，那么下面的代码就可以工作，但是当我在 Azure blob 存储中拥有相同的文件时，我下载内存流中的内容，然后将其作为参数传递，它不起作用，简而言之 File.OpenRead 可以工作，但不能内存流，请帮助

 public static PgpPublicKey ReadPublicKey12()
            {
                var containerName = "pgpkeys";
                string storageConnection = CloudConfigurationManager.GetSetting("StorageConnnection");
                CloudStorageAccount cloudStorageAccount = CloudStorageAccount.Parse(storageConnection);
                CloudBlobClient blobClient = cloudStorageAccount.CreateCloudBlobClient();
                CloudBlobContainer cloudBlobContainer = blobClient.GetContainerReference(containerName);
                CloudBlockBlob blockBlob = cloudBlobContainer.GetBlockBlobReference("keyPublic.txt");
                Stream inputStream = new MemoryStream();           
                blockBlob.DownloadToStream(inputStream);
               //  inputStream = File.OpenRead(@"C:\PGPTest\keyPublic1234.txt"); 
                inputStream = PgpUtilities.GetDecoderStream(inputStream);
                PgpPublicKeyRingBundle pgpPub = new PgpPublicKeyRingBundle(inputStream);

                foreach (PgpPublicKeyRing kRing in pgpPub.GetKeyRings())
                {
                    foreach (PgpPublicKey k in kRing.GetPublicKeys())
                    {
                        if (k.IsEncryptionKey)
                            return k;
                    }
                }

                throw new ArgumentException("Can't find encryption key in key ring.");
            }

Answer 1

如果我们不将流位置重置为零 (inputStream.Position = 0;)，则会将 0 字节 blob 写入内存流，因此您需要添加如下内容。

var containerName = "pgpkeys";
            string storageConnection = CloudConfigurationManager.GetSetting("StorageConnnection");
            CloudStorageAccount cloudStorageAccount = CloudStorageAccount.Parse(storageConnection);
            CloudBlobClient blobClient = cloudStorageAccount.CreateCloudBlobClient();
            CloudBlobContainer cloudBlobContainer = blobClient.GetContainerReference(containerName);
            CloudBlockBlob blockBlob = cloudBlobContainer.GetBlockBlobReference("keyPublic.txt");
            Stream inputStream = new MemoryStream();           
            blockBlob.DownloadToStream(inputStream);
            inputStream.Position = 0;

        inputStream = PgpUtilities.GetDecoderStream(inputStream);
        PgpPublicKeyRingBundle pgpPub = new PgpPublicKeyRingBundle(inputStream);

        foreach (PgpPublicKeyRing kRing in pgpPub.GetKeyRings())
        {
            foreach (PgpPublicKey k in kRing.GetPublicKeys())
            {
                Console.WriteLine("Obtained key from BLOB");
                if (k.IsEncryptionKey)
                    return k;
                Console.WriteLine("Obtained key from BLOB");
            }
        }
        throw new ArgumentException("Can't find encryption key in key ring.");