azure-storage-encryption-test.cs

void Main()
{
	var storage = Microsoft.WindowsAzure.Storage.CloudStorageAccount.Parse("DefaultEndpointsProtocol=https;AccountName=en7343;AccountKey=VdJRm1PbyQ8YOrd3gR+CMcS5YQge6H4XMMaNpR2DBhDxV/0A/lQT+SXnNnQbx0xqyLTQVnY5+DwwEYCXWqFm3g==;EndpointSuffix=core.windows.net");
	var client = storage.CreateCloudBlobClient();
	
	var container = client.GetContainerReference("test-06");
	container.CreateIfNotExists();

	CreateData(container);
	ReadData(container);

	//-- Encrypt --//
	
	ReadData(container);
	CreateEncryptedData(container);
	AppendData1(container);
	ReadAppendedData(container);

	// -- Decrypt --//
	ReadAppendedData(container);
	AppendData2(container);
	ReadFinalData(container);
}

// Define other methods and classes here
public void CreateData(CloudBlobContainer container)
{
	var textBlob = container.GetBlockBlobReference("readme.txt");
	if (!textBlob.Exists())
	{
		textBlob.UploadText("README.TXT");
	}

	var appendBlob = container.GetAppendBlobReference("append.bin");
	if (!appendBlob.Exists())
	{
		appendBlob.CreateOrReplace();
		
		var block = Enumerable.Range(0, 1024).Select(i => (byte)i).ToArray();
		appendBlob.AppendBlock(new MemoryStream(block));
	}
}

public void ReadData(CloudBlobContainer container)
{
	var textBlob = container.GetBlockBlobReference("readme.txt");
	if (textBlob.Exists())
	{
		var text = textBlob.DownloadText();
		Console.WriteLine($"{text} => README.TXT {text == "README.TXT"}");		
	}

	var appendBlob = container.GetAppendBlobReference("append.bin");
	if (appendBlob.Exists())
	{
		var ms = new MemoryStream();
		appendBlob.DownloadToStream(ms);
		var content = ms.ToArray();
		
		Console.WriteLine($"{string.Join(" ", content.Select(b => b.ToString("d2")).Take(4))} => 00 01 02 03 {content.SequenceEqual(Enumerable.Range(0, 1024).Select(i => (byte)i))}");
	}
}

public void AppendData1(CloudBlobContainer container)
{
	var appendBlob = container.GetAppendBlobReference("append.bin");
	var block = Enumerable.Range(0, 256).Select(i => new byte[] { 0xDe, 0xad, 0xBe, 0xef }).SelectMany(b => b).ToArray();
	appendBlob.AppendBlock(new MemoryStream(block));
}

// Define other methods and classes here
public void CreateEncryptedData(CloudBlobContainer container)
{
	var textBlob = container.GetBlockBlobReference("encrypted-readme.txt");
	if (!textBlob.Exists())
	{
		textBlob.UploadText("README.TXT");
	}

	var appendBlob = container.GetAppendBlobReference("encrypted-append.bin");
	if (!appendBlob.Exists())
	{
		appendBlob.CreateOrReplace();

		var block = Enumerable.Range(0, 1024).Select(i => (byte)i).ToArray();
		appendBlob.AppendBlock(new MemoryStream(block));
	}
}

public void ReadAppendedData(CloudBlobContainer container)
{
	var appendBlob = container.GetAppendBlobReference("append.bin");

	var ms = new MemoryStream();
	appendBlob.DownloadToStream(ms);
	var content = ms.ToArray();

	var pattern = Enumerable.Range(0, 1024).Select(i => (byte)i)
		.Concat(Enumerable.Range(0, 256).Select(i => new byte[] { 0xDe, 0xad, 0xBe, 0xef }).SelectMany(b => b));
	Console.WriteLine($"{string.Join(" ", content.Skip(1024).Select(b => b.ToString("X2")).Take(4))} => DE AD BE EF {content.SequenceEqual(pattern)}");

	var encryptedTextBlob = container.GetBlockBlobReference("encrypted-readme.txt");
	var text = encryptedTextBlob.DownloadText();
	Console.WriteLine($"{text} => README.TXT {text == "README.TXT"}");

	var encryptedAppendBlob = container.GetAppendBlobReference("encrypted-append.bin");
	var ms2 = new MemoryStream();
	encryptedAppendBlob.DownloadToStream(ms2);
	var content2 = ms2.ToArray();

	pattern = Enumerable.Range(0, 1024).Select(i => (byte)i);
	Console.WriteLine($"{string.Join(" ", content2.Select(b => b.ToString("X2")).Take(4))} => 00 01 02 03 {content2.SequenceEqual(pattern)}");
}

public void AppendData2(CloudBlobContainer container)
{
	var appendBlob = container.GetAppendBlobReference("append.bin");
	var block = Enumerable.Range(0, 256).Select(i => new byte[] { 0xB1, 0x6B, 0x00, 0xB5 }).SelectMany(b => b).ToArray();
	appendBlob.AppendBlock(new MemoryStream(block));
}

public void ReadFinalData(CloudBlobContainer container)
{
	var appendBlob = container.GetAppendBlobReference("append.bin");

	var ms = new MemoryStream();
	appendBlob.DownloadToStream(ms);
	var content = ms.ToArray();

	var pattern = Enumerable.Range(0, 1024).Select(i => (byte)i)
		.Concat(Enumerable.Range(0, 256).Select(i => new byte[] { 0xDe, 0xad, 0xBe, 0xef }).SelectMany(b => b))
		.Concat(Enumerable.Range(0, 256).Select(i => new byte[] { 0xB1, 0x6B, 0x00, 0xB5 }).SelectMany(b => b))
		;
	Console.WriteLine($"{string.Join(" ", content.Skip(2048).Select(b => b.ToString("X2")).Take(4))} => DE AD BE EF {content.SequenceEqual(pattern)}");

	var encryptedTextBlob = container.GetBlockBlobReference("encrypted-readme.txt");
	var text = encryptedTextBlob.DownloadText();
	Console.WriteLine($"{text} => README.TXT {text == "README.TXT"}");

	var encryptedAppendBlob = container.GetAppendBlobReference("encrypted-append.bin");
	var ms2 = new MemoryStream();
	encryptedAppendBlob.DownloadToStream(ms2);
	var content2 = ms2.ToArray();

	pattern = Enumerable.Range(0, 1024).Select(i => (byte)i);
	Console.WriteLine($"{string.Join(" ", content2.Select(b => b.ToString("X2")).Take(4))} => 00 01 02 03 {content2.SequenceEqual(pattern)}");
}