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  • Book Overview & Buying C# 6 and .NET Core 1.0
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C# 6 and .NET Core 1.0

C# 6 and .NET Core 1.0

3.8 (11)
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C# 6 and .NET Core 1.0

C# 6 and .NET Core 1.0

3.8 (11)

Overview of this book

With the release of .NET Core 1.0, you can now create applications for Mac OS X and Linux, as well as Windows, using the development tools you know and love. C# 6 and .NET Core 1.0 has been divided into three high-impact sections to help start putting these new features to work. First, we'll run you through the basics of C#, as well as object-orient programming, before taking a quick tour through the latest features of C# 6 such as string interpolation for easier variable value output, exception filtering, and how to perform static class imports. We'll also cover both the full-feature, mature .NET Framework and the new, cross-platform .NET Core. After quickly taking you through C# and how .NET works, we'll dive into the internals of the .NET class libraries, covering topics such as performance, monitoring, debugging, internationalization, serialization, and encryption. We'll look at Entity Framework Core 1.0 and how to develop Code-First entity data models, as well as how to use LINQ to query and manipulate that data. The final section will demonstrate the major types of applications that you can build and deploy cross-device and cross-platform. In this section, we'll cover Universal Windows Platform (UWP) apps, web applications, and web services. Lastly, we'll help you build a complete application that can be hosted on all of today's most popular platforms, including Linux and Docker. By the end of the book, you'll be armed with all the knowledge you need to build modern, cross-platform applications using C# and .NET Core.
Table of Contents (20 chapters)
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19
Index

Signing data

To prove that some data has come from someone we trust, it can be signed. Actually, you don't sign the data itself, instead you sign a hash of the data. We will use the RSA algorithm combined with the SHA256 algorithm.

Signing with SHA256 and RSA

In the Ch11_Cryptography class library project, add the following code to the Protector class:

public static string PublicKey;

public static string GenerateSignature(string data)
{
    byte[] dataBytes = Encoding.Unicode.GetBytes(data);
    var sha = SHA256.Create();
    var hashedData = sha.ComputeHash(dataBytes);

    var rsa = RSA.Create();
    PublicKey = rsa.ToXmlString(false); // exclude private key

    var signer = new RSAPKCS1SignatureFormatter(rsa);
    signer.SetHashAlgorithm("SHA256");

    return Convert.ToBase64String(signer.CreateSignature(hashedData));
}

public static bool ValidateSignature(string data, string signature)
{
    byte[] dataBytes = Encoding.Unicode.GetBytes(data);
    var sha = SHA256.Create...

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