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Samples for core whats new 3.0 (#834)
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‎core/whats-new/whats-new-in-30/cs/Cipher.cs‎

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// <SnippetAesGcm>
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using System;
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using System.Linq;
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using System.Security.Cryptography;
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namespace whats_new
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{
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public static class Cipher
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{
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public static void Run()
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{
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// key should be: pre-known, derived, or transported via another channel, such as RSA encryption
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byte[] key = new byte[16];
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RandomNumberGenerator.Fill(key);
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byte[] nonce = new byte[12];
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RandomNumberGenerator.Fill(nonce);
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// normally this would be your data
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byte[] dataToEncrypt = new byte[1234];
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byte[] associatedData = new byte[333];
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RandomNumberGenerator.Fill(dataToEncrypt);
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RandomNumberGenerator.Fill(associatedData);
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// these will be filled during the encryption
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byte[] tag = new byte[16];
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byte[] ciphertext = new byte[dataToEncrypt.Length];
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using (AesGcm aesGcm = new AesGcm(key))
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{
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aesGcm.Encrypt(nonce, dataToEncrypt, ciphertext, tag, associatedData);
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}
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// tag, nonce, ciphertext, associatedData should be sent to the other part
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byte[] decryptedData = new byte[ciphertext.Length];
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using (AesGcm aesGcm = new AesGcm(key))
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{
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aesGcm.Decrypt(nonce, ciphertext, tag, decryptedData, associatedData);
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}
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// do something with the data
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// this should always print that data is the same
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Console.WriteLine($"AES-GCM: Decrypted data is {(dataToEncrypt.SequenceEqual(decryptedData) ? "the same as" : "different than")} original data.");
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}
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}
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}
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// </SnippetAesGcm>

‎core/whats-new/whats-new-in-30/cs/Program.cs‎

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using System;
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using System.IO;
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using System.Text.Json;
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using System.Threading.Tasks;
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namespace whats_new
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{
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class Program
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{
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static async Task Main(string[] args)
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{
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// <SnippetPrintJsonCall>
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// Calling code
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Console.WriteLine("Read with Utf8JsonReader");
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PrintJson(File.ReadAllBytes("launch.json").AsSpan());
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// </SnippetPrintJsonCall>
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// <SnippetReadJsonCall>
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// Calling code
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Console.WriteLine("Read with JsonDocument");
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ReadJson(File.ReadAllText("launch.json"));
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// </SnippetReadJsonCall>
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//await TLS.ConnectCloudFlare();
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//Cipher.Run();
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}
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// <SnippetPrintJson>
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public static void PrintJson(ReadOnlySpan<byte> dataUtf8)
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{
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var json = new Utf8JsonReader(dataUtf8, isFinalBlock: true, state: default);
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while (json.Read())
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{
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JsonTokenType tokenType = json.TokenType;
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ReadOnlySpan<byte> valueSpan = json.ValueSpan;
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switch (tokenType)
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{
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case JsonTokenType.StartObject:
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case JsonTokenType.EndObject:
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break;
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case JsonTokenType.StartArray:
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case JsonTokenType.EndArray:
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break;
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case JsonTokenType.PropertyName:
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break;
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case JsonTokenType.String:
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Console.WriteLine($"STRING: {json.GetString()}");
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break;
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case JsonTokenType.Number:
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if (!json.TryGetInt32(out int valueInteger))
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{
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throw new FormatException();
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}
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break;
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case JsonTokenType.True:
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case JsonTokenType.False:
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Console.WriteLine($"BOOL: {json.GetBoolean()}");
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break;
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case JsonTokenType.Null:
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break;
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default:
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throw new ArgumentException();
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}
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}
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dataUtf8 = dataUtf8.Slice((int)json.BytesConsumed);
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JsonReaderState state = json.CurrentState;
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}
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// </SnippetPrintJson>
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// <SnippetReadJson>
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public static void ReadJson(string jsonString)
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{
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using var document = JsonDocument.Parse(jsonString);
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var root = document.RootElement;
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var version = root.GetProperty("version").GetString();
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var configurations = root.GetProperty("configurations");
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Console.WriteLine($"Launch Version: {version}");
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foreach (var config in configurations.EnumerateArray())
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{
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var name = config.GetProperty("name").GetString();
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Console.WriteLine($"Config: {name}");
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}
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}
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// </SnippetReadJson>
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}
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}

‎core/whats-new/whats-new-in-30/cs/RSA.cs‎

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// <SnippetRsa>
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using System;
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using System.Security.Cryptography;
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namespace whats_new
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{
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public static class RSATest
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{
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public static void Run(string keyFile)
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{
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using var rsa = RSA.Create();
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byte[] keyBytes = System.IO.File.ReadAllBytes(keyFile);
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rsa.ImportRSAPrivateKey(keyBytes, out int bytesRead);
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Console.WriteLine($"Read {bytesRead} bytes, {keyBytes.Length - bytesRead} extra byte(s) in file.");
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RSAParameters rsaParameters = rsa.ExportParameters(true);
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Console.WriteLine(BitConverter.ToString(rsaParameters.D));
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}
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}
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}
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// </SnippetRsa>

‎core/whats-new/whats-new-in-30/cs/TLS.cs‎

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// <SnippetTLS>
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using System;
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using System.Net.Security;
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using System.Net.Sockets;
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using System.Threading.Tasks;
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namespace whats_new
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{
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public static class TLS
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{
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public static async Task ConnectCloudFlare()
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{
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var targetHost = "www.cloudflare.com";
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using TcpClient tcpClient = new TcpClient();
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await tcpClient.ConnectAsync(targetHost, 443);
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using SslStream sslStream = new SslStream(tcpClient.GetStream());
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await sslStream.AuthenticateAsClientAsync(targetHost);
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await Console.Out.WriteLineAsync($"Connected to {targetHost} with {sslStream.SslProtocol}");
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}
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}
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}
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// </SnippetTLS>

‎core/whats-new/whats-new-in-30/cs/launch.json‎

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{
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"version": "0.2.0",
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"configurations": [
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{
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"name": ".NET Core Launch (console)",
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"type": "coreclr",
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"request": "launch",
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"preLaunchTask": "build",
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"program": "${workspaceFolder}/bin/Debug/netcoreapp3.0/whats-new.dll",
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"args": [],
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"cwd": "${workspaceFolder}",
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"console": "internalConsole",
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"stopAtEntry": false,
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"internalConsoleOptions": "openOnSessionStart"
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},
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{
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"name": ".NET Core Attach",
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"type": "coreclr",
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"request": "attach",
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"processId": "${command:pickProcess}"
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}
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]
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}

‎core/whats-new/whats-new-in-30/cs/whats-new.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>netcoreapp3.0</TargetFramework>
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<RootNamespace>whats_new</RootNamespace>
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<LangVersion>8.0</LangVersion>
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</PropertyGroup>
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<ItemGroup>
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<None Update="launch.json">
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<CopyToOutputDirectory>Always</CopyToOutputDirectory>
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</None>
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</ItemGroup>
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</Project>

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