Encrypt String in .NET Core

Question

I would like to encrypt a string in .NET Core using a key. I have a client / server scenario and would like to encrypt a string on the client, send it to the server and decr

Answer 1

Here is a trivial sample without authentication:

var text = "Hello World";
var buffer = Encoding.UTF8.GetBytes(text);

var iv = GetRandomData(128);
var keyAes = GetRandomData(256);


byte[] result;
using (var aes = Aes.Create())
{
    aes.Key = keyAes;
    aes.IV = iv;

    using (var encryptor = aes.CreateEncryptor(aes.Key, aes.IV))
    using (var resultStream = new MemoryStream())
    {
        using (var aesStream = new CryptoStream(resultStream, encryptor, CryptoStreamMode.Write))
        using (var plainStream = new MemoryStream(buffer))
        {
            plainStream.CopyTo(aesStream);
        }

        result = resultStream.ToArray();
    }
}

For key generation:

private static byte[] GetRandomData(int bits)
{
    var result = new byte[bits / 8];
    RandomNumberGenerator.Create().GetBytes(result);
    return result;
}