Init commit

add security encryption and hashing: WIP
add endpoints: register user, get and save resources
add db main operations, User entity

Azaion.Services/Security.cs

@@ -0,0 +1,56 @@
+using System.Security.Cryptography;
+using System.Text;
+
+namespace Azaion.Services;
+
+public static class Security
+{
+    private const int BUFFER_SIZE = 81920; // 80 KB buffer size
+
+    public static string ToHash(this string str) =>
+        Convert.ToBase64String(SHA384.HashData(Encoding.UTF8.GetBytes(str)));
+
+    public static string MakeEncryptionKey(string username, string password) =>
+        $"{username}-{password}---#%@AzaionKey@%#---";
+
+    public static async Task Encrypt(this Stream stream, Stream outputStream, string key, CancellationToken cancellationToken = default)
+    {
+        if (stream is { CanSeek: false }) throw new ArgumentNullException(nameof(stream));
+        if (key is not { Length: > 0 }) throw new ArgumentNullException(nameof(key));
+
+        using var aes = Aes.Create();
+        aes.Key = SHA256.HashData(Encoding.UTF8.GetBytes(key));
+        aes.GenerateIV();
+
+        using var encryptor = aes.CreateEncryptor(aes.Key, aes.IV);
+        await using var cs = new CryptoStream(outputStream, encryptor, CryptoStreamMode.Write);
+
+        // Prepend IV to the encrypted data
+        await outputStream.WriteAsync(aes.IV.AsMemory(0, aes.IV.Length), cancellationToken);
+
+        var buffer = new byte[BUFFER_SIZE];
+        int bytesRead;
+        while ((bytesRead = await stream.ReadAsync(buffer, cancellationToken)) > 0)
+            await cs.WriteAsync(buffer.AsMemory(0, bytesRead), cancellationToken);
+    }
+
+    public static async Task Decrypt(this Stream encryptedStream,  Stream outputStream, string key, CancellationToken cancellationToken = default)
+    {
+        using var aes = Aes.Create();
+        aes.Key = SHA256.HashData(Encoding.UTF8.GetBytes(key));
+
+        // Read the IV from the start of the input stream
+        var iv = new byte[aes.BlockSize / 8];
+        _ = await encryptedStream.ReadAsync(iv, cancellationToken);
+        aes.IV = iv;
+
+        using var decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
+        await using var cryptoStream = new CryptoStream(encryptedStream, decryptor, CryptoStreamMode.Read);
+
+        // Read and write in chunks
+        var buffer = new byte[BUFFER_SIZE];
+        int bytesRead;
+        while ((bytesRead = await cryptoStream.ReadAsync(buffer, cancellationToken)) > 0)
+            await outputStream.WriteAsync(buffer.AsMemory(0, bytesRead), cancellationToken);
+    }
+}