feat(infrastructure): implement RsaKeyService with tests

2026-01-03 08:16:13 -05:00
parent 4e1523b0c0
commit 97ef3e4345
2 changed files with 146 additions and 0 deletions
@@ -0,0 +1,50 @@
+// NEW/src/JdeScoping.Infrastructure/Security/RsaKeyService.cs
+using System.Security.Cryptography;
+using JdeScoping.Core.Interfaces;
+
+namespace JdeScoping.Infrastructure.Security;
+
+/// <summary>
+/// RSA key service that auto-generates and persists keys.
+/// </summary>
+public class RsaKeyService : IRsaKeyService, IDisposable
+{
+    private readonly RSA _rsa;
+
+    /// <summary>
+    /// Creates a new RSA key service.
+    /// </summary>
+    /// <param name="keyFilePath">Path to persist the private key</param>
+    public RsaKeyService(string keyFilePath)
+    {
+        _rsa = RSA.Create(2048);
+
+        if (File.Exists(keyFilePath))
+        {
+            var keyBytes = File.ReadAllBytes(keyFilePath);
+            _rsa.ImportRSAPrivateKey(keyBytes, out _);
+        }
+        else
+        {
+            var privateKey = _rsa.ExportRSAPrivateKey();
+            var directory = Path.GetDirectoryName(keyFilePath);
+            if (!string.IsNullOrEmpty(directory))
+                Directory.CreateDirectory(directory);
+            File.WriteAllBytes(keyFilePath, privateKey);
+        }
+    }
+
+    /// <inheritdoc />
+    public string GetPublicKeyPem()
+        => _rsa.ExportSubjectPublicKeyInfoPem();
+
+    /// <inheritdoc />
+    public byte[] Decrypt(byte[] ciphertext)
+        => _rsa.Decrypt(ciphertext, RSAEncryptionPadding.OaepSHA256);
+
+    public void Dispose()
+    {
+        _rsa.Dispose();
+        GC.SuppressFinalize(this);
+    }
+}