1 files changed, 49 insertions, 0 deletions
diff --git a/Tools/Hazel-Networking/Hazel/Crypto/DefaultAes.cs b/Tools/Hazel-Networking/Hazel/Crypto/DefaultAes.cs
new file mode 100644
index 0000000..da72fb8
--- /dev/null
+++ b/Tools/Hazel-Networking/Hazel/Crypto/DefaultAes.cs
@@ -0,0 +1,49 @@
+using System;
+using System.Security.Cryptography;
+
+namespace Hazel.Crypto
+{
+    /// <summary>
+    /// AES provider using the default System.Security.Cryptography implementation
+    /// </summary>
+    public class DefaultAes : IAes
+    {
+        private readonly ICryptoTransform encryptor_;
+
+        /// <summary>
+        /// Create a new default instance of the AES block cipher
+        /// </summary>
+        /// <param name="key">Encryption key</param>
+        public DefaultAes(ByteSpan key)
+        {
+            // Create the AES block cipher
+            using (Aes aes = Aes.Create())
+            {
+                aes.KeySize = key.Length * 8;
+                aes.BlockSize = aes.KeySize;
+                aes.Mode = CipherMode.ECB;
+                aes.Padding = PaddingMode.Zeros;
+                aes.Key = key.ToArray();
+
+                this.encryptor_ = aes.CreateEncryptor();
+            }
+        }
+
+        /// <inheritdoc/>
+        public void Dispose()
+        {
+            this.encryptor_.Dispose();
+        }
+
+        /// <inheritdoc/>
+        public int EncryptBlock(ByteSpan inputSpan, ByteSpan outputSpan)
+        {
+            if (inputSpan.Length != outputSpan.Length)
+            {
+                throw new ArgumentException($"ouputSpan length ({outputSpan.Length}) does not match inputSpan length ({inputSpan.Length})", nameof(outputSpan));
+            }
+
+            return this.encryptor_.TransformBlock(inputSpan.GetUnderlyingArray(), inputSpan.Offset, inputSpan.Length, outputSpan.GetUnderlyingArray(), outputSpan.Offset);
+        }
+    }
+}