diff --git a/src/crypto.zig b/src/crypto.zig
new file mode 100644
index 0000000..c1500fd
--- /dev/null
+++ b/src/crypto.zig
@@ -0,0 +1,36 @@
+// WARNING NOT FUNCTIONAL !!!
+// This is just a draft
+// TODO
+
+///////////////// Imports
+//
+
+const AES = @import("crypto/aes.zig");
+
+
+///////////////// Public functions
+//
+
+pub fn CryptoEngine(comptime Provider: anytype) type {
+    return struct {
+        const Self = @This();
+
+        pub const Aes = AES.AesEngine(Provider);
+    };
+}
+
+
+///////////////// Tests
+//
+
+const std = @import("std");
+
+test "AES encryption defaults" {
+    
+    const crypto = CryptoEngine();
+
+    var data = [_]u8{ 1, 2, 3, 4 };
+    const key = [_]u8{ 1, 2, 3, 4 };
+    const iv = [_]u8{ 1, 2, 3, 4 };
+    crypto.Aes.CBC_265.encrypt(&data, &key, &iv);
+}
diff --git a/src/crypto/aes.zig b/src/crypto/aes.zig
new file mode 100644
index 0000000..4facf45
--- /dev/null
+++ b/src/crypto/aes.zig
@@ -0,0 +1,41 @@
+// WARNING NOT FUNCTIONAL !!!
+// This is just a draft
+// TODO
+
+pub const DefaultEngine = struct {
+    pub fn encrypt(data: []u8) void {
+        _ = data;
+    }
+};
+
+pub fn AesEngine(comptime Provider: anytype) type {
+
+    _ = Provider;
+
+    return struct {
+        const Self = @This();
+
+        pub const CBC_265 = struct {
+            const key_length = 256;
+
+            // Encrypts the data block using AES 256 CBC
+            pub fn encrypt(data: []u8, key: [key_length]u8, iv: []u8) void {
+                _ = data;
+                _ = key;
+                _ = iv;
+            }
+        };
+
+        pub const CBC_128 = struct {
+            const key_length = 128;
+
+            // Encrypts the data block using AES 128 CBC
+            pub fn encrypt(data: []u8, key: [key_length]u8, iv: []u8) void {
+                _ = data;
+                _ = key;
+                _ = iv;
+            }
+        };
+
+    };
+}
diff --git a/src/crypto/ed25519.zig b/src/crypto/ed25519.zig
new file mode 100644
index 0000000..e69de29
diff --git a/src/crypto/hkdf.zig b/src/crypto/hkdf.zig
new file mode 100644
index 0000000..e69de29
diff --git a/src/crypto/hmac.zig b/src/crypto/hmac.zig
new file mode 100644
index 0000000..e69de29
diff --git a/src/crypto/sha256.zig b/src/crypto/sha256.zig
new file mode 100644
index 0000000..e69de29
diff --git a/src/crypto/sha512.zig b/src/crypto/sha512.zig
new file mode 100644
index 0000000..e69de29
diff --git a/src/crypto/x25519.zig b/src/crypto/x25519.zig
new file mode 100644
index 0000000..e69de29
diff --git a/src/root.zig b/src/root.zig
index 9b202f1..95a57a1 100644
--- a/src/root.zig
+++ b/src/root.zig
@@ -1 +1,2 @@
 pub const packet = @import("packet.zig");
+// pub const crypto = @import("crypto.zig");