diff --git a/src/main.zig b/src/main.zig
index 79969c6..f943360 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -36,15 +36,25 @@ const Peer = struct {
         return self;
     }
 
-    pub fn encrypt(ally: std.mem.Allocator, msg: []const u8) !Packet {
+    /// Caller must free result
+    pub fn encrypt(self: Self, ally: std.mem.Allocator, msg: []const u8) !Packet {
         var pkt: Packet = undefined;
         std.crypto.random.bytes(&pkt.nonce);
+        pkt.cipher_text = try ally.alloc(u8, msg.len);
+        AES.encrypt(pkt.cipher_text, &pkt.tag, msg, "", pkt.nonce, self.shared_key);
+        return pkt;
+    }
+
+    /// Caller must free result
+    pub fn decrypt(self: Self, ally: std.mem.Allocator, msg: []const u8) ![]const u8 {
+
     }
 };
 
 const Packet = struct {
     ally: std.mem.Allocator,
-    nonce: [AES.tag_length]u8,
+    nonce: [AES.nonce_length]u8,
+    tag: [AES.tag_length]u8,
 
     cipher_text: []u8,
 };