diff --git a/hacl-star-snapshot/primitives-js/Primitives.ml b/hacl-star-snapshot/primitives-js/Primitives.ml
index 26229bd..fa91c50 100644
--- a/hacl-star-snapshot/primitives-js/Primitives.ml
+++ b/hacl-star-snapshot/primitives-js/Primitives.ml
@@ -82,11 +82,32 @@ let chacha20_poly1305_decrypt ~key ~iv ~ad ~ct ~tag =
   | Some pt -> Some (H.bytes_of_uint8array pt)
   | None -> None
 
+external whacl_aes128gcm_encrypt:
+  js_u8array -> js_u8array -> js_u8array -> js_u8array -> js_u8array Js.js_array Js.t
+= "whacl_aes128gcm_encrypt"
 
 let aes128gcm_encrypt ~key ~iv ~ad ~pt =
-  ignore (key, iv, ad, pt);
-  failwith "Not implemented in JS: aes128gcm_encrypt"
+  let key = H.uint8array_of_bytes key in
+  let iv = H.uint8array_of_bytes iv in
+  let ad = H.uint8array_of_bytes ad in
+  let pt = H.uint8array_of_bytes pt in
+  let ret = whacl_aes128gcm_encrypt key iv ad pt in
+  let ret = Js.to_array ret in
+  let ct = H.bytes_of_uint8array ret.(0) in
+  let tag = H.bytes_of_uint8array ret.(1) in
+  FStar_Seq_Base.append ct tag
+
+external whacl_aes128gcm_decrypt:
+  js_u8array -> js_u8array -> js_u8array -> js_u8array -> js_u8array -> js_u8array Js.Opt.t
+= "whacl_aes128gcm_decrypt"
 
 let aes128gcm_decrypt ~key ~iv ~ad ~ct ~tag =
-  ignore (key, iv, ad, ct, tag);
-  failwith "Not implemented in JS: aes128gcm_decrypt"
+  let key = H.uint8array_of_bytes key in
+  let iv = H.uint8array_of_bytes iv in
+  let ad = H.uint8array_of_bytes ad in
+  let ct = H.uint8array_of_bytes ct in
+  let tag = H.uint8array_of_bytes tag in
+  match Js.Opt.to_option (whacl_aes128gcm_decrypt key iv ad ct tag) with
+  | Some pt -> Some (H.bytes_of_uint8array pt)
+  | None -> None
+
diff --git a/hacl-star-snapshot/primitives-js/dummy.c b/hacl-star-snapshot/primitives-js/dummy.c
index 4327b01..a96bf58 100644
--- a/hacl-star-snapshot/primitives-js/dummy.c
+++ b/hacl-star-snapshot/primitives-js/dummy.c
@@ -37,3 +37,11 @@ CAMLprim value whacl_chacha20_poly1305_encrypt() {
 CAMLprim value whacl_chacha20_poly1305_decrypt() {
   caml_failwith(error_msg);
 }
+
+CAMLprim value whacl_aes128gcm_encrypt() {
+  caml_failwith(error_msg);
+}
+
+CAMLprim value whacl_aes128gcm_decrypt() {
+  caml_failwith(error_msg);
+}
diff --git a/js/MLS_JS.ml b/js/MLS_JS.ml
index 5ba8d1c..25c0f76 100644
--- a/js/MLS_JS.ml
+++ b/js/MLS_JS.ml
@@ -125,12 +125,18 @@ let _ =
 
     (* Expects a JS string that contains the expected ciphersuite *)
     method setCiphersuite (cs: _ Js.t) =
-      match Js.to_string cs with
-      | _ ->
-          (* TODO: actually offer more ciphersuites *)
-          if !crypto_bytes_ <> None then
-            print_and_fail "Cannot dynamically change ciphersuites";
-          crypto_bytes_ := Some MLS_Crypto_Builtins.(mk_concrete_crypto_bytes AC_mls_128_dhkemx25519_chacha20poly1305_sha256_ed25519)
+      let cs = Js.to_string cs in
+      if !crypto_bytes_ <> None then
+        print_and_fail "Cannot dynamically change ciphersuites";
+      let ac = match cs with
+        | "MLS_128_DHKEMX25519_AES128GCM_SHA256_Ed25519" ->
+            MLS_Crypto_Builtins.AC_mls_128_dhkemx25519_aes128gcm_sha256_ed25519
+        | "MLS_128_DHKEMX25519_CHACHA20POLY1305_SHA256_Ed25519" ->
+            AC_mls_128_dhkemx25519_chacha20poly1305_sha256_ed25519
+        | _ ->
+            print_and_fail ("Unsupported ciphersuite: " ^ cs)
+      in
+      crypto_bytes_ := Some MLS_Crypto_Builtins.(mk_concrete_crypto_bytes ac)
 
     (* NEW API: binders for MLS.API.fst (via MLS_API.ml) *)
 
diff --git a/js/index.js b/js/index.js
index 21df5d0..45e78c7 100644
--- a/js/index.js
+++ b/js/index.js
@@ -158,8 +158,31 @@ function HaclCrypto(Hacl) {
         return plain;
       else
         return null;
+    },
+
+    // AES128-GCM implementation relying on OpenSSL via node-crypto to get the
+    // benefits of hardware acceleration with AESNI
+    aes128gcm_encrypt: (key, iv, ad, pt) => {
+      let cipher = node_crypto.createCipheriv("id-aes128-GCM", key, iv, { authTagLength: 16 });
+      cipher.setAAD(ad);
+      let ct = cipher.update(pt);
+      cipher.final();
+      return [ new Uint8Array(ct.buffer), new Uint8Array(cipher.getAuthTag().buffer) ];
+    },
+
+    aes128gcm_decrypt: (key, iv, ad, ct, tag) => {
+      let decipher = node_crypto.createDecipheriv("id-aes128-GCM", key, iv, { authTagLength: 16 });
+      decipher.setAAD(ad);
+      let pt = decipher.update(ct);
+      decipher.setAuthTag(tag);
+      try {
+        decipher.final();
+        return pt;
+      } catch (e) {
+        return null;
+      }
     }
-  };
+  }
 }
 
 if (typeof module !== undefined)
diff --git a/js/overrides.js b/js/overrides.js
index 103be3e..6822ede 100644
--- a/js/overrides.js
+++ b/js/overrides.js
@@ -47,6 +47,16 @@ function whacl_chacha20_poly1305_decrypt(key, iv, ad, ct, tag) {
   return joo_global_object.MyCrypto.chacha20_poly1305_decrypt(key, iv, ad, ct, tag);
 }
 
+//Provides:whacl_aes128gcm_encrypt
+function whacl_aes128gcm_encrypt(key, iv, ad, pt) {
+  return joo_global_object.MyCrypto.aes128gcm_encrypt(key, iv, ad, pt);
+}
+
+//Provides:whacl_aes128gcm_decrypt
+function whacl_aes128gcm_decrypt(key, iv, ad, ct, tag) {
+  return joo_global_object.MyCrypto.aes128gcm_decrypt(key, iv, ad, ct, tag);
+}
+
 // OCaml system stuff
 
 //Provides: caml_thread_initialize const
diff --git a/js/test.js b/js/test.js
index ac52bb6..3d8a4d6 100644
--- a/js/test.js
+++ b/js/test.js
@@ -87,8 +87,10 @@ var test_main = () => {
 var test_new = () => {
   // A test for the new, more general API. We start with some warm-up.
 
-  // This is the only supported one for now, we plan to expose AES-GCM soo.
-  MLS.setCiphersuite("mls_128_dhkemx25519_chacha20poly1305_sha256_ed25519");
+  // Pick either one.
+  // MLS.setCiphersuite("MLS_128_DHKEMX25519_AES128GCM_SHA256_Ed25519");
+  MLS.setCiphersuite("MLS_128_DHKEMX25519_CHACHA20POLY1305_SHA256_Ed25519");
+
   // The source of entropy is customizable.
   MLS.setEntropy((n) => crypto.getRandomValues(new Uint8Array(n)));