diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..c369d231
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,9 @@
+[submodule "thirdparty/libtomcrypt"]
+	path = thirdparty/libtomcrypt
+	url = https://github.com/libtom/libtomcrypt.git
+[submodule "thirdparty/libtommath"]
+	path = thirdparty/libtommath
+	url = https://github.com/libtom/libtommath
+[submodule "thirdparty/zlib"]
+	path = thirdparty/zlib
+	url = https://github.com/madler/zlib.git
diff --git a/thirdparty/libtomcrypt b/thirdparty/libtomcrypt
new file mode 160000
index 00000000..7e7eb695
--- /dev/null
+++ b/thirdparty/libtomcrypt
@@ -0,0 +1 @@
+Subproject commit 7e7eb695d581782f04b24dc444cbfde86af59853
diff --git a/thirdparty/libtommath b/thirdparty/libtommath
new file mode 160000
index 00000000..08549ad6
--- /dev/null
+++ b/thirdparty/libtommath
@@ -0,0 +1 @@
+Subproject commit 08549ad6bc8b0cede0b357a9c341c5c6473a9c55
diff --git a/thirdparty/zlib b/thirdparty/zlib
new file mode 160000
index 00000000..cacf7f1d
--- /dev/null
+++ b/thirdparty/zlib
@@ -0,0 +1 @@
+Subproject commit cacf7f1d4e3d44d871b605da3b647f07d718623f