Include libtomcrypt for future rsa signing.

.gitmodules

@@ -11,3 +11,6 @@
 [submodule "deps/pdcurses"]
 	path = deps/pdcurses
 	url = git://git.code.sf.net/p/pdcurses/code
+[submodule "deps/libtomcrypt"]
+	path = deps/libtomcrypt
+	url = https://github.com/libtom/libtomcrypt

deps/libtomcrypt

@@ -0,0 +1 @@
+Subproject commit 912eff4949f46c0b426d2180429a6fa4c1144f1d

premake5.lua

@@ -100,8 +100,15 @@ workspace "iw4x"
 		buildoptions { "-Zm200" } -- allocate ~150mb memory for the precompiled header. This should be enough, increase if necessary
 
 		-- Dependency on zlib, json11 and asio
-		links { "zlib", "json11", "pdcurses" }
-		includedirs { "./deps/zlib", "./deps/json11", "./deps/pdcurses", "./deps/asio/asio/include"  }
+		links { "zlib", "json11", "pdcurses", "libtomcrypt" }
+		includedirs 
+		{ 
+			"./deps/zlib",
+			"./deps/json11", 
+			"./deps/pdcurses", 
+			"./deps/asio/asio/include",
+			"./deps/libtomcrypt/src/headers",
+		}
 
 		-- Virtual paths
 		if not _OPTIONS["no-new-structure"] then
@@ -193,3 +200,24 @@ workspace "iw4x"
 
 			-- always build as static lib, as pdcurses doesn't export anything
 			kind "StaticLib"
+
+		-- libtomcrypt
+		project "libtomcrypt"
+			language "C"
+			defines { "_LIB", "LTC_SOURCE" }
+			includedirs { "./deps/libtomcrypt/src/headers"  }
+
+			files
+			{
+				"./deps/libtomcrypt/src/**.c",
+				"./deps/libtomcrypt/src/**.h"
+			}
+			
+			-- remove ocb3 code
+			removefiles { "./deps/libtomcrypt/src/encauth/ocb3/**.c" }
+
+			-- not our code, ignore POSIX usage warnings for now
+			warnings "Off"
+
+			-- always build as static lib, as pdcurses doesn't export anything
+			kind "StaticLib"