diff --git a/packages/m/microsoft-seal/patches/4.1.2/cmake-config-zstd.patch b/packages/m/microsoft-seal/patches/4.1.2/cmake-config-zstd.patch
new file mode 100644
index 00000000000..1bbccd278cd
--- /dev/null
+++ b/packages/m/microsoft-seal/patches/4.1.2/cmake-config-zstd.patch
@@ -0,0 +1,17 @@
+diff --git a/cmake/SEALConfig.cmake.in b/cmake/SEALConfig.cmake.in
+index 45f855e..94ea283 100644
+--- a/cmake/SEALConfig.cmake.in
++++ b/cmake/SEALConfig.cmake.in
+@@ -89,8 +89,10 @@ if(NOT SEAL_CARRY_DEPS)
+         seal_find_dependency(ZLIB)
+     endif()
+     if(SEAL_USE_ZSTD)
+-        seal_find_dependency(zstd)
+-        if(NOT TARGET zstd::libzstd_static)
++        include(FindPkgConfig)
++        pkg_search_module("libzstd" REQUIRED IMPORTED_TARGET "libzstd")
++        set(zstd_static "PkgConfig::libzstd")
++        if(0)
+             if(TARGET libzstd)
+                 get_target_property(libzstd_type libzstd TYPE)
+                 if(libzstd_type STREQUAL "SHARED")
diff --git a/packages/m/microsoft-seal/patches/4.1.2/find-zstd.patch b/packages/m/microsoft-seal/patches/4.1.2/find-zstd.patch
new file mode 100644
index 00000000000..986c33f2826
--- /dev/null
+++ b/packages/m/microsoft-seal/patches/4.1.2/find-zstd.patch
@@ -0,0 +1,18 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index de598c7..0035bf7 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -190,9 +190,10 @@ if(SEAL_USE_ZSTD)
+         seal_fetch_thirdparty_content(ExternalZSTD)
+         set(zstd_static "libzstd_static")
+     else()
+-        find_package(zstd CONFIG)
+-        if(NOT zstd_FOUND)
+-            message(FATAL_ERROR "Zstandard: not found")
++        include(FindPkgConfig)
++        pkg_search_module("libzstd" REQUIRED IMPORTED_TARGET "libzstd")
++        if(libzstd_FOUND)
++            set(zstd_static "PkgConfig::libzstd")
+         else()
+             if(TARGET zstd::libzstd_static)
+                 set(zstd_static "zstd::libzstd_static")
diff --git a/packages/m/microsoft-seal/xmake.lua b/packages/m/microsoft-seal/xmake.lua
new file mode 100644
index 00000000000..a75ffb9d951
--- /dev/null
+++ b/packages/m/microsoft-seal/xmake.lua
@@ -0,0 +1,103 @@
+package("microsoft-seal")
+    set_homepage("https://www.microsoft.com/en-us/research/group/cryptography-research/")
+    set_description("Microsoft SEAL is an easy-to-use and powerful homomorphic encryption library.")
+    set_license("MIT")
+
+    add_urls("https://github.com/microsoft/SEAL/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/microsoft/SEAL.git")
+
+    add_versions("v4.1.2", "acc2a1a127a85d1e1ffcca3ffd148f736e665df6d6b072df0e42fff64795a13c")
+
+    add_configs("zlib", {description = "Enable zlib", default = false, type = "boolean"})
+    add_configs("zstd", {description = "Enable zstd", default = false, type = "boolean"})
+    add_configs("ms_gsl", {description = "Enable microsoft-gsl", default = false, type = "boolean"})
+    add_configs("hexl", {description = "Enable Intel HEXL", default = false, type = "boolean"})
+    add_configs("throw_tran", {description = "Throw an exception when Evaluator outputs a transparent ciphertext", default = false, type = "boolean"})
+    add_configs("gaussian", {description = "Use a rounded Gaussian distribution for noise sampling instead of a Centered Binomial Distribution", default = false, type = "boolean"})
+    add_configs("intrin", {description = "Use intrinsics", default = false, type = "boolean"})
+    add_configs("c_api",  {description = "Builds C API", default = false, type = "boolean", readonly = true})
+    if is_plat("windows") then
+        add_configs("shared", {description = "Build shared library.", default = false, type = "boolean", readonly = true})
+    end
+
+    if is_plat("windows", "mingw") then
+        add_syslinks("bcrypt")
+    elseif is_plat("linux", "bsd") then
+        add_syslinks("pthread")
+    end
+
+    add_deps("cmake")
+
+    on_load(function (package)
+        if package:config("zstd") then
+            package:add("deps", "zstd")
+            package:add("deps", (is_subhost("windows") and "pkgconf") or "pkg-config")
+            package:add("patches", "4.1.2", "patches/4.1.2/find-zstd.patch", "d7261a78d6cc873b3563610429dbfa7eb8c67fa410825eb1b180a06f02dd5f1e")
+            package:add("patches", "4.1.2", "patches/4.1.2/cmake-config-zstd.patch", "a2291f35ee40ef52c021e709dcab2a5414381c0eafeb36efce15ecb4b423114a")
+        end
+        if package:config("zlib") then
+            package:add("deps", "zlib")
+        end
+        if package:config("ms_gsl") then
+            package:add("deps", "microsoft-gsl")
+        end
+        if package:config("hexl") then
+            package:add("deps", "hexl")
+        end
+
+        local version = package:version()
+        if version then
+            package:add("includedirs", format("include/SEAL-%s.%s", version:major(), version:minor()))
+        else
+            package:add("includedirs", "include/SEAL-4.1")
+        end
+    end)
+
+    -- TODO: Fix cmake try_run
+    on_install("!iphoneos", function (package)
+        io.replace("CMakeLists.txt", "if(WIN32 AND BUILD_SHARED_LIBS)", "if(0)", {plain = true})
+        if package:config("hexl") then
+            io.replace("CMakeLists.txt", "1.2.4", "", {plain = true})
+        end
+        if package:is_plat("windows", "mingw") then
+            io.replace("cmake/SEALMacros.cmake", "target_link_libraries(${target} PUBLIC Threads::Threads)",
+                "target_link_libraries(${target} PUBLIC Threads::Threads bcrypt)", {plain = true})
+        end
+
+        local configs = {"-DSEAL_BUILD_DEPS=OFF"}
+        table.insert(configs, "-DCMAKE_BUILD_TYPE=" .. (package:is_debug() and "Debug" or "Release"))
+        table.insert(configs, "-DBUILD_SHARED_LIBS=" .. (package:config("shared") and "ON" or "OFF"))
+        if package:config("shared") and package:is_plat("windows") then
+            table.insert(configs, "-DCMAKE_WINDOWS_EXPORT_ALL_SYMBOLS=ON")
+        end
+
+        table.insert(configs, "-DSEAL_USE_ZLIB=" .. (package:config("zlib") and "ON" or "OFF"))
+        table.insert(configs, "-DSEAL_USE_ZSTD=" .. (package:config("zstd") and "ON" or "OFF"))
+        table.insert(configs, "-DSEAL_USE_MSGSL=" .. (package:config("ms_gsl") and "ON" or "OFF"))
+        table.insert(configs, "-DSEAL_USE_INTEL_HEXL=" .. (package:config("hexl") and "ON" or "OFF"))
+        table.insert(configs, "-DSEAL_THROW_ON_TRANSPARENT_CIPHERTEXT=" .. (package:config("throw_tran") and "ON" or "OFF"))
+        table.insert(configs, "-DSEAL_USE_GAUSSIAN_NOISE=" .. (package:config("gaussian") and "ON" or "OFF"))
+        table.insert(configs, "-DSEAL_BUILD_SEAL_C=" .. (package:config("c_api") and "ON" or "OFF"))
+        table.insert(configs, "-DSEAL_USE_INTRIN=" .. (package:config("intrin") and "ON" or "OFF"))
+
+        if package:is_plat("mingw") then
+            -- No aligned malloc implementation on MinGW
+            -- https://github.com/ebassi/graphene/issues/83
+            table.insert(configs, "-DSEAL_USE_ALIGNED_ALLOC=OFF")
+        end
+        import("package.tools.cmake").install(package, configs)
+
+        if package:is_plat("windows") and package:is_debug() then
+            local dir = package:installdir(package:config("shared") and "bin" or "lib")
+            os.vcp(path.join(package:buildir(), "**.pdb"), dir)
+        end
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            using namespace seal;
+            void test() {
+                EncryptionParameters parms(scheme_type::bfv);
+            }
+        ]]}, {configs = {languages = "c++17"}, includes = {"seal/seal.h"}}))
+    end)