diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..567609b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+build/
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..6230862
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "SEAL"]
+	path = SEAL
+	url = https://github.com/microsoft/SEAL.git
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..2caf2af
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,40 @@
+cmake_minimum_required(VERSION 3.28)
+project(homcert LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# Allow customizing what components to build
+option(HOMCERT_BUILD_TESTS "Build homcert tests" OFF)
+option(HOMCERT_BFV_SEAL "Provide BFV implementation using Microsoft SEAL" ON)
+
+if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
+	set(HOMCERT_BUILD_TESTS ON CACHE BOOL "Enable homcert tests" FORCE)
+endif()
+
+# Include lib crypto
+find_package(OpenSSL REQUIRED)
+
+# Make homcert main library
+add_library(homcert "")
+target_link_libraries(homcert PRIVATE OpenSSL::Crypto)
+target_include_directories(homcert PUBLIC include)
+
+target_compile_definitions(homcert PRIVATE
+	$<$<BOOL:${HOMCERT_BFV_SEAL}>:HOMCERT_BFV_SEAL>
+)
+
+if (HOMCERT_BFV_SEAL)
+	set(SEAL_BUILD_TESTS OFF CACHE BOOL "Disable SEAL tests" FORCE)
+	set(SEAL_BUILD_BENCH OFF CACHE BOOL "Disable SEAL benchmarks" FORCE)
+	set(SEAL_BUILD_EXAMPLES OFF CACHE BOOL "Disable SEAL examples" FORCE)
+	add_subdirectory(SEAL)
+
+	target_link_libraries(homcert PRIVATE SEAL::seal)
+endif()
+
+add_subdirectory(src)
+
+if (HOMCERT_BUILD_TESTS)
+	add_subdirectory(test)
+endif()
diff --git a/SEAL b/SEAL
new file mode 160000
index 0000000..7a931d5
--- /dev/null
+++ b/SEAL
@@ -0,0 +1 @@
+Subproject commit 7a931d55ba84a40b85938f6ca3ac206f18654093
diff --git a/include/bfv.hpp b/include/bfv.hpp
index 21ed5d9..0c21c17 100644
--- a/include/bfv.hpp
+++ b/include/bfv.hpp
@@ -3,6 +3,10 @@
 #include <cstdint>
 #include <type_traits>
 #include <bit>
+#include <stdexcept>
+#include <string>
+#include <array>
+#include <memory>
 
 namespace homcert::bfv {
 
@@ -42,7 +46,26 @@ struct plaintext {
 
 using ciphertext = int;
 
-// TODO -> Exception with enum that differentiates reason (e.g. CONTEXT_NO_PRIVATE)
+// Exception for BFV errors in context
+
+class bfv_exception : public std::exception {
+public:
+	enum class REASON {
+		CTX_NO_PRIVATE,
+		CTX_NO_PUBLIC,
+		CTX_ARITHMETIC,
+		CTX_MEMORY,
+		CTX_INVALID_ARGUMENT,
+		CTX_COMPONENT
+	};
+private:
+	REASON m_reason;
+	std::string m_message;
+public:
+	bfv_exception(REASON reason, std::string message);
+	REASON reason() const noexcept;
+	const char* what() const noexcept override;
+};
 
 // Inheriting from context class allows pluggability of implementations (e.g. SEAL vs. GPU)
 
@@ -50,7 +73,7 @@ struct context {
 	static constexpr int PUBLIC_COMPONENT = 1;
 	static constexpr int PRIVATE_COMPONENT = 2;
 
-	virtual ~context();
+	virtual ~context() = default;
 
 	virtual void new_components(int components) = 0; // context default constructs empty
 	virtual void has_components(int components) const = 0;
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
new file mode 100644
index 0000000..cc5664e
--- /dev/null
+++ b/src/CMakeLists.txt
@@ -0,0 +1 @@
+target_sources(homcert PRIVATE bfv.cpp)
diff --git a/src/bfv.cpp b/src/bfv.cpp
new file mode 100644
index 0000000..7e6e7ae
--- /dev/null
+++ b/src/bfv.cpp
@@ -0,0 +1,16 @@
+#include "bfv.hpp"
+
+namespace homcert::bfv {
+
+bfv_exception::bfv_exception(REASON reason, std::string message)
+	: m_reason(reason), m_message(std::move(message)) {}
+
+bfv_exception::REASON bfv_exception::reason() const noexcept {
+	return m_reason;
+}
+
+const char* bfv_exception::what() const noexcept {
+	return m_message.c_str();
+}
+
+};
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
new file mode 100644
index 0000000..af52a7e
--- /dev/null
+++ b/test/CMakeLists.txt
@@ -0,0 +1,6 @@
+find_package(GTest REQUIRED)
+
+if (HOMCERT_BFV_SEAL)
+	add_executable(test_bfv bfv/main.cpp)
+	target_link_libraries(test_bfv PRIVATE homcert GTest::GTest)
+endif()
diff --git a/test/bfv/main.cpp b/test/bfv/main.cpp
new file mode 100644
index 0000000..aed80f0
--- /dev/null
+++ b/test/bfv/main.cpp
@@ -0,0 +1,31 @@
+#include <iostream>
+#include <cstddef>
+#include <memory>
+#include <gtest/gtest.h>
+
+#include <bfv.hpp>
+
+using namespace homcert;
+
+class BFV : public ::testing::Test {
+protected:
+	std::shared_ptr<bfv::context> m_context;
+};
+
+class BFV_SEAL : public BFV {
+protected:
+	static void SetUpTestSuite() {
+		// GTEST_SKIP() << "Test environment not available";
+	}
+
+	static void TearDownTestSuite() {}
+};
+
+TEST_F(BFV_SEAL, XXX) {
+
+}
+
+int main(int argc, char** argv) {
+	testing::InitGoogleTest(&argc, argv);
+	return RUN_ALL_TESTS();
+}