Merge `signal-protocol` into `omemo` plugin

Same reasoning as for the `openpgp` plugin.

21 files changed, 706 insertions, 758 deletions

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e3a6a2b7..590035e0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -13,7 +13,7 @@ jobs:
       - run: ./configure --with-tests --with-libsignal-in-tree
       - run: make
       - run: build/xmpp-vala-test
-      - run: build/signal-protocol-vala-test
+      - run: build/omemo-test
   build-meson:
     runs-on: ubuntu-22.04
     steps:
diff --git a/plugins/CMakeLists.txt b/plugins/CMakeLists.txt
index 3ce96815..03d7f575 100644
--- a/plugins/CMakeLists.txt
+++ b/plugins/CMakeLists.txt
@@ -1,6 +1,3 @@
 foreach(plugin ${PLUGINS})
-  if ("omemo" STREQUAL ${plugin})
-    add_subdirectory(signal-protocol)
-  endif ()
   add_subdirectory(${plugin})
 endforeach(plugin)
diff --git a/plugins/omemo/CMakeLists.txt b/plugins/omemo/CMakeLists.txt
index dc9a93b0..7ecaa0b8 100644
--- a/plugins/omemo/CMakeLists.txt
+++ b/plugins/omemo/CMakeLists.txt
@@ -12,6 +12,11 @@ find_packages(OMEMO_PACKAGES REQUIRED
     GTK4
 )
 
+# libsignal-protocol-c has a history of breaking compatibility on the patch level
+# we'll have to check compatibility for every new release
+# distro maintainers may update this dependency after compatibility tests
+find_package(SignalProtocol 2.3.2 REQUIRED)
+
 set(RESOURCE_LIST
     contact_details_dialog.ui
     manage_key_dialog.ui
@@ -52,6 +57,14 @@ SOURCES
     src/protocol/message_flag.vala
     src/protocol/stream_module.vala
 
+    src/signal/context.vala
+    src/signal/simple_iks.vala
+    src/signal/simple_ss.vala
+    src/signal/simple_pks.vala
+    src/signal/simple_spks.vala
+    src/signal/store.vala
+    src/signal/util.vala
+
     src/ui/account_settings_entry.vala
     src/ui/bad_messages_populator.vala
     src/ui/call_encryption_entry.vala
@@ -64,22 +77,52 @@ SOURCES
     src/ui/util.vala
 CUSTOM_VAPIS
     ${CMAKE_BINARY_DIR}/exports/crypto-vala.vapi
-    ${CMAKE_BINARY_DIR}/exports/signal-protocol.vapi
     ${CMAKE_BINARY_DIR}/exports/xmpp-vala.vapi
     ${CMAKE_BINARY_DIR}/exports/qlite.vapi
     ${CMAKE_BINARY_DIR}/exports/dino.vapi
     ${CMAKE_CURRENT_SOURCE_DIR}/vapi/libqrencode.vapi
+    ${CMAKE_CURRENT_SOURCE_DIR}/vapi/libsignal-protocol-c.vapi
 PACKAGES
     ${OMEMO_PACKAGES}
 GRESOURCES
     ${OMEMO_GRESOURCES_XML}
+GENERATE_VAPI
+    omemo
+GENERATE_HEADER
+    omemo
 )
 
-add_definitions(${VALA_CFLAGS} -DGETTEXT_PACKAGE=\"${GETTEXT_PACKAGE}\" -DLOCALE_INSTALL_DIR=\"${LOCALE_INSTALL_DIR}\"  -DG_LOG_DOMAIN="OMEMO")
-add_library(omemo SHARED ${OMEMO_VALA_C} ${OMEMO_GRESOURCES_TARGET})
+add_definitions(${VALA_CFLAGS} -DGETTEXT_PACKAGE=\"${GETTEXT_PACKAGE}\" -DLOCALE_INSTALL_DIR=\"${LOCALE_INSTALL_DIR}\" -DG_LOG_DOMAIN="OMEMO")
+add_library(omemo SHARED ${OMEMO_VALA_C} ${OMEMO_GRESOURCES_TARGET} ${CMAKE_CURRENT_SOURCE_DIR}/src/signal/signal_helper.c)
 add_dependencies(omemo ${GETTEXT_PACKAGE}-translations)
-target_link_libraries(omemo libdino signal-protocol-vala crypto-vala ${OMEMO_PACKAGES} libqrencode)
+target_include_directories(omemo PUBLIC src)
+target_link_libraries(omemo libdino crypto-vala gcrypt ${OMEMO_PACKAGES} libqrencode signal-protocol-c)
 set_target_properties(omemo PROPERTIES PREFIX "")
 set_target_properties(omemo PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/plugins/)
 
 install(TARGETS omemo ${PLUGIN_INSTALL})
+
+if(BUILD_TESTS)
+    vala_precompile(OMEMO_TEST_VALA_C
+    SOURCES
+        "tests/signal/common.vala"
+        "tests/signal/testcase.vala"
+
+        "tests/signal/curve25519.vala"
+        "tests/signal/hkdf.vala"
+        "tests/signal/session_builder.vala"
+    CUSTOM_VAPIS
+        ${CMAKE_BINARY_DIR}/exports/omemo_internal.vapi
+        ${CMAKE_BINARY_DIR}/exports/qlite.vapi
+        ${CMAKE_BINARY_DIR}/exports/xmpp-vala.vapi
+        ${CMAKE_BINARY_DIR}/exports/dino.vapi
+        ${CMAKE_CURRENT_SOURCE_DIR}/vapi/libsignal-protocol-c.vapi
+    PACKAGES
+        ${OMEMO_PACKAGES}
+    )
+
+    set(CFLAGS ${VALA_CFLAGS})
+    add_executable(omemo-test ${OMEMO_TEST_VALA_C})
+    add_dependencies(omemo-test omemo)
+    target_link_libraries(omemo-test omemo ${OMEMO_PACKAGES})
+endif(BUILD_TESTS)
diff --git a/plugins/signal-protocol/src/context.vala b/plugins/omemo/src/signal/context.vala
index 40a07b0f..40a07b0f 100644
--- a/plugins/signal-protocol/src/context.vala
+++ b/plugins/omemo/src/signal/context.vala
diff --git a/plugins/signal-protocol/src/signal_helper.c b/plugins/omemo/src/signal/signal_helper.c
index 1a428c44..17682929 100644
--- a/plugins/signal-protocol/src/signal_helper.c
+++ b/plugins/omemo/src/signal/signal_helper.c
@@ -1,4 +1,4 @@
-#include <signal_helper.h>
+#include "signal_helper.h"
 
 #include <gcrypt.h>
 
diff --git a/plugins/signal-protocol/src/signal_helper.h b/plugins/omemo/src/signal/signal_helper.h
index 949a3c7b..949a3c7b 100644
--- a/plugins/signal-protocol/src/signal_helper.h
+++ b/plugins/omemo/src/signal/signal_helper.h
diff --git a/plugins/signal-protocol/src/simple_iks.vala b/plugins/omemo/src/signal/simple_iks.vala
index 5247c455..5247c455 100644
--- a/plugins/signal-protocol/src/simple_iks.vala
+++ b/plugins/omemo/src/signal/simple_iks.vala
diff --git a/plugins/signal-protocol/src/simple_pks.vala b/plugins/omemo/src/signal/simple_pks.vala
index 1f059fda..1f059fda 100644
--- a/plugins/signal-protocol/src/simple_pks.vala
+++ b/plugins/omemo/src/signal/simple_pks.vala
diff --git a/plugins/signal-protocol/src/simple_spks.vala b/plugins/omemo/src/signal/simple_spks.vala
index f0fe09ab..f0fe09ab 100644
--- a/plugins/signal-protocol/src/simple_spks.vala
+++ b/plugins/omemo/src/signal/simple_spks.vala
diff --git a/plugins/signal-protocol/src/simple_ss.vala b/plugins/omemo/src/signal/simple_ss.vala
index 5213f736..5213f736 100644
--- a/plugins/signal-protocol/src/simple_ss.vala
+++ b/plugins/omemo/src/signal/simple_ss.vala
diff --git a/plugins/signal-protocol/src/store.vala b/plugins/omemo/src/signal/store.vala
index b440d838..b440d838 100644
--- a/plugins/signal-protocol/src/store.vala
+++ b/plugins/omemo/src/signal/store.vala
diff --git a/plugins/signal-protocol/src/util.vala b/plugins/omemo/src/signal/util.vala
index 4c0ae72d..4c0ae72d 100644
--- a/plugins/signal-protocol/src/util.vala
+++ b/plugins/omemo/src/signal/util.vala
diff --git a/plugins/signal-protocol/tests/common.vala b/plugins/omemo/tests/signal/common.vala
index 9bb9b1dc..9bb9b1dc 100644
--- a/plugins/signal-protocol/tests/common.vala
+++ b/plugins/omemo/tests/signal/common.vala
diff --git a/plugins/signal-protocol/tests/curve25519.vala b/plugins/omemo/tests/signal/curve25519.vala
index 6dfae62f..6dfae62f 100644
--- a/plugins/signal-protocol/tests/curve25519.vala
+++ b/plugins/omemo/tests/signal/curve25519.vala
diff --git a/plugins/signal-protocol/tests/hkdf.vala b/plugins/omemo/tests/signal/hkdf.vala
index c30af275..c30af275 100644
--- a/plugins/signal-protocol/tests/hkdf.vala
+++ b/plugins/omemo/tests/signal/hkdf.vala
diff --git a/plugins/signal-protocol/tests/session_builder.vala b/plugins/omemo/tests/signal/session_builder.vala
index 7e2448e1..7e2448e1 100644
--- a/plugins/signal-protocol/tests/session_builder.vala
+++ b/plugins/omemo/tests/signal/session_builder.vala
diff --git a/plugins/signal-protocol/tests/testcase.vala b/plugins/omemo/tests/signal/testcase.vala
index 59fcf193..59fcf193 100644
--- a/plugins/signal-protocol/tests/testcase.vala
+++ b/plugins/omemo/tests/signal/testcase.vala
diff --git a/plugins/omemo/vapi/libsignal-protocol-c.vapi b/plugins/omemo/vapi/libsignal-protocol-c.vapi
new file mode 100644
index 00000000..7c63d418
--- /dev/null
+++ b/plugins/omemo/vapi/libsignal-protocol-c.vapi
@@ -0,0 +1,657 @@
+namespace Signal {
+
+    [CCode (cname = "int", cprefix = "SG_ERR_", cheader_filename = "signal/signal_protocol.h", has_type_id = false)]
+    public enum ErrorCode {
+        [CCode (cname = "SG_SUCCESS")]
+        SUCCESS,
+        NOMEM,
+        INVAL,
+        UNKNOWN,
+        DUPLICATE_MESSAGE,
+        INVALID_KEY,
+        INVALID_KEY_ID,
+        INVALID_MAC,
+        INVALID_MESSAGE,
+        INVALID_VERSION,
+        LEGACY_MESSAGE,
+        NO_SESSION,
+        STALE_KEY_EXCHANGE,
+        UNTRUSTED_IDENTITY,
+        VRF_SIG_VERIF_FAILED,
+        INVALID_PROTO_BUF,
+        FP_VERSION_MISMATCH,
+        FP_IDENT_MISMATCH;
+    }
+
+    [CCode (cname = "SG_ERR_MINIMUM", cheader_filename = "signal/signal_protocol.h")]
+    public const int MIN_ERROR_CODE;
+
+    [CCode (cname = "int", cprefix = "SG_LOG_", cheader_filename = "signal/signal_protocol.h", has_type_id = false)]
+    public enum LogLevel {
+        ERROR,
+        WARNING,
+        NOTICE,
+        INFO,
+        DEBUG
+    }
+
+    [CCode (cname = "signal_throw_gerror_by_code_", cheader_filename = "signal/signal_protocol.h")]
+    private int throw_by_code(int code, string? message = null) throws GLib.Error {
+        if (code < 0 && code > MIN_ERROR_CODE) {
+            throw new GLib.Error(-1, code, "%s: %s", message ?? "Signal error", ((ErrorCode)code).to_string());
+        }
+        return code;
+    }
+
+    [CCode (cname = "int", cprefix = "SG_CIPHER_", cheader_filename = "signal/signal_protocol.h", has_type_id = false)]
+    public enum Cipher {
+        AES_CTR_NOPADDING,
+        AES_CBC_PKCS5,
+        AES_GCM_NOPADDING
+    }
+
+    [Compact]
+    [CCode (cname = "signal_type_base", ref_function="signal_type_ref_vapi", unref_function="signal_type_unref_vapi", cheader_filename="signal/signal_protocol_types.h,signal/signal_helper.h")]
+    public class TypeBase {
+    }
+
+    [Compact]
+    [CCode (cname = "signal_buffer", cheader_filename = "signal/signal_protocol_types.h", free_function="signal_buffer_free")]
+    public class Buffer {
+        [CCode (cname = "signal_buffer_alloc")]
+        public Buffer(size_t len);
+        [CCode (cname = "signal_buffer_create")]
+        public Buffer.from(uint8[] data);
+
+        public Buffer copy();
+        public Buffer append(uint8[] data);
+        public int compare(Buffer other);
+
+        public uint8 get(int i) { return data[i]; }
+        public void set(int i, uint8 val) { data[i] = val; }
+
+        public uint8[] data { get { int x = (int)len(); unowned uint8[] res = _data(); res.length = x; return res; } }
+
+        [CCode (array_length = false, cname = "signal_buffer_data")]
+        private unowned uint8[] _data();
+        private size_t len();
+    }
+
+    [Compact]
+    [CCode (cname = "signal_int_list", cheader_filename = "signal/signal_protocol_types.h", free_function="signal_int_list_free")]
+    public class IntList {
+        [CCode (cname = "signal_int_list_alloc")]
+        public IntList();
+        [CCode (cname = "signal_int_list_push_back")]
+        public int add(int value);
+        public uint size { [CCode (cname = "signal_int_list_size")] get; }
+        [CCode (cname = "signal_int_list_at")]
+        public int get(uint index);
+    }
+
+    [Compact]
+    [CCode (cname = "session_builder", cprefix = "session_builder_", free_function="session_builder_free", cheader_filename = "signal/session_builder.h")]
+    public class SessionBuilder {
+        [CCode (cname = "session_builder_process_pre_key_bundle")]
+        private int process_pre_key_bundle_(PreKeyBundle pre_key_bundle);
+        [CCode (cname = "session_builder_process_pre_key_bundle_")]
+        public void process_pre_key_bundle(PreKeyBundle pre_key_bundle) throws GLib.Error {
+            throw_by_code(process_pre_key_bundle_(pre_key_bundle));
+        }
+    }
+
+    [Compact]
+    [CCode (cname = "session_pre_key_bundle", cprefix = "session_pre_key_bundle_", cheader_filename = "signal/session_pre_key.h")]
+    public class PreKeyBundle : TypeBase {
+        public static int create(out PreKeyBundle bundle, uint32 registration_id, int device_id, uint32 pre_key_id, ECPublicKey? pre_key_public,
+                uint32 signed_pre_key_id, ECPublicKey? signed_pre_key_public, uint8[]? signed_pre_key_signature, ECPublicKey? identity_key);
+        public uint32 registration_id { get; }
+        public int device_id { get; }
+        public uint32 pre_key_id { get; }
+        public ECPublicKey pre_key { owned get; }
+        public uint32 signed_pre_key_id { get; }
+        public ECPublicKey signed_pre_key { owned get; }
+        public Buffer signed_pre_key_signature { owned get; }
+        public ECPublicKey identity_key { owned get; }
+    }
+
+    [Compact]
+    [CCode (cname = "session_pre_key", cprefix = "session_pre_key_", cheader_filename = "signal/session_pre_key.h,signal/signal_helper.h")]
+    public class PreKeyRecord : TypeBase {
+        public static int create(out PreKeyRecord pre_key, uint32 id, ECKeyPair key_pair);
+        //public static int deserialize(out PreKeyRecord pre_key, uint8[] data, NativeContext global_context);
+        [CCode (instance_pos = 2)]
+        public int serialze(out Buffer buffer);
+        public uint32 id { get; }
+        public ECKeyPair key_pair { get; }
+    }
+
+    [Compact]
+    [CCode (cname = "session_record", cprefix = "session_record_", cheader_filename = "signal/signal_protocol_types.h")]
+    public class SessionRecord : TypeBase {
+        public SessionState state { get; }
+        public Buffer user_record { get; }
+    }
+
+    [Compact]
+    [CCode (cname = "session_state", cprefix = "session_state_", cheader_filename = "signal/session_state.h")]
+    public class SessionState : TypeBase {
+        //public static int create(out SessionState state, NativeContext context);
+        //public static int deserialize(out SessionState state, uint8[] data, NativeContext context);
+        //public static int copy(out SessionState state, SessionState other_state, NativeContext context);
+        [CCode (instance_pos = 2)]
+        public int serialze(out Buffer buffer);
+
+        public uint32 session_version { get; set; }
+        public ECPublicKey local_identity_key { get; set; }
+        public ECPublicKey remote_identity_key { get; set; }
+        //public Ratchet.RootKey root_key { get; set; }
+        public uint32 previous_counter { get; set; }
+        public ECPublicKey sender_ratchet_key { get; }
+        public ECKeyPair sender_ratchet_key_pair { get; }
+        //public Ratchet.ChainKey sender_chain_key { get; set; }
+        public uint32 remote_registration_id { get; set; }
+        public uint32 local_registration_id { get; set; }
+        public int needs_refresh { get; set; }
+        public ECPublicKey alice_base_key { get; set; }
+    }
+
+    [Compact]
+    [CCode (cname = "session_signed_pre_key", cprefix = "session_signed_pre_key_", cheader_filename = "signal/session_pre_key.h")]
+    public class SignedPreKeyRecord : TypeBase {
+        public static int create(out SignedPreKeyRecord pre_key, uint32 id, uint64 timestamp, ECKeyPair key_pair, uint8[] signature);
+        [CCode (instance_pos = 2)]
+        public int serialze(out Buffer buffer);
+
+        public uint32 id { get; }
+        public uint64 timestamp { get; }
+        public ECKeyPair key_pair { get; }
+        public uint8[] signature { [CCode (cname = "session_signed_pre_key_get_signature_")] get { int x = (int)get_signature_len(); unowned uint8[] res = get_signature(); res.length = x; return res; } }
+
+        [CCode (array_length = false, cname = "session_signed_pre_key_get_signature")]
+        private unowned uint8[] get_signature();
+        private size_t get_signature_len();
+    }
+
+    /**
+     * Address of an Signal Protocol message recipient
+     */
+    [Compact]
+    [CCode (cname = "signal_protocol_address", cprefix = "signal_protocol_address_", cheader_filename = "signal/signal_protocol.h,signal/signal_helper.h")]
+    public class Address {
+        public Address(string name, int32 device_id);
+        public int32 device_id { get; set; }
+        public string name { owned get; set; }
+    }
+
+    /**
+     * A representation of a (group + sender + device) tuple
+     */
+    [Compact]
+    [CCode (cname = "signal_protocol_sender_key_name")]
+    public class SenderKeyName {
+        [CCode (cname = "group_id", array_length_cname="group_id_len")]
+        private char* group_id_;
+        private size_t group_id_len;
+        public Address sender;
+    }
+
+    [Compact]
+    [CCode (cname = "ec_public_key", cprefix = "ec_public_key_", cheader_filename = "signal/curve.h,signal/signal_helper.h")]
+    public class ECPublicKey : TypeBase {
+        [CCode (cname = "curve_generate_public_key")]
+        public static int generate(out ECPublicKey public_key, ECPrivateKey private_key);
+        [CCode (instance_pos = 1, cname = "ec_public_key_serialize")]
+        private int serialize_([CCode (pos = 0)] out Buffer buffer);
+        [CCode (cname = "ec_public_key_serialize_")]
+        public uint8[] serialize() {
+            Buffer buffer;
+            int code = serialize_(out buffer);
+            if (code < 0 && code > MIN_ERROR_CODE) {
+                // Can only throw for invalid arguments or out of memory.
+                GLib.assert_not_reached();
+            }
+            return buffer.data;
+        }
+        public int compare(ECPublicKey other);
+        public int memcmp(ECPublicKey other);
+    }
+
+    [Compact]
+    [CCode (cname = "ec_private_key", cprefix = "ec_private_key_", cheader_filename = "signal/curve.h,signal/signal_helper.h")]
+    public class ECPrivateKey : TypeBase {
+        [CCode (instance_pos = 1, cname = "ec_private_key_serialize")]
+        private int serialize_([CCode (pos = 0)] out Buffer buffer);
+        [CCode (cname = "ec_private_key_serialize_")]
+        public uint8[] serialize() throws GLib.Error {
+            Buffer buffer;
+            int code = serialize_(out buffer);
+            if (code < 0 && code > MIN_ERROR_CODE) {
+                // Can only throw for invalid arguments or out of memory.
+                GLib.assert_not_reached();
+            }
+            return buffer.data;
+        }
+        public int compare(ECPublicKey other);
+    }
+
+    [Compact]
+    [CCode (cname = "ec_key_pair", cprefix="ec_key_pair_", cheader_filename = "signal/curve.h,signal/signal_helper.h")]
+    public class ECKeyPair : TypeBase {
+        public static int create(out ECKeyPair key_pair, ECPublicKey public_key, ECPrivateKey private_key);
+        public ECPublicKey public { get; }
+        public ECPrivateKey private { get; }
+    }
+
+    [CCode (cname = "ratchet_message_keys", cheader_filename = "signal/ratchet.h")]
+    public class MessageKeys {
+    }
+
+    [Compact]
+    [CCode (cname = "ratchet_identity_key_pair", cprefix = "ratchet_identity_key_pair_", cheader_filename = "signal/ratchet.h,signal/signal_helper.h")]
+    public class IdentityKeyPair : TypeBase {
+        public static int create(out IdentityKeyPair key_pair, ECPublicKey public_key, ECPrivateKey private_key);
+        public int serialze(out Buffer buffer);
+        public ECPublicKey public { get; }
+        public ECPrivateKey private { get; }
+    }
+
+    [Compact]
+    [CCode (cname = "ec_public_key_list")]
+    public class PublicKeyList {}
+
+    /**
+     * The main entry point for Signal Protocol encrypt/decrypt operations.
+     *
+     * Once a session has been established with session_builder,
+     * this class can be used for all encrypt/decrypt operations within
+     * that session.
+     */
+    [Compact]
+    [CCode (cname = "session_cipher", cprefix = "session_cipher_", cheader_filename = "signal/session_cipher.h", free_function = "session_cipher_free")]
+    public class SessionCipher {
+        public void* user_data { get; set; }
+        public DecryptionCallback decryption_callback { set; }
+        [CCode (cname = "session_cipher_encrypt")]
+        private int encrypt_(uint8[] padded_message, out CiphertextMessage encrypted_message);
+        [CCode (cname = "session_cipher_encrypt_")]
+        public CiphertextMessage encrypt(uint8[] padded_message) throws GLib.Error {
+            CiphertextMessage res;
+            throw_by_code(encrypt_(padded_message, out res));
+            return res;
+        }
+        [CCode (cname = "session_cipher_decrypt_pre_key_signal_message")]
+        private int decrypt_pre_key_signal_message_(PreKeySignalMessage ciphertext, void* decrypt_context, out Buffer plaintext);
+        [CCode (cname = "session_cipher_decrypt_pre_key_signal_message_")]
+        public uint8[] decrypt_pre_key_signal_message(PreKeySignalMessage ciphertext, void* decrypt_context = null) throws GLib.Error {
+            Buffer res;
+            throw_by_code(decrypt_pre_key_signal_message_(ciphertext, decrypt_context, out res));
+            return res.data;
+        }
+        [CCode (cname = "session_cipher_decrypt_signal_message")]
+        private int decrypt_signal_message_(SignalMessage ciphertext, void* decrypt_context, out Buffer plaintext);
+        [CCode (cname = "session_cipher_decrypt_signal_message_")]
+        public uint8[] decrypt_signal_message(SignalMessage ciphertext, void* decrypt_context = null) throws GLib.Error {
+            Buffer res;
+            throw_by_code(decrypt_signal_message_(ciphertext, decrypt_context, out res));
+            return res.data;
+        }
+        public int get_remote_registration_id(out uint32 remote_id);
+        public int get_session_version(uint32 version);
+
+        [CCode (has_target = false)]
+        public delegate int DecryptionCallback(SessionCipher cipher, Buffer plaintext, void* decrypt_context);
+    }
+
+    [CCode (cname = "int", cheader_filename = "signal/protocol.h", has_type_id = false)]
+    public enum CiphertextType {
+        [CCode (cname = "CIPHERTEXT_SIGNAL_TYPE")]
+        SIGNAL,
+        [CCode (cname = "CIPHERTEXT_PREKEY_TYPE")]
+        PREKEY,
+        [CCode (cname = "CIPHERTEXT_SENDERKEY_TYPE")]
+        SENDERKEY,
+        [CCode (cname = "CIPHERTEXT_SENDERKEY_DISTRIBUTION_TYPE")]
+        SENDERKEY_DISTRIBUTION
+    }
+
+    [Compact]
+    [CCode (cname = "ciphertext_message", cprefix = "ciphertext_message_", cheader_filename = "signal/protocol.h,signal/signal_helper.h")]
+    public abstract class CiphertextMessage : TypeBase {
+        public CiphertextType type { get; }
+        [CCode (cname = "ciphertext_message_get_serialized")]
+        private unowned Buffer get_serialized_();
+        public uint8[] serialized { [CCode (cname = "ciphertext_message_get_serialized_")] get {
+            return get_serialized_().data;
+        }}
+    }
+    [Compact]
+    [CCode (cname = "signal_message", cprefix = "signal_message_", cheader_filename = "signal/protocol.h,signal/signal_helper.h")]
+    public class SignalMessage : CiphertextMessage {
+        public ECPublicKey sender_ratchet_key { get; }
+        public uint8 message_version { get; }
+        public uint32 counter { get; }
+        public Buffer body { get; }
+        //public int verify_mac(uint8 message_version, ECPublicKey sender_identity_key, ECPublicKey receiver_identity_key, uint8[] mac, NativeContext global_context);
+        public static int is_legacy(uint8[] data);
+    }
+    [Compact]
+    [CCode (cname = "pre_key_signal_message", cprefix = "pre_key_signal_message_", cheader_filename = "signal/protocol.h,signal/signal_helper.h")]
+    public class PreKeySignalMessage : CiphertextMessage {
+        public uint8 message_version { get; }
+        public ECPublicKey identity_key { get; }
+        public uint32 registration_id { get; }
+        public uint32 pre_key_id { get; }
+        public uint32 signed_pre_key_id { get; }
+        public ECPublicKey base_key { get; }
+        public SignalMessage signal_message { get; }
+    }
+    [Compact]
+    [CCode (cname = "sender_key_message", cprefix = "sender_key_message_", cheader_filename = "signal/protocol.h,signal/signal_helper.h")]
+    public class SenderKeyMessage : CiphertextMessage {
+        public uint32 key_id { get; }
+        public uint32 iteration { get; }
+        public Buffer ciphertext { get; }
+    }
+    [Compact]
+    [CCode (cname = "sender_key_distribution_message", cprefix = "sender_key_distribution_message_", cheader_filename = "signal/protocol.h,signal/signal_helper.h")]
+    public class SenderKeyDistributionMessage : CiphertextMessage {
+        public uint32 id { get; }
+        public uint32 iteration { get; }
+        public Buffer chain_key { get; }
+        public ECPublicKey signature_key { get; }
+    }
+
+    [CCode (cname = "signal_vala_encrypt", cheader_filename = "signal/signal_helper.h")]
+    private static int aes_encrypt_(out Buffer output, int cipher, uint8[] key, uint8[] iv, uint8[] plaintext, void *user_data);
+
+    [CCode (cname = "signal_vala_encrypt_")]
+    public uint8[] aes_encrypt(int cipher, uint8[] key, uint8[] iv, uint8[] plaintext) throws GLib.Error {
+        Buffer buf;
+        throw_by_code(aes_encrypt_(out buf, cipher, key, iv, plaintext, null));
+        return buf.data;
+    }
+
+    [CCode (cname = "signal_vala_decrypt", cheader_filename = "signal/signal_helper.h")]
+    private static int aes_decrypt_(out Buffer output, int cipher, uint8[] key, uint8[] iv, uint8[] ciphertext, void *user_data);
+
+    [CCode (cname = "signal_vala_decrypt_")]
+    public uint8[] aes_decrypt(int cipher, uint8[] key, uint8[] iv, uint8[] ciphertext) throws GLib.Error {
+        Buffer buf;
+        throw_by_code(aes_decrypt_(out buf, cipher, key, iv, ciphertext, null));
+        return buf.data;
+    }
+
+    [Compact]
+    [CCode (cname = "signal_context", cprefix="signal_context_", free_function="signal_context_destroy", cheader_filename = "signal/signal_protocol.h")]
+    public class NativeContext {
+        public static int create(out NativeContext context, void* user_data);
+        public int set_crypto_provider(NativeCryptoProvider crypto_provider);
+        public int set_locking_functions(LockingFunc lock, LockingFunc unlock);
+        public int set_log_function(LogFunc log);
+    }
+    [CCode (has_target = false)]
+    public delegate void LockingFunc(void* user_data);
+    [CCode (has_target = false)]
+    public delegate void LogFunc(LogLevel level, string message, size_t len, void* user_data);
+
+    [Compact]
+    [CCode (cname = "signal_crypto_provider", cheader_filename = "signal/signal_protocol.h")]
+    public struct NativeCryptoProvider {
+        public RandomFunc random_func;
+        public HmacSha256Init hmac_sha256_init_func;
+        public HmacSha256Update hmac_sha256_update_func;
+        public HmacSha256Final hmac_sha256_final_func;
+        public HmacSha256Cleanup hmac_sha256_cleanup_func;
+        public Sha512DigestInit sha512_digest_init_func;
+        public Sha512DigestUpdate sha512_digest_update_func;
+        public Sha512DigestFinal sha512_digest_final_func;
+        public Sha512DigestCleanup sha512_digest_cleanup_func;
+        public CryptFunc encrypt_func;
+        public CryptFunc decrypt_func;
+        public void* user_data;
+    }
+    [CCode (has_target = false)]
+    public delegate int RandomFunc(uint8[] data, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int HmacSha256Init(out void* hmac_context, uint8[] key, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int HmacSha256Update(void* hmac_context, uint8[] data, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int HmacSha256Final(void* hmac_context, out Buffer buffer, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int HmacSha256Cleanup(void* hmac_context, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int Sha512DigestInit(out void* digest_context, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int Sha512DigestUpdate(void* digest_context, uint8[] data, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int Sha512DigestFinal(void* digest_context, out Buffer buffer, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int Sha512DigestCleanup(void* digest_context, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int CryptFunc(out Buffer output, Cipher cipher, uint8[] key, uint8[] iv, uint8[] content, void* user_data);
+
+    [Compact]
+    [CCode (cname = "signal_protocol_session_store", cheader_filename = "signal/signal_protocol.h")]
+    public struct NativeSessionStore {
+        public LoadSessionFunc load_session_func;
+        public GetSubDeviceSessionsFunc get_sub_device_sessions_func;
+        public StoreSessionFunc store_session_func;
+        public ContainsSessionFunc contains_session_func;
+        public DeleteSessionFunc delete_session_func;
+        public DeleteAllSessionsFunc delete_all_sessions_func;
+        public DestroyFunc destroy_func;
+        public void* user_data;
+    }
+    [CCode (has_target = false)]
+    public delegate int LoadSessionFunc(out Buffer record, out Buffer user_record, Address address, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int GetSubDeviceSessionsFunc(out IntList sessions, [CCode (array_length_type = "size_t")] char[] name, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int StoreSessionFunc(Address address, [CCode (array_length_type = "size_t")] uint8[] record, [CCode (array_length_type = "size_t")] uint8[] user_record, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int ContainsSessionFunc(Address address, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int DeleteSessionFunc(Address address, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int DeleteAllSessionsFunc([CCode (array_length_type = "size_t")] char[] name, void* user_data);
+
+    [Compact]
+    [CCode (cname = "signal_protocol_identity_key_store", cheader_filename = "signal/signal_protocol.h")]
+    public struct NativeIdentityKeyStore {
+        GetIdentityKeyPairFunc get_identity_key_pair;
+        GetLocalRegistrationIdFunc get_local_registration_id;
+        SaveIdentityFunc save_identity;
+        IsTrustedIdentityFunc is_trusted_identity;
+        DestroyFunc destroy_func;
+        void* user_data;
+    }
+    [CCode (has_target = false)]
+    public delegate int GetIdentityKeyPairFunc(out Buffer public_data, out Buffer private_data, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int GetLocalRegistrationIdFunc(void* user_data, out uint32 registration_id);
+    [CCode (has_target = false)]
+    public delegate int SaveIdentityFunc(Address address, [CCode (array_length_type = "size_t")] uint8[] key, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int IsTrustedIdentityFunc(Address address, [CCode (array_length_type = "size_t")] uint8[] key, void* user_data);
+
+    [Compact]
+    [CCode (cname = "signal_protocol_pre_key_store", cheader_filename = "signal/signal_protocol.h")]
+    public struct NativePreKeyStore {
+        LoadPreKeyFunc load_pre_key;
+        StorePreKeyFunc store_pre_key;
+        ContainsPreKeyFunc contains_pre_key;
+        RemovePreKeyFunc remove_pre_key;
+        DestroyFunc destroy_func;
+        void* user_data;
+    }
+    [CCode (has_target = false)]
+    public delegate int LoadPreKeyFunc(out Buffer record, uint32 pre_key_id, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int StorePreKeyFunc(uint32 pre_key_id, [CCode (array_length_type = "size_t")] uint8[] record, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int ContainsPreKeyFunc(uint32 pre_key_id, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int RemovePreKeyFunc(uint32 pre_key_id, void* user_data);
+
+
+    [Compact]
+    [CCode (cname = "signal_protocol_signed_pre_key_store", cheader_filename = "signal/signal_protocol.h")]
+    public struct NativeSignedPreKeyStore {
+        LoadPreKeyFunc load_signed_pre_key;
+        StorePreKeyFunc store_signed_pre_key;
+        ContainsPreKeyFunc contains_signed_pre_key;
+        RemovePreKeyFunc remove_signed_pre_key;
+        DestroyFunc destroy_func;
+        void* user_data;
+    }
+
+
+    [Compact]
+    [CCode (cname = "signal_protocol_sender_key_store")]
+    public struct NativeSenderKeyStore {
+        StoreSenderKeyFunc store_sender_key;
+        LoadSenderKeyFunc load_sender_key;
+        DestroyFunc destroy_func;
+        void* user_data;
+    }
+    [CCode (has_target = false)]
+    public delegate int StoreSenderKeyFunc(SenderKeyName sender_key_name, [CCode (array_length_type = "size_t")] uint8[] record, [CCode (array_length_type = "size_t")] uint8[] user_record, void* user_data);
+    [CCode (has_target = false)]
+    public delegate int LoadSenderKeyFunc(out Buffer record, out Buffer user_record, SenderKeyName sender_key_name, void* user_data);
+
+    [CCode (has_target = false)]
+    public delegate void DestroyFunc(void* user_data);
+
+    [Compact]
+    [CCode (cname = "signal_protocol_store_context", cprefix = "signal_protocol_store_context_", free_function="signal_protocol_store_context_destroy", cheader_filename = "signal/signal_protocol.h")]
+    public class NativeStoreContext {
+        public static int create(out NativeStoreContext context, NativeContext global_context);
+        public int set_session_store(NativeSessionStore store);
+        public int set_pre_key_store(NativePreKeyStore store);
+        public int set_signed_pre_key_store(NativeSignedPreKeyStore store);
+        public int set_identity_key_store(NativeIdentityKeyStore store);
+        public int set_sender_key_store(NativeSenderKeyStore store);
+    }
+
+
+    [CCode (cheader_filename = "signal/signal_protocol.h")]
+    namespace Protocol {
+
+        /**
+         * Interface to the pre-key store.
+         * These functions will use the callbacks in the provided
+         * signal_protocol_store_context instance and operate in terms of higher level
+         * library data structures.
+         */
+        [CCode (cprefix = "signal_protocol_pre_key_")]
+        namespace PreKey {
+            public int load_key(NativeStoreContext context, out PreKeyRecord pre_key, uint32 pre_key_id);
+            public int store_key(NativeStoreContext context, PreKeyRecord pre_key);
+            public int contains_key(NativeStoreContext context, uint32 pre_key_id);
+            public int remove_key(NativeStoreContext context, uint32 pre_key_id);
+        }
+
+        [CCode (cprefix = "signal_protocol_signed_pre_key_")]
+        namespace SignedPreKey {
+            public int load_key(NativeStoreContext context, out SignedPreKeyRecord pre_key, uint32 pre_key_id);
+            public int store_key(NativeStoreContext context, SignedPreKeyRecord pre_key);
+            public int contains_key(NativeStoreContext context, uint32 pre_key_id);
+            public int remove_key(NativeStoreContext context, uint32 pre_key_id);
+        }
+
+        /**
+         * Interface to the session store.
+         * These functions will use the callbacks in the provided
+         * signal_protocol_store_context instance and operate in terms of higher level
+         * library data structures.
+         */
+        [CCode (cprefix = "signal_protocol_session_")]
+        namespace Session {
+             public int load_session(NativeStoreContext context, out SessionRecord record, Address address);
+             public int get_sub_device_sessions(NativeStoreContext context, out IntList sessions, char[] name);
+             public int store_session(NativeStoreContext context, Address address, SessionRecord record);
+             public int contains_session(NativeStoreContext context, Address address);
+             public int delete_session(NativeStoreContext context, Address address);
+             public int delete_all_sessions(NativeStoreContext context, char[] name);
+        }
+
+        namespace Identity {
+            public int get_key_pair(NativeStoreContext store_context, out IdentityKeyPair key_pair);
+            public int get_local_registration_id(NativeStoreContext store_context, out uint32 registration_id);
+            public int save_identity(NativeStoreContext store_context, Address address, ECPublicKey identity_key);
+            public int is_trusted_identity(NativeStoreContext store_context, Address address, ECPublicKey identity_key);
+        }
+
+        [CCode (cheader_filename = "signal/key_helper.h", cprefix = "signal_protocol_key_helper_")]
+        namespace KeyHelper {
+            [Compact]
+            [CCode (cname = "signal_protocol_key_helper_pre_key_list_node", cprefix = "signal_protocol_key_helper_key_list_", free_function="signal_protocol_key_helper_key_list_free")]
+            public class PreKeyListNode {
+                public PreKeyRecord element();
+                public PreKeyListNode next();
+            }
+
+            public int generate_identity_key_pair(out IdentityKeyPair key_pair, NativeContext global_context);
+            public int generate_registration_id(out int32 registration_id, int extended_range, NativeContext global_context);
+            public int get_random_sequence(out int value, int max, NativeContext global_context);
+            public int generate_pre_keys(out PreKeyListNode head, uint start, uint count, NativeContext global_context);
+            public int generate_last_resort_pre_key(out PreKeyRecord pre_key, NativeContext global_context);
+            public int generate_signed_pre_key(out SignedPreKeyRecord signed_pre_key, IdentityKeyPair identity_key_pair, uint32 signed_pre_key_id, uint64 timestamp, NativeContext global_context);
+            public int generate_sender_signing_key(out ECKeyPair key_pair, NativeContext global_context);
+            public int generate_sender_key(out Buffer key_buffer, NativeContext global_context);
+            public int generate_sender_key_id(out int32 key_id, NativeContext global_context);
+        }
+    }
+
+    [CCode (cheader_filename = "signal/curve.h")]
+    namespace Curve {
+        [CCode (cname = "curve_calculate_agreement")]
+        public int calculate_agreement([CCode (array_length = false)] out uint8[] shared_key_data, ECPublicKey public_key, ECPrivateKey private_key);
+        [CCode (cname = "curve_calculate_signature")]
+        public int calculate_signature(NativeContext context, out Buffer signature, ECPrivateKey signing_key, uint8[] message);
+        [CCode (cname = "curve_verify_signature")]
+        public int verify_signature(ECPublicKey signing_key, uint8[] message, uint8[] signature);
+    }
+
+    [CCode (cname = "session_builder_create", cheader_filename = "signal/session_builder.h")]
+    public static int session_builder_create(out SessionBuilder builder, NativeStoreContext store, Address remote_address, NativeContext global_context);
+    [CCode (cname = "session_cipher_create", cheader_filename = "signal/session_cipher.h")]
+    public static int session_cipher_create(out SessionCipher cipher, NativeStoreContext store, Address remote_address, NativeContext global_context);
+    [CCode (cname = "pre_key_signal_message_deserialize", cheader_filename = "signal/protocol.h")]
+    public static int pre_key_signal_message_deserialize(out PreKeySignalMessage message, uint8[] data, NativeContext global_context);
+    [CCode (cname = "pre_key_signal_message_copy", cheader_filename = "signal/protocol.h")]
+    public static int pre_key_signal_message_copy(out PreKeySignalMessage message, PreKeySignalMessage other_message, NativeContext global_context);
+    [CCode (cname = "signal_message_create", cheader_filename = "signal/protocol.h")]
+    public static int signal_message_create(out SignalMessage message, uint8 message_version, uint8[] mac_key, ECPublicKey sender_ratchet_key, uint32 counter, uint32 previous_counter, uint8[] ciphertext, ECPublicKey sender_identity_key, ECPublicKey receiver_identity_key, NativeContext global_context);
+    [CCode (cname = "signal_message_deserialize", cheader_filename = "signal/protocol.h")]
+    public static int signal_message_deserialize(out SignalMessage message, uint8[] data, NativeContext global_context);
+    [CCode (cname = "signal_message_copy", cheader_filename = "signal/protocol.h")]
+    public static int signal_message_copy(out SignalMessage message, SignalMessage other_message, NativeContext global_context);
+    [CCode (cname = "curve_generate_key_pair", cheader_filename = "signal/curve.h")]
+    public static int curve_generate_key_pair(NativeContext context, out ECKeyPair key_pair);
+    [CCode (cname = "curve_decode_private_point", cheader_filename = "signal/curve.h")]
+    public static int curve_decode_private_point(out ECPrivateKey public_key, uint8[] key, NativeContext global_context);
+    [CCode (cname = "curve_decode_point", cheader_filename = "signal/curve.h")]
+    public static int curve_decode_point(out ECPublicKey public_key, uint8[] key, NativeContext global_context);
+    [CCode (cname = "curve_generate_private_key", cheader_filename = "signal/curve.h")]
+    public static int curve_generate_private_key(NativeContext context, out ECPrivateKey private_key);
+    [CCode (cname = "ratchet_identity_key_pair_deserialize", cheader_filename = "signal/ratchet.h")]
+    public static int ratchet_identity_key_pair_deserialize(out IdentityKeyPair key_pair, uint8[] data, NativeContext global_context);
+    [CCode (cname = "session_signed_pre_key_deserialize", cheader_filename = "signal/signed_pre_key.h")]
+    public static int session_signed_pre_key_deserialize(out SignedPreKeyRecord pre_key, uint8[] data, NativeContext global_context);
+
+    [Compact]
+    [CCode (cname = "hkdf_context", cprefix = "hkdf_", free_function = "hkdf_destroy", cheader_filename = "signal/hkdf.h")]
+    public class NativeHkdfContext {
+        public static int create(out NativeHkdfContext context, int message_version, NativeContext global_context);
+        public int compare(NativeHkdfContext other);
+        public ssize_t derive_secrets([CCode (array_length = false)] out uint8[] output, uint8[] input_key_material, uint8[] salt, uint8[] info, size_t output_len);
+    }
+
+    [CCode (cname = "setup_signal_vala_crypto_provider", cheader_filename = "signal/signal_helper.h")]
+    public static void setup_crypto_provider(NativeContext context);
+    [CCode (cname = "signal_vala_randomize", cheader_filename = "signal/signal_helper.h")]
+    public static int native_random(uint8[] data);
+}
diff --git a/plugins/signal-protocol/CMakeLists.txt b/plugins/signal-protocol/CMakeLists.txt
deleted file mode 100644
index b3cfae9d..00000000
--- a/plugins/signal-protocol/CMakeLists.txt
+++ /dev/null
@@ -1,91 +0,0 @@
-find_package(GCrypt REQUIRED)
-find_packages(SIGNAL_PROTOCOL_PACKAGES REQUIRED
-    Gee
-    GLib
-    GObject
-)
-
-vala_precompile(SIGNAL_PROTOCOL_VALA_C
-SOURCES
-    "src/context.vala"
-    "src/simple_iks.vala"
-    "src/simple_ss.vala"
-    "src/simple_pks.vala"
-    "src/simple_spks.vala"
-    "src/store.vala"
-    "src/util.vala"
-CUSTOM_VAPIS
-    ${CMAKE_CURRENT_SOURCE_DIR}/vapi/signal-protocol-public.vapi
-    ${CMAKE_CURRENT_SOURCE_DIR}/vapi/signal-protocol-native.vapi
-PACKAGES
-    ${SIGNAL_PROTOCOL_PACKAGES}
-GENERATE_VAPI
-    signal-protocol-vala
-GENERATE_HEADER
-    signal-protocol-vala
-)
-
-set(C_HEADERS_SRC "")
-set(C_HEADERS_TARGET "")
-
-# libsignal-protocol-c has a history of breaking compatibility on the patch level
-# we'll have to check compatibility for every new release
-# distro maintainers may update this dependency after compatibility tests
-find_package(SignalProtocol 2.3.2 REQUIRED)
-
-list(APPEND C_HEADERS_SRC "${CMAKE_CURRENT_SOURCE_DIR}/src/signal_helper.h")
-list(APPEND C_HEADERS_TARGET "${CMAKE_BINARY_DIR}/exports/signal_helper.h")
-
-add_custom_command(OUTPUT "${CMAKE_BINARY_DIR}/exports/signal_helper.h"
-COMMAND
-    cp "${CMAKE_CURRENT_SOURCE_DIR}/src/signal_helper.h" "${CMAKE_BINARY_DIR}/exports/signal_helper.h"
-DEPENDS
-    "${CMAKE_CURRENT_SOURCE_DIR}/src/signal_helper.h"
-COMMENT
-    Copy header file signal_helper.h
-)
-
-add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/exports/signal-protocol.vapi
-COMMAND
-    cat "${CMAKE_CURRENT_SOURCE_DIR}/vapi/signal-protocol-public.vapi" "${CMAKE_BINARY_DIR}/exports/signal-protocol-vala.vapi" > "${CMAKE_BINARY_DIR}/exports/signal-protocol.vapi"
-DEPENDS
-    ${CMAKE_CURRENT_SOURCE_DIR}/vapi/signal-protocol-public.vapi
-    ${CMAKE_BINARY_DIR}/exports/signal-protocol-vala.vapi
-)
-
-add_custom_target(signal-protocol-vapi
-DEPENDS
-    ${CMAKE_BINARY_DIR}/exports/signal-protocol.vapi
-    ${CMAKE_BINARY_DIR}/exports/signal-protocol-vala.h
-    ${C_HEADERS_TARGET}
-)
-
-set(CFLAGS ${VALA_CFLAGS} -I${CMAKE_CURRENT_SOURCE_DIR}/libsignal-protocol-c/src -I${CMAKE_CURRENT_SOURCE_DIR}/src)
-add_definitions(${CFLAGS})
-add_library(signal-protocol-vala STATIC ${SIGNAL_PROTOCOL_VALA_C} ${CMAKE_CURRENT_SOURCE_DIR}/src/signal_helper.c)
-add_dependencies(signal-protocol-vala signal-protocol-vapi)
-target_link_libraries(signal-protocol-vala ${SIGNAL_PROTOCOL_PACKAGES} gcrypt signal-protocol-c m)
-set_property(TARGET signal-protocol-vala PROPERTY POSITION_INDEPENDENT_CODE ON)
-
-if(BUILD_TESTS)
-    vala_precompile(SIGNAL_TEST_VALA_C
-    SOURCES
-        "tests/common.vala"
-        "tests/testcase.vala"
-
-        "tests/curve25519.vala"
-        "tests/hkdf.vala"
-        "tests/session_builder.vala"
-    CUSTOM_VAPIS
-        ${CMAKE_BINARY_DIR}/exports/signal-protocol-vala_internal.vapi
-        ${CMAKE_CURRENT_SOURCE_DIR}/vapi/signal-protocol-public.vapi
-        ${CMAKE_CURRENT_SOURCE_DIR}/vapi/signal-protocol-native.vapi
-    PACKAGES
-        ${SIGNAL_PROTOCOL_PACKAGES}
-    )
-
-    set(CFLAGS ${VALA_CFLAGS} -I${CMAKE_CURRENT_BINARY_DIR}/signal-protocol)
-    add_executable(signal-protocol-vala-test ${SIGNAL_TEST_VALA_C})
-    add_dependencies(signal-protocol-vala-test signal-protocol-vala)
-    target_link_libraries(signal-protocol-vala-test signal-protocol-vala ${SIGNAL_PROTOCOL_PACKAGES})
-endif(BUILD_TESTS)
diff --git a/plugins/signal-protocol/vapi/signal-protocol-native.vapi b/plugins/signal-protocol/vapi/signal-protocol-native.vapi
deleted file mode 100644
index 0bac0317..00000000
--- a/plugins/signal-protocol/vapi/signal-protocol-native.vapi
+++ /dev/null
@@ -1,274 +0,0 @@
-namespace Signal {
-    [Compact]
-    [CCode (cname = "signal_context", cprefix="signal_context_", free_function="signal_context_destroy", cheader_filename = "signal/signal_protocol.h")]
-    public class NativeContext {
-        public static int create(out NativeContext context, void* user_data);
-        public int set_crypto_provider(NativeCryptoProvider crypto_provider);
-        public int set_locking_functions(LockingFunc lock, LockingFunc unlock);
-        public int set_log_function(LogFunc log);
-    }
-    [CCode (has_target = false)]
-    public delegate void LockingFunc(void* user_data);
-    [CCode (has_target = false)]
-    public delegate void LogFunc(LogLevel level, string message, size_t len, void* user_data);
-
-    [Compact]
-    [CCode (cname = "signal_crypto_provider", cheader_filename = "signal/signal_protocol.h")]
-    public struct NativeCryptoProvider {
-        public RandomFunc random_func;
-        public HmacSha256Init hmac_sha256_init_func;
-        public HmacSha256Update hmac_sha256_update_func;
-        public HmacSha256Final hmac_sha256_final_func;
-        public HmacSha256Cleanup hmac_sha256_cleanup_func;
-        public Sha512DigestInit sha512_digest_init_func;
-        public Sha512DigestUpdate sha512_digest_update_func;
-        public Sha512DigestFinal sha512_digest_final_func;
-        public Sha512DigestCleanup sha512_digest_cleanup_func;
-        public CryptFunc encrypt_func;
-        public CryptFunc decrypt_func;
-        public void* user_data;
-    }
-    [CCode (has_target = false)]
-    public delegate int RandomFunc(uint8[] data, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int HmacSha256Init(out void* hmac_context, uint8[] key, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int HmacSha256Update(void* hmac_context, uint8[] data, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int HmacSha256Final(void* hmac_context, out Buffer buffer, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int HmacSha256Cleanup(void* hmac_context, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int Sha512DigestInit(out void* digest_context, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int Sha512DigestUpdate(void* digest_context, uint8[] data, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int Sha512DigestFinal(void* digest_context, out Buffer buffer, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int Sha512DigestCleanup(void* digest_context, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int CryptFunc(out Buffer output, Cipher cipher, uint8[] key, uint8[] iv, uint8[] content, void* user_data);
-
-    [Compact]
-    [CCode (cname = "signal_protocol_session_store", cheader_filename = "signal/signal_protocol.h")]
-    public struct NativeSessionStore {
-        public LoadSessionFunc load_session_func;
-        public GetSubDeviceSessionsFunc get_sub_device_sessions_func;
-        public StoreSessionFunc store_session_func;
-        public ContainsSessionFunc contains_session_func;
-        public DeleteSessionFunc delete_session_func;
-        public DeleteAllSessionsFunc delete_all_sessions_func;
-        public DestroyFunc destroy_func;
-        public void* user_data;
-    }
-    [CCode (has_target = false)]
-    public delegate int LoadSessionFunc(out Buffer record, out Buffer user_record, Address address, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int GetSubDeviceSessionsFunc(out IntList sessions, [CCode (array_length_type = "size_t")] char[] name, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int StoreSessionFunc(Address address, [CCode (array_length_type = "size_t")] uint8[] record, [CCode (array_length_type = "size_t")] uint8[] user_record, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int ContainsSessionFunc(Address address, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int DeleteSessionFunc(Address address, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int DeleteAllSessionsFunc([CCode (array_length_type = "size_t")] char[] name, void* user_data);
-
-    [Compact]
-    [CCode (cname = "signal_protocol_identity_key_store", cheader_filename = "signal/signal_protocol.h")]
-    public struct NativeIdentityKeyStore {
-        GetIdentityKeyPairFunc get_identity_key_pair;
-        GetLocalRegistrationIdFunc get_local_registration_id;
-        SaveIdentityFunc save_identity;
-        IsTrustedIdentityFunc is_trusted_identity;
-        DestroyFunc destroy_func;
-        void* user_data;
-    }
-    [CCode (has_target = false)]
-    public delegate int GetIdentityKeyPairFunc(out Buffer public_data, out Buffer private_data, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int GetLocalRegistrationIdFunc(void* user_data, out uint32 registration_id);
-    [CCode (has_target = false)]
-    public delegate int SaveIdentityFunc(Address address, [CCode (array_length_type = "size_t")] uint8[] key, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int IsTrustedIdentityFunc(Address address, [CCode (array_length_type = "size_t")] uint8[] key, void* user_data);
-
-    [Compact]
-    [CCode (cname = "signal_protocol_pre_key_store", cheader_filename = "signal/signal_protocol.h")]
-    public struct NativePreKeyStore {
-        LoadPreKeyFunc load_pre_key;
-        StorePreKeyFunc store_pre_key;
-        ContainsPreKeyFunc contains_pre_key;
-        RemovePreKeyFunc remove_pre_key;
-        DestroyFunc destroy_func;
-        void* user_data;
-    }
-    [CCode (has_target = false)]
-    public delegate int LoadPreKeyFunc(out Buffer record, uint32 pre_key_id, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int StorePreKeyFunc(uint32 pre_key_id, [CCode (array_length_type = "size_t")] uint8[] record, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int ContainsPreKeyFunc(uint32 pre_key_id, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int RemovePreKeyFunc(uint32 pre_key_id, void* user_data);
-
-
-    [Compact]
-    [CCode (cname = "signal_protocol_signed_pre_key_store", cheader_filename = "signal/signal_protocol.h")]
-    public struct NativeSignedPreKeyStore {
-        LoadPreKeyFunc load_signed_pre_key;
-        StorePreKeyFunc store_signed_pre_key;
-        ContainsPreKeyFunc contains_signed_pre_key;
-        RemovePreKeyFunc remove_signed_pre_key;
-        DestroyFunc destroy_func;
-        void* user_data;
-    }
-
-
-    [Compact]
-    [CCode (cname = "signal_protocol_sender_key_store")]
-    public struct NativeSenderKeyStore {
-        StoreSenderKeyFunc store_sender_key;
-        LoadSenderKeyFunc load_sender_key;
-        DestroyFunc destroy_func;
-        void* user_data;
-    }
-    [CCode (has_target = false)]
-    public delegate int StoreSenderKeyFunc(SenderKeyName sender_key_name, [CCode (array_length_type = "size_t")] uint8[] record, [CCode (array_length_type = "size_t")] uint8[] user_record, void* user_data);
-    [CCode (has_target = false)]
-    public delegate int LoadSenderKeyFunc(out Buffer record, out Buffer user_record, SenderKeyName sender_key_name, void* user_data);
-
-    [CCode (has_target = false)]
-    public delegate void DestroyFunc(void* user_data);
-
-    [Compact]
-    [CCode (cname = "signal_protocol_store_context", cprefix = "signal_protocol_store_context_", free_function="signal_protocol_store_context_destroy", cheader_filename = "signal/signal_protocol.h")]
-    public class NativeStoreContext {
-        public static int create(out NativeStoreContext context, NativeContext global_context);
-        public int set_session_store(NativeSessionStore store);
-        public int set_pre_key_store(NativePreKeyStore store);
-        public int set_signed_pre_key_store(NativeSignedPreKeyStore store);
-        public int set_identity_key_store(NativeIdentityKeyStore store);
-        public int set_sender_key_store(NativeSenderKeyStore store);
-    }
-
-
-    [CCode (cheader_filename = "signal/signal_protocol.h")]
-    namespace Protocol {
-
-        /**
-         * Interface to the pre-key store.
-         * These functions will use the callbacks in the provided
-         * signal_protocol_store_context instance and operate in terms of higher level
-         * library data structures.
-         */
-        [CCode (cprefix = "signal_protocol_pre_key_")]
-        namespace PreKey {
-            public int load_key(NativeStoreContext context, out PreKeyRecord pre_key, uint32 pre_key_id);
-            public int store_key(NativeStoreContext context, PreKeyRecord pre_key);
-            public int contains_key(NativeStoreContext context, uint32 pre_key_id);
-            public int remove_key(NativeStoreContext context, uint32 pre_key_id);
-        }
-
-        [CCode (cprefix = "signal_protocol_signed_pre_key_")]
-        namespace SignedPreKey {
-            public int load_key(NativeStoreContext context, out SignedPreKeyRecord pre_key, uint32 pre_key_id);
-            public int store_key(NativeStoreContext context, SignedPreKeyRecord pre_key);
-            public int contains_key(NativeStoreContext context, uint32 pre_key_id);
-            public int remove_key(NativeStoreContext context, uint32 pre_key_id);
-        }
-
-        /**
-         * Interface to the session store.
-         * These functions will use the callbacks in the provided
-         * signal_protocol_store_context instance and operate in terms of higher level
-         * library data structures.
-         */
-        [CCode (cprefix = "signal_protocol_session_")]
-        namespace Session {
-             public int load_session(NativeStoreContext context, out SessionRecord record, Address address);
-             public int get_sub_device_sessions(NativeStoreContext context, out IntList sessions, char[] name);
-             public int store_session(NativeStoreContext context, Address address, SessionRecord record);
-             public int contains_session(NativeStoreContext context, Address address);
-             public int delete_session(NativeStoreContext context, Address address);
-             public int delete_all_sessions(NativeStoreContext context, char[] name);
-        }
-
-        namespace Identity {
-            public int get_key_pair(NativeStoreContext store_context, out IdentityKeyPair key_pair);
-            public int get_local_registration_id(NativeStoreContext store_context, out uint32 registration_id);
-            public int save_identity(NativeStoreContext store_context, Address address, ECPublicKey identity_key);
-            public int is_trusted_identity(NativeStoreContext store_context, Address address, ECPublicKey identity_key);
-        }
-
-        [CCode (cheader_filename = "signal/key_helper.h", cprefix = "signal_protocol_key_helper_")]
-        namespace KeyHelper {
-            [Compact]
-            [CCode (cname = "signal_protocol_key_helper_pre_key_list_node", cprefix = "signal_protocol_key_helper_key_list_", free_function="signal_protocol_key_helper_key_list_free")]
-            public class PreKeyListNode {
-                public PreKeyRecord element();
-                public PreKeyListNode next();
-            }
-
-            public int generate_identity_key_pair(out IdentityKeyPair key_pair, NativeContext global_context);
-            public int generate_registration_id(out int32 registration_id, int extended_range, NativeContext global_context);
-            public int get_random_sequence(out int value, int max, NativeContext global_context);
-            public int generate_pre_keys(out PreKeyListNode head, uint start, uint count, NativeContext global_context);
-            public int generate_last_resort_pre_key(out PreKeyRecord pre_key, NativeContext global_context);
-            public int generate_signed_pre_key(out SignedPreKeyRecord signed_pre_key, IdentityKeyPair identity_key_pair, uint32 signed_pre_key_id, uint64 timestamp, NativeContext global_context);
-            public int generate_sender_signing_key(out ECKeyPair key_pair, NativeContext global_context);
-            public int generate_sender_key(out Buffer key_buffer, NativeContext global_context);
-            public int generate_sender_key_id(out int32 key_id, NativeContext global_context);
-        }
-    }
-
-    [CCode (cheader_filename = "signal/curve.h")]
-    namespace Curve {
-        [CCode (cname = "curve_calculate_agreement")]
-        public int calculate_agreement([CCode (array_length = false)] out uint8[] shared_key_data, ECPublicKey public_key, ECPrivateKey private_key);
-        [CCode (cname = "curve_calculate_signature")]
-        public int calculate_signature(NativeContext context, out Buffer signature, ECPrivateKey signing_key, uint8[] message);
-        [CCode (cname = "curve_verify_signature")]
-        public int verify_signature(ECPublicKey signing_key, uint8[] message, uint8[] signature);
-    }
-
-    [CCode (cname = "session_builder_create", cheader_filename = "signal/session_builder.h")]
-    public static int session_builder_create(out SessionBuilder builder, NativeStoreContext store, Address remote_address, NativeContext global_context);
-    [CCode (cname = "session_cipher_create", cheader_filename = "signal/session_cipher.h")]
-    public static int session_cipher_create(out SessionCipher cipher, NativeStoreContext store, Address remote_address, NativeContext global_context);
-    [CCode (cname = "pre_key_signal_message_deserialize", cheader_filename = "signal/protocol.h")]
-    public static int pre_key_signal_message_deserialize(out PreKeySignalMessage message, uint8[] data, NativeContext global_context);
-    [CCode (cname = "pre_key_signal_message_copy", cheader_filename = "signal/protocol.h")]
-    public static int pre_key_signal_message_copy(out PreKeySignalMessage message, PreKeySignalMessage other_message, NativeContext global_context);
-    [CCode (cname = "signal_message_create", cheader_filename = "signal/protocol.h")]
-    public static int signal_message_create(out SignalMessage message, uint8 message_version, uint8[] mac_key, ECPublicKey sender_ratchet_key, uint32 counter, uint32 previous_counter, uint8[] ciphertext, ECPublicKey sender_identity_key, ECPublicKey receiver_identity_key, NativeContext global_context);
-    [CCode (cname = "signal_message_deserialize", cheader_filename = "signal/protocol.h")]
-    public static int signal_message_deserialize(out SignalMessage message, uint8[] data, NativeContext global_context);
-    [CCode (cname = "signal_message_copy", cheader_filename = "signal/protocol.h")]
-    public static int signal_message_copy(out SignalMessage message, SignalMessage other_message, NativeContext global_context);
-    [CCode (cname = "curve_generate_key_pair", cheader_filename = "signal/curve.h")]
-    public static int curve_generate_key_pair(NativeContext context, out ECKeyPair key_pair);
-    [CCode (cname = "curve_decode_private_point", cheader_filename = "signal/curve.h")]
-    public static int curve_decode_private_point(out ECPrivateKey public_key, uint8[] key, NativeContext global_context);
-    [CCode (cname = "curve_decode_point", cheader_filename = "signal/curve.h")]
-    public static int curve_decode_point(out ECPublicKey public_key, uint8[] key, NativeContext global_context);
-    [CCode (cname = "curve_generate_private_key", cheader_filename = "signal/curve.h")]
-    public static int curve_generate_private_key(NativeContext context, out ECPrivateKey private_key);
-    [CCode (cname = "ratchet_identity_key_pair_deserialize", cheader_filename = "signal/ratchet.h")]
-    public static int ratchet_identity_key_pair_deserialize(out IdentityKeyPair key_pair, uint8[] data, NativeContext global_context);
-    [CCode (cname = "session_signed_pre_key_deserialize", cheader_filename = "signal/signed_pre_key.h")]
-    public static int session_signed_pre_key_deserialize(out SignedPreKeyRecord pre_key, uint8[] data, NativeContext global_context);
-
-    [Compact]
-    [CCode (cname = "hkdf_context", cprefix = "hkdf_", free_function = "hkdf_destroy", cheader_filename = "signal/hkdf.h")]
-    public class NativeHkdfContext {
-        public static int create(out NativeHkdfContext context, int message_version, NativeContext global_context);
-        public int compare(NativeHkdfContext other);
-        public ssize_t derive_secrets([CCode (array_length = false)] out uint8[] output, uint8[] input_key_material, uint8[] salt, uint8[] info, size_t output_len);
-    }
-
-    [CCode (cname = "setup_signal_vala_crypto_provider", cheader_filename = "signal_helper.h")]
-    public static void setup_crypto_provider(NativeContext context);
-    [CCode (cname = "signal_vala_randomize", cheader_filename = "signal_helper.h")]
-    public static int native_random(uint8[] data);
-}
diff --git a/plugins/signal-protocol/vapi/signal-protocol-public.vapi b/plugins/signal-protocol/vapi/signal-protocol-public.vapi
deleted file mode 100644
index eaf73c0c..00000000
--- a/plugins/signal-protocol/vapi/signal-protocol-public.vapi
+++ /dev/null
@@ -1,384 +0,0 @@
-namespace Signal {
-
-    [CCode (cname = "int", cprefix = "SG_ERR_", cheader_filename = "signal/signal_protocol.h", has_type_id = false)]
-    public enum ErrorCode {
-        [CCode (cname = "SG_SUCCESS")]
-        SUCCESS,
-        NOMEM,
-        INVAL,
-        UNKNOWN,
-        DUPLICATE_MESSAGE,
-        INVALID_KEY,
-        INVALID_KEY_ID,
-        INVALID_MAC,
-        INVALID_MESSAGE,
-        INVALID_VERSION,
-        LEGACY_MESSAGE,
-        NO_SESSION,
-        STALE_KEY_EXCHANGE,
-        UNTRUSTED_IDENTITY,
-        VRF_SIG_VERIF_FAILED,
-        INVALID_PROTO_BUF,
-        FP_VERSION_MISMATCH,
-        FP_IDENT_MISMATCH;
-    }
-
-    [CCode (cname = "SG_ERR_MINIMUM", cheader_filename = "signal/signal_protocol.h")]
-    public const int MIN_ERROR_CODE;
-
-    [CCode (cname = "int", cprefix = "SG_LOG_", cheader_filename = "signal/signal_protocol.h", has_type_id = false)]
-    public enum LogLevel {
-        ERROR,
-        WARNING,
-        NOTICE,
-        INFO,
-        DEBUG
-    }
-
-    [CCode (cname = "signal_throw_gerror_by_code_", cheader_filename = "signal/signal_protocol.h")]
-    private int throw_by_code(int code, string? message = null) throws GLib.Error {
-        if (code < 0 && code > MIN_ERROR_CODE) {
-            throw new GLib.Error(-1, code, "%s: %s", message ?? "Signal error", ((ErrorCode)code).to_string());
-        }
-        return code;
-    }
-
-    [CCode (cname = "int", cprefix = "SG_CIPHER_", cheader_filename = "signal/signal_protocol.h", has_type_id = false)]
-    public enum Cipher {
-        AES_CTR_NOPADDING,
-        AES_CBC_PKCS5,
-        AES_GCM_NOPADDING
-    }
-
-    [Compact]
-    [CCode (cname = "signal_type_base", ref_function="signal_type_ref_vapi", unref_function="signal_type_unref_vapi", cheader_filename="signal/signal_protocol_types.h,signal_helper.h")]
-    public class TypeBase {
-    }
-
-    [Compact]
-    [CCode (cname = "signal_buffer", cheader_filename = "signal/signal_protocol_types.h", free_function="signal_buffer_free")]
-    public class Buffer {
-        [CCode (cname = "signal_buffer_alloc")]
-        public Buffer(size_t len);
-        [CCode (cname = "signal_buffer_create")]
-        public Buffer.from(uint8[] data);
-
-        public Buffer copy();
-        public Buffer append(uint8[] data);
-        public int compare(Buffer other);
-
-        public uint8 get(int i) { return data[i]; }
-        public void set(int i, uint8 val) { data[i] = val; }
-
-        public uint8[] data { get { int x = (int)len(); unowned uint8[] res = _data(); res.length = x; return res; } }
-
-        [CCode (array_length = false, cname = "signal_buffer_data")]
-        private unowned uint8[] _data();
-        private size_t len();
-    }
-
-    [Compact]
-    [CCode (cname = "signal_int_list", cheader_filename = "signal/signal_protocol_types.h", free_function="signal_int_list_free")]
-    public class IntList {
-        [CCode (cname = "signal_int_list_alloc")]
-        public IntList();
-        [CCode (cname = "signal_int_list_push_back")]
-        public int add(int value);
-        public uint size { [CCode (cname = "signal_int_list_size")] get; }
-        [CCode (cname = "signal_int_list_at")]
-        public int get(uint index);
-    }
-
-    [Compact]
-    [CCode (cname = "session_builder", cprefix = "session_builder_", free_function="session_builder_free", cheader_filename = "signal/session_builder.h")]
-    public class SessionBuilder {
-        [CCode (cname = "session_builder_process_pre_key_bundle")]
-        private int process_pre_key_bundle_(PreKeyBundle pre_key_bundle);
-        [CCode (cname = "session_builder_process_pre_key_bundle_")]
-        public void process_pre_key_bundle(PreKeyBundle pre_key_bundle) throws GLib.Error {
-            throw_by_code(process_pre_key_bundle_(pre_key_bundle));
-        }
-    }
-
-    [Compact]
-    [CCode (cname = "session_pre_key_bundle", cprefix = "session_pre_key_bundle_", cheader_filename = "signal/session_pre_key.h")]
-    public class PreKeyBundle : TypeBase {
-        public static int create(out PreKeyBundle bundle, uint32 registration_id, int device_id, uint32 pre_key_id, ECPublicKey? pre_key_public,
-                uint32 signed_pre_key_id, ECPublicKey? signed_pre_key_public, uint8[]? signed_pre_key_signature, ECPublicKey? identity_key);
-        public uint32 registration_id { get; }
-        public int device_id { get; }
-        public uint32 pre_key_id { get; }
-        public ECPublicKey pre_key { owned get; }
-        public uint32 signed_pre_key_id { get; }
-        public ECPublicKey signed_pre_key { owned get; }
-        public Buffer signed_pre_key_signature { owned get; }
-        public ECPublicKey identity_key { owned get; }
-    }
-
-    [Compact]
-    [CCode (cname = "session_pre_key", cprefix = "session_pre_key_", cheader_filename = "signal/session_pre_key.h,signal_helper.h")]
-    public class PreKeyRecord : TypeBase {
-        public static int create(out PreKeyRecord pre_key, uint32 id, ECKeyPair key_pair);
-        //public static int deserialize(out PreKeyRecord pre_key, uint8[] data, NativeContext global_context);
-        [CCode (instance_pos = 2)]
-        public int serialze(out Buffer buffer);
-        public uint32 id { get; }
-        public ECKeyPair key_pair { get; }
-    }
-
-    [Compact]
-    [CCode (cname = "session_record", cprefix = "session_record_", cheader_filename = "signal/signal_protocol_types.h")]
-    public class SessionRecord : TypeBase {
-        public SessionState state { get; }
-        public Buffer user_record { get; }
-    }
-
-    [Compact]
-    [CCode (cname = "session_state", cprefix = "session_state_", cheader_filename = "signal/session_state.h")]
-    public class SessionState : TypeBase {
-        //public static int create(out SessionState state, NativeContext context);
-        //public static int deserialize(out SessionState state, uint8[] data, NativeContext context);
-        //public static int copy(out SessionState state, SessionState other_state, NativeContext context);
-        [CCode (instance_pos = 2)]
-        public int serialze(out Buffer buffer);
-
-        public uint32 session_version { get; set; }
-        public ECPublicKey local_identity_key { get; set; }
-        public ECPublicKey remote_identity_key { get; set; }
-        //public Ratchet.RootKey root_key { get; set; }
-        public uint32 previous_counter { get; set; }
-        public ECPublicKey sender_ratchet_key { get; }
-        public ECKeyPair sender_ratchet_key_pair { get; }
-        //public Ratchet.ChainKey sender_chain_key { get; set; }
-        public uint32 remote_registration_id { get; set; }
-        public uint32 local_registration_id { get; set; }
-        public int needs_refresh { get; set; }
-        public ECPublicKey alice_base_key { get; set; }
-    }
-
-    [Compact]
-    [CCode (cname = "session_signed_pre_key", cprefix = "session_signed_pre_key_", cheader_filename = "signal/session_pre_key.h")]
-    public class SignedPreKeyRecord : TypeBase {
-        public static int create(out SignedPreKeyRecord pre_key, uint32 id, uint64 timestamp, ECKeyPair key_pair, uint8[] signature);
-        [CCode (instance_pos = 2)]
-        public int serialze(out Buffer buffer);
-
-        public uint32 id { get; }
-        public uint64 timestamp { get; }
-        public ECKeyPair key_pair { get; }
-        public uint8[] signature { [CCode (cname = "session_signed_pre_key_get_signature_")] get { int x = (int)get_signature_len(); unowned uint8[] res = get_signature(); res.length = x; return res; } }
-
-        [CCode (array_length = false, cname = "session_signed_pre_key_get_signature")]
-        private unowned uint8[] get_signature();
-        private size_t get_signature_len();
-    }
-
-    /**
-     * Address of an Signal Protocol message recipient
-     */
-    [Compact]
-    [CCode (cname = "signal_protocol_address", cprefix = "signal_protocol_address_", cheader_filename = "signal/signal_protocol.h,signal_helper.h")]
-    public class Address {
-        public Address(string name, int32 device_id);
-        public int32 device_id { get; set; }
-        public string name { owned get; set; }
-    }
-
-    /**
-     * A representation of a (group + sender + device) tuple
-     */
-    [Compact]
-    [CCode (cname = "signal_protocol_sender_key_name")]
-    public class SenderKeyName {
-        [CCode (cname = "group_id", array_length_cname="group_id_len")]
-        private char* group_id_;
-        private size_t group_id_len;
-        public Address sender;
-    }
-
-    [Compact]
-    [CCode (cname = "ec_public_key", cprefix = "ec_public_key_", cheader_filename = "signal/curve.h,signal_helper.h")]
-    public class ECPublicKey : TypeBase {
-        [CCode (cname = "curve_generate_public_key")]
-        public static int generate(out ECPublicKey public_key, ECPrivateKey private_key);
-        [CCode (instance_pos = 1, cname = "ec_public_key_serialize")]
-        private int serialize_([CCode (pos = 0)] out Buffer buffer);
-        [CCode (cname = "ec_public_key_serialize_")]
-        public uint8[] serialize() {
-            Buffer buffer;
-            int code = serialize_(out buffer);
-            if (code < 0 && code > MIN_ERROR_CODE) {
-                // Can only throw for invalid arguments or out of memory.
-                GLib.assert_not_reached();
-            }
-            return buffer.data;
-        }
-        public int compare(ECPublicKey other);
-        public int memcmp(ECPublicKey other);
-    }
-
-    [Compact]
-    [CCode (cname = "ec_private_key", cprefix = "ec_private_key_", cheader_filename = "signal/curve.h,signal_helper.h")]
-    public class ECPrivateKey : TypeBase {
-        [CCode (instance_pos = 1, cname = "ec_private_key_serialize")]
-        private int serialize_([CCode (pos = 0)] out Buffer buffer);
-        [CCode (cname = "ec_private_key_serialize_")]
-        public uint8[] serialize() throws GLib.Error {
-            Buffer buffer;
-            int code = serialize_(out buffer);
-            if (code < 0 && code > MIN_ERROR_CODE) {
-                // Can only throw for invalid arguments or out of memory.
-                GLib.assert_not_reached();
-            }
-            return buffer.data;
-        }
-        public int compare(ECPublicKey other);
-    }
-
-    [Compact]
-    [CCode (cname = "ec_key_pair", cprefix="ec_key_pair_", cheader_filename = "signal/curve.h,signal_helper.h")]
-    public class ECKeyPair : TypeBase {
-        public static int create(out ECKeyPair key_pair, ECPublicKey public_key, ECPrivateKey private_key);
-        public ECPublicKey public { get; }
-        public ECPrivateKey private { get; }
-    }
-
-    [CCode (cname = "ratchet_message_keys", cheader_filename = "signal/ratchet.h")]
-    public class MessageKeys {
-    }
-
-    [Compact]
-    [CCode (cname = "ratchet_identity_key_pair", cprefix = "ratchet_identity_key_pair_", cheader_filename = "signal/ratchet.h,signal_helper.h")]
-    public class IdentityKeyPair : TypeBase {
-        public static int create(out IdentityKeyPair key_pair, ECPublicKey public_key, ECPrivateKey private_key);
-        public int serialze(out Buffer buffer);
-        public ECPublicKey public { get; }
-        public ECPrivateKey private { get; }
-    }
-
-    [Compact]
-    [CCode (cname = "ec_public_key_list")]
-    public class PublicKeyList {}
-
-    /**
-     * The main entry point for Signal Protocol encrypt/decrypt operations.
-     *
-     * Once a session has been established with session_builder,
-     * this class can be used for all encrypt/decrypt operations within
-     * that session.
-     */
-    [Compact]
-    [CCode (cname = "session_cipher", cprefix = "session_cipher_", cheader_filename = "signal/session_cipher.h", free_function = "session_cipher_free")]
-    public class SessionCipher {
-        public void* user_data { get; set; }
-        public DecryptionCallback decryption_callback { set; }
-        [CCode (cname = "session_cipher_encrypt")]
-        private int encrypt_(uint8[] padded_message, out CiphertextMessage encrypted_message);
-        [CCode (cname = "session_cipher_encrypt_")]
-        public CiphertextMessage encrypt(uint8[] padded_message) throws GLib.Error {
-            CiphertextMessage res;
-            throw_by_code(encrypt_(padded_message, out res));
-            return res;
-        }
-        [CCode (cname = "session_cipher_decrypt_pre_key_signal_message")]
-        private int decrypt_pre_key_signal_message_(PreKeySignalMessage ciphertext, void* decrypt_context, out Buffer plaintext);
-        [CCode (cname = "session_cipher_decrypt_pre_key_signal_message_")]
-        public uint8[] decrypt_pre_key_signal_message(PreKeySignalMessage ciphertext, void* decrypt_context = null) throws GLib.Error {
-            Buffer res;
-            throw_by_code(decrypt_pre_key_signal_message_(ciphertext, decrypt_context, out res));
-            return res.data;
-        }
-        [CCode (cname = "session_cipher_decrypt_signal_message")]
-        private int decrypt_signal_message_(SignalMessage ciphertext, void* decrypt_context, out Buffer plaintext);
-        [CCode (cname = "session_cipher_decrypt_signal_message_")]
-        public uint8[] decrypt_signal_message(SignalMessage ciphertext, void* decrypt_context = null) throws GLib.Error {
-            Buffer res;
-            throw_by_code(decrypt_signal_message_(ciphertext, decrypt_context, out res));
-            return res.data;
-        }
-        public int get_remote_registration_id(out uint32 remote_id);
-        public int get_session_version(uint32 version);
-
-        [CCode (has_target = false)]
-        public delegate int DecryptionCallback(SessionCipher cipher, Buffer plaintext, void* decrypt_context);
-    }
-
-    [CCode (cname = "int", cheader_filename = "signal/protocol.h", has_type_id = false)]
-    public enum CiphertextType {
-        [CCode (cname = "CIPHERTEXT_SIGNAL_TYPE")]
-        SIGNAL,
-        [CCode (cname = "CIPHERTEXT_PREKEY_TYPE")]
-        PREKEY,
-        [CCode (cname = "CIPHERTEXT_SENDERKEY_TYPE")]
-        SENDERKEY,
-        [CCode (cname = "CIPHERTEXT_SENDERKEY_DISTRIBUTION_TYPE")]
-        SENDERKEY_DISTRIBUTION
-    }
-
-    [Compact]
-    [CCode (cname = "ciphertext_message", cprefix = "ciphertext_message_", cheader_filename = "signal/protocol.h,signal_helper.h")]
-    public abstract class CiphertextMessage : TypeBase {
-        public CiphertextType type { get; }
-        [CCode (cname = "ciphertext_message_get_serialized")]
-        private unowned Buffer get_serialized_();
-        public uint8[] serialized { [CCode (cname = "ciphertext_message_get_serialized_")] get {
-            return get_serialized_().data;
-        }}
-    }
-    [Compact]
-    [CCode (cname = "signal_message", cprefix = "signal_message_", cheader_filename = "signal/protocol.h,signal_helper.h")]
-    public class SignalMessage : CiphertextMessage {
-        public ECPublicKey sender_ratchet_key { get; }
-        public uint8 message_version { get; }
-        public uint32 counter { get; }
-        public Buffer body { get; }
-        //public int verify_mac(uint8 message_version, ECPublicKey sender_identity_key, ECPublicKey receiver_identity_key, uint8[] mac, NativeContext global_context);
-        public static int is_legacy(uint8[] data);
-    }
-    [Compact]
-    [CCode (cname = "pre_key_signal_message", cprefix = "pre_key_signal_message_", cheader_filename = "signal/protocol.h,signal_helper.h")]
-    public class PreKeySignalMessage : CiphertextMessage {
-        public uint8 message_version { get; }
-        public ECPublicKey identity_key { get; }
-        public uint32 registration_id { get; }
-        public uint32 pre_key_id { get; }
-        public uint32 signed_pre_key_id { get; }
-        public ECPublicKey base_key { get; }
-        public SignalMessage signal_message { get; }
-    }
-    [Compact]
-    [CCode (cname = "sender_key_message", cprefix = "sender_key_message_", cheader_filename = "signal/protocol.h,signal_helper.h")]
-    public class SenderKeyMessage : CiphertextMessage {
-        public uint32 key_id { get; }
-        public uint32 iteration { get; }
-        public Buffer ciphertext { get; }
-    }
-    [Compact]
-    [CCode (cname = "sender_key_distribution_message", cprefix = "sender_key_distribution_message_", cheader_filename = "signal/protocol.h,signal_helper.h")]
-    public class SenderKeyDistributionMessage : CiphertextMessage {
-        public uint32 id { get; }
-        public uint32 iteration { get; }
-        public Buffer chain_key { get; }
-        public ECPublicKey signature_key { get; }
-    }
-
-    [CCode (cname = "signal_vala_encrypt", cheader_filename = "signal_helper.h")]
-    private static int aes_encrypt_(out Buffer output, int cipher, uint8[] key, uint8[] iv, uint8[] plaintext, void *user_data);
-
-    [CCode (cname = "signal_vala_encrypt_")]
-    public uint8[] aes_encrypt(int cipher, uint8[] key, uint8[] iv, uint8[] plaintext) throws GLib.Error {
-        Buffer buf;
-        throw_by_code(aes_encrypt_(out buf, cipher, key, iv, plaintext, null));
-        return buf.data;
-    }
-
-    [CCode (cname = "signal_vala_decrypt", cheader_filename = "signal_helper.h")]
-    private static int aes_decrypt_(out Buffer output, int cipher, uint8[] key, uint8[] iv, uint8[] ciphertext, void *user_data);
-
-    [CCode (cname = "signal_vala_decrypt_")]
-    public uint8[] aes_decrypt(int cipher, uint8[] key, uint8[] iv, uint8[] ciphertext) throws GLib.Error {
-        Buffer buf;
-        throw_by_code(aes_decrypt_(out buf, cipher, key, iv, ciphertext, null));
-        return buf.data;
-    }
-}