diff --git a/src/libs/dialog.cpp b/src/libs/dialog.cpp
index 2b8fb45..7f657b5 100644
--- a/src/libs/dialog.cpp
+++ b/src/libs/dialog.cpp
@@ -199,6 +199,114 @@ void KYTY_SYSV_ABI LoginDialogParamInitialize(void* param) {
 
 } // namespace LoginDialog
 
+namespace SigninDialog {
+
+LIB_NAME("SigninDialog", "SigninDialog");
+
+constexpr int SIGNIN_STATUS_NONE          = 0;
+constexpr int SIGNIN_STATUS_INITIALIZED   = 1;
+constexpr int SIGNIN_STATUS_RUNNING       = 2;
+constexpr int SIGNIN_STATUS_FINISHED      = 3;
+constexpr int SIGNIN_RESULT_USER_CANCELED = 1;
+
+constexpr int SIGNIN_ERROR_NOT_INITIALIZED     = static_cast<int>(0x81350001u);
+constexpr int SIGNIN_ERROR_ALREADY_INITIALIZED = static_cast<int>(0x81350002u);
+constexpr int SIGNIN_ERROR_PARAM_INVALID       = static_cast<int>(0x81350003u);
+constexpr int SIGNIN_ERROR_INVALID_STATE       = static_cast<int>(0x81350005u);
+
+struct SigninDialogResult {
+	int32_t result;
+	int32_t reserved[3];
+};
+
+struct SigninDialogParam {
+	int32_t size;
+	int32_t user_id;
+	int32_t reserved[2];
+};
+
+static_assert(sizeof(SigninDialogResult) == 16);
+static_assert(sizeof(SigninDialogParam) == 16);
+
+static int g_signin_status = SIGNIN_STATUS_NONE;
+
+int KYTY_SYSV_ABI SigninDialogInitialize() {
+	PRINT_NAME();
+	if (g_signin_status != SIGNIN_STATUS_NONE) {
+		return SIGNIN_ERROR_ALREADY_INITIALIZED;
+	}
+	g_signin_status = SIGNIN_STATUS_INITIALIZED;
+	return OK;
+}
+
+int KYTY_SYSV_ABI SigninDialogTerminate() {
+	PRINT_NAME();
+	if (g_signin_status == SIGNIN_STATUS_NONE) {
+		return SIGNIN_ERROR_NOT_INITIALIZED;
+	}
+	g_signin_status = SIGNIN_STATUS_NONE;
+	return OK;
+}
+
+int KYTY_SYSV_ABI SigninDialogOpen(const void* param) {
+	PRINT_NAME();
+	if (g_signin_status != SIGNIN_STATUS_INITIALIZED && g_signin_status != SIGNIN_STATUS_FINISHED) {
+		return SIGNIN_ERROR_INVALID_STATE;
+	}
+	if (param == nullptr ||
+	    static_cast<const SigninDialogParam*>(param)->size != sizeof(SigninDialogParam)) {
+		return SIGNIN_ERROR_PARAM_INVALID;
+	}
+	g_signin_status = SIGNIN_STATUS_RUNNING;
+	return OK;
+}
+
+int KYTY_SYSV_ABI SigninDialogClose() {
+	PRINT_NAME();
+	if (g_signin_status == SIGNIN_STATUS_NONE) {
+		return SIGNIN_ERROR_NOT_INITIALIZED;
+	}
+	if (g_signin_status != SIGNIN_STATUS_RUNNING && g_signin_status != SIGNIN_STATUS_FINISHED) {
+		return SIGNIN_ERROR_INVALID_STATE;
+	}
+	g_signin_status = SIGNIN_STATUS_FINISHED;
+	return OK;
+}
+
+int KYTY_SYSV_ABI SigninDialogUpdateStatus() {
+	PRINT_NAME();
+	if (g_signin_status == SIGNIN_STATUS_RUNNING) {
+		g_signin_status = SIGNIN_STATUS_FINISHED;
+	}
+	return g_signin_status;
+}
+
+int KYTY_SYSV_ABI SigninDialogGetStatus() {
+	PRINT_NAME();
+	return g_signin_status;
+}
+
+int KYTY_SYSV_ABI SigninDialogGetResult(void* result) {
+	PRINT_NAME();
+	if (g_signin_status == SIGNIN_STATUS_NONE) {
+		return SIGNIN_ERROR_NOT_INITIALIZED;
+	}
+	if (g_signin_status != SIGNIN_STATUS_FINISHED) {
+		return SIGNIN_ERROR_INVALID_STATE;
+	}
+	if (result == nullptr) {
+		return SIGNIN_ERROR_PARAM_INVALID;
+	}
+	auto* r        = static_cast<SigninDialogResult*>(result);
+	r->result      = SIGNIN_RESULT_USER_CANCELED;
+	r->reserved[0] = 0;
+	r->reserved[1] = 0;
+	r->reserved[2] = 0;
+	return OK;
+}
+
+} // namespace SigninDialog
+
 namespace SaveDataDialog {
 
 LIB_NAME("SaveDataDialog", "SaveDataDialog");
diff --git a/src/libs/dialog.h b/src/libs/dialog.h
index c1a8976..b187ae6 100644
--- a/src/libs/dialog.h
+++ b/src/libs/dialog.h
@@ -31,6 +31,18 @@ void KYTY_SYSV_ABI LoginDialogParamInitialize(void* param);
 
 } // namespace LoginDialog
 
+namespace SigninDialog {
+
+int KYTY_SYSV_ABI SigninDialogInitialize();
+int KYTY_SYSV_ABI SigninDialogTerminate();
+int KYTY_SYSV_ABI SigninDialogOpen(const void* param);
+int KYTY_SYSV_ABI SigninDialogClose();
+int KYTY_SYSV_ABI SigninDialogUpdateStatus();
+int KYTY_SYSV_ABI SigninDialogGetStatus();
+int KYTY_SYSV_ABI SigninDialogGetResult(void* result);
+
+} // namespace SigninDialog
+
 namespace SaveDataDialog {
 
 int KYTY_SYSV_ABI SaveDataDialogInitialize();
diff --git a/src/libs/libDialog.cpp b/src/libs/libDialog.cpp
index a27bd5a..32a1057 100644
--- a/src/libs/libDialog.cpp
+++ b/src/libs/libDialog.cpp
@@ -48,6 +48,24 @@ LIB_DEFINE(InitDialog_1_LoginDialog) {
 
 } // namespace LibLoginDialog
 
+namespace LibSigninDialog {
+
+LIB_VERSION("SigninDialog", 1, "SigninDialog", 1, 1);
+
+namespace SigninDialog = Dialog::SigninDialog;
+
+LIB_DEFINE(InitDialog_1_SigninDialog) {
+	LIB_FUNC("mlYGfmqE3fQ", SigninDialog::SigninDialogInitialize);
+	LIB_FUNC("LXlmS6PvJdU", SigninDialog::SigninDialogTerminate);
+	LIB_FUNC("JlpJVoRWv7U", SigninDialog::SigninDialogOpen);
+	LIB_FUNC("M3OkENHcyiU", SigninDialog::SigninDialogClose);
+	LIB_FUNC("Bw31liTFT3A", SigninDialog::SigninDialogUpdateStatus);
+	LIB_FUNC("2m077aeC+PA", SigninDialog::SigninDialogGetStatus);
+	LIB_FUNC("nqG7rqnYw1U", SigninDialog::SigninDialogGetResult);
+}
+
+} // namespace LibSigninDialog
+
 namespace LibSaveDataDialog {
 
 LIB_VERSION("SaveDataDialog", 1, "SaveDataDialog", 1, 1);
@@ -127,6 +145,7 @@ LIB_DEFINE(InitDialog_1) {
 	LibCommonDialog::InitDialog_1_CommonDialog(s);
 	LibImeDialog::InitDialog_1_ImeDialog(s);
 	LibLoginDialog::InitDialog_1_LoginDialog(s);
+	LibSigninDialog::InitDialog_1_SigninDialog(s);
 	LibSaveDataDialog::InitDialog_1_SaveDataDialog(s);
 	LibSaveDataDialogNative::InitDialog_1_SaveDataDialogNative(s);
 	LibMsgDialog::InitDialog_1_MsgDialog(s);