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diff --git a/lib/keyslot_context.h b/lib/keyslot_context.h
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+/*
+ * LUKS - Linux Unified Key Setup, keyslot unlock helpers
+ *
+ * Copyright (C) 2022-2023 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2022-2023 Ondrej Kozina
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef KEYSLOT_CONTEXT_H
+#define KEYSLOT_CONTEXT_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "internal.h"
+
+typedef int (*keyslot_context_get_key) (
+ struct crypt_device *cd,
+ struct crypt_keyslot_context *kc,
+ int keyslot,
+ int segment,
+ struct volume_key **r_vk);
+
+typedef int (*keyslot_context_get_volume_key) (
+ struct crypt_device *cd,
+ struct crypt_keyslot_context *kc,
+ int keyslot,
+ struct volume_key **r_vk);
+
+typedef int (*keyslot_context_get_passphrase) (
+ struct crypt_device *cd,
+ struct crypt_keyslot_context *kc,
+ const char **r_passphrase,
+ size_t *r_passphrase_size);
+
+/* crypt_keyslot_context */
+struct crypt_keyslot_context {
+ int type;
+
+ union {
+ struct {
+ const char *passphrase;
+ size_t passphrase_size;
+ } p;
+ struct {
+ const char *keyfile;
+ uint64_t keyfile_offset;
+ size_t keyfile_size;
+ } kf;
+ struct {
+ int id;
+ const char *type;
+ const char *pin;
+ size_t pin_size;
+ void *usrptr;
+ } t;
+ struct {
+ const char *volume_key;
+ size_t volume_key_size;
+ } k;
+ } u;
+
+ int error;
+
+ char *i_passphrase;
+ size_t i_passphrase_size;
+
+ keyslot_context_get_key get_luks2_key;
+ keyslot_context_get_volume_key get_luks1_volume_key;
+ keyslot_context_get_volume_key get_luks2_volume_key;
+ keyslot_context_get_passphrase get_passphrase;
+};
+
+void crypt_keyslot_context_destroy_internal(struct crypt_keyslot_context *method);
+
+void crypt_keyslot_unlock_by_key_init_internal(struct crypt_keyslot_context *kc,
+ const char *volume_key,
+ size_t volume_key_size);
+
+void crypt_keyslot_unlock_by_passphrase_init_internal(struct crypt_keyslot_context *kc,
+ const char *passphrase,
+ size_t passphrase_size);
+
+void crypt_keyslot_unlock_by_keyfile_init_internal(struct crypt_keyslot_context *kc,
+ const char *keyfile,
+ size_t keyfile_size,
+ uint64_t keyfile_offset);
+
+void crypt_keyslot_unlock_by_token_init_internal(struct crypt_keyslot_context *kc,
+ int token,
+ const char *type,
+ const char *pin,
+ size_t pin_size,
+ void *usrptr);
+
+const char *keyslot_context_type_string(const struct crypt_keyslot_context *kc);
+
+#endif /* KEYSLOT_CONTEXT_H */