Update nitrokey crate to 0.4.0-alpha.3

This change updates the version of the nitrokey crate that we use to
0.4.0-alpha.3. This version is the supposedly last pre-release before
0.4.0, with no further major anticipated changes.
In order to integrate with this new version we have to adjust the way we
connect to a Nitrokey device by funneling those connection requests
through a global manager object. The rationale behind that step being
that the underlying libnitrokey actually cannot handle access of
multiple devices at the same time, and so the manager object is used to
prevent accidental wrong concurrent usage.
Because a device object now effectively keeps a reference to the
manager, we need to provide an additional lifetime to that and derived
objects.
Lastly, the use of a manager is also the reason why the tests had to be
adjusted to no longer accept device objects in their signatures, but
only the respective model for which to invoke the test. That is required
because, as elaborated earlier on, having a device object implies having
taken a reference to a manager (in that case owned by nitrokey-test),
and that reference clashes with the nitrocli code itself attempting to
take the manager. We side step this problem by merely accepting a Model
object, which can be passed around independently of the manager itself,
meaning that nitrokey-test does not need to hold such a reference while
the test is run.

Import subrepo nitrokey/:nitrokey at f150d59410eefdec2ae69b2422906a3d1d88aa07
Import subrepo nitrokey-sys/:nitrokey-sys at 8695e2c762807e033a86c8d03974b686d20cdd72
Import subrepo lazy-static/:lazy-static at b4b2b16aaa79dd7548e288455a0dbe4065bf4e1a

1 files changed, 1014 insertions, 0 deletions

diff --git a/nitrokey-sys/libnitrokey-v3.5/NK_C_API.h b/nitrokey-sys/libnitrokey-v3.5/NK_C_API.h
new file mode 100644
index 0000000..d5c54a3
--- /dev/null
+++ b/nitrokey-sys/libnitrokey-v3.5/NK_C_API.h
@@ -0,0 +1,1014 @@
+/*
+ * Copyright (c) 2015-2018 Nitrokey UG
+ *
+ * This file is part of libnitrokey.
+ *
+ * libnitrokey is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * any later version.
+ *
+ * libnitrokey 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 Lesser General Public License
+ * along with libnitrokey. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: LGPL-3.0
+ */
+
+#ifndef LIBNITROKEY_NK_C_API_H
+#define LIBNITROKEY_NK_C_API_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "deprecated.h"
+
+#ifdef _MSC_VER
+#define NK_C_API __declspec(dllexport)
+#else
+#define NK_C_API
+#endif
+
+/**
+ * \file
+ *
+ * C API for libnitrokey
+ *
+ * \mainpage
+ *
+ * **libnitrokey** provides access to Nitrokey Pro and Nitrokey Storage devices.
+ * This documentation describes libnitrokey’s C API.  For a list of the
+ * available functions, see the NK_C_API.h file.
+ *
+ * \section getting_started Example
+ *
+ * \code{.c}
+ * #include <stdio.h>
+ * #include <stdlib.h>
+ * #include <libnitrokey/NK_C_API.h>
+ *
+ * int main(void)
+ * {
+ *         if (NK_login_auto() != 1) {
+ *                 fprintf(stderr, "No Nitrokey found.\n");
+ *                 return 1;
+ *         }
+ *
+ *         NK_device_model model = NK_get_device_model();
+ *         printf("Connected to ");
+ *         switch (model) {
+ *         case NK_PRO:
+ *                 printf("a Nitrokey Pro");
+ *                 break;
+ *         case NK_STORAGE:
+ *                 printf("a Nitrokey Storage");
+ *                 break;
+ *         default:
+ *                 printf("an unsupported Nitrokey");
+ *                 break;
+ *         }
+ *
+ *         char* serial_number = NK_device_serial_number();
+ *         if (serial_number)
+ *             printf(" with serial number %s\n", serial_number);
+ *         else
+ *             printf(" -- could not query serial number!\n");
+ *         free(serial_number);
+ *
+ *         NK_logout();
+ *         return 0;
+ * }
+ * \endcode
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+  /**
+   * The number of slots in the password safe.
+   */
+  extern const uint8_t NK_PWS_SLOT_COUNT;
+
+  static const int MAXIMUM_STR_REPLY_LENGTH = 8192;
+
+        /**
+         * The Nitrokey device models supported by the API.
+         */
+        enum NK_device_model {
+						/**
+						 * Use, if no supported device is connected
+						 */
+        		NK_DISCONNECTED = 0,
+            /**
+             * Nitrokey Pro.
+             */
+            NK_PRO = 1,
+            /**
+             * Nitrokey Storage.
+             */
+            NK_STORAGE = 2
+        };
+
+        /**
+	 * The connection info for a Nitrokey device as a linked list.
+	 */
+	struct NK_device_info {
+		/**
+		 * The model of the Nitrokey device.
+		 */
+		enum NK_device_model model;
+		/**
+		 * The USB device path for NK_connect_with_path.
+		 */
+		char* path;
+		/**
+		 * The serial number.
+		 */
+		char* serial_number;
+		/**
+		 * The pointer to the next element of the linked list or null
+		 * if this is the last element in the list.
+		 */
+		struct NK_device_info* next;
+	};
+
+	/**
+	 * Stores the common device status for all Nitrokey devices.
+	 */
+	struct NK_status {
+		/**
+		 * The major firmware version, e. g. 0 in v0.40.
+		 */
+		uint8_t firmware_version_major;
+		/**
+		 * The minor firmware version, e. g. 40 in v0.40.
+		 */
+		uint8_t firmware_version_minor;
+		/**
+		 * The serial number of the smart card.
+		 */
+		uint32_t serial_number_smart_card;
+		/**
+		 * The HOTP slot to generate a password from if the numlock
+		 * key is pressed twice (slot 0-1, or any other value to
+		 * disable the function).
+		 */
+		uint8_t config_numlock;
+		/**
+		 * The HOTP slot to generate a password from if the capslock
+		 * key is pressed twice (slot 0-1, or any other value to
+		 * disable the function).
+		 */
+		uint8_t config_capslock;
+		/**
+		 * The HOTP slot to generate a password from if the scrolllock
+		 * key is pressed twice (slot 0-1, or any other value to
+		 * disable the function).
+		 */
+		uint8_t config_scrolllock;
+		/**
+		 * Indicates whether the user password is required to generate
+		 * an OTP value.
+		 */
+		bool otp_user_password;
+	};
+
+	/**
+	 * Stores the status of a Storage device.
+	 */
+        struct NK_storage_status {
+		/**
+		 * Indicates whether the unencrypted volume is read-only.
+		 */
+		bool unencrypted_volume_read_only;
+		/**
+		 * Indicates whether the unencrypted volume is active.
+		 */
+		bool unencrypted_volume_active;
+		/**
+		 * Indicates whether the encrypted volume is read-only.
+		 */
+		bool encrypted_volume_read_only;
+		/**
+		 * Indicates whether the encrypted volume is active.
+		 */
+		bool encrypted_volume_active;
+		/**
+		 * Indicates whether the hidden volume is read-only.
+		 */
+		bool hidden_volume_read_only;
+		/**
+		 * Indicates whether the hidden volume is active.
+		 */
+		bool hidden_volume_active;
+		/**
+		 * The major firmware version, e. g. 0 in v0.40.
+		 */
+		uint8_t firmware_version_major;
+		/**
+		 * The minor firmware version, e. g. 40 in v0.40.
+		 */
+		uint8_t firmware_version_minor;
+		/**
+		 * Indicates whether the firmware is locked.
+		 */
+		bool firmware_locked;
+		/**
+		 * The serial number of the SD card in the Storage stick.
+		 */
+		uint32_t serial_number_sd_card;
+		/**
+		 * The serial number of the smart card in the Storage stick.
+		 */
+		uint32_t serial_number_smart_card;
+		/**
+		 * The number of remaining login attempts for the user PIN.
+		 */
+		uint8_t user_retry_count;
+		/**
+		 * The number of remaining login attempts for the admin PIN.
+		 */
+		uint8_t admin_retry_count;
+		/**
+		 * Indicates whether a new SD card was found.
+		 */
+		bool new_sd_card_found;
+		/**
+		 * Indicates whether the SD card is filled with random characters.
+		 */
+		bool filled_with_random;
+		/**
+		 * Indicates whether the stick has been initialized by generating
+		 * the AES keys.
+		 */
+		bool stick_initialized;
+        };
+
+	/**
+	 * Data about the usage of the SD card.
+	 */
+	struct NK_SD_usage_data {
+		/**
+		 * The minimum write level, as a percentage of the total card
+		 * size.
+		 */
+		uint8_t write_level_min;
+		/**
+		 * The maximum write level, as a percentage of the total card
+		 * size.
+		 */
+		uint8_t write_level_max;
+	};
+
+
+   struct NK_storage_ProductionTest{
+    uint8_t FirmwareVersion_au8[2];
+    uint8_t FirmwareVersionInternal_u8;
+    uint8_t SD_Card_Size_u8;
+    uint32_t CPU_CardID_u32;
+    uint32_t SmartCardID_u32;
+    uint32_t SD_CardID_u32;
+    uint8_t SC_UserPwRetryCount;
+    uint8_t SC_AdminPwRetryCount;
+    uint8_t SD_Card_ManufacturingYear_u8;
+    uint8_t SD_Card_ManufacturingMonth_u8;
+    uint16_t SD_Card_OEM_u16;
+    uint16_t SD_WriteSpeed_u16;
+    uint8_t SD_Card_Manufacturer_u8;
+  };
+
+  NK_C_API int NK_get_storage_production_info(struct NK_storage_ProductionTest * out);
+
+
+/**
+ * Set debug level of messages written on stderr
+ * @param state state=True - most messages, state=False - only errors level
+ */
+	NK_C_API void NK_set_debug(bool state);
+
+	/**
+	 * Set debug level of messages written on stderr
+	 * @param level (int) 0-lowest verbosity, 5-highest verbosity
+	 */
+	NK_C_API void NK_set_debug_level(const int level);
+
+	/**
+	 * Get the major library version, e. g. the 3 in v3.2.
+	 * @return the major library version
+	 */
+	NK_C_API unsigned int NK_get_major_library_version();
+
+	/**
+	 * Get the minor library version, e. g. the 2 in v3.2.
+	 * @return the minor library version
+	 */
+	NK_C_API unsigned int NK_get_minor_library_version();
+
+	/**
+	 * Get the library version as a string.  This is the output of
+	 * `git describe --always` at compile time, for example "v3.3" or
+	 * "v3.3-19-gaee920b".
+	 * The return value is a string literal and must not be freed.
+	 * @return the library version as a string
+	 */
+	NK_C_API const char* NK_get_library_version();
+
+	/**
+	 * Connect to device of given model. Currently library can be connected only to one device at once.
+	 * @param device_model char 'S': Nitrokey Storage, 'P': Nitrokey Pro
+	 * @return 1 if connected, 0 if wrong model or cannot connect
+	 */
+	NK_C_API int NK_login(const char *device_model);
+
+	/**
+	 * Connect to device of given model. Currently library can be connected only to one device at once.
+	 * @param device_model NK_device_model: NK_PRO: Nitrokey Pro, NK_STORAGE: Nitrokey Storage
+	 * @return 1 if connected, 0 if wrong model or cannot connect
+	 */
+        NK_C_API int NK_login_enum(enum NK_device_model device_model);
+
+	/**
+	 * Connect to first available device, starting checking from Pro 1st to Storage 2nd.
+	 * @return 1 if connected, 0 if wrong model or cannot connect
+	 */
+	NK_C_API int NK_login_auto();
+
+	/**
+	 * Disconnect from the device.
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_logout();
+
+	/**
+	 * Query the model of the connected device.
+	 * Returns the model of the connected device or NK_DISCONNECTED.
+	 *
+	 * @return true if a device is connected and the out argument has been set
+	 */
+	NK_C_API enum NK_device_model NK_get_device_model();
+
+	/**
+	 * Return the debug status string. Debug purposes.  This function is
+	 * deprecated in favor of NK_get_status_as_string.
+	 * @return string representation of the status or an empty string
+	 *         if the command failed
+	 */
+	DEPRECATED
+	NK_C_API char * NK_status();
+
+	/**
+	 * Return the debug status string. Debug purposes.
+	 * @return string representation of the status or an empty string
+	 *         if the command failed
+	 */
+	NK_C_API char * NK_get_status_as_string();
+
+	/**
+	 * Get the stick status common to all Nitrokey devices and return the
+	 * command processing error code.  If the code is zero, i. e. the
+	 * command was successful, the storage status is written to the output
+	 * pointer's target.  The output pointer must not be null.
+	 *
+	 * @param out the output pointer for the status
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_get_status(struct NK_status* out);
+
+	/**
+	 * Return the device's serial number string in hex.
+	 * @return string device's serial number in hex
+	 */
+	NK_C_API char * NK_device_serial_number();
+
+	/**
+	 * Get last command processing status. Useful for commands which returns the results of their own and could not return
+	 * an error code.
+	 * @return previous command processing error code
+	 */
+	NK_C_API uint8_t NK_get_last_command_status();
+
+	/**
+	 * Lock device - cancel any user device unlocking.
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_lock_device();
+
+	/**
+	 * Authenticates the user on USER privilages with user_password and sets user's temporary password on device to user_temporary_password.
+	 * @param user_password char[25] current user password
+	 * @param user_temporary_password char[25] user temporary password to be set on device for further communication (authentication command)
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_user_authenticate(const char* user_password, const char* user_temporary_password);
+
+	/**
+	 * Authenticates the user on ADMIN privilages with admin_password and sets user's temporary password on device to admin_temporary_password.
+	 * @param admin_password char[25] current administrator PIN
+	 * @param admin_temporary_password char[25] admin temporary password to be set on device for further communication (authentication command)
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_first_authenticate(const char* admin_password, const char* admin_temporary_password);
+
+	/**
+	 * Execute a factory reset.
+	 * @param admin_password char[20] current administrator PIN
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_factory_reset(const char* admin_password);
+
+	/**
+	 * Generates AES key on the device
+	 * @param admin_password char[20] current administrator PIN
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_build_aes_key(const char* admin_password);
+
+	/**
+	 * Unlock user PIN locked after 3 incorrect codes tries.
+	 * @param admin_password char[20] current administrator PIN
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_unlock_user_password(const char *admin_password, const char *new_user_password);
+
+	/**
+	 * Write general config to the device
+	 * @param numlock set value in range [0-1] to send HOTP code from slot 'numlock' after double pressing numlock
+	 * or outside the range to disable this function
+	 * @param capslock similar to numlock but with capslock
+	 * @param scrolllock similar to numlock but with scrolllock
+	 * @param enable_user_password set True to enable OTP PIN protection (require PIN each OTP code request)
+	 * @param delete_user_password (unused)
+	 * @param admin_temporary_password current admin temporary password
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_write_config(uint8_t numlock, uint8_t capslock, uint8_t scrolllock,
+		bool enable_user_password, bool delete_user_password, const char *admin_temporary_password);
+
+	/**
+	 * Get currently set config - status of function Numlock/Capslock/Scrollock OTP sending and is enabled PIN protected OTP
+	 * @see NK_write_config
+	 * @return  uint8_t general_config[5]:
+	 *            uint8_t numlock;
+				  uint8_t capslock;
+				  uint8_t scrolllock;
+				  uint8_t enable_user_password;
+				  uint8_t delete_user_password;
+
+	 */
+	NK_C_API uint8_t* NK_read_config();
+
+	//OTP
+
+	/**
+	 * Get name of given TOTP slot
+	 * @param slot_number TOTP slot number, slot_number<15
+	 * @return char[20] the name of the slot
+	 */
+	NK_C_API char * NK_get_totp_slot_name(uint8_t slot_number);
+
+	/**
+	 *
+	 * @param slot_number HOTP slot number, slot_number<3
+	 * @return char[20] the name of the slot
+	 */
+	NK_C_API char * NK_get_hotp_slot_name(uint8_t slot_number);
+
+	/**
+	 * Erase HOTP slot data from the device
+	 * @param slot_number HOTP slot number, slot_number<3
+	 * @param temporary_password admin temporary password
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_erase_hotp_slot(uint8_t slot_number, const char *temporary_password);
+
+	/**
+	 * Erase TOTP slot data from the device
+	 * @param slot_number TOTP slot number, slot_number<15
+	 * @param temporary_password admin temporary password
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_erase_totp_slot(uint8_t slot_number, const char *temporary_password);
+
+	/**
+	 * Write HOTP slot data to the device
+	 * @param slot_number HOTP slot number, slot_number<3, 0-numbered
+	 * @param slot_name char[15] desired slot name. C string (requires ending '\0'; 16 bytes).
+	 * @param secret char[40] 160-bit or 320-bit (currently Pro v0.8 only) secret as a hex string. C string (requires ending '\0'; 41 bytes).
+	 * See NitrokeyManager::is_320_OTP_secret_supported.
+	 * @param hotp_counter uint32_t starting value of HOTP counter
+	 * @param use_8_digits should returned codes be 6 (false) or 8 digits (true)
+	 * @param use_enter press ENTER key after sending OTP code using double-pressed scroll/num/capslock
+	 * @param use_tokenID @see token_ID
+	 * @param token_ID @see https://openauthentication.org/token-specs/, 'Class A' section
+	 * @param temporary_password char[25] admin temporary password
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_write_hotp_slot(uint8_t slot_number, const char *slot_name, const char *secret, uint64_t hotp_counter,
+		bool use_8_digits, bool use_enter, bool use_tokenID, const char *token_ID,
+		const char *temporary_password);
+
+	/**
+	 * Write TOTP slot data to the device
+	 * @param slot_number TOTP slot number, slot_number<15, 0-numbered
+	 * @param slot_name char[15] desired slot name. C string (requires ending '\0'; 16 bytes).
+	 * @param secret char[40] 160-bit or 320-bit (currently Pro v0.8 only) secret as a hex string. C string (requires ending '\0'; 41 bytes).
+	 * See NitrokeyManager::is_320_OTP_secret_supported.
+	 * @param time_window uint16_t time window for this TOTP
+	 * @param use_8_digits should returned codes be 6 (false) or 8 digits (true)
+	 * @param use_enter press ENTER key after sending OTP code using double-pressed scroll/num/capslock
+	 * @param use_tokenID @see token_ID
+	 * @param token_ID @see https://openauthentication.org/token-specs/, 'Class A' section
+	 * @param temporary_password char[20] admin temporary password
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_write_totp_slot(uint8_t slot_number, const char *slot_name, const char *secret, uint16_t time_window,
+		bool use_8_digits, bool use_enter, bool use_tokenID, const char *token_ID,
+		const char *temporary_password);
+
+	/**
+	 * Get HOTP code from the device
+	 * @param slot_number HOTP slot number, slot_number<3
+	 * @return HOTP code
+	 */
+	NK_C_API char * NK_get_hotp_code(uint8_t slot_number);
+
+	/**
+	 * Get HOTP code from the device (PIN protected)
+	 * @param slot_number HOTP slot number, slot_number<3
+	 * @param user_temporary_password char[25] user temporary password if PIN protected OTP codes are enabled,
+	 * otherwise should be set to empty string - ''
+	 * @return HOTP code
+	 */
+	NK_C_API char * NK_get_hotp_code_PIN(uint8_t slot_number, const char *user_temporary_password);
+
+	/**
+	 * Get TOTP code from the device
+	 * @param slot_number TOTP slot number, slot_number<15
+	 * @param challenge TOTP challenge -- unused
+	 * @param last_totp_time last time -- unused
+	 * @param last_interval last interval --unused
+	 * @return TOTP code
+	 */
+	NK_C_API char * NK_get_totp_code(uint8_t slot_number, uint64_t challenge, uint64_t last_totp_time,
+		uint8_t last_interval);
+
+	/**
+	 * Get TOTP code from the device (PIN protected)
+	 * @param slot_number TOTP slot number, slot_number<15
+	 * @param challenge TOTP challenge -- unused
+	 * @param last_totp_time last time -- unused
+	 * @param last_interval last interval -- unused
+	 * @param user_temporary_password char[25] user temporary password if PIN protected OTP codes are enabled,
+	 * otherwise should be set to empty string - ''
+	 * @return TOTP code
+	 */
+	NK_C_API char * NK_get_totp_code_PIN(uint8_t slot_number, uint64_t challenge,
+		uint64_t last_totp_time, uint8_t last_interval,
+		const char *user_temporary_password);
+
+	/**
+	 * Set time on the device (for TOTP requests)
+	 * @param time seconds in unix epoch (from 01.01.1970)
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_totp_set_time(uint64_t time);
+
+	/**
+	 * Set the device time used for TOTP to the given time.  Contrary to
+	 * {@code set_time(uint64_t)}, this command fails if {@code old_time}
+	 * &gt; {@code time} or if {@code old_time} is zero (where {@code
+	 * old_time} is the current time on the device).
+	 *
+	 * @param time new device time as Unix timestamp (seconds since
+	 *        1970-01-01)
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_totp_set_time_soft(uint64_t time);
+
+	// NK_totp_get_time is deprecated -- use NK_totp_set_time_soft instead
+	DEPRECATED
+	NK_C_API int NK_totp_get_time();
+
+	//passwords
+	/**
+	 * Change administrator PIN
+	 * @param current_PIN char[25] current PIN
+	 * @param new_PIN char[25] new PIN
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_change_admin_PIN(const char *current_PIN, const char *new_PIN);
+
+	/**
+	 * Change user PIN
+	 * @param current_PIN char[25] current PIN
+	 * @param new_PIN char[25] new PIN
+	 * @return command processing error code
+	*/
+	NK_C_API int NK_change_user_PIN(const char *current_PIN, const char *new_PIN);
+
+
+	/**
+	 * Get retry count of user PIN
+	 * @return user PIN retry count
+	 */
+	NK_C_API uint8_t NK_get_user_retry_count();
+
+	/**
+	 * Get retry count of admin PIN
+	 * @return admin PIN retry count
+	 */
+	NK_C_API uint8_t NK_get_admin_retry_count();
+	//password safe
+
+	/**
+	 * Enable password safe access
+	 * @param user_pin char[30] current user PIN
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_enable_password_safe(const char *user_pin);
+
+	/**
+	 * Get password safe slots' status
+	 * @return uint8_t[16] slot statuses - each byte represents one slot with 0 (not programmed) and 1 (programmed)
+	 */
+	NK_C_API uint8_t * NK_get_password_safe_slot_status();
+
+	/**
+	 * Get password safe slot name
+	 * @param slot_number password safe slot number, slot_number<16
+	 * @return slot name
+	 */
+	NK_C_API char *NK_get_password_safe_slot_name(uint8_t slot_number);
+
+	/**
+	 * Get password safe slot login
+	 * @param slot_number password safe slot number, slot_number<16
+	 * @return login from the PWS slot
+	 */
+	NK_C_API char *NK_get_password_safe_slot_login(uint8_t slot_number);
+
+	/**
+	 * Get the password safe slot password
+	 * @param slot_number password safe slot number, slot_number<16
+	 * @return password from the PWS slot
+	 */
+	NK_C_API char *NK_get_password_safe_slot_password(uint8_t slot_number);
+
+	/**
+	 * Write password safe data to the slot
+	 * @param slot_number password safe slot number, slot_number<16
+	 * @param slot_name char[11] name of the slot
+	 * @param slot_login char[32] login string
+	 * @param slot_password char[20] password string
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_write_password_safe_slot(uint8_t slot_number, const char *slot_name,
+		const char *slot_login, const char *slot_password);
+
+	/**
+	 * Erase the password safe slot from the device
+	 * @param slot_number password safe slot number, slot_number<16
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_erase_password_safe_slot(uint8_t slot_number);
+
+	/**
+	 * Check whether AES is supported by the device
+	 * @return 0 for no and 1 for yes
+	 */
+	NK_C_API int NK_is_AES_supported(const char *user_password);
+
+	/**
+	 * Get device's major firmware version
+	 * @return major part of the version number (e.g. 0 from 0.48, 0 from 0.7 etc.)
+	 */
+	NK_C_API uint8_t NK_get_major_firmware_version();
+
+	/**
+	 * Get device's minor firmware version
+	 * @return minor part of the version number (e.g. 7 from 0.7, 48 from 0.48 etc.)
+	 */
+	NK_C_API uint8_t NK_get_minor_firmware_version();
+
+  /**
+   * Function to determine unencrypted volume PIN type
+   * @param minor_firmware_version
+   * @return Returns 1, if set unencrypted volume ro/rw pin type is User, 0 otherwise.
+   */
+	NK_C_API int NK_set_unencrypted_volume_rorw_pin_type_user();
+
+
+	/**
+	 * This command is typically run to initiate
+	 * communication with the device (altough not required).
+	 * It sets time on device and returns its current status
+	 * - a combination of set_time and get_status_storage commands
+	 * Storage only
+	 * @param seconds_from_epoch date and time expressed in seconds
+	 */
+	NK_C_API int NK_send_startup(uint64_t seconds_from_epoch);
+
+	/**
+	 * Unlock encrypted volume.
+	 * Storage only
+	 * @param user_pin user pin 20 characters
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_unlock_encrypted_volume(const char* user_pin);
+
+	/**
+	 * Locks encrypted volume
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_lock_encrypted_volume();
+
+	/**
+	 * Unlock hidden volume and lock encrypted volume.
+	 * Requires encrypted volume to be unlocked.
+	 * Storage only
+	 * @param hidden_volume_password 20 characters
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_unlock_hidden_volume(const char* hidden_volume_password);
+
+	/**
+	 * Locks hidden volume
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_lock_hidden_volume();
+
+	/**
+	 * Create hidden volume.
+	 * Requires encrypted volume to be unlocked.
+	 * Storage only
+	 * @param slot_nr slot number in range 0-3
+	 * @param start_percent volume begin expressed in percent of total available storage, int in range 0-99
+	 * @param end_percent volume end expressed in percent of total available storage, int in range 1-100
+	 * @param hidden_volume_password 20 characters
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_create_hidden_volume(uint8_t slot_nr, uint8_t start_percent, uint8_t end_percent,
+		const char *hidden_volume_password);
+
+	/**
+	 * Make unencrypted volume read-only.
+	 * Device hides unencrypted volume for a second therefore make sure
+	 * buffers are flushed before running.
+	 * Does nothing if firmware version is not matched
+	 * Firmware range: Storage v0.50, v0.48 and below
+	 * Storage only
+	 * @param user_pin 20 characters User PIN
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_set_unencrypted_read_only(const char *user_pin);
+
+	/**
+	 * Make unencrypted volume read-write.
+	 * Device hides unencrypted volume for a second therefore make sure
+	 * buffers are flushed before running.
+	 * Does nothing if firmware version is not matched
+	 * Firmware range: Storage v0.50, v0.48 and below
+	 * Storage only
+	 * @param user_pin 20 characters User PIN
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_set_unencrypted_read_write(const char *user_pin);
+
+	/**
+	 * Make unencrypted volume read-only.
+	 * Device hides unencrypted volume for a second therefore make sure
+	 * buffers are flushed before running.
+	 * Does nothing if firmware version is not matched
+	 * Firmware range: Storage v0.49, v0.51+
+	 * Storage only
+	 * @param admin_pin 20 characters Admin PIN
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_set_unencrypted_read_only_admin(const char* admin_pin);
+
+	/**
+	 * Make unencrypted volume read-write.
+	 * Device hides unencrypted volume for a second therefore make sure
+	 * buffers are flushed before running.
+	 * Does nothing if firmware version is not matched
+	 * Firmware range: Storage v0.49, v0.51+
+	 * Storage only
+	 * @param admin_pin 20 characters Admin PIN
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_set_unencrypted_read_write_admin(const char* admin_pin);
+
+	/**
+	 * Make encrypted volume read-only.
+	 * Device hides encrypted volume for a second therefore make sure
+	 * buffers are flushed before running.
+	 * Firmware range: v0.49 only, future (see firmware release notes)
+	 * Storage only
+	 * @param admin_pin 20 characters
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_set_encrypted_read_only(const char* admin_pin);
+
+	/**
+	 * Make encrypted volume read-write.
+	 * Device hides encrypted volume for a second therefore make sure
+	 * buffers are flushed before running.
+	 * Firmware range: v0.49 only, future (see firmware release notes)
+	 * Storage only
+	 * @param admin_pin 20 characters
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_set_encrypted_read_write(const char* admin_pin);
+
+	/**
+	 * Exports device's firmware to unencrypted volume.
+	 * Storage only
+	 * @param admin_pin 20 characters
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_export_firmware(const char* admin_pin);
+
+	/**
+	 * Clear new SD card notification. It is set after factory reset.
+	 * Storage only
+	 * @param admin_pin 20 characters
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_clear_new_sd_card_warning(const char* admin_pin);
+
+	/**
+	 * Fill SD card with random data.
+	 * Should be done on first stick initialization after creating keys.
+	 * Storage only
+	 * @param admin_pin 20 characters
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_fill_SD_card_with_random_data(const char* admin_pin);
+
+	/**
+	 * Change update password.
+	 * Update password is used for entering update mode, where firmware
+	 * could be uploaded using dfu-programmer or other means.
+	 * Storage only
+	 * @param current_update_password 20 characters
+	 * @param new_update_password 20 characters
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_change_update_password(const char* current_update_password,
+		const char* new_update_password);
+
+	/**
+	 * Enter update mode. Needs update password.
+	 * When device is in update mode it no longer accepts any HID commands until
+	 * firmware is launched (regardless of being updated or not).
+	 * Smartcard (through CCID interface) and its all volumes are not visible as well.
+	 * Its VID and PID are changed to factory-default (03eb:2ff1 Atmel Corp.)
+	 * to be detected by flashing software. Result of this command can be reversed
+	 * by using 'launch' command.
+	 * For dfu-programmer it would be: 'dfu-programmer at32uc3a3256s launch'.
+	 * Storage only
+	 * @param update_password 20 characters
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_enable_firmware_update(const char* update_password);
+
+	/**
+	 * Get Storage stick status as string.
+	 * Storage only
+	 * @return string with devices attributes
+	 */
+	NK_C_API char* NK_get_status_storage_as_string();
+
+	/**
+	 * Get the Storage stick status and return the command processing
+	 * error code.  If the code is zero, i. e. the command was successful,
+	 * the storage status is written to the output pointer's target.
+	 * The output pointer must not be null.
+	 *
+	 * @param out the output pointer for the storage status
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_get_status_storage(struct NK_storage_status* out);
+
+	/**
+	 * Get SD card usage attributes. Usable during hidden volumes creation.
+	 * If the command was successful (return value 0), the usage data is
+	 * written to the output pointer’s target.  The output pointer must
+	 * not be null.
+	 * Storage only
+	 * @param out the output pointer for the usage data
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_get_SD_usage_data(struct NK_SD_usage_data* out);
+
+	/**
+	 * Get SD card usage attributes as string.
+	 * Usable during hidden volumes creation.
+	 * Storage only
+	 * @return string with SD card usage attributes
+	 */
+	NK_C_API char* NK_get_SD_usage_data_as_string();
+
+	/**
+	 * Get progress value of current long operation.
+	 * Storage only
+	 * @return int in range 0-100 or -1 if device is not busy or -2 if an
+	 *         error occured
+	 */
+	NK_C_API int NK_get_progress_bar_value();
+
+/**
+ * Returns a list of connected devices' id's, delimited by ';' character. Empty string is returned on no device found.
+ * Each ID could consist of:
+ * 1. SC_id:SD_id_p_path (about 40 bytes)
+ * 2. path (about 10 bytes)
+ * where 'path' is USB path (bus:num), 'SC_id' is smartcard ID, 'SD_id' is storage card ID and
+ * '_p_' and ':' are field delimiters.
+ * Case 2 (USB path only) is used, when the device cannot be asked about its status data (e.g. during a long operation,
+ * like clearing SD card.
+ * Internally connects to all available devices and creates a map between ids and connection objects.
+ * Side effects: changes active device to last detected Storage device.
+ * Storage only
+ * @example Example of returned data: '00005d19:dacc2cb4_p_0001:0010:02;000037c7:4cf12445_p_0001:000f:02;0001:000c:02'
+ * @return string delimited id's of connected devices
+ */
+	NK_C_API char* NK_list_devices_by_cpuID();
+
+	/**
+	 * Returns a linked list of all connected devices, or null if no devices
+	 * are connected or an error occured.  The linked list must be freed by
+	 * calling NK_free_device_info.
+	 * @return a linked list of all connected devices
+	 */
+	NK_C_API struct NK_device_info* NK_list_devices();
+
+	/**
+	 * Free a linked list returned by NK_list_devices.
+	 * @param the linked list to free or null
+	 */
+	NK_C_API void NK_free_device_info(struct NK_device_info* device_info);
+
+/**
+ * Connects to the device with given ID. ID's list could be created with NK_list_devices_by_cpuID.
+ * Requires calling to NK_list_devices_by_cpuID first. Connecting to arbitrary ID/USB path is not handled.
+ * On connection requests status from device and disconnects it / removes from map on connection failure.
+ * Storage only
+ * @param id Target device ID (example: '00005d19:dacc2cb4_p_0001:0010:02')
+ * @return 1 on successful connection, 0 otherwise
+ */
+	NK_C_API int NK_connect_with_ID(const char* id);
+
+	/**
+	 * Connects to a device with the given path.  The path is a USB device
+	 * path as returned by hidapi.
+	 * @param path the device path
+	 * @return 1 on successful connection, 0 otherwise
+	 */
+        NK_C_API int NK_connect_with_path(const char* path);
+
+	/**
+	 * Blink red and green LED alternatively and infinitely (until device is reconnected).
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_wink();
+
+
+	/**
+	 * Enable update mode on Nitrokey Pro.
+	 * Supported from v0.11.
+	 * @param update_password 20 bytes update password
+   * @return command processing error code
+	 */
+	NK_C_API int NK_enable_firmware_update_pro(const char* update_password);
+
+  /**
+   * Change update-mode password on Nitrokey Pro.
+   * Supported from v0.11.
+   * @param current_firmware_password 20 bytes update password
+   * @param new_firmware_password 20 bytes update password
+   * @return command processing error code
+   */
+  NK_C_API int NK_change_firmware_password_pro(const char *current_firmware_password, const char *new_firmware_password);
+
+
+// as in ReadSlot::ResponsePayload
+struct ReadSlot_t {
+  uint8_t slot_name[15];
+  uint8_t _slot_config;
+  uint8_t slot_token_id[13];
+  uint64_t slot_counter;
+};
+
+
+NK_C_API int NK_read_HOTP_slot(const uint8_t slot_num, struct ReadSlot_t* out);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif //LIBNITROKEY_NK_C_API_H