192 lines
6.6 KiB
C
192 lines
6.6 KiB
C
/*
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* PSA crypto support for secure element drivers
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*/
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/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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*/
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#ifndef PSA_CRYPTO_SE_H
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#define PSA_CRYPTO_SE_H
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/*
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* Include the build-time configuration information header. Here, we do not
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* include `"mbedtls/build_info.h"` directly but `"psa/build_info.h"`, which
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* is basically just an alias to it. This is to ease the maintenance of the
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* TF-PSA-Crypto repository which has a different build system and
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* configuration.
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*/
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#include "psa/build_info.h"
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#include "psa/crypto.h"
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#include "psa/crypto_se_driver.h"
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/** The maximum location value that this implementation supports
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* for a secure element.
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*
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* This is not a characteristic that each PSA implementation has, but a
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* limitation of the current implementation due to the constraints imposed
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* by storage. See #PSA_CRYPTO_SE_DRIVER_ITS_UID_BASE.
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*
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* The minimum location value for a secure element is 1, like on any
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* PSA implementation (0 means a transparent key).
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*/
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#define PSA_MAX_SE_LOCATION 255
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/** The base of the range of ITS file identifiers for secure element
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* driver persistent data.
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*
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* We use a slice of the implementation reserved range 0xffff0000..0xffffffff,
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* specifically the range 0xfffffe00..0xfffffeff. The length of this range
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* drives the value of #PSA_MAX_SE_LOCATION. The identifier 0xfffffe00 is
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* actually not used since it corresponds to #PSA_KEY_LOCATION_LOCAL_STORAGE
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* which doesn't have a driver.
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*/
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#define PSA_CRYPTO_SE_DRIVER_ITS_UID_BASE ((psa_key_id_t) 0xfffffe00)
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/** The maximum number of registered secure element driver locations. */
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#define PSA_MAX_SE_DRIVERS 4
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/** Unregister all secure element drivers.
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*
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* \warning Do not call this function while the library is in the initialized
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* state. This function is only intended to be called at the end
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* of mbedtls_psa_crypto_free().
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*/
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void psa_unregister_all_se_drivers(void);
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/** Initialize all secure element drivers.
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*
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* Called from psa_crypto_init().
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*/
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psa_status_t psa_init_all_se_drivers(void);
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/** A structure that describes a registered secure element driver.
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*
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* A secure element driver table entry contains a pointer to the
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* driver's method table as well as the driver context structure.
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*/
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typedef struct psa_se_drv_table_entry_s psa_se_drv_table_entry_t;
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/** Return the secure element driver information for a lifetime value.
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*
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* \param lifetime The lifetime value to query.
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* \param[out] p_methods On output, if there is a driver,
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* \c *methods points to its method table.
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* Otherwise \c *methods is \c NULL.
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* \param[out] p_drv_context On output, if there is a driver,
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* \c *drv_context points to its context
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* structure.
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* Otherwise \c *drv_context is \c NULL.
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*
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* \retval 1
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* \p lifetime corresponds to a registered driver.
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* \retval 0
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* \p lifetime does not correspond to a registered driver.
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*/
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int psa_get_se_driver(psa_key_lifetime_t lifetime,
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const psa_drv_se_t **p_methods,
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psa_drv_se_context_t **p_drv_context);
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/** Return the secure element driver table entry for a lifetime value.
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*
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* \param lifetime The lifetime value to query.
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*
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* \return The driver table entry for \p lifetime, or
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* \p NULL if \p lifetime does not correspond to a registered driver.
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*/
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psa_se_drv_table_entry_t *psa_get_se_driver_entry(
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psa_key_lifetime_t lifetime);
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/** Return the method table for a secure element driver.
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*
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* \param[in] driver The driver table entry to access, or \c NULL.
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*
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* \return The driver's method table.
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* \c NULL if \p driver is \c NULL.
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*/
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const psa_drv_se_t *psa_get_se_driver_methods(
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const psa_se_drv_table_entry_t *driver);
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/** Return the context of a secure element driver.
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*
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* \param[in] driver The driver table entry to access, or \c NULL.
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*
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* \return A pointer to the driver context.
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* \c NULL if \p driver is \c NULL.
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*/
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psa_drv_se_context_t *psa_get_se_driver_context(
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psa_se_drv_table_entry_t *driver);
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/** Find a free slot for a key that is to be created.
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*
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* This function calls the relevant method in the driver to find a suitable
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* slot for a key with the given attributes.
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*
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* \param[in] attributes Metadata about the key that is about to be created.
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* \param[in] driver The driver table entry to query.
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* \param[out] slot_number On success, a slot number that is free in this
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* secure element.
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*/
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psa_status_t psa_find_se_slot_for_key(
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const psa_key_attributes_t *attributes,
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psa_key_creation_method_t method,
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psa_se_drv_table_entry_t *driver,
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psa_key_slot_number_t *slot_number);
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/** Destroy a key in a secure element.
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*
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* This function calls the relevant driver method to destroy a key
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* and updates the driver's persistent data.
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*/
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psa_status_t psa_destroy_se_key(psa_se_drv_table_entry_t *driver,
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psa_key_slot_number_t slot_number);
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/** Load the persistent data of a secure element driver.
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*
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* \param driver The driver table entry containing the persistent
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* data to load from storage.
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*
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* \return #PSA_SUCCESS
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* \return #PSA_ERROR_NOT_SUPPORTED
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* \return #PSA_ERROR_DOES_NOT_EXIST
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* \return #PSA_ERROR_STORAGE_FAILURE
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* \return #PSA_ERROR_DATA_CORRUPT
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* \return #PSA_ERROR_INVALID_ARGUMENT
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*/
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psa_status_t psa_load_se_persistent_data(
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const psa_se_drv_table_entry_t *driver);
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/** Save the persistent data of a secure element driver.
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*
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* \param[in] driver The driver table entry containing the persistent
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* data to save to storage.
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*
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* \return #PSA_SUCCESS
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* \return #PSA_ERROR_NOT_SUPPORTED
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* \return #PSA_ERROR_NOT_PERMITTED
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* \return #PSA_ERROR_NOT_SUPPORTED
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* \return #PSA_ERROR_INSUFFICIENT_STORAGE
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* \return #PSA_ERROR_STORAGE_FAILURE
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* \return #PSA_ERROR_INVALID_ARGUMENT
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*/
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psa_status_t psa_save_se_persistent_data(
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const psa_se_drv_table_entry_t *driver);
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/** Destroy the persistent data of a secure element driver.
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*
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* This is currently only used for testing.
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*
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* \param[in] location The location identifier for the driver whose
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* persistent data is to be erased.
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*/
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psa_status_t psa_destroy_se_persistent_data(psa_key_location_t location);
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/** The storage representation of a key whose data is in a secure element.
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*/
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typedef struct {
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uint8_t slot_number[sizeof(psa_key_slot_number_t)];
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} psa_se_key_data_storage_t;
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#endif /* PSA_CRYPTO_SE_H */
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