Card-level operations

After activation, the selected application is the master application. It is possible to select another application using the mifare_desfire_select_application() function (see bellow).

The mifare_desfire_get_version() function retrieve various information about the provided tag, including UID, batch number, production date, and hardware and software information. Refer to the freefare.h header file for details about the version_info field.

The mifare_desfire_free_mem() functions returns the size of the free memory on the PICC (in bytes).

The mifare_desfire_set_configuration() function can be used to deactivate the format function when setting disable_format to a value different from 0, or swicth the card to use random UDI setting enable_random_uid to a non-zero value.

The mifare_desfire_set_default_key function sets the key argument as the default key for new applications.

The mifare_desfire_set_ats function replace the ATS bytes returned by PICC when it is selected.

The mifare_desfire_get_card_uid function can be used with a PICC configured for using random UID to retrieve the original UID of the target.

The mifare_desfire_format_picc() function resets tag to factory defaults. For this function to work, a previous authentication with the card master key is required.

Application-level operations

The mifare_desfire_authenticate() function performs an authentication using the key number key_no on the card and the key (3)DES key on tag.

The mifare_desfire_authenticate_aes() function performs an authentication using an AES key.

The mifare_desfire_authenticate_iso() function performs an ISO authentication using either a 3DES or a 3K3DES key.

The mifare_desfire_get_key_settings() function, returns the settings and the number of keys max_keys of the selected application.

The mifare_desfire_change_key_settings() function changes the selected application settings to settings. The application number of keys cannot be changed after the application has been created.

The mifare_desfire_change_key() changes the key key_no from old_key to new_key on tag. Depending on the application settings, a previous authentication with the same key or another key may be required.

The mifare_desfire_get_key_version() function retrieves the version of the key with number key_no of the selected application.

The mifare_desfire_create_application() function, creates an application with AID aid, the settings key settings and key_no authentication keys. Authentication keys are set to 0 after creation.

The mifare_desfire_create_application_3k3des() and mifare_desfire_create_application_aes() functions acts as the mifare_desfire_create_application() function except that the whole application is configured to use 3K3DES or AES keys. It is possible to achive the same result using the mifare_desfire_create_application() function and ORing the key_no argument with APPLICATION_CRYPTO_3K3DES or APPLICATION_CRYPTO_AES respectively.

The mifare_desfire_create_application_iso() acts as the mifare_desfire_create_application() function but allows one to specify if the created files within the application shall have an ISO file identifier setting want_iso_file_identifiers to a non-NULL value, a DF can be provided using iso_file_id, as long as an optional file name iso_file_name of length iso_file_name_len (in bytes).

The mifare_desfire_create_application_3k3des_iso() and mifare_desfire_create_application_aes_iso() function acts as the regular mifare_desfire_create_application_3k3des() and mifare_desfire_create_application_aes() functions, providing the same extensions ISO parameters of mifare_desfire_create_application_iso().

The mifare_desfire_delete_application() deletes the application identified by AID aid.

The mifare_desfire_get_application_ids() function returns a list of all applications of the card. The aids array has to be freed after usage calling mifare_desfire_free_application_ids().

The mifare_desfire_get_df_names() retrieves the list of DF dfs from tag and set count to the number of idems in the allocated array. Memory has to be freed by the user using free(3).

File-level operations

The mifare_desfire_get_iso_file_ids() function returns the list of count file ISO identifiers as files. The memory allocated for files has to be reclaimed using free(3).

The mifare_desfire_get_file_settings() function retrieves the settings of the file file_no of the selected application of tag.

The mifare_desfire_change_file_settings() function change the communication_settings and access_rights of the file file_no of the selected application of tag.

The mifare_desfire_create_*() family of functions create a new file file_no with the provided communication_settings and access_rights on tag.

mifare_desfire_create_std_data_file()

creates a standard data file of size file_size.

mifare_desfire_create_backup_data_file()

creates a backup data file of size file_size.

mifare_desfire_create_value_file()

creates a value file of value value constrained in the range lower_limit upper_limit, and with the limited_credit_enable settings.

mifare_desfire_create_linear_record_file()

creates a linear record file that can hold max_number_of_records records of size record_size.

mifare_desfire_create_cyclic_record_file()

creates a cyclic record file that can hold max_number_of_records records of size record_size.

The mifare_desfire_create_*_iso() family of functions acts as the functions without the _iso suffix but provide an additionnal argument iso_file_id.

The mifare_desfire_delete_file() removes the file file_no from the selected application of tag.

Data-level operations

The mifare_desfire_write_data() function writes length bytes of data from offset offset of the file file_no and copies it to data. The function returns the number of bytes written.

The mifare_desfire_get_value() reads the value of the file file_no of the selected application.

The mifare_desfire_credit() function adds amount to the value of the file file_no of the selected application.

The mifare_desfire_debit() function substracts amount to the value of the file file_no of the selected application.

to the value of the file file_no of the selected application.

The mifare_desfire_limited_credit() function adds amount to the value of the file file_no of the selected application.

The mifare_desfire_write_record() function writes length records starting at record offset of data in the file file_no and returns the number of bytes written.

The mifare_desfire_read_records() function reads length records starting at record offset from the file file_no and copy them to data, returning the number of bytes read.

The mifare_desfire_clear_record_file() function erase all records from the file file_no of the selected application.

The mifare_desfire_commit_transaction() validates the set of pending changes on the tag, while the mifare_desfire_abort_transaction() rollbacks the changes.

All data-manipulation functions that read data from and write data to files come with an *_ex() variant (e.g. mifare_desfire_read_data_ex()) which accepts an extra parameter cs that defines the communication settings to use. If not provided, the library will try to read-out this value from the file's configuration. Because reading this information may be denied, the *_ex() variant of functions still allows using the library for advanced usage.