# OpenSC API Reference

sc_app_info_t
3
opensc

# sc_app_info_t

OpenSC application structure

## Synopsis

    #include <opensc.h>

    #define SC_MAX_AID_SIZE            16

    typedef struct sc_app_info {
    	unsigned char aid[SC_MAX_AID_SIZE];
    	size_t aid_len;
    	char *label;
    	sc_path_t path;
    	unsigned char *ddo;
    	size_t ddo_len;

    	const char *desc;
    	int rec_nr;
    } sc_app_info_t;

## Description

This structure describes a smart card application. It contains the following members:

aid

  The applications's AID. An AID uniquely identifies an application, and consists of an RID (a 5-byte "Registered Application Provider Identifier") and a PIX, which identifies an application by that provider. For example, the RID for PKCS#15 consists of the bytes A0 00 00 00 63, and the PIX is the string "PKCS-15". Thus, the AID of a PKCS#15 application on a smart card is A0 00 00 00 63 50 4B 43 53 2D 31.

aid_len

  The length of the AID in bytes.

label

  A UTF-8 string describing the application.

path

  The application's full path on the card, starting at the MF.

ddo

ddo_len

desc

  A description of the application, if available.

rec_nr

  If the EF(DIR) file is record-structured, this has the record number in which this application is stored. Otherwise, this is -1.