---
name: "sc_app_info_t"
section: "3"
platform: "linux"
package: "libopensc2-dev"
version: "0.11.13-1.1"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/sc_app_info_t"
---

# sc\_app\_info\_t(3)

OpenSC application structure

## NAME

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.