* {@link #AUTHTYPE_EAP_SIM}
* @param data authentication challenge data, base64 encoded.
* See 3GPP TS 31.102 7.1.2 for more details.
- * @return the response of authentication, or null if not available
+ * @return the response of authentication. This value will be null in the following cases:
+ * Authentication error, incorrect MAC
+ * Authentication error, security context not supported
+ * Key freshness failure
+ * Authentication error, no memory space available
+ * Authentication error, no memory space available in EFMUK
*/
// TODO(b/73660190): This should probably require MODIFY_PHONE_STATE, not
// READ_PRIVILEGED_PHONE_STATE. It certainly shouldn't reference the permission in Javadoc since
* {@link #AUTHTYPE_EAP_SIM}
* @param data authentication challenge data, base64 encoded.
* See 3GPP TS 31.102 7.1.2 for more details.
- * @return the response of authentication, or null if not available
+ * @return the response of authentication. This value will be null in the following cases only
+ * (see 3GPP TS 31.102 7.3.1):
+ * Authentication error, incorrect MAC
+ * Authentication error, security context not supported
+ * Key freshness failure
+ * Authentication error, no memory space available
+ * Authentication error, no memory space available in EFMUK
* @hide
*/
public String getIccAuthentication(int subId, int appType, int authType, String data) {