IOCTL_TAPE_GET_ENCRYPTION_STATE

The IOCTL code for IOCTL_TAPE_GET_ENCRYPTION_STATE is defined as follows.

#define IOCTL_TAPE_GET_ENCRYPTION_STATE CTL_CODE(IOCTL_TAPE_BASE, 0x0820, 
				METHOD_BUFFERED, FILE_READ_ACCESS ) 

The IOCTL gets encryption states for supported devices by using the following structure.

typedef struct _ENCRYPTION_STATUS
{
    UCHAR ucEncryptionCapable;   /* (1)Set this field as a boolean based on 
				                          the capability of the drive  */
    UCHAR ucEncryptionMethod;    /* (2)Set this field to one of the 
				                          defines METHOD_* below              */
    UCHAR ucEncryptionState;     /* (3)Set this field to one of the 
				                          #defines STATE_* below */
    UCHAR aucReserved[13];
} ENCRYPTION_STATUS, *PENCRYPTION_STATUS;

#defines for METHOD.

#define ENCRYPTION_METHOD_NONE    		0 /* Only used in 
				                                GET_ENCRYPTION_STATE */
#define ENCRYPTION_METHOD_LIBRARY   	1 /* Only used in 
				                                GET_ENCRYPTION_STATE */
#define ENCRYPTION_ METHOD_SYSTEM   	2 /* Only used in 
				                                GET_ENCRYPTION_STATE */
#define ENCRYPTION_ METHOD_APPLICATION 	3 /* Only used in 
				                                   GET_ENCRYPTION_STATE */
#define ENCRYPTION_ METHOD_CUSTOM		4 /* Only used in 
				                                GET_ENCRYPTION_STATE */
#define ENCRYPTION_ METHOD_UNKNOWN		5 /* Only used in 
				                                GET_ENCRYPTION_STATE */

#defines for STATE.

#define  ENCRYPTION_STATE_OFF 0  /* Used in GET/SET_ENCRYPTION_STATE */
#define  ENCRYPTION_STATE_ON	1  /* Used in GET/SET_ENCRYPTION_STATE */
#define  ENCRYPTION_STATE_NA	2  /* Only used in GET_ENCRYPTION_STATE*/

An example of the IOCTL_TAPE_GET_ENCRYPTION_STATE command is

ENCRYPTION_STATUS scEncryptStat;
DeviceIoControl(hDevice,
                IOCTL_TAPE_GET_ENCRYPTION_STATE,
                &scEncryptStat,
                sizeof(ENCRYPTION_STATUS),
                &scEncryptStat,
                sizeof(ENCRYPTION_STATUS),
                ,&cb
                (LPOVERLAPPED) NULL);