LO_KEY_SIZE        43 include/linux/loop.h 	char		lo_encrypt_key[LO_KEY_SIZE];
LO_KEY_SIZE        96 include/linux/loop.h 	unsigned char	   lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
LO_KEY_SIZE       113 include/linux/loop.h 	__u8		   lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */