part_of_mpi.h

struct gcry_mpi
{
  int alloced;         /* Array size (# of allocated limbs). */
  int nlimbs;          /* Number of valid limbs. */
  int sign;        /* Indicates a negative number and is also used
                  for opaque MPIs to store the length.  */
  unsigned int flags; /* Bit 0: Array to be allocated in secure memory space.*/
                      /* Bit 2: The limb is a pointer to some m_alloced data.*/
                      /* Bit 4: Immutable MPI - the MPI may not be modified.  */
                      /* Bit 5: Constant MPI - the MPI will not be freed.  */
  mpi_limb_t *d;      /* Array with the limbs */
};