mem
void * gnutls_realloc_fast (void *ptr, size_t size);
void *ptr
size_t size
#define zrelease_mpi_key(mpi)
#define zeroize_key(x, size) gnutls_memset(x, 0, size)
#define zeroize_temp_key zeroize_key
#define zrelease_temp_mpi_key zrelease_mpi_key