DSA_SUBPRIME_BITS
if ((err = big_random(&(key->x), DSA_SUBPRIME_BITS, rf)) !=
if ((brv = big_random(&(dsakey.k), DSA_SUBPRIME_BITS, rf)) != BIG_OK) {
#define DSA_SUBPRIME_BYTES (DSA_SUBPRIME_BITS >> 3)