BN_generate_prime_ex2
retval = BN_generate_prime_ex2(ret, bits, safe, add, rem, cb, ctx);
if (!BN_generate_prime_ex2(ret->params.p, prime_len, 1, t1, t2, cb, ctx))
if (!BN_generate_prime_ex2(prime, bitsr[i] + adj, 0, NULL, NULL,
int BN_generate_prime_ex2(BIGNUM *ret, int bits, int safe,