PEM_read_bio_DSAPrivateKey
dsakey = PEM_read_bio_DSAPrivateKey(bio_buf, NULL, NULL, NULL);
dsakey = PEM_read_bio_DSAPrivateKey(bio_buf, NULL, NULL, NULL);
(PEM_read_bio_of_void *)PEM_read_bio_DSAPrivateKey,
dsa = PEM_read_bio_DSAPrivateKey(infile, NULL, NULL, NULL);