BIO_printf(bio_err, "-sign sign with private key\n");
BIO_printf(bio_err, "-verify verify with public key\n");
BIO_printf(bio_err, "-encrypt encrypt with public key\n");
BIO_printf(bio_err, "-decrypt decrypt with private key\n");
BIO_printf(bio_err, "-hexdump hex dump output\n");
BIO_printf(bio_err, "-sign sign with private key\n");
BIO_printf(bio_err, "-verify verify with public key\n");
BIO_printf(bio_err, "-encrypt encrypt with public key\n");
BIO_printf(bio_err, "-decrypt decrypt with private key\n");
BIO_printf(bio_err, "-hexdump hex dump output\n");