https://manpages.ubuntu.com/manpages/xenial/man3/ECDSA_do_verify.3ssl.html
Ubuntu Manpage: ECDSA_SIG_new, ECDSA_SIG_free, i2d_ECDSA_SIG, d2i_ECDSA_SIG,
new freeubuntumanpageecdsasig
https://manpages.ubuntu.com/manpages/xenial/man3/ECDSA_size.3ssl.html
Ubuntu Manpage: ECDSA_SIG_new, ECDSA_SIG_free, i2d_ECDSA_SIG, d2i_ECDSA_SIG,
new freeubuntumanpageecdsasig
https://manpages.ubuntu.com/manpages/xenial/man3/ECDSA_do_sign_ex.3ssl.html
Ubuntu Manpage: ECDSA_SIG_new, ECDSA_SIG_free, i2d_ECDSA_SIG, d2i_ECDSA_SIG,
new freeubuntumanpageecdsasig
https://manpages.ubuntu.com/manpages/xenial/man3/ECDSA_sign.3ssl.html
Ubuntu Manpage: ECDSA_SIG_new, ECDSA_SIG_free, i2d_ECDSA_SIG, d2i_ECDSA_SIG,
new freeubuntumanpageecdsasig