https://manpages.ubuntu.com/manpages/xenial/man3/BN_print.3ssl.html
Ubuntu Manpage: BN_bn2bin, BN_bin2bn, BN_bn2hex, BN_bn2dec, BN_hex2bn, BN_dec2bn,
ubuntumanpagebn
https://manpages.ubuntu.com/manpages/xenial/man3/BN_bn2hex.3ssl.html
Ubuntu Manpage: BN_bn2bin, BN_bin2bn, BN_bn2hex, BN_bn2dec, BN_hex2bn, BN_dec2bn,
ubuntumanpagebn