https://www.cryptopp.com/
https://debian.pkgs.org/sid/debian-main-amd64/libcrypto++6_5.6.4-9_amd64.deb.html
https://www.cryptopp.com/docs/ref/
https://www.cryptopp.com/wiki/

/usr/include/crypto++/
/usr/share/doc/libcrypto++-dev/Readme.txt.gz