Encrypted OpenSSL Streams

Question

Does anyone know a good implementation for C ++ encrypted streams using OpenSSL ? Something that extends or wraps std :: istream and std :: ostream ?

I know that this can be done with boost (filtering stream), but I don’t want to enable boost just for that. Any unmanaged suggestions?

Answer 1

Boost library provides ssl stream:

http://www.boost.org/doc/libs/1_47_0/boost/asio/ssl/stream.hpp

SO ref: HTTPS request with Boost.Asio and OpenSSL

Answer 2

I came across the following implementations using std :: istream and std :: ostream.

• AES CTR mode encryption / decryption

http://openssl.6102.n7.nabble.com/EVP-Decrypt-Final-ex-fails-on-larger-files-td2434.html

• Blowfish

http://openssl.6102.n7.nabble.com/EVP-Decrypt-Final-ex-fails-on-larger-files-td2434.html

In addition, you can also look here:

http://www.appinf.com/docs/poco/Poco.Crypto.RSAKeyImpl.html

and here:

https://dev.marc.waeckerlin.org/projects/libpcscxx/browser/trunk/src/openssl.hxx?rev=60

Answer 3

If you want to do it yourself:

Subclass std :: streambuf for use with TCP or SSL (they basically work the same after opening the socket. Then you can do std :: istream and std :: ostream using this streambuf. If you don't want std :: iostream, you can make two streambufs, one for input and one for output.

std :: streambuf docs (basically just focus on overflow and stream): http://www.cplusplus.com/reference/streambuf/streambuf/

And a little tutorial on how to use libssl directly.

http://www.ibm.com/developerworks/linux/library/l-openssl/index.html