> #ifndef SSL_MODE_SEND_FALLBACK_SCSV
> #define SSL_MODE_SEND_FALLBACK_SCSV 0x00000080L
> #endif

That will not work. You can do this:
#ifdef SSL_MODE_SEND_FALLBACK_SCSV
        SSL_CTX_set_mode(ctx, SSL_MODE_SEND_FALLBACK_SCSV)
#endif

But that is not the same thing.

You cannot just slip SCSV into an application without code changes to the 
application and to openssl.

--  
Principal Security Engineer, Akamai Technologies
IM: rs...@jabber.me Twitter: RichSalz

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