Custom Sign Callback for ECC TLS Handshake

[nocommercials at t-online.de]

Hey there,
 
I currently create a program that does a TLS handshake using ECC 
certificates.
The private key is not accessible to that program so that I could load it 
into openssl and hence the sign step during handshake has to be offloaded 
to another component in the system.
For that purpose I do not find a callback or something.

What would be the correct way to achive this?
The way to have the data signed is non-standard, so I cannot use some 
standard such as PKCS11 or something.
 
I am glad to get just pointed to where to start with, rest I can figure 
out.

Thanks!
 

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