This question would be much better addressed to OpenSSL-users (and would be 
much more likely receive an answer there).  This list addresses development of 
the OpenSSL software itself.

> On Sep 15, 2014, at 3:54 PM, "Bush, Stephen F (GE Global Research)" 
> <[email protected]> wrote:
> 
> I would like to implement pre-shared keys using OpenSSL (another mechanism is 
> being used to provide for a common secret at all nodes to be used as a 
> symmetric key). My goal is for OpenSSL to simply load the key from a local 
> location and use it. No certificates should be involved.
>  
> I notice two functions: SSL_set_psk_client_callback() and a corresponding 
> server callback. I assume I don’t need the SSL_CTX_use_psk_identity_hint().
>  
> 1.     Is an identify hint function required?
> 2.     Where would be the best place to call the client/server callback 
> functions?
> 3.     Is this all that is required to enable pre-shared keys to work?
>  
> If there is any further information regarding how to implement pre-shared 
> keys (particularly examples), it would be greatly appreciated.
>  
> Thanks,
> Stephen F Bush (GE Global Research)
> Author
> http://www.amazon.com/author/stephenbush

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