> DSA *pDSA = d2i_DSA_PUBKEY(NULL, (const unsigned char **) &pKey, dwKeySize);

Where and how is pKey set?  Not that the manpage says it's incremented to point 
*past* the object, so you need something like
        unsigned char data = .....whatever your data source is .....
        unsigned char *pKey = data
and then use &pKey in your call

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