Decodes ec parameter from a memory buffer.
\param key a pointer to a EC_KEY object which should be used (or null)
\param in pointer to memory with the DER encoded ec parameters
\param len length of the DER encoded ec parameters
\return a EC_KEY object with the decoded parameters or null if an error
occurred.
Decodes ec parameter from a memory buffer. \param key a pointer to a EC_KEY object which should be used (or null) \param in pointer to memory with the DER encoded ec parameters \param len length of the DER encoded ec parameters \return a EC_KEY object with the decoded parameters or null if an error occurred.