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