* \param src src EC_KEY object
* \return dst or NULL if an error occurred.
*/
-EC_KEY *EC_KEY_copy(EC_KEY *dst, EC_KEY *src);
+EC_KEY *EC_KEY_copy(EC_KEY *dst, const EC_KEY *src);
/** Creates a new EC_KEY object and copies the content from src to it.
* \param src the source EC_KEY object
* \return newly created EC_KEY object or NULL if an error occurred.
*/
-EC_KEY *EC_KEY_dup(EC_KEY *src);
+EC_KEY *EC_KEY_dup(const EC_KEY *src);
/** Increases the internal reference count of a EC_KEY object.
* \param key EC_KEY object
* \return 1 on success and 0 if an error occurred
*/
-int EC_KEY_oct2priv(EC_KEY *key, unsigned char *buf, size_t len);
+int EC_KEY_oct2priv(EC_KEY *key, const unsigned char *buf, size_t len);
/** Encodes a EC_KEY private key to an octet string
* \param key key to encode