+/** \fn void noekeon_enc(void* buffer, void* key)
+ * \brief noekeon encrytion funtion
+ *
+ * This function encrypts a block (64 bit = 8 byte) with the noekeon encrytion
+ * algorithm. Due to the two modes of noekeon (direct mode and indirect mode)
+ * the second parameter either points directly to the key (direct mode) or to a
+ * context generated by the noekeon_init() function (indirect mode)
+ * \param buffer pointer to the 64 bit (8 byte) block to encrypt
+ * \param key pointer to either the key (128 bit = 16 byte; direct mode) or
+ * to the context (indirect mode)
+ */
+void noekeon_enc(void* buffer, const void* key);
+
+/** \fn void noekeon_enc(void* buffer, void* key)
+ * \brief noekeon encrytion funtion
+ *
+ * This function decrypts a block (64 bit = 8 byte) encrypted with the noekeon
+ * encrytion algorithm. Due to the two modes of noekeon (direct mode and
+ * indirect mode) the second parameter either points directly to the key
+ * (direct mode) or to a context generated by the noekeon_init() function
+ * (indirect mode)
+ * \param buffer pointer to the 64 bit (8 byte) block to decrypt
+ * \param key pointer to either the key (128 bit = 16 byte; direct mode) or
+ * to the context (indirect mode)
+ */
+void noekeon_dec(void* buffer, const void* key);
+
+
+/** \fn void noekeon_init(void* key, noekeon_ctx_t* ctx)
+ * \brief noekeon context generation function for indirect mode
+ *
+ * This function generates a context from the supplied key for using
+ * noekeon in indirect mode. For using noekeon in direct mode supply the key
+ * direct to the noekeon_enc() and noekeon_dec() functions
+ * \param key pointer to the key (128 bit = 16 byte)
+ * \param ctx pointer to the context to fill with key material
+ * to the context (indirect mode)
+ */
+void noekeon_init(const void* key, noekeon_ctx_t* ctx);