-void serpent_init(void * key, uint8_t keysize, serpent_ctx_t * ctx);
-void serpent_enc(void * buffer, serpent_ctx_t * ctx);
-void serpent_dec(void * buffer, serpent_ctx_t * ctx);
+void serpent_init(const void* key, uint16_t keysize_b, serpent_ctx_t* ctx);
+void serpent_enc(void* buffer, const serpent_ctx_t* ctx);
+void serpent_dec(void* buffer, const serpent_ctx_t* ctx);