+typedef void (*nessie_bc_gen_fpt)(uint8_t* key, uint16_t keysize_b, void* ctx);
+typedef void (*nessie_bc_free_fpt)(void* ctx);
+typedef void (*nessie_bc_enc_fpt)(void* buffer, void* ctx);
+typedef void (*nessie_bc_dec_fpt)(void* buffer, void* ctx);
+
+typedef struct nessie_bc_ctx_st{
+ uint16_t keysize_b;