crypto_bc_t
crypto_bufcall(crypto_bc_t bc, void (*func)(void *arg), void *arg)
crypto_unbufcall(crypto_bc_t bc)
crypto_bc_t
crypto_bufcall_free(crypto_bc_t bc)
extern crypto_bc_t crypto_bufcall_alloc(void);
extern int crypto_bufcall_free(crypto_bc_t bc);
extern int crypto_bufcall(crypto_bc_t bc, void (*func)(void *arg), void *arg);
extern int crypto_unbufcall(crypto_bc_t bc);