static int ubsec_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void));
static int ubsec_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
const BIGNUM *m, BN_CTX *ctx);
static int ubsec_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void));
static int ubsec_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
const BIGNUM *m, BN_CTX *ctx);