rsa_mod_exp
if (!rsa->meth->rsa_mod_exp(ret, f, rsa, ctx))
if (!rsa->meth->rsa_mod_exp(ret, f, rsa, ctx))
.rsa_mod_exp = rsa_mod_exp,
int (*rsa_mod_exp)(BIGNUM *r0, const BIGNUM *I, RSA *rsa,
meth->rsa_mod_exp = mod_exp;
return meth->rsa_mod_exp;