BN_div_reciprocal
int BN_div_reciprocal(BIGNUM *dv, BIGNUM *rem, const BIGNUM *m,
return BN_div_reciprocal(NULL, r, r, recp, ctx);
return BN_div_reciprocal(NULL, r, r, recp, ctx);
CHECK_GOTO(BN_div_reciprocal(d, c, a, recp, ctx));