OpenSSL::X509::Name#to_der

static VALUE
ossl_x509name_to_der(VALUE self)
{
    X509_NAME *name;
    VALUE str;
    long len;
    unsigned char *p;

    GetX509Name(self, name);
    if((len = i2d_X509_NAME(name, NULL)) <= 0)
        ossl_raise(eX509NameError, NULL);
    str = rb_str_new(0, len);
    p = (unsigned char *)RSTRING_PTR(str);
    if(i2d_X509_NAME(name, &p) <= 0)
        ossl_raise(eX509NameError, NULL);
    ossl_str_adjust(str, p);

    return str;
}