to_der() public

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static VALUE
ossl_x509attr_to_der(VALUE self)
    X509_ATTRIBUTE *attr;
    VALUE str;
    int len;
    unsigned char *p;

    GetX509Attr(self, attr);
    if((len = i2d_X509_ATTRIBUTE(attr, NULL)) <= 0)
        ossl_raise(eX509AttrError, NULL);
    str = rb_str_new(0, len);
    p = (unsigned char *)RSTRING_PTR(str);
    if(i2d_X509_ATTRIBUTE(attr, &p) <= 0)
        ossl_raise(eX509AttrError, NULL);
    rb_str_set_len(str, p - (unsigned char*)RSTRING_PTR(str)); 

    return str;
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