用锈蚀中的预编码DER部件创建DER编码的ASN.1

Question

我想在Rust中编码以下ASN.1结构：

issuerAndSubject ::= SEQUENCE {
    issuer     Name,
    subject    Name
}

Name structure is defined in RFC5280和情结。我不想用“铁锈”来重新定义这个词。

我已经在锈蚀-openssl中创建了一个issuer和subject：

let issuer: &X509NameRef = get_issuer();
let subject: &X509NameRef = get_subject();

我可以很容易地获得这些对象的更多编码：

let issuer_der = issuer.to_der().unwrap();
let subject_der = subject.to_der().unwrap();

但我需要将它们插入到SEQUENCE中。我的首选是使用Rust的asn1机箱，它允许创建SEQUENCE：

let ias_der = asn1::write(|w| {
        w.write_element(
            &asn1::SequenceWriter::new(&|w| {
                w.write_element(&issuer_der);   // I know, this doesn't work, but
                w.write_element(&subject_der);  // how do I do it?
        }));
    });

有办法用编码的数据创建序列吗？

Answer 1

您只需使用dervice宏并使用一个简单的结构：

#[derive(asn1::Asn1Read, asn1::Asn1Write, Debug)]
struct Signature {
    issuer: u64,
    subject: u64,
}

fn main() {
    let data = asn1::write_single(&Signature{issuer: 0, subject: 1});
    let sig: Signature = asn1::parse_single::<Signature>(data.as_slice()).unwrap();
    let data = asn1::write_single(&sig);
    eprintln!("{:?}", sig);
    eprintln!("{:?}", data);
}