Crate red_asn1_derive

Macro to create ASN1 sequence from Rust struct

Attributes

• seq: Define attributes for the struct definition. Has the following flags:

  • application_tag : Number of application tag

• seq_field: Define attributes for a field of the struct. Has the following flags:

  • context_tag: Number of context tag
  • optional: Flag to indicate that is an optional field

Example

/*
Person ::= [APPLICATION 1] SEQUENCE {
    name:       [0] GeneralString,
    age:        [1] Integer,
    address:    [2] GeneralString OPTIONAL,
}
*/

use red_asn1::*;
use red_asn1_derive::Sequence;

#[derive(Sequence, Default)]
#[seq(application_tag = 1)]
struct Person {
    #[seq_field(context_tag = 0)]
    name: GeneralString,
    #[seq_field(context_tag = 1)]
    age: Integer,
    #[seq_field(context_tag = 2)]
    address: Option<GeneralString>
}

let john = Person{
    name: GeneralString::from("John").into(),
    age: Integer::from(18).into(),
    address: None
};

assert_eq!(
    vec![
        0x61, 0xf, 0x30, 0xd,
        0xa0, 0x6, 0x1b, 0x4, 0x4a, 0x6f, 0x68, 0x6e, // "John"
        0xa1, 0x3, 0x2, 0x1, 0x12 // 18
    ]
    , john.build()
);

let (_, rachel) = Person::parse(&[
    0x61, 0x1b, 0x30, 0x19,
    0xa0, 0x8, 0x1b, 0x6, 0x52, 0x61, 0x63, 0x68, 0x65, 0x6c, // "Rachel"
    0xa1, 0x3, 0x2, 0x1, 0x1e, // 30
    0xa2, 0x8, 0x1b, 0x6, 0x48, 0x61, 0x77, 0x61, 0x69, 0x69 // "Hawaii"
]).unwrap();

assert_eq!("Rachel", rachel.name);
assert_eq!(30, rachel.age);
assert_eq!(Some("Hawaii".to_string()), rachel.address);

Derive Macros

Sequence