# Red ASN1
A little library to build/parse ASN1 DER
## Examples
Parsing and building `bool`:
```rust
use red_asn1::Asn1Object;
assert_eq!(true, bool::parse(&[0x1, 0x1, 0xff]).unwrap().1);
assert_eq!(false, bool::parse(&[0x1, 0x1, 0x0]).unwrap().1);
assert_eq!(true.build(), vec![0x1, 0x1, 0xff]);
assert_eq!(false.build(), vec![0x1, 0x1, 0x0]);
```
Parsing and building `Integer`:
```rust
use red_asn1::{Integer, Asn1Object};
assert_eq!(2, Integer::parse(&[0x2, 0x1, 0x2]).unwrap().1);
assert_eq!(2.build(), vec![0x2, 0x1, 0x2]);
```
Parsing and building `String`:
```rust
use red_asn1::Asn1Object;
assert_eq!(
"John".to_string(),
String::parse(&[0x1b, 0x4, 0x4a, 0x6f, 0x68, 0x6e]).unwrap().1
);
assert_eq!(
"John".to_string().build(),
vec![0x1b, 0x4, 0x4a, 0x6f, 0x68, 0x6e]
);
```
Creating custom sequences:
```rust
/*
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)]
pub name: GeneralString,
#[seq_field(context_tag = 1)]
pub age: Integer,
#[seq_field(context_tag = 2)]
pub 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);
```
## Implemented types
| BOOLEAN | Boolean | bool |
| INTEGER | Integer | i128, i64, i32, i16, u32 |
| BIT STRING | BitSring | |
| OCTET STRING | OctetString | Vec\<u8\> |
| GeneralString | GeneralString | String |
| IA5String | IA5String | ascii::AsciiString |
| GeneralizedTime | GeneralizedTime | |
| SEQUENCE OF | SequenceOf | Vec<T: Asn1Object> |
| SEQUENCE | | struct with #[derive(Sequence, Default)] |
| OPTIONAL | Optional | Option |
| | | |