rust-asn1

This is a Rust library for parsing and generating ASN.1 data (DER only).

Installation

Add asn1 to the [dependencies] section of your Cargo.toml:

toml [dependencies] asn1 = "0.3"

Builds on Rust 1.41.0 and newer. However Implicit and Explicit require const generics, which require Rust 1.51.0 or greater and specifying the const-generics feature.

rust-asn1 is compatible with #![no_std] environments:

toml asn1 = { version = "0.3", default-features = false }

Usage

To parse a structure like:

Signature ::= SEQUENCE { r INTEGER, s INTEGER }

you would write:

```rust let result = asn1::parse(data, |d| { return d.readelement::()?.parse(|d| { let r = d.readelement::()?; let s = d.read_element::()?; return Ok((r, s)); }) });

match result { Ok((r, s)) => println!("r={}, s={}", r, s), Err(e) => println!("Error! {:?}", e), } ```

And to write that structure, you would do:

rust let result = asn1::write(|w| { w.write_element_with_type::<asn1::Sequence>(&|w: &mut asn1::Writer| { w.write_element(r); w.write_element(s); }) });