#asn1 #crypto #itu #pkcs

no-std der

Pure Rust embedded-friendly implementation of the Distinguished Encoding Rules (DER) for Abstract Syntax Notation One (ASN.1) as described in ITU X.690 with full support for heapless no_std targets

18 releases

Uses new Rust 2021

new 0.6.1 Dec 6, 2022
0.6.0 May 8, 2022
0.6.0-pre.3 Mar 14, 2022
0.5.1 Nov 17, 2021
0.1.0 Dec 22, 2020

#538 in Cryptography

Download history 153067/week @ 2022-08-15 162142/week @ 2022-08-22 170950/week @ 2022-08-29 164461/week @ 2022-09-05 179294/week @ 2022-09-12 187747/week @ 2022-09-19 178351/week @ 2022-09-26 175082/week @ 2022-10-03 196784/week @ 2022-10-10 197931/week @ 2022-10-17 195697/week @ 2022-10-24 195110/week @ 2022-10-31 194538/week @ 2022-11-07 190012/week @ 2022-11-14 170862/week @ 2022-11-21 190817/week @ 2022-11-28

756,198 downloads per month
Used in 1,169 crates (23 directly)

Apache-2.0 OR MIT

365KB
8K SLoC

RustCrypto: ASN.1 DER

Crate Docs Build Status Apache2/MIT licensed Rust Version Project Chat

Pure Rust embedded-friendly implementation of the Distinguished Encoding Rules (DER) for Abstract Syntax Notation One (ASN.1) as described in ITU X.690.

Documentation

About

This crate provides a no_std-friendly implementation of a subset of ASN.1 DER necessary for decoding/encoding the following cryptography-related formats implemented as crates maintained by the RustCrypto project:

  • pkcs1: RSA Cryptography Specifications
  • pkcs5: Password-Based Cryptography Specification
  • pkcs7: Cryptographic Message Syntax
  • pkcs8: Private-Key Information Syntax Specification
  • pkcs10: Certification Request Syntax Specification
  • sec1: Elliptic Curve Cryptography
  • spki: X.509 Subject Public Key Info
  • x501: Directory Services Types
  • x509: Public Key Infrastructure Certificate

The core implementation avoids any heap usage (with convenience methods that allocate gated under the off-by-default alloc feature).

The DER decoder in this crate performs checks to ensure that the input document is in canonical form, and will return errors if non-canonical productions are encountered. There is currently no way to disable these checks.

Features

  • Rich support for ASN.1 types used by PKCS/PKIX documents
  • Performs DER canonicalization checks at decoding time
  • no_std friendly: supports "heapless" usage
  • Optionally supports alloc and std if desired
  • No hard dependencies! Self-contained implementation with optional integrations with the following crates, all of which are no_std friendly:
    • const-oid: const-friendly OID implementation
    • pem-rfc7468: PKCS/PKIX-flavored PEM library with constant-time decoder/encoders
    • time crate: date/time library

Minimum Supported Rust Version

This crate requires Rust 1.57 at a minimum.

We may change the MSRV in the future, but it will be accompanied by a minor version bump.

License

Licensed under either of:

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

Dependencies

~0–255KB