#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

26 releases

0.7.8 Aug 7, 2023
0.7.7 Jun 29, 2023
0.7.6 May 16, 2023
0.7.1 Mar 7, 2023
0.1.0 Dec 22, 2020

#454 in Cryptography

Download history 486901/week @ 2023-08-16 531905/week @ 2023-08-23 505593/week @ 2023-08-30 529539/week @ 2023-09-06 540723/week @ 2023-09-13 520005/week @ 2023-09-20 476626/week @ 2023-09-27 521517/week @ 2023-10-04 548514/week @ 2023-10-11 568610/week @ 2023-10-18 607238/week @ 2023-10-25 620708/week @ 2023-11-01 682056/week @ 2023-11-08 722296/week @ 2023-11-15 605203/week @ 2023-11-22 543851/week @ 2023-11-29

2,683,494 downloads per month
Used in 3,115 crates (56 directly)

Apache-2.0 OR MIT

460KB
10K 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 1.65 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

~0–375KB