99 lines
3.5 KiB
Markdown
99 lines
3.5 KiB
Markdown
# [RustCrypto]: Object Identifiers (OIDs)
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[![crate][crate-image]][crate-link]
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[![Docs][docs-image]][docs-link]
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[![Build Status][build-image]][build-link]
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![Apache2/MIT licensed][license-image]
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![Rust Version][rustc-image]
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[![Project Chat][chat-image]][chat-link]
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Const-friendly implementation of the ISO/IEC Object Identifier (OID) standard
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as defined in ITU [X.660], with support for BER/DER encoding/decoding as well
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as heapless `no_std` (i.e. embedded) environments.
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[Documentation][docs-link]
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## About OIDs
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Object Identifiers, a.k.a. OIDs, are an International Telecommunications
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Union (ITU) and ISO/IEC standard for naming any object, concept, or "thing"
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with a globally unambiguous persistent name.
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The ITU's [X.660] standard provides the OID specification. Every OID is part of
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a hierarchical namespace which begins with a *root OID*, which is either the
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ITU's root OID (0), the ISO's root OID (1), or the joint ISO/ITU root OID (2).
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The following is an example of an OID, in this case identifying the
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`rsaEncryption` algorithm:
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```text
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1.2.840.113549.1.1.1
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```
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For more information, see: <https://en.wikipedia.org/wiki/Object_identifier>
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## Implementation
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This library supports parsing OIDs in const contexts, e.g.:
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```rust
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use const_oid::ObjectIdentifier;
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pub const MY_OID: ObjectIdentifier = ObjectIdentifier::new_unwrap("1.2.840.113549.1.1.1");
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```
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The OID parser is implemented entirely in terms of `const fn` and without the
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use of proc macros.
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Additionally, it also includes a `const fn` OID serializer, and stores the OIDs
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parsed from const contexts encoded using the BER/DER serialization
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(sans header).
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This allows `ObjectIdentifier` to impl `AsRef<[u8]>` which can be used to
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obtain the BER/DER serialization of an OID, even one declared `const`.
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Additionally, it impls `FromStr` and `TryFrom<&[u8]>` and functions just as
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well as a runtime OID library.
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## Minimum Supported Rust Version (MSRV) Policy
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MSRV increases are not considered breaking changes and can happen in patch releases.
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The crate MSRV accounts for all supported targets and crate feature combinations, excluding
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explicitly unstable features.
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## License
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Licensed under either of:
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* [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
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* [MIT license](http://opensource.org/licenses/MIT)
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at your option.
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### Contribution
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Unless you explicitly state otherwise, any contribution intentionally submitted
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for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
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dual licensed as above, without any additional terms or conditions.
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[//]: # (badges)
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[crate-image]: https://img.shields.io/crates/v/const-oid?logo=rust
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[crate-link]: https://crates.io/crates/const-oid
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[docs-image]: https://docs.rs/const-oid/badge.svg
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[docs-link]: https://docs.rs/const-oid/
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[build-image]: https://github.com/RustCrypto/formats/actions/workflows/const-oid.yml/badge.svg
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[build-link]: https://github.com/RustCrypto/formats/actions/workflows/const-oid.yml
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[license-image]: https://img.shields.io/badge/license-Apache2.0/MIT-blue.svg
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[rustc-image]: https://img.shields.io/badge/rustc-1.85+-blue.svg
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[chat-image]: https://img.shields.io/badge/zulip-join_chat-blue.svg
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[chat-link]: https://rustcrypto.zulipchat.com/#narrow/stream/300570-formats
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[build-image]: https://github.com/RustCrypto/formats/workflows/const-oid/badge.svg?branch=master&event=push
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[build-link]: https://github.com/RustCrypto/formats/actions
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[//]: # (links)
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[RustCrypto]: https://github.com/rustcrypto
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[X.660]: https://www.itu.int/rec/T-REC-X.660
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