RustCrypto: ASN.1 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.

Documentation

About

This crate provides a no_std-friendly implementation of a subset of ASN.1 DER necessary for decoding/encoding various cryptography-related formats implemented as part of the RustCrypto project, e.g. the pkcs8 crate.

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

The implementation is presently specialized for documents which are smaller than 64kB, as that provides a safe bound for the current use cases. However, that may be revisited in the future depending on interest in support for larger documents. Please open a GitHub Issue if you find this limit constraining in practice.

License

Licensed under either of:

• Apache License, Version 2.0
• MIT license

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.