Pure Rust embedded-friendly implementation of the Distinguished Encoding Rules (DER) for Abstract Syntax Notation One (ASN.1) as described in ITU X.690.
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 Specificationspkcs5: Password-Based Cryptography Specificationpkcs7: Cryptographic Message Syntaxpkcs8: Private-Key Information Syntax Specificationpkcs10: Certification Request Syntax Specificationsec1: Elliptic Curve Cryptographyspki: X.509 Subject Public Key Infox501: Directory Services Typesx509: Public Key Infrastructure CertificateThe 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.
no_std friendly: supports “heapless” usagealloc and std if desiredno_std friendly:const-oid: const-friendly OID implementationpem-rfc7468: PKCS/PKIX-flavored PEM library with constant-time decoder/encoderstime crate: date/time libraryThis 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.
Licensed under either of:
at your option.
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.