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#78 in Cryptography
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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.
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:
cms
: Cryptographic Message Syntaxpkcs1
: RSA Cryptography Specificationspkcs5
: Password-Based Cryptography Specificationpkcs8
: Private-Key Information Syntax Specificationpkcs12
: Personal Information Exchange Syntaxsec1
: Elliptic Curve Cryptographyspki
: X.509 Subject Public Key Infox509-cert
: Public Key Infrastructure Certificatex509-ocsp
: Online Certificate Status Protocol
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
andstd
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 implementationpem-rfc7468
: PKCS/PKIX-flavored PEM library with constant-time decoder/encoderstime
crate: date/time library
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
~0–500KB