webpki
A Rust library for validating Web PKI X.509 certificates with zero-copy parsing and no heap allocations.
What is webpki?
webpki is a Rust library that validates Web PKI (TLS/SSL) certificates, providing a full client-side implementation for secure TLS connections. It is designed to precisely define and implement the Web PKI standard with a focus on security and efficiency, solving the need for a reliable certificate validation library across diverse environments.
Developers building secure client applications in Rust, such as those working on embedded IoT devices, mobile apps, desktop software, or server infrastructure that require TLS certificate validation.
Developers choose webpki for its memory safety guarantees through Rust, zero-copy parsing for efficiency, and minimal resource usage with no heap allocations, making it ideal for performance-critical and embedded systems. Its focus on being the definitive Web PKI implementation offers a precise and secure alternative to other libraries.
Overview
WebPKI X.509 Certificate Validation in Rust
Use Cases
Best For
- Implementing TLS certificate validation in embedded IoT applications with limited memory and processing resources.
- Building secure mobile or desktop applications in Rust that require efficient and safe certificate parsing.
- Developing server infrastructure components that need a lightweight, memory-safe Web PKI client implementation.
- Creating cross-platform applications where zero heap allocations and small code size are critical for performance.
- Integrating certificate validation into Rust projects using the ring library for cryptographic operations.
- Defining or auditing Web PKI standards with a precise, open-source implementation as a reference.
Not Ideal For
- Projects requiring immediate support for advanced PKI features like Certificate Transparency or OCSP stapling.
- Non-Rust applications that need a ready-to-use C or C++ binding for certificate validation.
- Server-side implementations needing full PKIX validation beyond the Web PKI client focus.
Pros & Cons
Pros
Rust's compiler ensures no buffer overflows, use-after-free, or data races, providing a secure foundation for certificate validation as highlighted in the README.
Leverages Rust's borrow checker for safe parsing without data copying, enhancing performance in resource-constrained environments as described in the key features.
Avoids heap allocations and maintains tight stack memory bounds, making it ideal for embedded systems and IoT applications, per the README's design goals.
Aims to not only implement but precisely define the Web PKI standard, offering a reference for security-focused development, as stated in the project description.
Cons
As a first prototype, it lacks maturity, with many planned features like Certificate Transparency and key pinning not yet implemented, as admitted in the README.
Currently only available for Rust; the promised C-language wrapper is still in development, restricting use in non-Rust projects, based on the planned improvements list.
Critical PKI features such as OCSP stapling and custom algorithm support are listed as future improvements, not present in the current release, limiting immediate usability.
Frequently Asked Questions
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