Enabling FIPS-Compliant Cryptography in Rust Applications | SafeLogic

Modern systems programming is evolving rapidly, driven by the need for performance, safety, and reliability. Rust has emerged as a leading language in this space, offering memory safety without sacrificing speed.

But for organizations operating in regulated environments, performance and safety are only part of the equation. Cryptographic compliance, especially with standards like FIPS 140, is equally critical.

The challenge? Rust’s flexibility in choosing cryptographic libraries makes it difficult to enforce consistent compliance.

The Role of Rust in Modern Infrastructure

Rust is gaining rapid adoption across industries for building secure, high-performance systems. It is commonly used for:

• Systems programming and infrastructure components
• Networking services and backend systems
• Security-sensitive applications
• Cloud-native and embedded environments

Its strong guarantees around memory safety and concurrency make it especially attractive for applications that handle sensitive data or operate in critical environments.

However, Rust’s design philosophy emphasizes flexibility and developer choice, particularly when it comes to cryptography.

Where Cryptography Actually Happens

Unlike some platforms that standardize cryptographic behavior, Rust does not provide a built-in cryptographic implementation. Instead, developers select cryptographic functionality through external libraries (crates).

Common approaches include:

• OpenSSL-based crates (e.g., rust-openssl, rustls-openssl)
• Native Rust cryptographic libraries
• Alternative TLS stacks such as BoringSSL or AWS-LC

Applications are linked against these dependencies at build time, meaning the cryptographic behavior of a Rust application is entirely determined by the libraries it includes.

The FIPS Compliance Gap

For organizations that require FIPS 140 compliance, this flexibility introduces a significant challenge.

Key issues include:

• Rust does not manage or enforce cryptographic standards
• Multiple cryptographic paths can exist within a single ecosystem
• Native Rust crypto libraries may not use OpenSSL at all
• Non-OpenSSL implementations cannot leverage FIPS-validated modules

In practice, this means that even well-intentioned development efforts can result in applications that entirely bypass approved cryptographic boundaries.

Why This Matters

Rust is increasingly used in environments where security and compliance are non-negotiable, including:

• Infrastructure services handling sensitive communications
• Security-focused tooling and platforms
• High-performance backend systems in regulated industries

If cryptographic operations occur outside a validated boundary, organizations may face:

• Compliance failures during audits
• Increased risk exposure
• Difficulty proving adherence to regulatory standards

Because Rust places control in developers' hands, ensuring consistent cryptographic behavior across teams and projects is a nontrivial task.

A Practical Path Forward: CryptoComply Core

The key to achieving FIPS compliance in Rust environments is to standardize the cryptographic backend.

SafeLogic’s CryptoComply Core provides:

• Drop-in FIPS 140-validated cryptographic software
• Compatibility with OpenSSL-based integrations
• A consistent, enforceable cryptographic foundation
• Support for Rust applications using OpenSSL-linked crates

By integrating CryptoComply Core, organizations can ensure that OpenSSL-based Rust applications are backed by validated cryptography.

Simplifying Compliance Without Sacrificing Flexibility

Rust’s flexibility doesn’t have to be a barrier to compliance; it just requires the right controls.

By focusing on dependency selection and environment configuration:

• OpenSSL-based crates can link directly to a validated module
• FIPS mode can be explicitly enabled and enforced
• Teams can standardize on an approved cryptographic backend
• Compliance becomes a matter of configuration, not code redesign

This approach allows organizations to preserve Rust’s advantages while introducing the consistency required for regulated environments.

What About Native Rust Crypto Libraries?

A key consideration in Rust ecosystems is the use of native cryptographic libraries.

While these libraries can offer performance and portability benefits:

• They often do not rely on OpenSSL
• They cannot leverage FIPS-validated modules
• They may operate entirely outside compliance boundaries

To address this, organizations should:

• Define approved cryptographic libraries and crates
• Restrict or audit dependencies that bypass validated modules
• Establish build and review processes that enforce compliance requirements

Managing these dependencies is essential to maintaining a consistent cryptographic posture.

A Practical Bridge to Compliance

Rust provides powerful tools for building secure and efficient systems, but it also introduces variability in how cryptography is implemented.

A practical approach to FIPS compliance includes:

1. Standardizing on OpenSSL-based cryptographic crates
2. Linking those crates to a FIPS-validated module
3. Controlling dependency usage across development teams

This creates a scalable path to compliance that aligns with Rust’s modular and dependency-driven ecosystem.

Final Thoughts

Rust is redefining modern systems programming, but it does not enforce a single cryptographic model.

For organizations navigating FIPS 140 requirements, success depends on:

1. Understanding how cryptography is introduced through dependencies
2. Ensuring those dependencies use validated modules
3. Establishing governance over the broader ecosystem

With solutions like CryptoComply Core, organizations can bring consistency, compliance, and confidence to their Rust applications without compromising the performance and safety that make Rust so compelling.