latticearc

LatticeArc is a post-quantum cryptography library for Rust that implements all four NIST PQC standards (FIPS 203–206) with a FIPS 140-3 validated backend. It ships as one library crate with a use-case-driven API — you describe what you're protecting, the library selects the right algorithm, security level, and compliance mode automatically. Hybrid (PQ + classical) by default for defense-in-depth, with PQ-only mode available for CNSA 2.0.

Why LatticeArc?

Quick Start

[dependencies]
latticearc = "0.6"

Hybrid Encryption (Recommended)

use latticearc::{encrypt, decrypt, CryptoConfig, EncryptKey, DecryptKey};

// ML-KEM-768 + X25519 + HKDF-SHA256 + AES-256-GCM — selected automatically
let (pk, sk) = latticearc::generate_hybrid_keypair()?;
let encrypted = encrypt(b"patient records", EncryptKey::Hybrid(&pk), CryptoConfig::new())?;
let decrypted = decrypt(&encrypted, DecryptKey::Hybrid(&sk), CryptoConfig::new())?;

PQ-Only Encryption (CNSA 2.0)

use latticearc::{encrypt, decrypt, CryptoConfig, CryptoMode, EncryptKey, DecryptKey};

// ML-KEM-768 + HKDF-SHA256 + AES-256-GCM — no classical component
let (pk, sk) = latticearc::generate_pq_keypair()
    .map_err(|e| Box::new(e) as Box<dyn std::error::Error>)?;
let config = CryptoConfig::new().crypto_mode(CryptoMode::PqOnly);
let encrypted = encrypt(b"classified", EncryptKey::PqOnly(&pk), config.clone())?;
let decrypted = decrypt(&encrypted, DecryptKey::PqOnly(&sk), config)?;

Digital Signatures

use latticearc::{generate_signing_keypair, sign_with_key, verify, CryptoConfig};

// ML-DSA-65 + Ed25519 hybrid signature
let config = CryptoConfig::new();
let (pk, sk, _scheme) = generate_signing_keypair(config.clone())?;
let signed = sign_with_key(b"contract.pdf", &sk, &pk, config.clone())?;
assert!(verify(&signed, config)?);

Use Case Selection

use latticearc::{encrypt, CryptoConfig, UseCase, EncryptKey};

// Library selects ML-KEM-1024 + X25519 for government classified data
let (pk, _sk) = latticearc::generate_hybrid_keypair()?;
let encrypted = encrypt(b"data", EncryptKey::Hybrid(&pk),
    CryptoConfig::new().use_case(UseCase::GovernmentClassified))?;

Configuration

Two orthogonal axes control algorithm selection:

CryptoConfig::new()
    .use_case(UseCase::FileStorage)       // what you're protecting (22 use cases)
    .crypto_mode(CryptoMode::PqOnly)      // hybrid or PQ-only
    .security_level(SecurityLevel::High)  // NIST level 1/3/5
    .compliance(ComplianceMode::Fips140_3) // regulatory requirements
    .session(&session)                    // optional zero-trust verification

Security Levels

Compliance Modes

What's Included

CLI

A companion CLI tool is available for key generation, signing, encryption, and hashing — no code required:

cargo install --path latticearc-cli

# Use-case-driven signing
latticearc-cli keygen --use-case legal-documents --output ./keys
latticearc-cli sign --input contract.pdf \
  --key keys/hybrid-ml-dsa-87-ed25519.sec.json \
  --public-key keys/hybrid-ml-dsa-87-ed25519.pub.json

# PQ-only encryption
latticearc-cli keygen --algorithm ml-kem768 --output ./keys
latticearc-cli encrypt --mode pq-only --key keys/ml-kem-768.pub.json --input secret.pdf

See latticearc-cli/README.md for the full command reference.

Key Format

Keys use the LatticeArc Portable Key (LPK) format — dual JSON + CBOR, identified by use case or security level:

let (pk, sk) = latticearc::generate_hybrid_keypair()?;
let (portable_pk, portable_sk) =
    PortableKey::from_hybrid_kem_keypair(UseCase::FileStorage, &pk, &sk)?;

let json = portable_pk.to_json()?;   // human-readable
let cbor = portable_pk.to_cbor()?;   // compact binary

See docs/KEY_FORMAT.md for the full specification.

Security

• Zero unsafe code
• Constant-time comparisons via subtle
• Automatic secret zeroization via Zeroize
• CAVP test vector validation
• 27 Kani formal verification proofs
• Opaque AEAD error messages (SP 800-38D)

Feature Flags

Documentation

• API Reference
• CLI Reference
• Unified API Guide
• Key Format Specification
• Architecture
• Security Guide
• NIST Compliance

License

Apache-2.0