Crate ancaptcha 

anCaptcha: A No-JS, stateless captcha engine implemented in Rust for cross-language integration.

Originally designed for the darknet, specifically for Tor hidden services, to provide human verification without requiring JavaScript. It uses authenticated encryption (ChaCha20-Poly1305) to store challenge state in tokens, eliminating the need for server-side sessions.

(c) 2026 Maverick. Licensed under Apache License, Version 2.0.

Re-exports

pub use common::assets;

pub use common::error::AnCaptchaError;

pub use common::error::Result;

pub use config::CaptchaStyle;

pub use config::Config;

pub use config::Difficulty;

pub use config::Layout;

pub use config::NoiseIntensity;

pub use config::Theme;

pub use crypto::token::DEFAULT_TTL_SECONDS;

pub use engine::CaptchaRequest;

pub use engine::generate_full_captcha;

pub use storage::AssetCache;

pub use storage::get_cache;

pub use storage::init_cache;

pub use storage::init_with_intensity;

pub use verification::AnCaptcha;

pub use verification::CaptchaBundle;

pub use verification::PairSubmission;

pub use verification::RotateSubmission;

pub use verification::SliderSubmission;

pub use verification::generate_pair_bundle;

pub use verification::generate_rotate_bundle;

pub use verification::generate_slider_bundle;

pub use verification::verify_pair;

pub use verification::verify_rotate;

pub use verification::verify_slider;

Modules

common

Shared utilities for encoding, randomization, and type definitions.

config

Engine configuration and settings coordination.

crypto

Cryptographic operations for secure token management.

engine

Visual asset distortion and HTML/CSS generation engine.

storage

Thread-safe singleton for asset variation caching.

styles

Challenge-specific validation and solution checking logic.

verification

Submission handling and verification coordination.