Crate alvan_lic 

alvan-lic

A Rust crate for generating and validating time-based license keys with offline validation.

Features

• Generate license keys with custom expiration times
• Validate license keys offline using HMAC
• Keys always start with “alvan-”
• Secure against tampering using cryptographic signatures

Example

use alvan_lic::{LicenseGenerator, LicenseValidator};

// Create a generator with your secret key
let secret_key = "your-super-secret-key";
let generator = LicenseGenerator::new(secret_key);

// Generate a license valid for 24 hours
let license_key = generator.generate_key(24).unwrap();
println!("Generated license: {}", license_key);

// Validate the license
let validator = LicenseValidator::new(secret_key);
match validator.validate_key(&license_key) {
    Ok(info) => println!("License is valid until: {}", info.expires_at),
    Err(e) => println!("License validation failed: {}", e),
}

Structs

LicenseGenerator

License key generator that creates time-based license keys

LicenseInfo

Information about a validated license

LicenseValidator

License key validator for offline validation

Enums

LicenseError

Errors that can occur during license generation or validation

Constants

LICENSE_PREFIX

The prefix for all license keys

Type Aliases

Result

Result type alias for license operations