keylight 0.1.0

Keylight licensing SDK — activate/validate licenses with offline Ed25519 lease verification.
Documentation 
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const BACKWARD_TOLERANCE: i64 = 3600; // 1h
const FORWARD_JUMP_LIMIT: i64 = 30 * 24 * 60 * 60; // 30d

/// True if the (last_seen, now) pair indicates clock tampering (parity with Swift).
pub fn clock_manipulated(last_seen: i64, now: i64) -> bool {
    let drift = last_seen - now; // positive => clock went backward
    if drift > BACKWARD_TOLERANCE {
        return true;
    }
    if now - last_seen > FORWARD_JUMP_LIMIT {
        return true;
    }
    false
}

#[cfg(test)]
mod tests {
    use super::*;
    #[test]
    fn normal_is_fine() {
        assert!(!clock_manipulated(1000, 1100));
    }
    #[test]
    fn backward_beyond_tolerance_flags() {
        assert!(clock_manipulated(10_000, 10_000 - 4000));
    }
    #[test]
    fn forward_beyond_30d_flags() {
        assert!(clock_manipulated(0, 31 * 24 * 60 * 60));
    }
}