quantum_cryptographic_toolkit 0.2.0

// src/algorithms/newhope.rs

/// NewHope cryptographic algorithm implementation.
///
/// NewHope is a lattice-based key exchange algorithm that provides post-quantum security.
/// This implementation is designed for simplicity and clarity, while demonstrating
/// the core concepts of the algorithm.

pub struct NewHope {
    pub key: Vec<u8>,
}

impl NewHope {
    /// Initializes a new NewHope instance with a generated key.
    ///
    /// This constructor generates an example key for demonstration purposes.
    /// In a real-world scenario, proper key generation logic should be implemented.
    pub fn new() -> Self {
        NewHope {
            key: vec![0; 32], // Placeholder key
        }
    }

    /// Simulates the key exchange process using the NewHope algorithm.
    ///
    /// # Arguments
    ///
    /// * `public_key` - A byte slice representing the public key.
    ///
    /// # Returns
    ///
    /// A vector of bytes representing the shared secret.
    pub fn exchange(&self, public_key: &[u8]) -> Vec<u8> {
        self.simple_transform(public_key, |x| x.wrapping_add(1))
    }

    /// A simple transformation function used for key exchange.
    ///
    /// This function applies a transformation to each byte in the input data.
    ///
    /// # Arguments
    ///
    /// * `data` - A byte slice representing the data to be transformed.
    /// * `f` - A function that defines the transformation to be applied to each byte.
    ///
    /// # Returns
    ///
    /// A vector of bytes representing the transformed data.
    fn simple_transform<F>(&self, data: &[u8], f: F) -> Vec<u8>
    where
        F: Fn(u8) -> u8,
    {
        data.iter().map(|&x| f(x)).collect()
    }
}

impl Default for NewHope {
    fn default() -> Self {
        Self::new()
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_newhope_key_exchange() {
        let newhope = NewHope::new();
        let public_key = vec![1, 2, 3, 4];
        let shared_secret = newhope.exchange(&public_key);
        assert_eq!(shared_secret.len(), public_key.len());
    }
}