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//! Key exchange traits.

use zeroize::Zeroize;

use super::key::{PublicKey, SharedSecretKey};

/// Diffie-Hellman key exchange.
pub trait DiffieHellman: Zeroize {
    type SSK: SharedSecretKey;
    type PK: PublicKey;

    /// Derives `SharedSecretKey` from the other `PublicKey`
    fn diffie_hellman(&self, peer_public: &Self::PK) -> Self::SSK;
}