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use num_bigint::RandBigInt;
use serde_derive::{Deserialize, Serialize};
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DHKeyPair {
pub p: num_bigint::BigUint,
pub g: num_bigint::BigUint,
pub pubkey: num_bigint::BigUint,
#[serde(skip)]
privkey: Option<num_bigint::BigUint>,
}
impl DHKeyPair {
pub fn new(p: num_bigint::BigUint, g: num_bigint::BigUint) -> DHKeyPair {
let privkey = rand::thread_rng().gen_biguint_below(&p);
let pubkey = g.modpow(&privkey, &p);
DHKeyPair {
p,
g,
pubkey,
privkey: Some(privkey),
}
}
pub fn key_exchange(
&self,
other_pubkey: &num_bigint::BigUint,
) -> num_bigint::BigUint {
other_pubkey.modpow(self.privkey.as_ref().unwrap(), &self.p)
}
}
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