INNER CODE UNIT · Rust

create_check_code

matrix-org/vodozemac · src/ecies/mod.rs:325

    fn create_check_code(
        shared_secret: &SharedSecret,
        our_public_key: Curve25519PublicKey,
        their_public_key: Curve25519PublicKey,
        info: &str,
        role: Role,
    ) -> CheckCode {
        let mut bytes = [0u8; 2];
        let kdf: Hkdf<Sha512> = Hkdf::new(None, shared_secret.as_bytes());

        let info = Self::get_check_code_info(info, role, our_public_key, their_public_key);

        #[allow(clippy::expect_used)]
        kdf.expand(info.as_bytes(), bytes.as_mut_slice()).expect(
            "We should be able to expand the 32-byte long shared secret into a 32 byte key.",
        );

        CheckCode { bytes }

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