// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. // Copyright by contributors to this project. // SPDX-License-Identifier: (Apache-2.0 OR MIT)
use mls_rs_core::{
crypto::{HpkePublicKey, HpkeSecretKey},
error::IntoAnyError,
};
/// Generate a fresh key pair. This is the only place where randomness is used in this /// module. The function could be implemented in the same way as `derive` with random /// `ikm`, but it could also be implemented directly with a crypto provider like OpenSSL. asyncfn generate(&self) -> Result<(HpkeSecretKey, HpkePublicKey), Self::Error>;
/// Outputs the public key corresponding to the given secret key bytes. If the secret /// key is malformed, the function should return an error. asyncfn to_public(&self, secret_key: &HpkeSecretKey) -> Result<HpkePublicKey, Self::Error>;
/// If the output is `Some(bitmask)`, then the `Kem::derive` function will generate /// the secret key by rejection sampling over random byte sequences with `bitmask` /// applied to the most significant byte. /// /// Typical outputs for ECDH are: /// * `None` for curves 25519 and X448 (no rejection sampling is needed), /// * `Some(0x01)` for curve P-521 (all bits of the first byte except the least /// significant one are filtered out), /// * `Some(0xFF)`for curves P-256 and P-384 (rejection sampling is needed but no /// bits need to be filtered). fn bitmask_for_rejection_sampling(&self) -> SamplingMethod;
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