s2n-quic-ring 0.1.0

Internal crate used by s2n-quic
Documentation 
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

use core::fmt;
use ring::aead;
use s2n_quic_core::crypto::{self, HeaderProtectionMask};

pub struct HeaderKey(pub(crate) aead::quic::HeaderProtectionKey);

impl crypto::HeaderKey for HeaderKey {
    #[inline]
    fn opening_header_protection_mask(&self, sample: &[u8]) -> HeaderProtectionMask {
        self.header_protection_mask(sample)
    }

    #[inline]
    fn opening_sample_len(&self) -> usize {
        self.0.algorithm().sample_len()
    }

    #[inline]
    fn sealing_header_protection_mask(&self, sample: &[u8]) -> HeaderProtectionMask {
        self.header_protection_mask(sample)
    }

    #[inline]
    fn sealing_sample_len(&self) -> usize {
        self.0.algorithm().sample_len()
    }
}

impl HeaderKey {
    #[inline]
    fn header_protection_mask(&self, sample: &[u8]) -> HeaderProtectionMask {
        self.0
            .new_mask(sample)
            .expect("sample length already checked")
    }
}

impl fmt::Debug for HeaderKey {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("HeaderKey").finish()
    }
}

#[derive(Debug)]
pub struct HeaderKeyPair {
    pub(crate) sealer: HeaderKey,
    pub(crate) opener: HeaderKey,
}

impl crypto::HeaderKey for HeaderKeyPair {
    #[inline]
    fn opening_header_protection_mask(&self, sample: &[u8]) -> HeaderProtectionMask {
        self.opener.opening_header_protection_mask(sample)
    }

    #[inline]
    fn opening_sample_len(&self) -> usize {
        self.opener.opening_sample_len()
    }

    #[inline]
    fn sealing_header_protection_mask(&self, sample: &[u8]) -> HeaderProtectionMask {
        self.sealer.sealing_header_protection_mask(sample)
    }

    #[inline]
    fn sealing_sample_len(&self) -> usize {
        self.sealer.sealing_sample_len()
    }
}

macro_rules! header_key {
    ($name:ident) => {
        #[derive(Debug)]
        pub struct $name(crate::header_key::HeaderKeyPair);

        impl s2n_quic_core::crypto::HeaderKey for $name {
            #[inline]
            fn opening_header_protection_mask(
                &self,
                sample: &[u8],
            ) -> s2n_quic_core::crypto::HeaderProtectionMask {
                self.0.opening_header_protection_mask(sample)
            }

            #[inline]
            fn opening_sample_len(&self) -> usize {
                self.0.opening_sample_len()
            }

            #[inline]
            fn sealing_header_protection_mask(
                &self,
                sample: &[u8],
            ) -> s2n_quic_core::crypto::HeaderProtectionMask {
                self.0.sealing_header_protection_mask(sample)
            }

            #[inline]
            fn sealing_sample_len(&self) -> usize {
                self.0.sealing_sample_len()
            }
        }
    };
}