//! Digests and XOFs used to implement the Tor protocol.

//!

//! In various places, for legacy reasons, Tor uses SHA1, SHA2, SHA3,

//! and SHAKE.  We re-export them all here, in forms implementing the

//! the [`digest::Digest`] traits.

//!

//! Other code should access these digests via the traits in the

//! [`digest`] crate.

#[cfg(feature = "with-openssl")]

pub use openssl_compat::Sha1;

#[cfg(not(feature = "with-openssl"))]

pub use sha1::Sha1;

pub use sha2::{Sha256, Sha512};

pub use sha3::{Sha3_256, Shake128, Shake256, Shake256Reader};

/// Compatibility layer between OpenSSL and `digest`

#[cfg(feature = "with-openssl")]

mod openssl_compat {

    use openssl::sha::Sha1 as OpenSslSha1;

    use digest::{FixedOutput, HashMarker, Output, OutputSizeUser, Update};

    /// Wrapper around OpenSSL Sha1 to make it compatible with `digest`

    #[derive(Default, Clone)]

    pub struct Sha1(OpenSslSha1);

    impl Update for Sha1 {

    }

    impl OutputSizeUser for Sha1 {

        type OutputSize = typenum::consts::U20;

    }

    impl FixedOutput for Sha1 {

    }

    impl HashMarker for Sha1 {}

}