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#[cfg(all(feature = "digest", feature = "sha2"))]
use digest::Input;
#[cfg(all(feature = "digest", feature = "sha2"))]
use sha2::{Sha256, Sha384, Sha512};

#[cfg(all(feature = "digest", feature = "sha2"))]
use super::DigestSigner;
use error::Error;
use signature::Signature;

// TODO: define these using a macro?

/// Signer which computes SHA-256 digests of messages
pub trait Sha256Signer<S>: Send + Sync
where
    S: Signature,
{
    /// Compute a signature of the SHA-256 digest of a message
    fn sign_sha256(&self, msg: &[u8]) -> Result<S, Error>;
}

#[cfg(all(feature = "digest", feature = "sha2"))]
impl<S, T> Sha256Signer<S> for T
where
    S: Signature,
    T: DigestSigner<Sha256, S>,
{
    fn sign_sha256(&self, msg: &[u8]) -> Result<S, Error> {
        let mut sha256 = Sha256::default();
        sha256.process(msg);
        self.sign(sha256)
    }
}

/// Signer which computes SHA-384 digests of messages
pub trait Sha384Signer<S>: Send + Sync
where
    S: Signature,
{
    /// Compute a signature of the SHA-384 digest of a message
    fn sign_sha384(&self, msg: &[u8]) -> Result<S, Error>;
}

#[cfg(all(feature = "digest", feature = "sha2"))]
impl<S, T> Sha384Signer<S> for T
where
    S: Signature,
    T: DigestSigner<Sha384, S>,
{
    fn sign_sha384(&self, msg: &[u8]) -> Result<S, Error> {
        let mut sha384 = Sha384::default();
        sha384.process(msg);
        self.sign(sha384)
    }
}

/// Signer which computes SHA-512 digests of messages
pub trait Sha512Signer<S>: Send + Sync
where
    S: Signature,
{
    /// Compute a signature of the SHA-512 digest of a message
    fn sign_sha512(&self, msg: &[u8]) -> Result<S, Error>;
}

#[cfg(all(feature = "digest", feature = "sha2"))]
impl<S, T> Sha512Signer<S> for T
where
    S: Signature,
    T: DigestSigner<Sha512, S>,
{
    fn sign_sha512(&self, msg: &[u8]) -> Result<S, Error> {
        let mut sha512 = Sha512::default();
        sha512.process(msg);
        self.sign(sha512)
    }
}

/// Compute SHA-256 of the given message and then sign the resulting digest.
/// This can be used to avoid importing the `Signer` and `Signature` traits
pub fn sign_sha256<S>(signer: &Sha256Signer<S>, msg: &[u8]) -> Result<S, Error>
where
    S: Signature,
{
    signer.sign_sha256(msg)
}

/// Compute SHA-384 of the given message and then sign the resulting digest.
/// This can be used to avoid importing the `Signer` and `Signature` traits
pub fn sign_sha384<S>(signer: &Sha384Signer<S>, msg: &[u8]) -> Result<S, Error>
where
    S: Signature,
{
    signer.sign_sha384(msg)
}

/// Compute SHA-512 of the given message and then sign the resulting digest.
/// This can be used to avoid importing the `Signer` and `Signature` traits
pub fn sign_sha512<S>(signer: &Sha512Signer<S>, msg: &[u8]) -> Result<S, Error>
where
    S: Signature,
{
    signer.sign_sha512(msg)
}