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//! Trait for verifying digital signatures

#[cfg(feature = "digest")]
use crate::digest::Digest;
use crate::{error::Error, Signature};

/// Verify the provided message bytestring using `Self` (e.g. a public key)
pub trait Verifier<S: Signature> {
    /// Use `Self` to verify that the provided signature for a given message
    /// bytestring is authentic.
    ///
    /// Returns `Error` if it is inauthentic, or otherwise returns `()`.
    fn verify(&self, msg: &[u8], signature: &S) -> Result<(), Error>;
}

/// Verify the provided signature for the given prehashed message `Digest`
/// is authentic.
#[cfg(feature = "digest")]
pub trait DigestVerifier<D, S>
where
    D: Digest,
    S: Signature,
{
    /// Verify the signature against the given `Digest` output.
    fn verify_digest(&self, digest: D, signature: &S) -> Result<(), Error>;
}