rustls-rustcrypto-azul 0.1.0

Pure Rust cryptography provider for the Rustls TLS library using algorithm implementations from the RustCrypto organization (azul's fork of rustls-rustcrypto: the unreleased upstream master on the elliptic-curve 0.14 / crypto-bigint 0.7 generation, published so dependents need no [patch]; otherwise upstream's code) 
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use pki_types::{alg_id, AlgorithmIdentifier, InvalidSignature, SignatureVerificationAlgorithm};
use signature::Verifier;

#[derive(Debug)]
struct Ed25519Verify;

impl SignatureVerificationAlgorithm for Ed25519Verify {
    fn public_key_alg_id(&self) -> AlgorithmIdentifier {
        alg_id::ED25519
    }

    fn signature_alg_id(&self) -> AlgorithmIdentifier {
        alg_id::ED25519
    }

    fn verify_signature(
        &self,
        public_key: &[u8],
        message: &[u8],
        signature: &[u8],
    ) -> Result<(), InvalidSignature> {
        let public_key = public_key.try_into().map_err(|_| InvalidSignature)?;
        let signature =
            ed25519_dalek::Signature::from_slice(signature).map_err(|_| InvalidSignature)?;
        ed25519_dalek::VerifyingKey::from_bytes(public_key)
            .map_err(|_| InvalidSignature)?
            .verify(message, &signature)
            .map_err(|_| InvalidSignature)
    }
}

pub const ED25519: &dyn SignatureVerificationAlgorithm = &Ed25519Verify;