函数 verify_tls13_signature_with_raw_key 

pub fn verify_tls13_signature_with_raw_key(
    msg: &[u8],
    spki: &SubjectPublicKeyInfoDer<'_>,
    dss: &DigitallySignedStruct,
    supported_schemes: &WebPkiSupportedAlgorithms,
) -> Result<HandshakeSignatureValid, Error>

验证 一个 message signature using 一个 raw 公钥 并 the first TLS 1.3 compatible supported scheme.