Function rfc9421_verify 

pub fn rfc9421_verify<B, F>(
    req: &Request<B>,
    resolve_key: F,
) -> Result<Rfc9421Verified, Error>
where
    F: FnMut(&str) -> Result<VerifyingKey, Error>,

Verifies an RFC 9421-signed request against a key returned by resolve_key(key_id).

When multiple labels are present, this function picks the first label whose key the resolver accepts and returns its report. If the resolver fails for every label the last error is returned.

Errors

Returns Error::MissingHeader if either header is absent, and Error::VerificationFailed if no label produces a valid signature. See also Error::MalformedSignatureHeader and Error::KeyResolution.