fn export_key_aes( format: KeyFormat, key: &CryptoKey, ) -> Result<ExportedKey, Error>
Helper function for https://w3c.github.io/webcrypto/#aes-ctr-operations-export-key https://w3c.github.io/webcrypto/#aes-cbc-operations-export-key https://w3c.github.io/webcrypto/#aes-gcm-operations-export-key https://w3c.github.io/webcrypto/#aes-kw-operations-export-key