pub fn parse_keys(p256dh: &str, auth: &str) -> Result<(String, String), String>Expand description
The subscription’s public key and secret (base64url, padded or not),
in the form they are stored: base64url without padding, so delivery
decodes them one way. Err unless they are a P-256 point, uncompressed,
and 16 bytes (RFC 8291 §3.2).