/*
pub struct X59Cert {
pub version: u8,
pub serial_number: u64,
pub signature_algorithm: String,
pub issuer: String,
pub validity: Validity,
pub subject: String,
pub subject_public_key_info: SubjectPublicKeyInfo,
pub issuer_unique_id: Option<Vec<u8>>,
pub subject_unique_id: Option<Vec<u8>>,
pub extensions: Option<Vec<Extension>>,
}
*/