init

    fn init(
        cert_pub_key: *CertificatePublicKey,
        algo: Certificate.AlgorithmCategory,
        pub_key: []const u8,
    ) error{CertificatePublicKeyInvalid}!void {
        if (pub_key.len > cert_pub_key.buf.len) return error.CertificatePublicKeyInvalid;
        cert_pub_key.algo = algo;
        @memcpy(cert_pub_key.buf[0..pub_key.len], pub_key);
        cert_pub_key.len = @intCast(pub_key.len);
    }