445     let pn_len = usize::from((first & PKT_NUM_MASK) + 1);  in decrypt_hdr()  localVariable
447     let ciphertext = &mut ciphertext[..pn_len];  in decrypt_hdr()
449     for i in 0..pn_len {  in decrypt_hdr()
454     let pn = match pn_len {  in decrypt_hdr()
471     hdr.pkt_num_len = pn_len;  in decrypt_hdr()
480 pub fn decode_pkt_num(largest_pn: u64, truncated_pn: u64, pn_len: usize) -> u64 {  in decode_pkt_num()
481     let pn_nbits = pn_len * 8;  in decode_pkt_num()
501     b: &'a mut octets::OctetsMut, pn: u64, pn_len: usize, payload_len: usize,  in decrypt_pkt()
509         .checked_sub(pn_len)  in decrypt_pkt()
521     b: &mut octets::OctetsMut, pn_len: usize, payload: &[u8], aead: &crypto::Seal,  in encrypt_hdr()
523     let sample = &payload[4 - pn_len..16 + (4 - pn_len)];  in encrypt_hdr()
537     let pn_buf = rest.slice_last(pn_len)?;  in encrypt_hdr()
538     for i in 0..pn_len {  in encrypt_hdr()
546     b: &mut octets::OctetsMut, pn: u64, pn_len: usize, payload_len: usize,  in encrypt_pkt()
555     encrypt_hdr(&mut header, pn_len, ciphertext, aead)?;  in encrypt_pkt()
1526         header: &mut [u8], dcid: &[u8], frames: &[u8], pn: u64, pn_len: usize,  in assert_encrypt_initial_pkt()
1552             encrypt_pkt(&mut b, pn, pn_len, payload_len, payload_offset, &aead)  in assert_encrypt_initial_pkt()
2153         let pn_len = 3;  in encrypt_chacha20()  localVariable
2166             encrypt_pkt(&mut b, pn, pn_len, payload_len, payload_offset, &aead)  in encrypt_chacha20()