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Simplify decrypt packet len function #128

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Merged
nyonson merged 1 commit into from
Jul 9, 2025
Merged

Simplify decrypt packet len function #128

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15 changes: 6 additions & 9 deletions protocol/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -442,15 +442,12 @@ impl InboundCipher {
/// # Returns
///
/// The length of the rest of the packet.
pub fn decrypt_packet_len(&mut self, len_bytes: [u8; 3]) -> usize {
let mut enc_content_len = [0u8; 3];
enc_content_len.copy_from_slice(&len_bytes);
self.length_cipher.crypt(&mut enc_content_len);
let mut content_slice = [0u8; 4];
content_slice[0..3].copy_from_slice(&enc_content_len);
let content_len = u32::from_le_bytes(content_slice);

content_len as usize + NUM_HEADER_BYTES + NUM_TAG_BYTES
pub fn decrypt_packet_len(&mut self, mut len_bytes: [u8; NUM_LENGTH_BYTES]) -> usize {
self.length_cipher.crypt(&mut len_bytes);

u32::from_le_bytes([len_bytes[0], len_bytes[1], len_bytes[2], 0]) as usize
+ NUM_HEADER_BYTES
+ NUM_TAG_BYTES
}

/// Calculate the required decryption buffer length from packet length.
Expand Down