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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| use aes::cipher::{KeyIvInit, StreamCipher}; | ||
| use sha2::{Digest, Sha256}; | ||
| use tokio_util::{bytes::{Buf, Bytes, BytesMut}, codec::{Decoder, Encoder}}; | ||
|
|
||
| use crate::{AdnlAesParams, AdnlError}; | ||
|
|
||
| use super::AdnlAes; | ||
|
|
||
| pub struct AdnlCodec { | ||
| aes_rx: AdnlAes, | ||
| aes_tx: AdnlAes, | ||
| last_readed_length: Option<usize>, | ||
| } | ||
|
|
||
| impl AdnlCodec { | ||
| pub fn new(aes_params: &AdnlAesParams) -> Self { | ||
| Self { | ||
| aes_rx: AdnlAes::new(aes_params.rx_key().into(), aes_params.rx_nonce().into()), | ||
| aes_tx: AdnlAes::new(aes_params.tx_key().into(), aes_params.tx_nonce().into()), | ||
| last_readed_length: None, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl Decoder for AdnlCodec { | ||
| type Item = Bytes; | ||
|
|
||
| type Error = AdnlError; | ||
|
|
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| fn decode(&mut self, src: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> { | ||
| let length = if let Some(length) = self.last_readed_length { | ||
| length | ||
| } else { | ||
| if src.len() < 4 { | ||
| return Ok(None) | ||
| } | ||
| self.aes_rx.apply_keystream(&mut src[..4]); | ||
| let mut length_bytes = [0u8; 4]; | ||
| length_bytes.copy_from_slice(&src[..4]); | ||
| let length = u32::from_le_bytes(length_bytes) as usize; | ||
| if length < 64 { | ||
| return Err(AdnlError::TooShortPacket); | ||
| } | ||
| if length > (1 << 24) { | ||
| return Err(AdnlError::TooLongPacket); | ||
| } | ||
| src.advance(4); | ||
| self.last_readed_length = Some(length); | ||
| length | ||
| }; | ||
|
|
||
| // not enough bytes, need to wait for more data | ||
| if src.len() < length { | ||
| if src.capacity() < length { | ||
| src.reserve(length - src.capacity()); | ||
| } | ||
| return Ok(None) | ||
| } | ||
|
|
||
| self.last_readed_length = None; | ||
|
|
||
| // decode packet | ||
| self.aes_rx.apply_keystream(&mut src[..length]); | ||
| let given_hash = &src[length-32..length]; | ||
|
|
||
| // integrity check | ||
| let mut hasher = Sha256::new(); | ||
| hasher.update(&src[..length-32]); | ||
| if given_hash != hasher.finalize().as_slice() { | ||
| return Err(AdnlError::IntegrityError) | ||
| } | ||
|
|
||
| // copy and return buffer | ||
| let result = Bytes::copy_from_slice(&src[32..length-32]); | ||
| src.advance(length); | ||
| Ok(Some(result)) | ||
| } | ||
| } | ||
|
|
||
| impl Encoder<Bytes> for AdnlCodec { | ||
| type Error = AdnlError; | ||
|
|
||
| fn encode(&mut self, buffer: Bytes, dst: &mut BytesMut) -> Result<(), Self::Error> { | ||
| if buffer.len() > ((1 << 24) - 64) { | ||
| return Err(AdnlError::TooLongPacket); | ||
| } | ||
| let length = ((buffer.len() + 64) as u32).to_le_bytes(); | ||
| let nonce = rand::random::<[u8; 32]>(); | ||
| let mut hash = Sha256::new(); | ||
| hash.update(&nonce); | ||
| hash.update(&buffer); | ||
| let hash = hash.finalize(); | ||
| dst.reserve(buffer.len() + 68); | ||
| dst.extend_from_slice(&length); | ||
| dst.extend_from_slice(&nonce); | ||
| dst.extend_from_slice(&buffer); | ||
| dst.extend_from_slice(&hash); | ||
| let start_offset = dst.len() - buffer.len() - 68; | ||
| self.aes_tx.apply_keystream(&mut dst[start_offset..]); | ||
| Ok(()) | ||
| } | ||
| } |
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