Function seec_channel::sub_channel_with
source · pub async fn sub_channel_with<S, R, Msg, SubMsg>(
sender: &mut S,
receiver: &mut R,
local_buffer: usize,
wrap_fn: impl FnOnce(Sender<SubMsg>) -> Msg,
extract_fn: impl FnOnce(Msg) -> Option<Sender<SubMsg>>
) -> Result<(Sender<SubMsg>, Receiver<SubMsg>), CommunicationError>Examples found in repository?
crates/seec/examples/aes_cbc.rs (lines 156-165)
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async fn execute(args: &ExecuteArgs) -> Result<()> {
let (mut sender, bytes_written, mut receiver, bytes_read) = match args.id {
0 => seec_channel::tcp::listen(args.server).await?,
1 => seec_channel::tcp::connect(args.server).await?,
illegal => anyhow::bail!("Illegal party id {illegal}. Must be 0 or 1."),
};
let (mut main_channel, executor_channel) =
sub_channels_for!(&mut sender, &mut receiver, 8, Msg, Message<BooleanGmw>).await?;
let mut sharing = XorSharing::new(ChaChaRng::from_rng(thread_rng()).context("Sharing RNG")?);
let ot_channel = if args.insecure_setup.not() {
let sub_channel = sub_channel_with(
&mut main_channel.0,
&mut main_channel.1,
128,
Msg::OtChannel,
|msg| match msg {
Msg::OtChannel(sender) => Some(sender),
_ => None,
},
)
.await
.context("failed to create ot sub_channel")?;
Some(sub_channel)
} else {
None
};
match args.id {
0 => {
let key: [u8; 16] = hex::decode(&args.key)
.context("Decoding key")?
.try_into()
.ok()
.context("Key must be 16 bytes long")?;
let key: [usize; 2] = bytemuck::cast(key);
// Apparently, the AES circuit wants it's arguments in Msb format. However,
// the executor currently expects arguments to be in a BitVec with Lsb order.
// The following changes the order of the bits manyally
// TODO the following is likely wrong with the change to BitVec<usize>
let msb_key: BitVec<usize> = key.iter().map(|bytes| bytes.reverse_bits()).collect();
let iv = thread_rng().gen::<[usize; 2]>();
let msb_iv: BitVec<usize> = iv.iter().map(|bytes| bytes.reverse_bits()).collect();
let [key_share0, key_share1] = sharing.share(msb_key);
let [iv_share0, iv_share1] = sharing.share(msb_iv);
main_channel
.0
.send(Msg::ShareIvKey {
iv: iv_share1,
key: key_share1,
})
.await?;
let Msg::ShareInput(input_share) = main_channel
.1
.recv()
.await?
.ok_or(anyhow::anyhow!("Remote closed"))?
else {
anyhow::bail!("Received wrong message. Expected ShareInput")
};
let out = encrypt(
args,
executor_channel,
ot_channel,
&input_share,
&key_share0,
&iv_share0,
)
.await?;
main_channel
.0
.send(Msg::ReconstructAesCiphertext(out.clone()))
.await?;
if args.validate {
main_channel.0.send(Msg::PlainIvKey { iv, key }).await?;
}
// Try to recv Ack but ignore errors
let _ = main_channel.1.recv().await;
info!(
bytes_written = bytes_written.get(),
bytes_read = bytes_read.get(),
);
}
1 => {
let (data, padded_data) = get_data(args).context("Loading data to encrypt")?;
let mut padded_data_usize = vec![0_usize; padded_data.len() / mem::size_of::<usize>()];
bytemuck::cast_slice_mut(&mut padded_data_usize).clone_from_slice(&padded_data);
let padded_file_data = BitVec::from_vec(padded_data_usize);
let [input_share0, input_share1] = sharing.share(padded_file_data);
main_channel.0.send(Msg::ShareInput(input_share1)).await?;
let Msg::ShareIvKey {
iv: iv_share,
key: key_share,
} = main_channel
.1
.recv()
.await
.context("Receiving IvKeyShare")?
.ok_or(anyhow::anyhow!("Remote closed"))?
else {
anyhow::bail!("Received wrong message. Expected IvKeyShare")
};
let out = encrypt(
args,
executor_channel,
ot_channel,
&input_share0,
&key_share,
&iv_share,
)
.await?;
let Msg::ReconstructAesCiphertext(shared_out) = main_channel
.1
.recv()
.await
.context("Receiving ciphertext share")?
.ok_or(anyhow::anyhow!("Remote closed"))?
else {
anyhow::bail!("Received wrong message. Expected IvKeyShare")
};
let ciphertext = match (out, shared_out) {
(Output::Scalar(out), Output::Scalar(shared_out)) => {
XorSharing::<ThreadRng>::reconstruct([out, shared_out])
}
(Output::Simd(out), Output::Simd(shared_out)) => out
.into_iter()
.zip(shared_out)
.flat_map(|(a, b)| XorSharing::<ThreadRng>::reconstruct([a, b]))
.collect(),
_ => unreachable!("Non compatible output"),
};
if args.validate {
let Msg::PlainIvKey { iv, key } = main_channel
.1
.recv()
.await
.context("Reconstructing Iv/Key")?
.ok_or(anyhow::anyhow!("Remote closed"))?
else {
anyhow::bail!("Received wrong message. Expected ReconstructIvKey")
};
validate(iv, key, &data, &ciphertext)?;
}
main_channel.0.send(Msg::Ack).await?;
let encoded = hex::encode(bytemuck::cast_slice(ciphertext.as_raw_slice()));
info!(
bytes_written = bytes_written.get(),
bytes_read = bytes_read.get(),
ciphertext = encoded
);
}
_ => unreachable!(),
};
Ok(())
}