refactor(rust/trezor-thp): type aliases

diff --git a/rust/trezor-thp/examples/host-cli/main.rs b/rust/trezor-thp/examples/host-cli/main.rs
index a15e7264..cf3c11a6 100644
--- a/rust/trezor-thp/examples/host-cli/main.rs
+++ b/rust/trezor-thp/examples/host-cli/main.rs
@@ -6,8 +6,8 @@ use std::{env, net::SocketAddr, str::FromStr};
 use protobuf::Message;
 
 use trezor_thp::{
-    Backend, Channel, Host,
-    channel::host::{ChannelOpen, Mux},
+    Backend,
+    channel::host::{Channel, ChannelOpen, Mux},
     credential::{CredentialStore, NullCredentialStore},
 };
 
@@ -29,7 +29,7 @@ impl Backend for RustCrypto {
     }
 }
 
-type HostChannel = Channel<Host, RustCrypto>;
+type HostChannel = Channel<RustCrypto>;
 
 fn do_allocation(client: &mut Client<Mux<RustCrypto>>) {
     client.call(0, &[]);
@@ -87,7 +87,7 @@ fn do_pairing_skip(client: &mut Client<HostChannel>) {
     );
 }
 
-fn do_ping(client: &mut Client<Channel<Host, RustCrypto>>) {
+fn do_ping(client: &mut Client<HostChannel>) {
     let mut ping = Ping::new();
     ping.set_message("trezor-thp/examples".into());
     ping.set_button_protection(true);
diff --git a/rust/trezor-thp/src/channel/device.rs b/rust/trezor-thp/src/channel/device.rs
index e19ddf62..64072874 100644
--- a/rust/trezor-thp/src/channel/device.rs
+++ b/rust/trezor-thp/src/channel/device.rs
@@ -1,7 +1,7 @@
 use heapless;
 
 use crate::{
-    Backend, Channel, ChannelIO, Device, Error,
+    Backend, ChannelIO, Device, Error,
     alternating_bit::SyncBits,
     channel::{
         ChannelState, Nonce, PRIVKEY_LEN, PacketInResult, PairingState, noise::NoiseHandshake,
@@ -33,6 +33,8 @@ const BROADCAST_OUTGOING_QUEUE_LEN: usize = 8;
 // "?##" + Failure message type + msg_size + msg_data (code = "Failure_InvalidProtocol")
 const CODEC_V1_RESPONSE: &[u8] = b"?##\x00\x03\x00\x00\x00\x02\x08\x11";
 
+pub type Channel<B> = super::Channel<Device, B>;
+
 /// Maps packets to channels. Handles broadcast channel messages, notably channel allocation.
 /// Every packet interface on the device needs to have one Mux. Event loop should pass every
 /// incoming packet to [`Mux::packet_in`] in order to determine what to do with it.
@@ -285,7 +287,7 @@ enum HandshakeState {
 /// Please note that this object also handles sending ChannelAllocationResponse
 /// which is a broadcast message, which are normally handled by [`Mux`].
 pub struct ChannelOpen<C: CredentialVerifier, B: Backend> {
-    channel: Channel<Device, B>,
+    channel: Channel<B>,
     state: HandshakeState,
     noise: NoiseHandshake<Device, B>,
     internal_buffer: heapless::Vec<u8, INTERNAL_BUFFER_LEN>,
@@ -421,7 +423,7 @@ impl<C: CredentialVerifier, B: Backend> ChannelOpen<C, B> {
     ///
     /// [Pairing phase]: https://docs.trezor.io/trezor-firmware/common/thp/specification.html#pairing-phase
     /// [Credential phase]: https://docs.trezor.io/trezor-firmware/common/thp/specification.html#credential-phase
-    pub fn complete(self) -> Result<Channel<Device, B>, Error> {
+    pub fn complete(self) -> Result<Channel<B>, Error> {
         if self.channel.noise.is_none() {
             return Err(Error::unexpected_input());
         }
diff --git a/rust/trezor-thp/src/channel/host.rs b/rust/trezor-thp/src/channel/host.rs
index 4584ad16..a191c70b 100644
--- a/rust/trezor-thp/src/channel/host.rs
+++ b/rust/trezor-thp/src/channel/host.rs
@@ -1,7 +1,7 @@
 use heapless;
 
 use crate::{
-    Backend, Channel, ChannelIO, Error, Host,
+    Backend, ChannelIO, Error, Host,
     alternating_bit::SyncBits,
     channel::{ChannelState, Nonce, PacketInResult, PairingState, noise::NoiseHandshake},
     credential::CredentialStore,
@@ -22,6 +22,8 @@ use core::marker::PhantomData;
 const INTERNAL_BUFFER_LEN: usize = 192;
 const MAX_DEVICE_PROPERTIES_LEN: usize = 128;
 
+pub type Channel<B> = super::Channel<Host, B>;
+
 enum AllocationState {
     None,
     SendingRequest {
@@ -331,7 +333,7 @@ enum HandshakeState {
 /// - perform [`ChannelIO`] with empty messages until [`ChannelOpen::handshake_done`]
 /// - call [`ChannelOpen::complete`] to obtain [`Channel`]
 pub struct ChannelOpen<C: CredentialStore, B: Backend> {
-    channel: Channel<Host, B>,
+    channel: Channel<B>,
     state: HandshakeState,
     noise: NoiseHandshake<Host, B>,
     internal_buffer: heapless::Vec<u8, INTERNAL_BUFFER_LEN>,
@@ -463,7 +465,7 @@ impl<C: CredentialStore, B: Backend> ChannelOpen<C, B> {
     ///
     /// [Pairing phase]: https://docs.trezor.io/trezor-firmware/common/thp/specification.html#pairing-phase
     /// [Credential phase]: https://docs.trezor.io/trezor-firmware/common/thp/specification.html#credential-phase
-    pub fn complete(self) -> Result<Channel<Host, B>, Error> {
+    pub fn complete(self) -> Result<Channel<B>, Error> {
         if self.channel.noise.is_none() {
             return Err(Error::unexpected_input());
         }
diff --git a/rust/trezor-thp/src/lib.rs b/rust/trezor-thp/src/lib.rs
index 56d62752..edd42338 100644
--- a/rust/trezor-thp/src/lib.rs
+++ b/rust/trezor-thp/src/lib.rs
@@ -12,7 +12,7 @@ mod fragment;
 pub mod header;
 mod util;
 
-pub use channel::{Backend, Channel, ChannelIO};
+pub use channel::{Backend, ChannelIO};
 pub use error::Error;
 
 pub trait Role: Clone + PartialEq {