Remove Arc<Mutex<>> attempts, rely on assuan::Client now being Send+Sync

openpgp-card-sequoia/src/lib.rs

@@ -24,7 +24,6 @@ use openpgp_card::{
     errors::OpenpgpCardError, CardAdmin, CardSign, CardUploadableKey,
     CardUser, EccKey, EccType, KeyType, PrivateKeyMaterial, RSAKey,
 };
-use std::sync::{Arc, Mutex};
 
 mod decryptor;
 mod signer;
@@ -291,7 +290,7 @@ pub fn decrypt(
 }
 
 pub fn sign(
-    ocu: Arc<Mutex<CardSign>>,
+    ocu: CardSign,
     cert: &sequoia_openpgp::Cert,
     input: &mut dyn io::Read,
 ) -> Result<String> {

openpgp-card-sequoia/src/main.rs

@@ -8,9 +8,8 @@ use anyhow::Result;
 use sequoia_openpgp::parse::Parse;
 use sequoia_openpgp::Cert;
 
-use openpgp_card::{CardBase, KeyType};
+use openpgp_card::KeyType;
 use openpgp_card_scdc::ScdClient;
-use std::sync::{Arc, Mutex};
 
 // Filename of test key and test message to use:
 
@@ -196,14 +195,14 @@ fn main() -> Result<(), Box<dyn Error>> {
 
         // Sign
         match oc.verify_pw1_for_signing("123456") {
-            Ok(mut oc_user) => {
+            Ok(oc_user) => {
                 println!("pw1 81 verify ok");
 
                 let cert = Cert::from_file(TEST_KEY_PATH)?;
 
                 let text = "Hello world, I am signed.";
                 let res = openpgp_card_sequoia::sign(
-                    Arc::new(Mutex::new(oc_user)),
+                    oc_user,
                     &cert,
                     &mut text.as_bytes(),
                 );

openpgp-card-sequoia/src/signer.rs

@@ -15,11 +15,10 @@ use openpgp_card::CardSign;
 use openpgp_card::Hash;
 
 use crate::PublicKey;
-use std::sync::{Arc, Mutex};
 
 pub(crate) struct CardSigner {
     /// The OpenPGP card (authenticated to allow signing operations)
-    ocu: Arc<Mutex<CardSign>>,
+    ocu: CardSign,
 
     /// The matching public key for the card's signing key
     public: PublicKey,
@@ -31,12 +30,12 @@ impl CardSigner {
     /// An Error is returned if no match between the card's signing
     /// key and a (sub)key of `cert` can be made.
     pub fn new(
-        cs: Arc<Mutex<CardSign>>,
+        cs: CardSign,
         cert: &openpgp::Cert,
         policy: &dyn Policy,
     ) -> Result<CardSigner, OpenpgpCardError> {
         // Get the fingerprint for the signing key from the card.
-        let fps = cs.lock().unwrap().get_fingerprints()?;
+        let fps = cs.get_fingerprints()?;
         let fp = fps.signature();
 
         if let Some(fp) = fp {
@@ -123,10 +122,7 @@ impl<'a> crypto::Signer for CardSigner {
                     }
                 };
 
-                let cs = self.ocu.clone();
-                let mut cs = cs.lock().unwrap();
-
-                let sig = cs.signature_for_hash(hash)?;
+                let sig = self.ocu.signature_for_hash(hash)?;
 
                 let mpi = mpi::MPI::new(&sig[..]);
                 Ok(mpi::Signature::RSA { s: mpi })
@@ -134,10 +130,7 @@ impl<'a> crypto::Signer for CardSigner {
             (PublicKeyAlgorithm::EdDSA, mpi::PublicKey::EdDSA { .. }) => {
                 let hash = Hash::EdDSA(digest);
 
-                let cs = self.ocu.clone();
-                let mut cs = cs.lock().unwrap();
-
-                let sig = cs.signature_for_hash(hash)?;
+                let sig = self.ocu.signature_for_hash(hash)?;
 
                 let r = mpi::MPI::new(&sig[..32]);
                 let s = mpi::MPI::new(&sig[32..]);

openpgp-card/src/lib.rs

@@ -30,7 +30,7 @@ pub trait CardClient {
     fn transmit(&mut self, cmd: &[u8], buf_size: usize) -> Result<Vec<u8>>;
 }
 
-pub type CardClientBox = Box<dyn CardClient + Send>;
+pub type CardClientBox = Box<dyn CardClient + Send + Sync>;
 
 /// Information about the capabilities of the card.
 /// (feature configuration from card metadata)

scdc/src/lib.rs

@@ -5,7 +5,7 @@ use anyhow::{anyhow, Result};
 use futures::StreamExt;
 use lazy_static::lazy_static;
 use sequoia_ipc::assuan::{Client, Response};
-use std::sync::{Arc, Mutex};
+use std::sync::Mutex;
 use tokio::runtime::Runtime;
 
 use openpgp_card::errors::OpenpgpCardError;
@@ -17,7 +17,7 @@ lazy_static! {
 }
 
 pub struct ScdClient {
-    client: Arc<Mutex<Client>>,
+    client: Client,
 }
 
 impl ScdClient {
@@ -47,27 +47,24 @@ impl ScdClient {
 
     pub fn new(socket: &str) -> Result<Self> {
         let client = RT.lock().unwrap().block_on(Client::connect(socket))?;
-        let client = Arc::new(Mutex::new(client));
         Ok(Self { client })
     }
 
     /// SERIALNO --demand=D27600012401030400050000A8350000
     fn select_card(&mut self, serial: &str) -> Result<()> {
-        let mut client = self.client.lock().unwrap();
-
         let send = format!("SERIALNO --demand={}\n", serial);
-        client.send(send)?;
+        self.client.send(send)?;
 
         let mut rt = RT.lock().unwrap();
 
-        while let Some(response) = rt.block_on(client.next()) {
+        while let Some(response) = rt.block_on(self.client.next()) {
             if let Err(_) = response {
                 return Err(anyhow!("Card not found"));
             }
 
             if let Ok(Response::Status { .. }) = response {
                 // drop remaining lines
-                while let Some(drop) = rt.block_on(client.next()) {}
+                while let Some(_drop) = rt.block_on(self.client.next()) {}
 
                 return Ok(());
             }
@@ -81,15 +78,13 @@ impl CardClient for ScdClient {
     fn transmit(&mut self, cmd: &[u8], _: usize) -> Result<Vec<u8>> {
         let hex = hex::encode(cmd);
 
-        let mut client = self.client.lock().unwrap();
-
         let send = format!("APDU {}\n", hex);
         println!("send: '{}'", send);
-        client.send(send)?;
+        self.client.send(send)?;
 
         let mut rt = RT.lock().unwrap();
 
-        while let Some(response) = rt.block_on(client.next()) {
+        while let Some(response) = rt.block_on(self.client.next()) {
             println!("res: {:x?}", response);
             if let Err(_) = response {
                 unimplemented!();
@@ -99,7 +94,7 @@ impl CardClient for ScdClient {
                 let res = partial;
 
                 // drop remaining lines
-                while let Some(drop) = rt.block_on(client.next()) {
+                while let Some(drop) = rt.block_on(self.client.next()) {
                     println!("drop: {:x?}", drop);
                 }