feat(xchacha): spawn gen_key, encrypt & decrypt blocking

crdt-enc-xchacha20poly1305/Cargo.toml

@@ -13,6 +13,7 @@ rmp-serde = "0.15"
 serde_bytes = "0.11"
 uuid = "0.8"
 async-trait = "0.1"
+agnostik = {git = "https://github.com/chpio/agnostik.git", branch = "tokio1"}
 
 [dependencies.crdt-enc]
 path = "../crdt-enc"

crdt-enc-xchacha20poly1305/src/lib.rs

@@ -1,3 +1,4 @@
+use ::agnostik::spawn_blocking;
 use ::anyhow::{Context, Error, Result};
 use ::async_trait::async_trait;
 use ::chacha20poly1305::{
@@ -29,20 +30,26 @@ impl EncHandler {
 #[async_trait]
 impl crdt_enc::cryptor::Cryptor for EncHandler {
     async fn gen_key(&self) -> Result<VersionBytes> {
+        spawn_blocking(|| {
             let mut key = [0u8; KEY_LEN];
             thread_rng()
                 .try_fill_bytes(&mut key)
                 .context("Unable to get random data for secret key")?;
             Ok(VersionBytes::new(KEY_VERSION, key.into()))
+        })
+        .await
     }
 
-    async fn encrypt(&self, key: VersionBytesRef<'_>, clear_text: &[u8]) -> Result<Vec<u8>> {
+    async fn encrypt(&self, key: VersionBytesRef<'_>, clear_text: Vec<u8>) -> Result<Vec<u8>> {
         key.ensure_version(KEY_VERSION)
             .context("not matching key version")?;
         if key.as_ref().len() != KEY_LEN {
             return Err(Error::msg("Invalid key length"));
         }
-        let key = Key::from_slice(key.as_ref());
+        let key = key.as_ref().to_vec();
+
+        spawn_blocking(move || {
+            let key = Key::from_slice(&key);
             let aead = XChaCha20Poly1305::new(key);
             let mut nonce = [0u8; NONCE_LEN];
             thread_rng()
@@ -50,7 +57,7 @@ impl crdt_enc::cryptor::Cryptor for EncHandler {
                 .context("Unable to get random data for nonce")?;
             let xnonce = XNonce::from_slice(&nonce);
             let enc_data = aead
-            .encrypt(xnonce, clear_text)
+                .encrypt(xnonce, clear_text.as_ref())
                 .context("Encryption failed")?;
             let enc_box = EncBox {
                 nonce: Cow::Borrowed(nonce.as_ref()),
@@ -62,16 +69,21 @@ impl crdt_enc::cryptor::Cryptor for EncHandler {
             let version_box_bytes =
                 rmp_serde::to_vec_named(&version_box).context("failed to encode version box")?;
             Ok(version_box_bytes)
+        })
+        .await
     }
 
-    async fn decrypt(&self, key: VersionBytesRef<'_>, enc_data: &[u8]) -> Result<Vec<u8>> {
+    async fn decrypt(&self, key: VersionBytesRef<'_>, enc_data: Vec<u8>) -> Result<Vec<u8>> {
         key.ensure_version(KEY_VERSION)
             .context("not matching key version")?;
         if key.as_ref().len() != KEY_LEN {
             return Err(Error::msg("Invalid key length"));
         }
+        let key = key.as_ref().to_vec();
+
+        spawn_blocking(move || {
             let version_box: VersionBytesRef =
-            rmp_serde::from_read_ref(enc_data).context("failed to parse version box")?;
+                rmp_serde::from_read_ref(&enc_data).context("failed to parse version box")?;
             version_box
                 .ensure_version(DATA_VERSION)
                 .context("not matching version of encryption box")?;
@@ -87,6 +99,8 @@ impl crdt_enc::cryptor::Cryptor for EncHandler {
                 .decrypt(&xnonce, enc_box.enc_data.as_ref())
                 .context("Decryption failed")?;
             Ok(clear_text)
+        })
+        .await
     }
 }
 

crdt-enc/src/cryptor.rs

@@ -22,6 +22,6 @@ where
     }
 
     async fn gen_key(&self) -> Result<VersionBytes>;
-    async fn encrypt(&self, key: VersionBytesRef<'_>, clear_text: &[u8]) -> Result<Vec<u8>>;
+    async fn encrypt(&self, key: VersionBytesRef<'_>, clear_text: Vec<u8>) -> Result<Vec<u8>>;
-    async fn decrypt(&self, key: VersionBytesRef<'_>, enc_data: &[u8]) -> Result<Vec<u8>>;
+    async fn decrypt(&self, key: VersionBytesRef<'_>, enc_data: Vec<u8>) -> Result<Vec<u8>>;
 }

crdt-enc/src/lib.rs

@@ -355,7 +355,7 @@ where
             Ok((clear_text, states_to_remove, ops_to_remove, key))
         })?;
 
-        let data_enc = self.cryptor.encrypt(key.key(), &clear_text).await.unwrap();
+        let data_enc = self.cryptor.encrypt(key.key(), clear_text).await.unwrap();
 
         let enc_data = VersionBytes::new(self.current_data_version, data_enc);
 
@@ -436,7 +436,7 @@ where
 
                     let clear_text = self
                         .cryptor
-                        .decrypt(key.key(), state.as_ref())
+                        .decrypt(key.key(), state.into_inner())
                         .await
                         .with_context(|| format!("failed decrypting remote state {}", name))?;
 
@@ -500,7 +500,7 @@ where
                     data.ensure_versions(SUPPORTED_VERSIONS)?;
                     let clear_text = self
                         .cryptor
-                        .decrypt(key.key(), data.as_ref())
+                        .decrypt(key.key(), data.into_inner())
                         .await
                         .unwrap();
 
@@ -684,7 +684,7 @@ where
 
         let data_enc = self
             .cryptor
-            .encrypt(key.key(), &clear_text.serialize())
+            .encrypt(key.key(), clear_text.serialize())
             .await
             .unwrap();