use opaque blake3 as hash

app/lib/core/core_extension.dart

@@ -46,5 +46,5 @@ extension UiFlightPositionExtension on UiFlightPosition {
 
 extension ImageDataExtension on Uint8List {
   ImageData toImageData() =>
-      ImageData(data: this, sha256: calculateSha256(this));
+      ImageData(data: this, hash: ImageData.computeHash(this));
 }

app/lib/util/cached_memory_image.dart

@@ -16,7 +16,7 @@ class CachedMemoryImage extends ImageProvider<CachedMemoryImage> {
   );
 
   factory CachedMemoryImage.fromImageData(ImageData imageData) =>
-      CachedMemoryImage(imageData.sha256, imageData.data);
+      CachedMemoryImage(imageData.hash, imageData.data);
 
   final String tag;
   final Uint8List bytes;

applogic/Cargo.toml

@@ -21,13 +21,14 @@ crate-type = ["cdylib", "staticlib", "lib"]
 unexpected_cfgs = { level = "warn", check-cfg = ['cfg(frb_expand)'] }
 
 [dependencies]
+phnxcoreclient = { path = "../coreclient" }
+phnxapiclient = { path = "../apiclient" }
+phnxtypes = { path = "../types" }
+
 tracing = "0.1"
 tracing-subscriber = { workspace = true }
 parking_lot = "0.12"
 uuid = { version = "1", features = ["v4"] }
-phnxcoreclient = { path = "../coreclient" }
-phnxapiclient = { path = "../apiclient" }
-phnxtypes = { path = "../types" }
 anyhow = { version = "1", features = ["backtrace"] }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
@@ -36,9 +37,6 @@ flutter_rust_bridge = { version = "=2.7.0", features = ["chrono", "uuid"] }
 notify-rust = "4"
 chrono = { workspace = true }
 jni = "0.21"
-
-# Workspace dependencies
 tokio-util = "0.7.13"
 tokio-stream = "0.1.17"
-sha2 = "0.10.8"
-hex = "0.4.3"
+blake3 = "1.5.5"

applogic/src/api/types.rs

@@ -17,7 +17,6 @@ use phnxcoreclient::{
     Message, MessageId, MimiContent, SystemMessage, UserProfile,
 };
 pub use phnxcoreclient::{ConversationId, ConversationMessageId};
-use sha2::{Digest, Sha256};
 use uuid::Uuid;
 
 /// Mirror of the [`ConversationId`] types
@@ -445,29 +444,35 @@ impl UiUserProfile {
 pub struct ImageData {
     /// The image data
     pub(crate) data: Vec<u8>,
-    /// SHA256 hash of the image as hex string
-    pub(crate) sha256: String,
+    /// Opaque hash of the image data as hex string
+    pub(crate) hash: String,
 }
 
 impl fmt::Debug for ImageData {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_struct("ImageData")
             .field("data", &self.data.len())
-            .field("sha256", &self.sha256)
+            .field("hash", &self.hash)
             .finish()
     }
 }
 
 impl ImageData {
     pub(crate) fn from_bytes(data: Vec<u8>) -> Self {
-        let sha256 = Sha256::digest(data.as_slice());
-        let sha256 = hex::encode(sha256);
-        Self { data, sha256 }
+        let hash = Self::compute_hash(&data);
+        Self { data, hash }
     }
 
     pub(crate) fn from_asset(asset: Asset) -> Self {
         match asset {
             Asset::Value(bytes) => Self::from_bytes(bytes),
         }
     }
+
+    /// Computes opaque hashsum of the data and returns it as a hex string.
+    #[frb(sync, positional)]
+    pub fn compute_hash(bytes: &[u8]) -> String {
+        let hash = blake3::hash(bytes);
+        hash.to_hex().to_string()
+    }
 }

applogic/src/api/utils.rs

@@ -4,16 +4,6 @@
 
 //! Misc. functions
 
-use flutter_rust_bridge::frb;
-use sha2::{Digest, Sha256};
-
 pub fn delete_databases(client_db_path: String) -> anyhow::Result<()> {
     phnxcoreclient::delete_databases(client_db_path.as_str())
 }
-
-/// Computes sha256 hashsum of the data and returns it as a hex string.
-#[frb(sync, positional)]
-pub fn calculate_sha256(data: &[u8]) -> String {
-    let sha256 = Sha256::digest(data);
-    hex::encode(sha256)
-}