Implement experimental file-based encrypted private chat

Add fixed-suite Rust/WASI identity files, signed challenge authentication, ciphertext-only SQLite storage, a minimal LibreJS-compatible interface, and consistent backup snapshots. Keep production unchanged and document the local workflow, limits, source distribution, and browser recovery tests.

1 files changed, 29 insertions, 0 deletions

diff --git a/infra/chat/build-source.sh b/infra/chat/build-source.sh
new file mode 100644
index 0000000..6f24dcd
--- /dev/null
+++ b/infra/chat/build-source.sh
@@ -0,0 +1,29 @@
+#!/bin/sh
+# Copyright (C) 2026 Doan Luu Duc Tai <doan@luuduct.ai>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+set -eu
+ROOT="$(CDPATH= cd -- "$(dirname -- "$0")/../.." && pwd)"
+cd "$ROOT"
+BUILD="$ROOT/var/build"
+mkdir -p "$BUILD"
+cargo vendor --locked var/build/chat-vendor | sed 's|directory = "var/build/chat-vendor"|directory = "chat-vendor"|' > "$BUILD/chat-vendor-config.txt"
+cp "$ROOT/.tools/wasi-source/openssl.tar.gz" "$BUILD/chat-openssl-3.6.5.tar.gz"
+printf '%s  %s\n' a2157c2830efdec3788939b00c9b0638306d3f0bbb76dc4832ee503bb397df98 "$BUILD/chat-openssl-3.6.5.tar.gz" | sha256sum --check
+source_list="$BUILD/chat-source-files.txt"
+find Cargo.toml Cargo.lock rust-toolchain.toml .cargo .gitignore .gitattributes src crates infra web docs README.txt LICENSE deny.toml about.toml about.hbs .env.example -type f -print > "$source_list"
+tar -czf "$BUILD/chat-source.tar.gz.pending" --verbatim-files-from -T "$source_list" -C "$BUILD" chat-vendor chat-vendor-config.txt chat-openssl-3.6.5.tar.gz
+mv "$BUILD/chat-source.tar.gz.pending" "$BUILD/chat-source.tar.gz"
+sha256sum "$BUILD/chat-source.tar.gz"