Prove OpenSSL PQ crypto in browser WASI and document the migrationfeature/private-chat

2 files changed, 71 insertions, 0 deletions

diff --git a/infra/chat/build-openssl-wasi.sh b/infra/chat/build-openssl-wasi.sh
new file mode 100755
index 0000000..7cdd9b6
--- /dev/null
+++ b/infra/chat/build-openssl-wasi.sh
@@ -0,0 +1,49 @@
+#!/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 -- "$0")/../.." && pwd)"
+SOURCE="$ROOT/.tools/wasi-source"
+SDK="$SOURCE/wasi-sdk-34.0-x86_64-linux"
+PREFIX="$ROOT/.tools/openssl-wasi"
+mkdir -p "$SOURCE"
+
+fetch() {
+    file="$1"
+    digest="$2"
+    url="$3"
+    if ! test -f "$file"; then
+        curl --fail --location --retry 2 "$url" --output "$file.download"
+        printf '%s  %s\n' "$digest" "$file.download" | sha256sum --check --status
+        mv "$file.download" "$file"
+    fi
+    printf '%s  %s\n' "$digest" "$file" | sha256sum --check
+}
+
+fetch "$SOURCE/sdk.tar.gz" b761e3a0721dbae9c09a0059e5fdb2bf917d1b4a8a7b430fb3b5aafb0984b2c4 https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-34/wasi-sdk-34.0-x86_64-linux.tar.gz
+fetch "$SOURCE/openssl.tar.gz" a2157c2830efdec3788939b00c9b0638306d3f0bbb76dc4832ee503bb397df98 https://github.com/openssl/openssl/releases/download/openssl-3.6.5/openssl-3.6.5.tar.gz
+if ! test -x "$SDK/bin/clang"; then tar -xzf "$SOURCE/sdk.tar.gz" -C "$SOURCE"; fi
+if ! test -f "$SOURCE/openssl-3.6.5/Configure"; then tar -xzf "$SOURCE/openssl.tar.gz" -C "$SOURCE"; fi
+cp "$ROOT/infra/chat/openssl-wasi.conf" "$SOURCE/openssl-3.6.5/Configurations/99-stack-wasi.conf"
+cd "$SOURCE/openssl-3.6.5"
+env CC="$SDK/bin/clang" AR="$SDK/bin/llvm-ar" RANLIB="$SDK/bin/llvm-ranlib"     CFLAGS='-O2 -D_WASI_EMULATED_GETPID -Dgetuid=getpagesize -Dgeteuid=getpagesize -Dgetgid=getpagesize -Dgetegid=getpagesize'     LDFLAGS='-lwasi-emulated-getpid'     ./Configure stack-wasi --prefix="$PREFIX" --libdir=lib --with-rand-seed=getrandom     no-asm no-async no-autoload-config no-dso no-module no-posix-io no-secure-memory     no-shared no-sock no-stdio no-thread-pool no-threads no-ui-console
+make -j"${CHAT_BUILD_JOBS:-8}" build_libs
+make install_dev
+cd "$ROOT"
+rustup target add wasm32-wasip1
+RUST_LIB="$(rustc --print target-libdir --target wasm32-wasip1)/self-contained"
+env LIBCLANG_PATH="$SDK/lib" OPENSSL_DIR="$PREFIX" OPENSSL_STATIC=1     CC_wasm32_wasip1="$SDK/bin/clang" AR_wasm32_wasip1="$SDK/bin/llvm-ar"     BINDGEN_EXTRA_CLANG_ARGS_wasm32_wasip1="--sysroot=$SDK/share/wasi-sysroot --target=wasm32-wasip1 -fvisibility=default"     RUSTFLAGS="-Lnative=$RUST_LIB -Lnative=$SDK/share/wasi-sysroot/lib/wasm32-wasip1 -Clink-arg=-lwasi-emulated-getpid"     cargo build --locked --release -p stack-chat-crypto --bin stack-chat-crypto --target wasm32-wasip1
+sha256sum target/wasm32-wasip1/release/stack-chat-crypto.wasm
diff --git a/infra/chat/openssl-wasi.conf b/infra/chat/openssl-wasi.conf
new file mode 100644
index 0000000..479adee
--- /dev/null
+++ b/infra/chat/openssl-wasi.conf
@@ -0,0 +1,22 @@
+# 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/>.
+
+my %targets = (
+    "stack-wasi" => {
+        inherit_from => [ "BASE_unix" ],
+        lib_cppflags => add("-DL_ENDIAN"),
+        bn_ops => "THIRTY_TWO_BIT",
+    },
+);