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DIDKit WASM

The current version of the ring crate does not provide all the symbols needed to run on the browser, see DEPS.md

To install wasm-pack run:

cargo install wasm-pack

To compile all features plus wasm32_c on ring, a C compiler is needed, see spruceid/ssi:

On Ubuntu this one option is to install clang and llvm:

sudo apt install clang-10 llvm-10

Then to compile with all features:

TARGET_CC=clang-10 TARGET_AR=llvm-ar-10 wasm-pack build --target web --out-dir pkg/wasm

To use a custom subset of features:

wasm-pack build --target web --out-dir pkg/wasm -- --no-default-features --features=issue        # issue credential/presentation
wasm-pack build --target web --out-dir pkg/wasm -- --no-default-features --features=verify       # verify credential/presentation
wasm-pack build --target web --out-dir pkg/wasm -- --no-default-features --features=credential   # issue/verify credential
wasm-pack build --target web --out-dir pkg/wasm -- --no-default-features --features=presentation # issue/verify presentation

don't forget to add TARGET_CC and TARGET_AR if using ring with wasm32_c

ASM target

For the ASM target the wasm2js build is necessary, to get this tool follow the steps in binaryen.

To compile all features for WASM target:

wasm-pack build --target web --out-dir pkg/wasm
npm --prefix loader/wasm install
npm --prefix loader/wasm run build

To compile all features for ASM target, assuming you're in this folder:

wasm-pack build --target bundler --out-dir pkg/asmjs
cd pkg/asmjs
$(BINARYEN_ROOT)/bin/wasm2js --pedantic -o didkit_wasm_bg1.js didkit_wasm_bg.wasm
cd ../..
cd loader/asmjs
./repack.sh
npm install
npm run build

WASM tests

loader/wasm contains tests. To run them you need to serve the files and open the page in a browser (you can then see the results in the console). You can start a server with

$ npm run serve