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Support for WebAssembly

Summary

Due to the need for a standard library to build these quantum routines it is not possible to compile them as pure no-std WASM. However by using wasi and its standard library, it becomes possible.

Steps

Download the wasm32-wasi sysroot build from https://github.com/WebAssembly/wasi-sdk and set the environment variable to point to it. This example installs it globally and makes it available system-wide. You may also consider adding it to your profile's environment variables or exporting the environment variable each time manually.

sudo mkdir -p /opt/wasi
cd /opt/wasi
wget https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-12/wasi-sysroot-12.0.tar.gz -O /tmp/wasi-sysroot-12.0.tar.gz
sudo tar -xvzf /tmp/wasi-sysroot-12.0.tar.gz
rm /tmp/wasi-sysroot-12.0.tar.gz

sudo tee /etc/profile.d/wasi.sh <<EOF
export WASI_SDK_DIR="/opt/wasi/wasi-sysroot"
EOF
source /etc/profile.d/wasi.sh

Note: While the source command brings the WASI export variables into your current terminal any new terminals will miss this until you log out and back in.

You can now compile the library for linking with WebAssembly using the following command or via cargo dependencies with the same specifics.

cd pqcrypto
cargo build --no-default-features --target wasm32-wasi --features avx2,serialization