The ISAAC random number generator

I saw this used by fruiz500 for his steganography app PassLok Stego, found it slow (seconds for large images), and decided to speed it up with WebAssembly.

Getting Started

Open index.html in a web browser and check out the developer console window to see proof of how much faster the WASM version of ISAAC is. You have to host it on a server though to avoid cross-origin errors.

For instance, on my computer, I see this in the console:

generate 1 million random ints with JS: 142.18408203125ms
generate 1 million random ints with WASM: 39.31298828125ms
generate 1 million random floats with JS: 138.297119140625ms
generate 1 million random floats with WASM: 46.101318359375ms

Compiling from C++ to WebAssembly

The compiled isaac.wasm is already provided but you can compile it yourself from isaac.cpp using emscripten. Emscripten is a nightmare to use though.

License

This project is licensed under the MIT License - see the LICENSE.md file for details.

Acknowledgments

• Thanks to fruiz500 for his cool privacy apps, you should check 'em out!