chopmob-cloud/algovoi-falcon

algovoi-falcon is a small code library that lets developers use a newer, quantum resistant style of digital signature, called Falcon-1024, together with the Algorand blockchain. A digital signature is how a blockchain account proves that a transaction really came from its owner. Most blockchain accounts today rely on signature methods that could, in theory, eventually be broken by a powerful enough quantum computer, and Falcon is designed to resist that kind of attack instead. The library lets you generate a new keypair, meaning the public and private codes an account needs, either from a random source or from a 48 byte value you supply yourself so you can recreate the exact same account later. It also lets you sign messages with the private key and check those signatures with the public key. From the public key, it can work out a special Algorand address that is tied to Falcon signatures rather than the blockchain's usual signature method. This special kind of address only works for spending funds if the underlying Algorand network supports a specific feature needed to check Falcon signatures on chain. The library warns that you should confirm your target network actually has this feature before relying on it, since an account can always receive funds but might not be able to spend them without it. The heavy cryptographic work is done by a compiled WebAssembly file, built from Algorand's own Falcon library written in C, wrapped so it can run the same way in a browser, a browser extension, or in Node.js. You have to supply this WebAssembly file yourself when starting up the library. The underlying Falcon C code is released under the MIT license, and the TypeScript wrapper code in this library is released under Apache-2.0, so both are freely reusable, including in commercial products, as long as the required notices are kept. To use the project, you install its dependencies, build the TypeScript source, and run its test suite, which checks that key generation, signing, verifying, and address derivation all behave the same way every time given the same seed.