hashsigs-solidity is a Solidity library implementing hash-based post-quantum cryptographic signatures.
The project provides a Solidity implementation of the Winternitz One-Time Signature Plus (WOTS+) scheme, a cryptographic signature algorithm designed to remain secure against attacks from quantum computers. Hash-based signatures derive their security from the properties of cryptographic hash functions rather than the difficulty of factoring or discrete logarithm problems, making them resistant to known quantum algorithms. The WOTS+ variant improves upon the original Winternitz scheme by reducing signature size and improving security parameters.
This tool is relevant for blockchain projects and smart contract systems that need to incorporate post-quantum cryptographic primitives. It suits applications where quantum-resistant security is a requirement or consideration, particularly in systems designed for long-term security or those handling sensitive operations that must remain secure against future quantum threats. The implementation is built for the Ethereum Virtual Machine and compatible chains, allowing direct integration into Solidity-based systems.
The project uses Foundry for development and testing, with test execution available through standard Foundry commands. The codebase is actively maintained with clear build and testing infrastructure in place. Development follows a structured approach with configurable test verbosity levels to support both routine validation and detailed debugging of cryptographic operations.
