libsodium is a cryptographic library that provides encryption, decryption, digital signatures, and secure password hashing through a modern, portable, and easy-to-use API.
The library solves the problem of making cryptography accessible to application developers by offering a simplified interface to complex cryptographic operations. It is a maintained fork of NaCl that extends the original with improved usability while preserving API compatibility. The tool handles the selection of appropriate algorithms and secure defaults, allowing developers to perform cryptographic tasks without deep expertise in the field.
Developers should choose libsodium if they need a straightforward, well-documented cryptographic library for C projects or applications that can bind to C. It suits projects ranging from small utilities to large systems that require encryption, authentication, or digital signatures. The library's cross-platform support spans Windows, iOS, Android, JavaScript, and WebAssembly, making it suitable for diverse deployment targets. Its user-friendly API design prioritizes security by default, reducing the likelihood of misuse compared to lower-level cryptographic interfaces.
The project maintains a two-tier release system where point releases introduce new features or significant changes while stable releases between point releases provide maintenance updates and security fixes without breaking changes, ensuring predictable upgrade paths for dependent applications. Security fixes are prioritized and deployed to the stable branch immediately, with point releases tagged shortly after. The project actively solicits and integrates community contributions while maintaining financial sustainability through individual and organizational support channels.
