nettle@3 for Mac

Nettle is a low-level cryptographic library aimed primarily at developers who need to integrate cryptographic functionality into their own programs. It does not provide a ready-made encryption tool interface; instead, it offers foundational cryptographic capabilities such as hashing, symmetric encryption, and public-key algorithms in the form of command-line tools and a library for higher-level software to call. It is suitable for programmers developing security-related applications, network protocol implementations, or system tools, as well as for technical users who want to understand low-level cryptographic mechanisms. Because it is positioned at the "low-level" layer, it emphasizes the reliability and flexibility of algorithm implementations rather than out-of-the-box ease of use. Ordinary users typically do not interact with it directly, but many security products may rely on it behind the scenes.