Isis Lovecruft 6136871607 Optimisation to succeed fast when checking signature scalar is reduced.
This provides a minor optimisation for ed25519 signature verification, when used
without the -DED25519_COMPAT feature, to strictly check for a fully reduced
scalar, `s`, component in variable time by first checking that the most
significant *four* bits are unset, and only if any of them are set proceed to
the `sc25519_is_canonical` check which performs the full reduction.  This should
result in succeeding fast for the check on roughly half of all well-formed,
canonicalised signatures.

This is safely backwards compatible with the previous implementation
of strict checking for signature scalars.
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libsodium

Sodium is a new, easy-to-use software library for encryption, decryption, signatures, password hashing and more.

It is a portable, cross-compilable, installable, packageable fork of NaCl, with a compatible API, and an extended API to improve usability even further.

Its goal is to provide all of the core operations needed to build higher-level cryptographic tools.

Sodium supports a variety of compilers and operating systems, including Windows (with MingW or Visual Studio, x86 and x64), iOS, Android, as well as Javascript and Webassembly.

Documentation

The documentation is available on Gitbook and built from the libsodium-doc repository:

Integrity Checking

The integrity checking instructions (including the signing key for libsodium) are available in the installation section of the documentation.

Community

A mailing-list is available to discuss libsodium.

In order to join, just send a random mail to sodium-subscribe {at} pureftpd {dot} org.

Contributors

Code Contributors

This project exists thanks to all the people who contribute. [Contribute].

Financial Contributors

Become a financial contributor and help us sustain our community. [Contribute]

Individuals

Organizations

Support this project with your organization. Your logo will show up here with a link to your website. [Contribute]

License

ISC license.

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