Libsodium documentation
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Introduction
Installation
Quickstart and FAQ
Projects using libsodium
Commercial support
Bindings for other languages
Usage
Helpers
Padding
Secure memory
Generating random data
Secret-key cryptography
Public-key cryptography
Hashing
Password hashing
Key derivation
Key exchange
Advanced
Internals
Roadmap
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Commercial support
The following companies offer professional support services for libsodium and applications using libsodium:

Edge Security (https://www.edgesecurity.com)

Libsodium-specific services include:
    Cryptographic and implementation auditing of libsodium usage.
    Security review of constructions, protocols, and applications using libsodium.
    Consulting on libsodium usage in applications -- web apps, backends, mobile, embedded, kernel, etc.
    General consulting and review of cryptography inquiries.
    Implementation security and helping to work toward a vulnerability-free codebase.
    Reverse engineering of complicated binaries.
    General consulting, advising, mentoring, and development.

Paragon Initiative Enterprises (https://paragonie.com)

Libsodium-specific services include:
    Library integration, with a focus on web applications (PHP, .NET, Python).
    Bespoke or standard high-level protocol design and implementation, e.g. Noise.
    Security audits, for in-house library integrations and/or high-level protocols.
    Custom application development that requires cryptography.
    Consulting and mentoring services.
​
(Please submit a pull request if you want your company added to that list)
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Edge Security (https://www.edgesecurity.com)
Paragon Initiative Enterprises (https://paragonie.com)