nacl

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Overview

Artifact ID: 4694804a6200283faf0e4bfc4a070c50797331c089d0ce6087953047d538e57e
Page Name:nacl
Date: 2018-07-16 21:00:56
Original User: alex
Content

NaCl - Networking and Cryptography library (pronounced "salt")

NaCl (pronounced "salt") is a new easy-to-use high-speed software library for network communication, encryption, decryption, signatures, etc. NaCl's goal is to provide all of the core operations needed to build higher-level cryptographic tools. Of course, other libraries already exist for these core operations. NaCl advances the state of the art by improving security, by improving usability, and by improving speed.

Key features

No data flow from secrets to load addresses. No data flow from secrets to branch conditions. No padding oracles. Centralizing randomness. Avoiding unnecessary randomness. Extremely high speed.

Functions supported

Simple NaCl applications need only six high-level NaCl functions: crypto_box for public-key authenticated encryption; crypto_box_open for verification and decryption; crypto_box_keypair to create a public key in the first place; and similarly for signatures crypto_sign, crypto_sign_open, and crypto_sign_keypair.

A minimalist implementation of the NaCl API would provide just these six functions. TweetNaCl is more ambitious, supporting all 25 of the NaCl functions listed below, which as mentioned earlier are all of the C NaCl functions used by applications. This list includes all of NaCl's "default" primitives except for crypto_auth_hmacsha512256, which was included in NaCl only for compatibility with standards and is superseded by crypto_onetimeauth.

The Ed25519 signature system has not yet been integrated into NaCl, since the Ed25519 software has not yet been fully audited; NaCl currently provides an older signature system. However, NaCl has announced that it will transition to Ed25519, so TweetNaCl provides Ed25519.

Public-key cryptography

Authenticated encryption using Curve25519, Salsa20, and Poly1305

Signatures using Ed25519

Secret-key cryptography

Authenticated encryption using Salsa20 and Poly1305

Encryption using Salsa20

Authentication using HMAC-SHA-512-256

One-time authentication using Poly1305

Low-level functions

Hashing using SHA-512 or SHA-256

See Also

WEB: nacl.cr.yp.to 20110221
PDF: The security impact of a new cryptographic library

WEB: tweetnacl.cr.yp.to 20140427
PDF: TweetNaCl: A crypto library in 100 tweets

WEB: en.wikipedia.org/wiki/NaCl_(software)
WEB: en.wikipedia.org/wiki/Elliptic_curve_cryptography
WEB: en.wikipedia.org/wiki/Curve25519

Legal Notice

Copyright (C) 2016 Alexander Schoepe, Bochum, DE

NaCl and TweetNaCl crypto library are public domain and the Tcl package BSD-3 license

Contributors (alphabetical order)

Daniel J. Bernstein, University of Illinois at Chicago and Technische Universiteit Eindhoven
Bernard van Gastel, Radboud Universiteit Nijmegen
Wesley Janssen, Radboud Universiteit Nijmegen
Tanja Lange, Technische Universiteit Eindhoven
Peter Schwabe, Radboud Universiteit Nijmegen
Sjaak Smetsers, Radboud Universiteit Nijmegen