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README.md

# Curve - authentication and encryption library

Curve implements the CurveZMQ elliptic curve security mechanism, for use in ZeroMQ applications. This library is primarily a reference implementation for the CurveZMQ specification but may also be used for end-to-end security.

The ZeroMQ core library has its own implementation of CurveZMQ over TCP, since July 2013. The Curve library is intended:

  • To facilitate CurveZMQ implementations in other languages by providing a reference implementation.
  • To provide security for older versions of ZeroMQ.
  • To provide end-to-end security over untrusted intermediaries, for instance between two chat clients connected over a public ZeroMQ-based chat server.
  • To provide security over other transports that fit the one-to-one model (it will not work over multicast).

CurveZMQ creates encrypted sessions ("connections") between two peers using short term keys that it securely exchanges using long term keys. When the session is over, both sides discard their short term keys, rendering the encrypted data unreadable, even if the long term keys are captured. It is not designed for long term encryption of data.

The design of CurveZMQ stays as close as possible to the security handshake of CurveCP, a protocol designed to run over UDP.

## Ownership and License

Copyright (c) the Contributors as noted in the AUTHORS file. This file is part of the Curve authentication and encryption library. This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

## Contributing

This project uses the C4.1 (Collective Code Construction Contract) process for contributions.

This project uses the CLASS (C Language Style for Scalabilty) guide for code style.

To report an issue, use the Curve issue tracker at github.com.

## Dependencies

This project needs these projects:

  • libsodium - git://github.com/jedisct1/libsodium.git
  • libzmq - git://github.com/zeromq/libzmq.git
  • libczmq - git://github.com/zeromq/czmq.git
## Building and Installing

This project uses autotools for packaging. To build from git you must first build libsodium, libzmq, and libczmq. The simplest way currently is to get these directly from GitHub. All example commands are for Linux:

#   libsodium
git clone git://github.com/jedisct1/libsodium.git
cd libsodium
./autogen.sh
./configure && make check
sudo make install
sudo ldconfig
cd ..

#   libzmq
git clone git://github.com/zeromq/libzmq.git
cd libzmq
./autogen.sh
./configure && make check
sudo make install
sudo ldconfig
cd ..

#   CZMQ
git clone git://github.com/zeromq/czmq.git
cd czmq
./autogen.sh
./configure && make check
sudo make install
sudo ldconfig
cd ..

git clone git://github.com/zeromq/libcurve.git
cd libcurve
sh autogen.sh
./autogen.sh
./configure && make check
sudo make install
sudo ldconfig
cd ..

You will need the libtool and autotools packages. On FreeBSD, you may need to specify the default directories for configure:

./configure --with-libzmq=/usr/local
## Linking with an Application

Include curve.h in your application and link with libcurve. Here is a typical gcc link command:

gcc -lcurve -lsodium -lzmq -lczmq myapp.c -o myapp
## Documentation

All documentation is provided in the doc/ subdirectory.

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