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            "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
            "Natural Language :: English",
            "Programming Language :: Python :: 3.6",
            "Programming Language :: Python :: 3.7",
            "Topic :: Security :: Cryptography",
            "Topic :: Software Development :: Libraries :: Python Modules"
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        "description": "libsignal-python\n========\nSignal encryption library for Python.\n\n[![Maturity](https://img.shields.io/pypi/status/libsignal.svg)](https://pypi.python.org/pypi/libsignal)\n[![License](https://img.shields.io/pypi/l/libsignal.svg)](https://pypi.python.org/pypi/libsignal)\n[![Version](https://img.shields.io/pypi/v/libsignal.svg)](https://pypi.python.org/pypi/libsignal)\n\n\nAbout\n--------\nThis is a python port of [libsignal-protocol-java](https://github.com/WhisperSystems/libaxolotl-android)\noriginally written by [Moxie Marlinspike](https://github.com/moxie0)\n\nCompare with\n[libsignal-protocol-php](https://github.com/albert-chin/libsignal-protocol-php)\nforked from\n[libaxolotl-php](https://github.com/mgp25/libaxolotl-php),\nwhich is a php port.\n\nOverview from original author's:\n\n > This is a ratcheting forward secrecy protocol that works in synchronous\n > and asynchronous messaging environments. The protocol overview is available\n > [here](https://github.com/trevp/axolotl/wiki), and the details of the wire\n > format are available [here](https://github.com/trevp/axolotl/wiki).\n \nRead rest of of details [here](https://github.com/WhisperSystems/libaxolotl-android/blob/master/README.md).\n\n\nInstallation\n--------\nThe library has some dependencies which are automatically pulled and installed\nif you use the instructions below for your OS\n\n - [protobuf 3.6+](https://github.com/google/protobuf/)\n - [cryptography](https://cryptography.io)\n - [python-axolotl-curve25519](https://github.com/tgalal/python-axolotl-curve25519)\n\n## Linux\n\nYou need to have python headers installed, usually through installing a package called `python-dev`, then as superuser run:\n```\npython setup.py install\n```\n\n## Mac\n\nI don't have mac to test. Send me instructions or a MacBook.\n\n## Windows\n\n - Install [mingw](http://www.mingw.org/) compiler\n - Add mingw to your PATH\n - In PYTHONPATH\\Lib\\distutils create a file called distutils.cfg and add these lines:\n \n```\n[build]\ncompiler=mingw32\n```\n\n - Install gcc: ```mingw-get.exe install gcc```\n - Install [zlib](http://www.zlib.net/)\n - ```python setup.py install```\n\n\nUsage\n--------\nThis python port is done in an almost 1:1 mapping to the original java code.\nTherefore any original documentation for the java code can be easily mapped\nand used with this python port.\n\n## Install time\n\nAt install time, a libaxolotl client needs to generate its identity keys, registration id, and\nprekeys.\n\n```python\n    identityKeyPair = KeyHelper.generateIdentityKeyPair()\n    registrationId  = KeyHelper.generateRegistrationId()\n    preKeys         = KeyHelper.generatePreKeys(startId, 100)\n    lastResortKey   = KeyHelper.generateLastResortKey()\n    signedPreKey    = KeyHelper.generateSignedPreKey(identityKeyPair, 5)\n\n    #Store identityKeyPair somewhere durable and safe.\n    #Store registrationId somewhere durable and safe.\n\n    #Store preKeys in PreKeyStore.\n    #Store signed prekey in SignedPreKeyStore.\n```\n\n## Building a session\n\nA libaxolotl client needs to implement four interfaces: IdentityKeyStore, PreKeyStore, \nSignedPreKeyStore, and SessionStore.  These will manage loading and storing of identity, \nprekeys, signed prekeys, and session state.\n\nOnce those are implemented, building a session is fairly straightforward:\n\n```python\nsessionStore      = MySessionStore()\npreKeyStore       = MyPreKeyStore()\nsignedPreKeyStore = MySignedPreKeyStore()\nidentityStore     = MyIdentityKeyStore()\n\n# Instantiate a SessionBuilder for a remote recipientId + deviceId tuple.\nsessionBuilder = SessionBuilder(sessionStore, preKeyStore, signedPreKeyStore,\n                                                   identityStore, recipientId, deviceId)\n\n# Build a session with a PreKey retrieved from the server.\nsessionBuilder.process(retrievedPreKey)\n\nsessionCipher = SessionCipher(sessionStore, recipientId, deviceId)\nmessage       = sessionCipher.encrypt(\"Hello world!\")\n\ndeliver(message.serialize())\n```\n\n\nExamples\n--------\npython-axolotl is actively used in [yowsup](https://github.com/tgalal/yowsup) to\nsupport the new end to end encryption in WhatsApp\n\n\nLicense\n--------\nLicensed under the GPLv3: http://www.gnu.org/licenses/gpl-3.0.html\n",
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