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    "info": {
        "author": "Lukhnos Liu",
        "author_email": "lukhnos@lukhnos.org",
        "bugtrack_url": null,
        "classifiers": [
            "Development Status :: 4 - Beta",
            "Environment :: Console",
            "Intended Audience :: Developers",
            "Intended Audience :: Education",
            "Intended Audience :: System Administrators",
            "License :: OSI Approved :: MIT License",
            "Operating System :: Unix",
            "Programming Language :: Python :: 2",
            "Programming Language :: Python :: 3",
            "Topic :: Security :: Cryptography"
        ],
        "description": "# protectedblob\n\n[![Build Status](https://travis-ci.org/lukhnos/protectedblob-py.svg?branch=master)](https://travis-ci.org/lukhnos/protectedblob-py)\n\nprotectedblob is a library and a utility that can create a\npassphrase-protected blob from a plaintext as well as decrypt it.\n\nThis is still a work in progress. I am working on\n[a mobile password manager](https://github.com/lukhnos/PocketPasswords)\nthat depends on it. This project is also an exercise in creating a library\nthat supports both Python 2.7 and 3.4, among many other library development\ndrills.\n\nAlso please be warned that this code has not been through any security\nreview. Use this at your own risk.\n\n\n## Supported Platforms\n\nThis is currently tested only on OS X, but it should work on general *NIX.\nThere's currently no Windows support.\n\nThe code can be used with Python 2.6.9, 2.7, and 3.4.\n\n\n## Usage\n\nTo install:\n\n    python setup.py install\n\nIt's very likely that you'll need `sudo`:\n\n    sudo python setup.py install\n\nThis library depends on [PyCrypto](https://www.dlitz.net/software/pycrypto/),\nwhich in turn requires a C compiler to build. For OS X users, this means you\nhave to have Xcode or Xcode Command Line Tools installed (so that you have the\nClang C/C++ compiler). On Linux, you'll need gcc, and, on a lot of\ndistributions, a corresponding Python development package, such as\n`python-devel` on CentOS or `python-dev` on Debian or Ubuntu.\n\nAlternatively, install the code in development mode:\n\n    python setup.py develop\n\nTo encrypt a file:\n\n    protectedblob encrypt --input <input file> --output <output file>\n\nYou'll be prompted for the passphrase twice. There's also an optional\n`--rounds` argument to override the default number of rounds.\n\nTo decrypt:\n\n    protectedblob decrypt --input <input file> --output <output file>\n\n\n## High-Level Description\n\nA passphrased-protected blob has two types of data: An encrypted key, and the\nactual ciphertext. Before encrypting the plaintext, we generate a random key.\nThis makes it possible to change passphrase later.\n\nThe random key is encrypted with another key derived from the supplied\npassphrase. A key-derivation function (KDF) is used. To increase the strength\nof the derived key, many rounds are used.\n\nThe key derivation function is PBKDF2 with the underlying PDF being SHA-256. A\nrandom salt is also generated. The default number of rounds is 65536, although\nmore should be used on fast computers.\n\nThe real encryption key is encrypted using AES-256 (128-bit block, 256-bit\nkey) in ECB mode. We actually don't use the encryption key directly. Rather,\nwe derive two more keys from it: One for the AES-256 cipher, another for the\nHMAC function. The two keys are derived by using an AES-256 in ECB mode to\nencrypt 32 bytes of 0x00's and 32 bytes of 0x01's, respectively. The plaintext\nis then encrypted using AES-256 in CBC mode with a 128-bit IV (initialization\nvector).\n\nThe library implements authenticated encryption. The HMAC function is SHA-256,\nand the HMAC is created from the ciphertext (so encrypt-then-mac).",
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