Metadata-Version: 1.0
Name: pprp
Version: 0.2.1
Summary: A pure-Python Rijndael (AES) and PBKDF2 library. Python2.7- and Python3-compatible.
Home-page: https://github.com/dsoprea/RijndaelPbkdf
Author: Dustin Oprea
Author-email: myselfasunder@gmail.com
License: GPL 2
Description: --------
        Overview
        --------
        
        This package was a remedy to there being no PyPI-published, pure-Python 
        Rijndael (AES) implementations, and that nothing available, in general, was 
        compatible with both Python2 *and* Python3. The same is true of the PBKDF2 
        key-expansion algorithm.
        
        The encryptor takes a source generator (which yields individual blocks). There 
        are source-generators provided for both data from a variable and data from a 
        file. It is trivial if you'd like to write your own. The encryptor and 
        decryptor functions are written as generators. Decrypted data has PKCS7
        padding. A utility function is provided to trim this (*trim_pkcs7_padding*).
        
        The implementation includes Python2 and Python3 implementations of both 
        Rijndael and PBKDF2, and chooses the version when loaded.
        
        The default block-size is 128-bits in order to be compatible with AES.
        
        This project is also referred to as *pprp*, which stands for "Pure Python 
        Rijndael and PBKDF2".
        
        
        ------------
        Installation
        ------------
        
        Install via *pip*::
        
            $ sudo pip install pprp
        
        
        -------
        Example
        -------
        
        Encrypt and decrypt the data, and compare the results. This example works in 
        both Python 2 and 3.
        
        Top imports and defines::
        
            import io
            import os.path
            import hashlib
        
            import pprp
            import pprp.config
        
            # Make the strings the right type for the current Python version.
            def trans(text):
                return text.encode('ASCII') if sys.version_info[0] >= 3 else text
        
            passphrase = trans('password')
            salt = trans('salt')
            key_size = 32
            data = "this is a test" * 100
        
        Do the key-expansion::
        
            key = pprp.pbkdf2(passphrase, salt, key_size)
        
        Create a source from available data::
        
            sg = pprp.data_source_gen(data)
        
        Feed the source into the encryptor::
        
            eg = pprp.rjindael_encrypt_gen(key, sg)
        
        Feed the encryptor into the decryptor::
        
            dg = pprp.rjindael_decrypt_gen(key, eg)
        
        Sink the output into an IO stream, and trim the padding off the last block::
        
            s = io.BytesIO()
            ends_at = 0
            for block in dg:
                ends_at += pprp.config.DEFAULT_BLOCK_SIZE
                if ends_at >= len(data):
                    block = pprp.trim_pkcs7_padding(block)
        
                s.write(block)
        
            decrypted = s.getvalue()
        
        Check the result::
        
            assert data == decrypted.decode('ASCII')
        
        The following is a portion of the output of the example script 
        (test/example.py). Notice that, due to this being an efficient, generator-based 
        design, the encryption of each block is followed by a decryption::
        
            2014-07-01 12:24:13,182 - pprp.source - DEBUG - Yielding [data] source block: (0)-(0)
            2014-07-01 12:24:13,182 - pprp.adapters - DEBUG - Encrypting and yielding encrypted block: (0)
            2014-07-01 12:24:13,183 - pprp.adapters - DEBUG - Decrypting and yielding decrpted block: (0)
            2014-07-01 12:24:13,183 - pprp.source - DEBUG - Yielding [data] source block: (1)-(16)
            2014-07-01 12:24:13,183 - pprp.adapters - DEBUG - Encrypting and yielding encrypted block: (1)
            2014-07-01 12:24:13,183 - pprp.adapters - DEBUG - Decrypting and yielding decrpted block: (1)
            2014-07-01 12:24:13,183 - pprp.source - DEBUG - Yielding [data] source block: (2)-(32)
            2014-07-01 12:24:13,183 - pprp.adapters - DEBUG - Encrypting and yielding encrypted block: (2)
            2014-07-01 12:24:13,183 - pprp.adapters - DEBUG - Decrypting and yielding decrpted block: (2)
            2014-07-01 12:24:13,184 - pprp.source - DEBUG - Yielding [data] source block: (3)-(48)
            2014-07-01 12:24:13,184 - pprp.adapters - DEBUG - Encrypting and yielding encrypted block: (3)
            2014-07-01 12:24:13,184 - pprp.adapters - DEBUG - Decrypting and yielding decrpted block: (3)
            ...
        
        
        -----
        Notes
        -----
        
        A different block-size may be passed in to each of the generators. The default 
        block-size can also be passed via environment variable as PPRP_BLOCK_SIZE.
        
Keywords: rijdael pbkdf2
Platform: UNKNOWN
