Des Key Generation Program In C
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2020-4-10 The Data Encryption Standard (DES) is a symmetric-key block cipher published by the National Institute of Standards and Technology (NIST). DES is an implementation of a Feistel Cipher. It uses 16 round Feistel structure. The block size is 64-bit. I am reading over a slide that I found online regarding the DES algorithm for encryption and I am a little confused about the per round key generation. From the slide below, I understand that each per round key is obtained by shifting left either 1 or 2 bits depending on the round.
| Installation: | pip install pydes |
| Author: | Todd Whiteman |
| Issue Date: | 28th April, 2010 |
| Version: | 2.0.1 |
| Compatibility: | Works in both Python 2, Python 3. |
| License: | MIT License |
| Source code: | GitHub: pyDes |
Installation
Using the Python package manager:
Or, for manual installation
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Extract the files from the downloaded archive and run: To test, run:Usage
Docs and Examples
About pyDES
This is a pure python implementation of the DES encryption algorithm. It is in pure python to avoid portability issues, since most DES implementations are programmed in C (for performance reasons).
Triple DES class is also implemented, utilizing the DES base. Triple DES is either DES-EDE3 with a 24 byte key, or DES-EDE2 with a 16 byte key. See the 'About triple DES' section below more info on this algorithm.
The code below is not written for speed or performance, so not for those needing a fast DES implementation, but rather a handy portable solution ideal for small usage. It takes my Linux (circa 2015) machine 1 second per 20Kb to encrypt or decrypt using the DES method. That's SLOW!!
About triple DES
Triple DES is just running the DES algorithm 3 times over the data with the specified key. The supplied key is split up into 3 parts, each part being 8 bytes long (the mandatory key size for DES).
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The triple DES algorithm uses the DES-EDE3 method when a 24 byte key is supplied. This means there are three DES operations in the sequence encrypt-decrypt-encrypt with the three different keys. The first key will be bytes 1 to 8, the second key bytes 9 to 16 and the third key bytes 17 to 24.
If a 16 byte key is supplied instead, the triple DES method used will be DES-EDE2. This means there are three DES operations in the sequence encrypt-decrypt-encrypt, but the first and third operations use the same key. The first/third key will be bytes 1 to 8 and the second key bytes 9 to 16.
Credits
Thanks go to:
- David Broadwell for his ideas, comments and suggestions.
- Mario Wolff for finding errors in triple des CBC.
- Santiago Palladino for enlightening me on the PKCS5 padding technique.
- Shaya for correcting the PAD_PKCS5 triple des CBC errors.
- Yoav Aner for spotting a triple des CBC IV error.
Source
pyDes source code is released as MIT (free) and is available from GitHub: pyDes
Download
Download (Windows): pyDes-2.0.1.zip
Download (Unix): pyDes-2.0.1.tar.gz
Older pyDES versions
Download (Windows): pyDes-2.0.0.zip
Download (Unix): pyDes-2.0.0.tar.gz
Download (Windows): pyDes-1.3.1.zip
Download (Unix): pyDes-1.3.1.tar.gz
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Download (Windows): pyDes-1.3.zip
Download (Unix): pyDes-1.3.tar.gz
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Download (Windows): pyDes-1.2.zip
Download (Unix): pyDes-1.2.tar.gz
Download (Windows): pyDes-1.1.zip
Download (Unix): pyDes-1.1.tar.gz
Download (Windows): pyDes-1.0.zip
Download (Unix): pyDes-1.0.tar.gz