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POAES - Encryption with Crypto (node-js) / decryption with Pycrypto (python)
 

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  1. POAES - Encryption with Crypto (node-js) / decryption with Pycrypto (python)
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    <p>I'm writing this question + answer because I struggled a lot (maybe because of a lack of experience), got lost in many different ways of encrypting/decrypting things with node or python.</p> <p>I thought maybe my case could help people in the future.</p> <p>What I needed to do:</p> <ul> <li>Get data from a form, encrypt them using Crypto (node-js)</li> <li>Pass the encrypted data in Python and decrypt it using PyCrypto.</li> </ul> <p>I chose to use the AES encryption.</p> <p>Here is how I started (I'm not gonna go through everything I tried):</p> <ul> <li><p>I followed the example at the end of <a href="http://docs.nodejitsu.com/articles/cryptography/how-to-use-crypto-module" rel="nofollow noreferrer">this page</a></p> <p>Which gave in my case:</p> <p>(this might be a very bad mix between javascript and coffeescript)</p> <pre><code>crypto = require "crypto" [...] key = "mykeywhatever" cipher = crypto.createCipher('aes192', key) cipher.update('string i want to encode', 'binary', 'hex') encoded_string = cipher.final('hex') [...] </code></pre> <p>This worked pretty fine to encode my string.</p></li> <li><p>Then I wrote my python script to decrypt this string, using the readme on <a href="https://github.com/dlitz/pycrypto" rel="nofollow noreferrer">PyCrypto's github's page</a>:</p> <pre><code>from Crypto.Cipher import AES [...] my_string = data_coming_from_rabbitmq obj = AES.new('mykeywhatever', AES.MODE_CBC) obj.decrypt(ciphertext) [...] </code></pre> <p>This obviously didn't work: in the readme there is an IV but since I didn't gave one in the node script, why would I give one in the python one?</p></li> </ul> <p>After more googling, I learnt that node's Crypto uses OpenSSL, while PyCrypto apparently doesn't. So I looked into that and found those pages:</p> <ul> <li><a href="https://stackoverflow.com/questions/8806481/how-can-i-decrypt-something-with-pycrypto-that-was-encrypted-using-openssl">How can I decrypt something with PyCrypto that was encrypted using OpenSSL?</a></li> <li><a href="https://stackoverflow.com/questions/5345719/is-aes-the-same-in-libraries-pycrypto-node-js-crypto">Is AES the same in libraries PyCrypto &amp; Node.JS Crypto</a></li> <li>and a lot more...</li> </ul> <p>So things got complicated, no one is doing the same thing to decrypt data, I got lost, and asked for help.</p> <p>The answer is what my coworker and I came up with (well, mostly my corworker).</p>
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