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    <p>The critical missing piece is the IV, which is required when encryption/decryption is to be made across language boundaries as apparently the encrypter will generate a random IV (or something like that - still don't understand how Ruby decrypts the string without an IV.... but then what do I know....), if one is not provided.</p> <p>The following snippets show how to encrypt a string in Ruby and decrypt in NodeJS.</p> <pre><code>#!/usr/bin/env ruby require 'openssl' require 'base64' require 'openssl/cipher' require 'openssl/digest' aes = OpenSSL::Cipher::Cipher.new('aes-256-cbc') aes.encrypt aes.key = Digest::SHA256.digest('IHazSekretKey') aes.iv = '1234567890123456' p Base64.encode64( aes.update('text to be encrypted') &lt;&lt; aes.final ) </code></pre> <p>The above prints: "eiLbdhFSFrDqvUJmjbUgwD8REjBRoRWWwHHImmMLNZA=\n"</p> <pre><code>#!/usr/bin/env node var crypto = require('crypto'); function decrypto(toDecryptStr) { var result, encoded = new Buffer(toDecryptStr, 'base64'), decodeKey = crypto.createHash('sha256').update('IHazSekretKey', 'ascii').digest(), decipher = crypto.createDecipheriv('aes-256-cbc', decodeKey, '1234567890123456'); result = decipher.update(encoded); result += decipher.final(); return result; } console.log(decrypto('eiLbdhFSFrDqvUJmjbUgwD8REjBRoRWWwHHImmMLNZA=\n')) </code></pre> <p>The JS script now properly decrypts the string.</p> <p>One unfortunate side effect is that existing encrypted data will need to be decrypted and then re-encrypted with an IV that is then used in the decrypting implementation. </p> <p>A PITA but nonetheless a working solution.</p>
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    1. CO"still don't understand how Ruby decrypts the string without an IV" > The IV defaults to null: http://www.ruby-doc.org/stdlib-1.9.3/libdoc/openssl/rdoc/OpenSSL/Cipher.html#method-i-decrypt Well done btw.
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    2. COAhh.. that explains it :). Thanks @Gerry.
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    3. COYou're very welcome. I actually though it might be an IV problem at first, however I couldn't seem to get it working in my testing, so I had figured it was something else. :)
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