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POAES/CBC/PKCS5Padding implementation in Ruby (for rails)
 

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    <p>I need to decrypt text encrypted using <code>AES/CBC/PKCS5Padding</code> scheme. The encrypted text I got was generated using some Java software.</p> <p>All values below are changed by me to something fictional.</p> <p>What I get is a Key <code>aHjgYFutF672eGIUGGVlgSETyM9VJj0K</code> (256-bit = 32-chars * 8-bit) and IV: <code>rxYoks3c8hRRsL2P</code> (16-bit)</p> <p>and (I supposed) Base64 encoded encrypted result <code>ETlAHS5ZcshKxQUaHVB8==</code></p> <p>What I need is to decrypt in Ruby this <code>ETlAHS5ZcshKxQUaHVB8==</code> to get in the and a simple string, like 'blablablabla'</p> <p>I tried to decrypt what I got using both Ruby and just common linux console openssl command. NOTE: Key and IV below are not the ones used in real code:</p> <pre><code># require 'openssl' # require 'base64' # decryption aes = OpenSSL::Cipher::AES256.new(:CBC) aes.decrypt aes.padding = 1 # actually it's on by default aes.key = "aHjgYFutF672eGIUGGVlgSETyM9VJj0K" aes.iv="rxYoks3c8hRRsL2P" aes.update(Base64::decode64("ETlAHS5ZcshKxQUaHVB8=="))+aes.final =&gt; OpenSSL::Cipher::CipherError: bad decrypt </code></pre> <p>Same as above but in console, key and iv converted to hex with:</p> <pre><code>$ echo -n $key256 | hexdump -e '16/1 "%02x"' $ echo -n $iv | hexdump -e '16/1 "%02x"' $ echo "ETlAHS5ZcshKxQUaHVB8==" | openssl enc -d -aes-256-cbc -a -K 61486a675946757446363732654749554747566c67534554794d39564a6a304b -iv 7278596f6b73336338685252734c3250 bad decrypt 140378046432928:error:06065064:digital envelope routines:EVP_DecryptFinal_ex:bad decrypt:evp_enc.c:539: </code></pre> <p>BTW. to get back original key and iv in the console you an use:</p> <pre><code>$ echo 61486a6... | xxd -r -p #or , but then need to add \x before every character pair $ eval `printf "\x61\x48......" </code></pre> <p>Please give me some clues as I hoped in the beginning that I will be able to use <a href="https://github.com/chicks/aes" rel="nofollow">https://github.com/chicks/aes</a> gem. The gem seems fine, it's just a nice wrapper for <code>OpenSSL::Cipher::Cipher</code>.</p> <p>Is it possible that ruby/openssl use different PKCS, let's say PKCS#7, Java uses PKCS#5 and I need to preprocess my data ? Or there is a vesion mismatch between ruby/openssl and that Java's PKCS #7 and #5? #5 is meant for 8byte data blocks and #7 is for 16byte? Just a wild guess ...</p>
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    1. COHave you looked at this? http://stackoverflow.com/questions/2506547/aes-java-encoding-ruby-decoding
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    2. COYes of course, the problem is that I can't decrypt Java encrypted (AES/CBC/PKCS5) text using Ruby and/or command line openssl. I get 'Bad decrypt' error. Is it possible that my Ruby code or openssl fired up from a bash console use PKCS#1 which works in a different way than PKCS#5 ?
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    3. COUpdated my first post with more explanatory description of the problem.
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