From: Felipe Coury <felipe.coury@...>
Date: 2009-03-24T14:31:51+09:00
Subject: Re: Mimic AES_ENCRYPT and AES_DECRYPT functions in Ruby

Giovanni / Rob,

Thanks a lot for your responses, really.

Unfortunately, it it still doesn't work. I tried what you both 
suggested, take a look at this console transcript:

>> def aes(m,k,t)
>>   (aes = OpenSSL::Cipher::AES128.new("ECB").send(m)).key = k
>>   aes.update(t) << aes.final
>> end
=> nil
>> 
?> def encrypt(key, text)
>>   aes(:encrypt, key, text)
>> end
=> nil
>> 
?> def decrypt(key, text)
>>   aes(:decrypt, key, text)
>> end
=> nil

>> key = "82pjd12398JKBSDIGUSisahdoahOUASDHsdapdjqwjeASIduAsdh078asdASD087asdADSsdjhA7809asdajhADSs"
=> 
"82pjd12398JKBSDIGUSisahdoahOUASDHsdapdjqwjeASIduAsdh078asdASD087asdADSsdjhA7809asdajhADSs"

>> u = User.find(1)
=> #<User id: 1, name: "John Doe", password: 
"###\270##\206流5\202?\003\021###", created_at: "2009-03-23 20:31:43", 
updated_at: "2009-03-23 20:31:43">
>> u.password.length
=> 16

>> decrypt(key, u.password)
OpenSSL::CipherError: bad decrypt
        from (irb):8:in `final'
        from (irb):8:in `aes'
        from (irb):16:in `decrypt'
        from (irb):19

>> decrypt(key, [u.password].pack("H*"))
OpenSSL::CipherError: wrong final block length
        from (irb):8:in `final'
        from (irb):8:in `aes'
        from (irb):16:in `decrypt'
        from (irb):32

>> [u.password].pack("H*").length
=> 8
>> card = ([u.password].pack("H*") + ("\0" * 8))
=> "9##n###\005\000\000\000\000\000\000\000\000"
>> decrypt(key, card)
OpenSSL::CipherError: bad decrypt
        from (irb):8:in `final'
        from (irb):8:in `aes'
        from (irb):16:in `decrypt'
        from (irb):43

Any other ideas?

Thanks,

-- Felipe
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