From: Felipe Coury <felipe.coury@...>
Date: 2009-03-24T15:35:25+09:00
Subject: Re: Mimic AES_ENCRYPT and AES_DECRYPT functions in Ruby

Just as a FYI, it works!!!

I forgot about the remains... Take a look at the final incarnation:

def mysql_key(key)
  # The algorithm just creates a 16 byte buffer set to all zero,
  final_key = "\0" * 16

  # Number of string "blocks"
  blocks, remain = key.length.divmod(16)

  blocks.times do |i|
    # For each block
    key_block = key[i*16, 16]

    # Runs bitwise XOR for each char on string
    # and the same char on the block
    16.times do |j|
      final_key[j] ^= key_block[j]
    end
  end

  if remain
    remain.times do |i|
      final_key[i] ^= key[(blocks * 16) + i]
    end
  end

  final_key
end

And:

>> mkey = mysql_key(key)
=> "dp&!{\021?pK?G!8[r."
>> decrypt(mkey, User.find(1).password)
  User Load (2.9ms)   SELECT * FROM `users` WHERE (`users`.`id` = 1)
=> "password"

Just BEATIFUL!

Thanks a lot everyone!
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