Class: Ciphr::Functions::OpenSSL::OpenSslCipher

Inherits:
InvertibleFunction show all
Defined in:
lib/ciphr/functions/openssl.rb

Instance Attribute Summary

Attributes inherited from InvertibleFunction

#invert

Attributes inherited from Function

#args, #options

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from InvertibleFunction

invertable?

Methods inherited from Function

aligned, inherited, #initialize, invertable?, #prepend, #read

Constructor Details

This class inherits a constructor from Ciphr::Functions::Function

Class Method Details

.params ⇒ Object 



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# File 'lib/ciphr/functions/openssl.rb', line 100

def self.params 
  [:input, :key]
end

.variants ⇒ Object 



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# File 'lib/ciphr/functions/openssl.rb', line 94

def self.variants
  OpenSSL::Cipher.ciphers.map{|c| c.downcase}.uniq.map do |c|
    [[c, c.gsub(/-/, "")], {:variant => c}]
  end
end

Instance Method Details

#apply ⇒ Object 



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# File 'lib/ciphr/functions/openssl.rb', line 59

def apply
  input, key = @args
  cipher = OpenSSL::Cipher.new(@options[:variant])
  cipher.send(invert ? :decrypt : :encrypt)
  cipher.key = key.read
  random_iv = cipher.random_iv
  if random_iv.size > 0
    cipher.iv = invert ? input.read(random_iv.size) : random_iv
  end
  Proc.new do
    if ! invert && random_iv
      begin
        random_iv
      ensure
        random_iv = nil
      end
    else
      chunk = input.read(256)
      if cipher
        if chunk
          cipher.update(chunk)
        else
          begin
            cipher.final
          ensure
            cipher = nil
          end
        end
      else
        nil
      end
    end
  end
end