Class: PGP::RubyDecryptor

Inherits:
Object
  • Object
show all
Defined in:
lib/pgp/ruby_decryptor.rb

Class Method Summary collapse

Class Method Details

.decrypt(encrypted_text, private_key_file) ⇒ Object 



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# File 'lib/pgp/ruby_decryptor.rb', line 7

def self.decrypt(encrypted_text, private_key_file)
  bytes = PGP.string_to_bais(encrypted_text)
  dec_s = PGPUtil.get_decoder_stream(bytes)
  pgp_f = PGPObjectFactory.new(dec_s)

  enc_data = pgp_f.next_object
  enc_data = pgp_f.next_object unless PGPEncryptedDataList === enc_data

  data_enumerator = enc_data.get_encrypted_data_objects

  sec_key = nil
  pbe     = nil

  data_enumerator.each do |pubkey_enc_data|
    pbe     = pubkey_enc_data
    key_id  = pubkey_enc_data.get_key_id
    sec_key = PrivateKey.from_file(private_key_file, key_id)

    if sec_key.nil?
      # @todo: Should we notify Airbrake?
      Ace.logger.debug "This may be cause for concern. The data being decrypted has a key_id of '#{key_id}', which can not be found in the private key file '#{CE_Private_Key}'."
    else
      break
    end
  end

  clear = pbe.get_data_stream(sec_key, BC_Provider_Code)

  plain_fact = PGPObjectFactory.new(clear)

  message = plain_fact.next_object

  if(PGPCompressedData === message)
    pgp_fact  = PGPObjectFactory.new(message.get_data_stream)
    message   = pgp_fact.next_object
  end

  baos = ByteArrayOutputStream.new

  if(PGPLiteralData === message)
    unc = message.get_input_stream
    while((ch = unc.read) >= 0)
      baos.write(ch)
    end
  end

  baos.to_string
end