Class: Cryptor::SymmetricEncryption

Inherits:
Object
  • Object
show all
Defined in:
lib/cryptor/symmetric_encryption.rb

Overview

Easy-to-use authenticated symmetric encryption

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(key) ⇒ SymmetricEncryption

Returns a new instance of SymmetricEncryption.



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# File 'lib/cryptor/symmetric_encryption.rb', line 13

def initialize(key)
  @key = key
end

Class Method Details

.random_key(cipher) ⇒ Object 



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# File 'lib/cryptor/symmetric_encryption.rb', line 9

def self.random_key(cipher)
  Cipher[cipher].random_key
end

Instance Method Details

#decrypt(ciphertext) ⇒ Object 



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# File 'lib/cryptor/symmetric_encryption.rb', line 30

def decrypt(ciphertext)
  begin
    message = ORDO::Message.parse(ciphertext)
  rescue ORDO::ParseError => ex
    raise InvalidMessageError, ex.to_s
  end

  fingerprint = message['Key-Fingerprint']
  fail ArgumentError, "no key configured for: #{fingerprint}" if @key.fingerprint != fingerprint

  @key.decrypt message.body
end

#encrypt(plaintext) ⇒ Object 



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# File 'lib/cryptor/symmetric_encryption.rb', line 17

def encrypt(plaintext)
  ciphertext = @key.encrypt(plaintext)
  base64     = Base64.strict_encode64(ciphertext)

  ORDO::Message.new(
    base64,
    'Cipher'                    => @key.cipher.algorithm,
    'Content-Length'            => base64.bytesize,
    'Content-Transfer-Encoding' => 'base64',
    'Key-Fingerprint'           => @key.fingerprint
  ).to_string
end