Class: FF1::Cipher

Inherits:
Object
  • Object
show all
Defined in:
lib/ff1/cipher.rb

Constant Summary collapse

ROUNDS = 
10

Instance Method Summary collapse

Constructor Details

#initialize(key, radix = 10, mode = Modes::REVERSIBLE) ⇒ Cipher

Returns a new instance of Cipher.



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# File 'lib/ff1/cipher.rb', line 8

def initialize(key, radix = 10, mode = Modes::REVERSIBLE)
  @key = key
  @radix = radix
  @mode = mode
  @irreversible_salt = generate_irreversible_salt if @mode == Modes::IRREVERSIBLE
  validate_parameters
end

Instance Method Details

#decrypt(ciphertext, tweak = '') ⇒ Object 



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# File 'lib/ff1/cipher.rb', line 26

def decrypt(ciphertext, tweak = '')
  if @mode == Modes::IRREVERSIBLE
    raise FF1::Error, 'Cannot decrypt in irreversible mode - data is permanently transformed'
  end

  reversible_decrypt(ciphertext, tweak)
end

#encrypt(plaintext, tweak = '') ⇒ Object 



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# File 'lib/ff1/cipher.rb', line 16

def encrypt(plaintext, tweak = '')
  validate_input(plaintext)

  if @mode == Modes::IRREVERSIBLE
    irreversible_encrypt(plaintext, tweak)
  else
    reversible_encrypt(plaintext, tweak)
  end
end

#irreversible? ⇒ Boolean

Check if the cipher is in irreversible mode

Returns:

  • (Boolean) 


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# File 'lib/ff1/cipher.rb', line 40

def irreversible?
  @mode == Modes::IRREVERSIBLE
end

#reversible? ⇒ Boolean

Check if the cipher is in reversible mode

Returns:

  • (Boolean) 


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# File 'lib/ff1/cipher.rb', line 35

def reversible?
  @mode == Modes::REVERSIBLE
end