Module: ToyOre::Scheme

Defined in:
lib/toy_ore/scheme.rb

Defined Under Namespace

Classes: LeftCiphertext, OreCiphertext, OreScheme, RightCiphertext

Class Method Summary collapse

Class Method Details

.compare_ciphertexts(left_ciphertext, right_ciphertext) ⇒ Object

eg

1

pry(ToyOre::Scheme)> iv

> 416

2

pry(ToyOre::Scheme)> key

> 208

3

pry(ToyOre::Scheme)> iv ^ key

> 368

4

pry(ToyOre::Scheme)> (iv ^ key) ^ cmp_result

> -369

5

pry(ToyOre::Scheme)> (iv ^ key) ^ -369

> -1



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# File 'lib/toy_ore/scheme.rb', line 75

def self.compare_ciphertexts(left_ciphertext, right_ciphertext)
  (right_ciphertext.iv ^ left_ciphertext.key) ^ right_ciphertext.encryptions[left_ciphertext.offset]
end

.compare_plaintexts(a, b) ⇒ Object

Compares 2 plaintexts and returns a cmp_result. If a < b = -1 If a == b = 0 if a > b = 1

Parameters:

  • a (Integer) —

    A plaintext integer value

  • b (Integer) —

    A plaintext integer value



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# File 'lib/toy_ore/scheme.rb', line 32

def self.compare_plaintexts(a, b)
  if a < b
    return -1
  elsif a == b
    return 0
  else
    return 1
  end
end

.encrypt(iv, key, cmp_result) ⇒ Integer

Encrypts a comparison result by XOR’ing the iv and key. Then XORing that result with the comparaison result.

Uses an IV for non-determinism.

A Boolean logic operation that compares two input bits and generates one output bit. If the bits are the same, the result is 0. If the bits are different, the result is 1. ^ represents the xor operator

Parameters:

  • iv (Integer)
  • key (Integer)
  • cmp_result (Integer) —

    -1, 0, 1

Returns:

  • (Integer) 


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# File 'lib/toy_ore/scheme.rb', line 18

def self.encrypt(iv, key, cmp_result)
  (iv ^ key) ^ cmp_result
end