Zenomorph8

An homomorphic encryption single file encrypter in plain ECMAScript (Javascript). For now only encrypts 8 bits integers (UTF8 works fine too with one extension like for japanese characters).

Usage

Include the file in anyway you want. Then use :

key = [153,123,12,52]; // Any number under 255 is fine but floating point are kinda OK, higher number or very precise floating point value put you at risk of loss of precision. Any length is fine.
salt = [31,25,65,14]; // Same as for the key, but the length needs to match the one of the key. This requirement may be suppressed.

line = "This will be encrypted even in 日本語(japanese) ";

my_array = line.split("").map(function(char) {
  return char.charCodeAt(0);
  });

cipher = crypt8(my_array,key,salt);
// cipher now contains an array of floating points numbers
// I forgot the '.' at the end, lets change the space to a period. A space is 32, a period 46.
cipher=add8(cipher,44,18,key,salt); // key is used only for generating a cipher of 18. this will be implemented next as 2 function, 1 to generate a ciphered  delta and one for applying it.
deciphered = decrypt8(cipher,key,salt);

my_result = "";
deciphered.map(function(char) {
  my_result+=String.fromCharCode(char);
});

// my_result now contains "This will be encrypted even in 日本語(japanese)." (notice the period)

The behaviour is OK with numbers below 2^15 even with multiplication.

If you manage to decipher this without the key, contact me ASAP :

[0.94169999999999998, 8.0808, 2.0608, 8.5565999999999995, 1.4319000000000002, 8.3868000000000009, 2.0608, 8.5244, 1.3028999999999999, 7.9787999999999997, 2.1899999999999999, 8.1471999999999998, 1.4964, 8.1216000000000008, 2.1995, 8.5289999999999999, 0.4128, 7.4892000000000003, 2.0608, 8.4461999999999993, 1.4060999999999999, 6.6528, 2.1842999999999999, 8.5060000000000002, 0.4128, 8.1419999999999995, 2.1899999999999999, 8.4830000000000005, 1.4319000000000002, 8.3663999999999987, 2.0874000000000001, 8.1471999999999998, 1.0707, 8.0603999999999996, 2.2090000000000001, 8.4600000000000009, 0.4128, 8.2235999999999994, 2.1919, 8.1471999999999998, 1.4964, 8.1216000000000008, 2.1995, 8.5289999999999999, 0.4128, 8.2644000000000002, 2.2090000000000001, 8.1471999999999998, 0.8256, 7.5503999999999998, 2.2223000000000002, 8.4600000000000009, 1.4319000000000002, 8.4071999999999996, 2.1995, 8.4554000000000009, 0.98040000000000005, 7.9787999999999997, 2.1957, 8.1471999999999998, 1.4319000000000002, 8.2439999999999998, 2.0608, 8.3864000000000001, 1.5351000000000001, 8.1419999999999995, 2.2204000000000002, 8.5335999999999999, 1.3028999999999999, 8.3255999999999997, 2.0608, 8.2667999999999999, 0.4128, 7.8360000000000003, 2.1463000000000001, 8.2576000000000001, 1.032, 7.5503999999999998, 2.1501000000000001, 8.4047999999999998, 0.59340000000000004, 6]

The salt for this is : [0,6,2,8]