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XOR operation now supports both input and output differentials. Fixes #17

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This commit is contained in:
n1474335 2016-12-03 01:42:23 +00:00
parent fc9d0a63c2
commit 20d9903572
7 changed files with 47 additions and 39 deletions
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23
src/js/operations/BitwiseOp.js
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@ -19,10 +19,10 @@ var BitwiseOp = {
* @param {byte_array} key
* @param {function} func - The bitwise calculation to carry out
* @param {boolean} null_preserving
* @param {boolean} differential
* @param {string} scheme
* @returns {byte_array}
*/
_bit_op: function (input, key, func, null_preserving, differential) {
_bit_op: function (input, key, func, null_preserving, scheme) {
if (!key || !key.length) key = [0];
var result = [],
x = null,
@ -34,8 +34,15 @@ var BitwiseOp = {
o = input[i];
x = null_preserving && (o === 0 || o == k) ? o : func(o, k);
result.push(x);
if (differential && !(null_preserving && (o === 0 || o == k))) {
key[i % key.length] = x;
if (scheme != "Standard" && !(null_preserving && (o === 0 || o == k))) {
switch (scheme) {
case "Input differential":
key[i % key.length] = x;
break;
case "Output differential":
key[i % key.length] = o;
break;
}
}
}
@ -52,7 +59,7 @@ var BitwiseOp = {
* @constant
* @default
*/
XOR_DIFFERENTIAL: false,
XOR_SCHEME: ["Standard", "Input differential", "Output differential"],
/**
* @constant
* @default
@ -68,12 +75,12 @@ var BitwiseOp = {
*/
run_xor: function (input, args) {
var key = Utils.format[args[0].option].parse(args[0].string || ""),
null_preserving = args[1],
differential = args[2];
scheme = args[1],
null_preserving = args[2];
key = Utils.word_array_to_byte_array(key);
return BitwiseOp._bit_op(input, key, BitwiseOp._xor, null_preserving, differential);
return BitwiseOp._bit_op(input, key, BitwiseOp._xor, null_preserving, scheme);
},