/* globals CryptoJS */
/**
* Bitwise operations.
*
* @author n1474335 [n1474335@gmail.com]
* @copyright Crown Copyright 2016
* @license Apache-2.0
*
* @namespace
*/
var BitwiseOp = {
/**
* Runs bitwise operations across the input data.
*
* @private
* @param {byte_array} input
* @param {byte_array} key
* @param {function} func - The bitwise calculation to carry out
* @param {boolean} null_preserving
* @param {boolean} differential
* @returns {byte_array}
*/
_bit_op: function (input, key, func, null_preserving, differential) {
if (!key || !key.length) key = [0];
var result = [],
x = null,
k = null,
o = null;
for (var i = 0; i < input.length; i++) {
k = key[i % key.length];
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;
}
}
return result;
},
/**
* @constant
* @default
*/
XOR_PRESERVE_NULLS: false,
/**
* @constant
* @default
*/
XOR_DIFFERENTIAL: false,
/**
* @constant
* @default
*/
KEY_FORMAT: ["Hex", "Base64", "UTF8", "UTF16", "UTF16LE", "UTF16BE", "Latin1"],
/**
* XOR operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {byte_array}
*/
run_xor: function (input, args) {
var key = Utils.format[args[0].option].parse(args[0].string || ""),
null_preserving = args[1],
differential = args[2];
key = Utils.word_array_to_byte_array(key);
return BitwiseOp._bit_op(input, key, BitwiseOp._xor, null_preserving, differential);
},
/**
* @constant
* @default
*/
XOR_BRUTE_KEY_LENGTH: ["1", "2"],
/**
* @constant
* @default
*/
XOR_BRUTE_SAMPLE_LENGTH: 100,
/**
* @constant
* @default
*/
XOR_BRUTE_SAMPLE_OFFSET: 0,
/**
* @constant
* @default
*/
XOR_BRUTE_PRINT_KEY: true,
/**
* @constant
* @default
*/
XOR_BRUTE_OUTPUT_HEX: false,
/**
* XOR Brute Force operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {string}
*/
run_xor_brute: function (input, args) {
var key_length = parseInt(args[0], 10),
sample_length = args[1],
sample_offset = args[2],
null_preserving = args[3],
differential = args[4],
crib = args[5],
print_key = args[6],
output_hex = args[7],
regex;
var output = "",
result,
result_utf8;
input = input.slice(sample_offset, sample_offset + sample_length);
if (crib !== "") {
regex = new RegExp(crib, "im");
}
for (var key = 1, l = Math.pow(256, key_length); key < l; key++) {
result = BitwiseOp._bit_op(input, Utils.hex_to_byte_array(key.toString(16)), BitwiseOp._xor, null_preserving, differential);
result_utf8 = Utils.byte_array_to_utf8(result);
if (crib !== "" && result_utf8.search(regex) === -1) continue;
if (print_key) output += "Key = " + Utils.hex(key, (2*key_length)) + ": ";
if (output_hex)
output += Utils.byte_array_to_hex(result) + "\n";
else
output += Utils.printable(result_utf8, false) + "\n";
if (print_key) output += "\n";
}
return output;
},
/**
* NOT operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {byte_array}
*/
run_not: function (input, args) {
return BitwiseOp._bit_op(input, null, BitwiseOp._not);
},
/**
* AND operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {byte_array}
*/
run_and: function (input, args) {
var key = Utils.format[args[0].option].parse(args[0].string || "");
key = Utils.word_array_to_byte_array(key);
return BitwiseOp._bit_op(input, key, BitwiseOp._and);
},
/**
* OR operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {byte_array}
*/
run_or: function (input, args) {
var key = Utils.format[args[0].option].parse(args[0].string || "");
key = Utils.word_array_to_byte_array(key);
return BitwiseOp._bit_op(input, key, BitwiseOp._or);
},
/**
* ADD operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {byte_array}
*/
run_add: function (input, args) {
var key = Utils.format[args[0].option].parse(args[0].string || "");
key = Utils.word_array_to_byte_array(key);
return BitwiseOp._bit_op(input, key, BitwiseOp._add);
},
/**
* SUB operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {byte_array}
*/
run_sub: function (input, args) {
var key = Utils.format[args[0].option].parse(args[0].string || "");
key = Utils.word_array_to_byte_array(key);
return BitwiseOp._bit_op(input, key, BitwiseOp._sub);
},
/**
* XOR bitwise calculation.
*
* @private
* @param {number} operand
* @param {number} key
* @returns {number}
*/
_xor: function (operand, key) {
return operand ^ key;
},
/**
* NOT bitwise calculation.
*
* @private
* @param {number} operand
* @returns {number}
*/
_not: function (operand, _) {
return ~operand & 0xff;
},
/**
* AND bitwise calculation.
*
* @private
* @param {number} operand
* @param {number} key
* @returns {number}
*/
_and: function (operand, key) {
return operand & key;
},
/**
* OR bitwise calculation.
*
* @private
* @param {number} operand
* @param {number} key
* @returns {number}
*/
_or: function (operand, key) {
return operand | key;
},
/**
* ADD bitwise calculation.
*
* @private
* @param {number} operand
* @param {number} key
* @returns {number}
*/
_add: function (operand, key) {
return (operand + key) % 256;
},
/**
* SUB bitwise calculation.
*
* @private
* @param {number} operand
* @param {number} key
* @returns {number}
*/
_sub: function (operand, key) {
var result = operand - key;
return (result < 0) ? 256 + result : result;
},
};
CyberChef