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XOR Brute Force operation now has a variable key length

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n1474335 2017-08-31 00:24:24 +01:00
parent d68523a54e
commit cb6708c02e
3 changed files with 44 additions and 20 deletions
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54
src/core/operations/BitwiseOp.js
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@ -91,7 +91,7 @@ const BitwiseOp = {
* @constant
* @default
*/
XOR_BRUTE_KEY_LENGTH: ["1", "2"],
XOR_BRUTE_KEY_LENGTH: 1,
/**
* @constant
* @default
@ -121,37 +121,61 @@ const BitwiseOp = {
* @returns {string}
*/
runXorBrute: function (input, args) {
const keyLength = parseInt(args[0], 10),
const keyLength = args[0],
sampleLength = args[1],
sampleOffset = args[2],
scheme = args[3],
nullPreserving = args[4],
printKey = args[5],
outputHex = args[6],
crib = args[7];
crib = args[7].toLowerCase();
let output = "",
let output = [],
result,
resultUtf8,
regex;
record = "";
input = input.slice(sampleOffset, sampleOffset + sampleLength);
if (crib !== "") {
regex = new RegExp(crib, "im");
}
if (self) self.sendStatusMessage("Calculating " + Math.pow(256, keyLength) + " values...");
/**
* Converts an integer to an array of bytes expressing that number.
*
* @param {number} int
* @param {number} len - Length of the resulting array
* @returns {array}
*/
const intToByteArray = (int, len) => {
let res = Array(len).fill(0);
for (let i = len - 1; i >= 0; i--) {
res[i] = int & 0xff;
int = int >>> 8;
}
return res;
};
for (let key = 1, l = Math.pow(256, keyLength); key < l; key++) {
result = BitwiseOp._bitOp(input, Utils.fromHex(key.toString(16)), BitwiseOp._xor, nullPreserving, scheme);
if (key % 10000 === 0) {
if (self) self.sendStatusMessage("Calculating " + l + " values... " + Math.floor(key / l * 100) + "%");
}
result = BitwiseOp._bitOp(input, intToByteArray(key, keyLength), BitwiseOp._xor, nullPreserving, scheme);
resultUtf8 = Utils.byteArrayToUtf8(result);
if (crib !== "" && resultUtf8.search(regex) === -1) continue;
if (printKey) output += "Key = " + Utils.hex(key, (2*keyLength)) + ": ";
if (outputHex) output += Utils.toHex(result) + "\n";
else output += Utils.printable(resultUtf8, false) + "\n";
if (printKey) output += "\n";
record = "";
if (crib && resultUtf8.toLowerCase().indexOf(crib) < 0) continue;
if (printKey) record += "Key = " + Utils.hex(key, (2*keyLength)) + ": ";
if (outputHex) {
record += Utils.toHex(result);
} else {
record += Utils.printable(resultUtf8, false);
}
output.push(record);
}
return output;
return output.join("\n");
},