mirrors/CyberChef
1
0
Fork 0
mirror of https://github.com/gchq/CyberChef.git synced 2025-04-22 15:56:16 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

Deleted legacy Rotate module

Browse source
This commit is contained in:
Matt C 2018-04-03 22:51:50 +01:00
parent 4988ead918
commit 7e86f02e4e
1 changed files with 0 additions and 244 deletions
Download patch file Download diff file Expand all files Collapse all files

244
src/core/operations/legacy/Rotate.js
View file

@ -1,244 +0,0 @@
/**
* Bit rotation operations.
*
* @author n1474335 [n1474335@gmail.com]
* @copyright Crown Copyright 2016
* @license Apache-2.0
*
* @namespace
*
* @todo Support for UTF16
*/
const Rotate = {
/**
* @constant
* @default
*/
ROTATE_AMOUNT: 1,
/**
* @constant
* @default
*/
ROTATE_CARRY: false,
/**
* Runs rotation operations across the input data.
*
* @private
* @param {byteArray} data
* @param {number} amount
* @param {function} algo - The rotation operation to carry out
* @returns {byteArray}
*/
_rot: function(data, amount, algo) {
const result = [];
for (let i = 0; i < data.length; i++) {
let b = data[i];
for (let j = 0; j < amount; j++) {
b = algo(b);
}
result.push(b);
}
return result;
},
/**
* Rotate right operation.
*
* @param {byteArray} input
* @param {Object[]} args
* @returns {byteArray}
*/
runRotr: function(input, args) {
if (args[1]) {
return Rotate._rotrCarry(input, args[0]);
} else {
return Rotate._rot(input, args[0], Rotate._rotr);
}
},
/**
* Rotate left operation.
*
* @param {byteArray} input
* @param {Object[]} args
* @returns {byteArray}
*/
runRotl: function(input, args) {
if (args[1]) {
return Rotate._rotlCarry(input, args[0]);
} else {
return Rotate._rot(input, args[0], Rotate._rotl);
}
},
/**
* @constant
* @default
*/
ROT13_AMOUNT: 13,
/**
* @constant
* @default
*/
ROT13_LOWERCASE: true,
/**
* @constant
* @default
*/
ROT13_UPPERCASE: true,
/**
* ROT13 operation.
*
* @param {byteArray} input
* @param {Object[]} args
* @returns {byteArray}
*/
runRot13: function(input, args) {
let amount = args[2],
output = input,
chr,
rot13Lowercase = args[0],
rot13Upperacse = args[1];
if (amount) {
if (amount < 0) {
amount = 26 - (Math.abs(amount) % 26);
}
for (let i = 0; i < input.length; i++) {
chr = input[i];
if (rot13Upperacse && chr >= 65 && chr <= 90) { // Upper case
chr = (chr - 65 + amount) % 26;
output[i] = chr + 65;
} else if (rot13Lowercase && chr >= 97 && chr <= 122) { // Lower case
chr = (chr - 97 + amount) % 26;
output[i] = chr + 97;
}
}
}
return output;
},
/**
* @constant
* @default
*/
ROT47_AMOUNT: 47,
/**
* ROT47 operation.
*
* @author Matt C [matt@artemisbot.uk]
* @param {byteArray} input
* @param {Object[]} args
* @returns {byteArray}
*/
runRot47: function(input, args) {
let amount = args[0],
output = input,
chr;
if (amount) {
if (amount < 0) {
amount = 94 - (Math.abs(amount) % 94);
}
for (let i = 0; i < input.length; i++) {
chr = input[i];
if (chr >= 33 && chr <= 126) {
chr = (chr - 33 + amount) % 94;
output[i] = chr + 33;
}
}
}
return output;
},
/**
* Rotate right bitwise op.
*
* @private
* @param {byte} b
* @returns {byte}
*/
_rotr: function(b) {
const bit = (b & 1) << 7;
return (b >> 1) | bit;
},
/**
* Rotate left bitwise op.
*
* @private
* @param {byte} b
* @returns {byte}
*/
_rotl: function(b) {
const bit = (b >> 7) & 1;
return ((b << 1) | bit) & 0xFF;
},
/**
* Rotates a byte array to the right by a specific amount as a whole, so that bits are wrapped
* from the end of the array to the beginning.
*
* @private
* @param {byteArray} data
* @param {number} amount
* @returns {byteArray}
*/
_rotrCarry: function(data, amount) {
let carryBits = 0,
newByte,
result = [];
amount = amount % 8;
for (let i = 0; i < data.length; i++) {
const oldByte = data[i] >>> 0;
newByte = (oldByte >> amount) | carryBits;
carryBits = (oldByte & (Math.pow(2, amount)-1)) << (8-amount);
result.push(newByte);
}
result[0] |= carryBits;
return result;
},
/**
* Rotates a byte array to the left by a specific amount as a whole, so that bits are wrapped
* from the beginning of the array to the end.
*
* @private
* @param {byteArray} data
* @param {number} amount
* @returns {byteArray}
*/
_rotlCarry: function(data, amount) {
let carryBits = 0,
newByte,
result = [];
amount = amount % 8;
for (let i = data.length-1; i >= 0; i--) {
const oldByte = data[i];
newByte = ((oldByte << amount) | carryBits) & 0xFF;
carryBits = (oldByte >> (8-amount)) & (Math.pow(2, amount)-1);
result[i] = (newByte);
}
result[data.length-1] = result[data.length-1] | carryBits;
return result;
},
};
export default Rotate;