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Merge branch 'Flavsditz-master'

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n1474335 2020-02-13 15:09:08 +00:00
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6
CHANGELOG.md
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@ -2,6 +2,9 @@
All major and minor version changes will be documented in this file. Details of patch-level version changes can be found in [commit messages](https://github.com/gchq/CyberChef/commits/master).
### [9.13.0] - 2020-02-13
- 'Rail Fence Cipher Encode' and 'Rail Fence Cipher Decode' operations added [@Flavsditz] | [#948]
### [9.12.0] - 2019-12-20
- 'Normalise Unicode' operation added [@matthieuxyz] | [#912]
@ -200,6 +203,7 @@ All major and minor version changes will be documented in this file. Details of
[9.13.0]: https://github.com/gchq/CyberChef/releases/tag/v9.13.0
[9.12.0]: https://github.com/gchq/CyberChef/releases/tag/v9.12.0
[9.11.0]: https://github.com/gchq/CyberChef/releases/tag/v9.11.0
[9.10.0]: https://github.com/gchq/CyberChef/releases/tag/v9.10.0
@ -286,6 +290,7 @@ All major and minor version changes will be documented in this file. Details of
[@VirtualColossus]: https://github.com/VirtualColossus
[@cbeuw]: https://github.com/cbeuw
[@matthieuxyz]: https://github.com/matthieuxyz
[@Flavsditz]: https://github.com/Flavsditz
[#95]: https://github.com/gchq/CyberChef/pull/299
[#173]: https://github.com/gchq/CyberChef/pull/173
@ -350,3 +355,4 @@ All major and minor version changes will be documented in this file. Details of
[#653]: https://github.com/gchq/CyberChef/pull/653
[#865]: https://github.com/gchq/CyberChef/pull/865
[#912]: https://github.com/gchq/CyberChef/pull/912
[#948]: https://github.com/gchq/CyberChef/pull/948

2
src/core/config/Categories.json
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@ -95,6 +95,8 @@
"Affine Cipher Decode",
"A1Z26 Cipher Encode",
"A1Z26 Cipher Decode",
"Rail Fence Cipher Encode",
"Rail Fence Cipher Decode",
"Atbash Cipher",
"Substitute",
"Derive PBKDF2 key",

88
src/core/operations/RailFenceCipherDecode.mjs Normal file
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@ -0,0 +1,88 @@
/**
* @author Flavio Diez [flaviofdiez+cyberchef@gmail.com]
* @copyright Crown Copyright 2020
* @license Apache-2.0
*/
import Operation from "../Operation.mjs";
import OperationError from "../errors/OperationError.mjs";
/**
* Rail Fence Cipher Decode operation
*/
class RailFenceCipherDecode extends Operation {
/**
* RailFenceCipherDecode constructor
*/
constructor() {
super();
this.name = "Rail Fence Cipher Decode";
this.module = "Ciphers";
this.description = "Decodes Strings that were created using the Rail fence Cipher provided a key and an offset";
this.infoURL = "https://wikipedia.org/wiki/Rail_fence_cipher";
this.inputType = "string";
this.outputType = "string";
this.args = [
{
name: "Key",
type: "number",
value: 2
},
{
name: "Offset",
type: "number",
value: 0
}
];
}
/**
* @param {string} input
* @param {Object[]} args
* @returns {string}
*/
run(input, args) {
const [key, offset] = args;
let cipher = input;
if (key < 2) {
throw new OperationError("Key has to be bigger than 2");
} else if (key > cipher.length) {
throw new OperationError("Key should be smaller than the cipher's length");
}
if (offset < 0) {
throw new OperationError("Offset has to be a positive integer");
}
const cycle = (key - 1) * 2;
const rest = cipher.length % key;
if (rest !== 0) {
cipher = cipher + (" ".repeat(key - rest));
}
const plaintext = new Array(cipher.length);
let j = 0;
let x, y;
for (y = 0; y < key; y++) {
for (x = 0; x < cipher.length; x++) {
if ((y + x + offset) % cycle === 0 || (y - x - offset) % cycle === 0) {
plaintext[x] = cipher[j++];
}
}
}
return plaintext.join("").trim();
}
}
export default RailFenceCipherDecode;

74
src/core/operations/RailFenceCipherEncode.mjs Normal file
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/**
* @author Flavio Diez [flaviofdiez+cyberchef@gmail.com]
* @copyright Crown Copyright 2020
* @license Apache-2.0
*/
import Operation from "../Operation.mjs";
import OperationError from "../errors/OperationError.mjs";
/**
* Rail Fence Cipher Encode operation
*/
class RailFenceCipherEncode extends Operation {
/**
* RailFenceCipherEncode constructor
*/
constructor() {
super();
this.name = "Rail Fence Cipher Encode";
this.module = "Ciphers";
this.description = "Encodes Strings using the Rail fence Cipher provided a key and an offset";
this.infoURL = "https://wikipedia.org/wiki/Rail_fence_cipher";
this.inputType = "string";
this.outputType = "string";
this.args = [
{
name: "Key",
type: "number",
value: 2
},
{
name: "Offset",
type: "number",
value: 0
}
];
}
/**
* @param {string} input
* @param {Object[]} args
* @returns {string}
*/
run(input, args) {
const [key, offset] = args;
const plaintext = input;
if (key < 2) {
throw new OperationError("Key has to be bigger than 2");
} else if (key > plaintext.length) {
throw new OperationError("Key should be smaller than the plain text's length");
}
if (offset < 0) {
throw new OperationError("Offset has to be a positive integer");
}
const cycle = (key - 1) * 2;
const rows = new Array(key).fill("");
for (let pos = 0; pos < plaintext.length; pos++) {
const rowIdx = key - 1 - Math.abs(cycle / 2 - (pos + offset) % cycle);
rows[rowIdx] += plaintext[pos];
}
return rows.join("").trim();
}
}
export default RailFenceCipherEncode;

110
tests/operations/tests/Ciphers.mjs
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@ -418,4 +418,114 @@ TestRegister.addTests([
}
],
},
{
name: "Rail Fence Cipher Decode: normal",
input: "Cytgah sTEAto rtn rsligcdsrporpyi H r fWiigo ovn oe",
expectedOutput: "Cryptography is THE Art of Writing or solving codes",
recipeConfig: [
{
"op": "Rail Fence Cipher Decode",
"args": [2, 0]
}
],
},
{
name: "Rail Fence Cipher Decode: key has to be bigger than 2",
input: "Cytgah sTEAto rtn rsligcdsrporpyi H r fWiigo ovn oe",
expectedOutput: "Key has to be bigger than 2",
recipeConfig: [
{
"op": "Rail Fence Cipher Decode",
"args": [1, 0]
}
],
},
{
name: "Rail Fence Cipher Decode: key has to be smaller than input's length",
input: "shortinput",
expectedOutput: "Key should be smaller than the cipher's length",
recipeConfig: [
{
"op": "Rail Fence Cipher Decode",
"args": [22, 0]
}
],
},
{
name: "Rail Fence Cipher Decode: offset should be positive",
input: "shortinput",
expectedOutput: "Offset has to be a positive integer",
recipeConfig: [
{
"op": "Rail Fence Cipher Decode",
"args": [2, -1]
}
],
},
{
name: "Rail Fence Cipher Decode: Normal with Offset non-null",
input: "51746026813793592840",
expectedOutput: "12345678901234567890",
recipeConfig: [
{
"op": "Rail Fence Cipher Decode",
"args": [4, 2]
}
],
},
{
name: "Rail Fence Cipher Encode: normal",
input: "Cryptography is THE Art of Writing or solving codes",
expectedOutput: "Cytgah sTEAto rtn rsligcdsrporpyi H r fWiigo ovn oe",
recipeConfig: [
{
"op": "Rail Fence Cipher Encode",
"args": [2, 0]
}
],
},
{
name: "Rail Fence Cipher Encode: key has to be bigger than 2",
input: "Cryptography is THE Art of Writing or solving codes",
expectedOutput: "Key has to be bigger than 2",
recipeConfig: [
{
"op": "Rail Fence Cipher Encode",
"args": [1, 0]
}
],
},
{
name: "Rail Fence Cipher Encode: key has to be smaller than input's length",
input: "shortinput",
expectedOutput: "Key should be smaller than the plain text's length",
recipeConfig: [
{
"op": "Rail Fence Cipher Encode",
"args": [22, 0]
}
],
},
{
name: "Rail Fence Cipher Encode: offset should be positive",
input: "shortinput",
expectedOutput: "Offset has to be a positive integer",
recipeConfig: [
{
"op": "Rail Fence Cipher Encode",
"args": [2, -1]
}
],
},
{
name: "Rail Fence Cipher Encode: Normal with Offset non-null",
input: "12345678901234567890",
expectedOutput: "51746026813793592840",
recipeConfig: [
{
"op": "Rail Fence Cipher Encode",
"args": [4, 2]
}
],
},
]);