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Merge pull request #1788 from EvieHarv/master

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a3957273 2024-04-13 22:24:10 +01:00 committed by GitHub
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6
src/core/lib/Ciphers.mjs
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@ -3,6 +3,7 @@
* *
* @author Matt C [matt@artemisbot.uk] * @author Matt C [matt@artemisbot.uk]
* @author n1474335 [n1474335@gmail.com] * @author n1474335 [n1474335@gmail.com]
* @author Evie H [evie@evie.sh]
* *
* @copyright Crown Copyright 2018 * @copyright Crown Copyright 2018
* @license Apache-2.0 * @license Apache-2.0
@ -10,6 +11,7 @@
*/ */
import OperationError from "../errors/OperationError.mjs"; import OperationError from "../errors/OperationError.mjs";
import Utils from "../Utils.mjs";
import CryptoJS from "crypto-js"; import CryptoJS from "crypto-js";
/** /**
@ -30,6 +32,10 @@ export function affineEncode(input, args) {
throw new OperationError("The values of a and b can only be integers."); throw new OperationError("The values of a and b can only be integers.");
} }
if (Utils.gcd(a, 26) !== 1) {
throw new OperationError("The value of `a` must be coprime to 26.");
}
for (let i = 0; i < input.length; i++) { for (let i = 0; i < input.length; i++) {
if (alphabet.indexOf(input[i]) >= 0) { if (alphabet.indexOf(input[i]) >= 0) {
// Uses the affine function ax+b % m = y (where m is length of the alphabet) // Uses the affine function ax+b % m = y (where m is length of the alphabet)

2
tests/browser/02_ops.js
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@ -37,7 +37,7 @@ module.exports = {
testOp(browser, ["From Hex", "Add Text To Image", "To Base64"], Images.PNG_HEX, Images.PNG_CHEF_B64, [[], ["Chef", "Center", "Middle", 0, 0, 16], []]); testOp(browser, ["From Hex", "Add Text To Image", "To Base64"], Images.PNG_HEX, Images.PNG_CHEF_B64, [[], ["Chef", "Center", "Middle", 0, 0, 16], []]);
testOp(browser, "Adler-32 Checksum", "test input", "16160411"); testOp(browser, "Adler-32 Checksum", "test input", "16160411");
testOp(browser, "Affine Cipher Decode", "test input", "rcqr glnsr", [1, 2]); testOp(browser, "Affine Cipher Decode", "test input", "rcqr glnsr", [1, 2]);
testOp(browser, "Affine Cipher Encode", "test input", "njln rbfpn", [2, 1]); testOp(browser, "Affine Cipher Encode", "test input", "gndg zoujg", [3, 1]);
testOp(browser, "AMF Decode", "\u000A\u0013\u0001\u0003a\u0006\u0009test", /"\$value": "test"/); testOp(browser, "AMF Decode", "\u000A\u0013\u0001\u0003a\u0006\u0009test", /"\$value": "test"/);
testOp(browser, "AMF Encode", '{"a": "test"}', "\u000A\u0013\u0001\u0003a\u0006\u0009test"); testOp(browser, "AMF Encode", '{"a": "test"}', "\u000A\u0013\u0001\u0003a\u0006\u0009test");
testOp(browser, "Analyse hash", "0123456789abcdef", /CRC-64/); testOp(browser, "Analyse hash", "0123456789abcdef", /CRC-64/);