mirrors/CyberChef
1
0
Fork 0
mirror of https://github.com/gchq/CyberChef.git synced 2025-04-21 15:26:16 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

More error checking to conform to the new tests

Browse source
This commit is contained in:
Barry Brown 2024-06-14 03:44:35 +00:00
parent ca3aef7b85
commit 7806fd999a
1 changed files with 16 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

16
src/core/lib/Ciphers.mjs
View file

@ -65,6 +65,9 @@ export function affineEncode(input, args) {
* @returns {string}
*/
export function affineApplication(input, a, b, alphabet, affineFn) {
if (alphabet === "")
throw new OperationError("The alphabet cannot be empty.");
alphabet = Utils.expandAlphRange(alphabet);
let output = "";
const modulus = alphabet.length;
@ -166,6 +169,19 @@ export function affineEncrypt(input, a, b, alphabet="a-z") {
* @returns {string}
*/
export function affineDecrypt(input, a, b, alphabet="a-z") {
// Because we are calculating the modulus and inverses here, we have to perform
// many of the same tests that the affineApplication function does.
// TODO: figure out a way to avoid doing the tests twice.
// Idea: make a checkInputs function.
// Idea: move the tests into the affineEncrypt and affineDecryptInverse functions
// so that affineApplication assumes valid inputs
if (alphabet === "")
throw new OperationError("The alphabet cannot be empty.");
if (!/^\+?(0|[1-9]\d*)$/.test(a) || !/^\+?(0|[1-9]\d*)$/.test(b)) {
throw new OperationError("The values of a and b can only be integers.");
}
const m = Utils.expandAlphRange(alphabet).length;
if (Utils.gcd(a, m) !== 1)
throw new OperationError("The value of `a` (" + a + ") must be coprime to " + m + ".");