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fix: ROT13 - shifting numbers by negative amounts

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Fixes https://github.com/gchq/CyberChef/issues/1886.
This commit is contained in:
Francisco Pombal 2024-09-15 23:51:48 +01:00
parent d635cca210
commit 7e5eb01a5e
2 changed files with 89 additions and 11 deletions
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7
src/core/operations/ROT13.mjs
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@ -59,15 +59,16 @@ class ROT13 extends Operation {
rot13Upperacse = args[1],
rotNumbers = args[2];
let amount = args[3],
chr;
amountNumbers = args[3];
if (amount) {
if (amount < 0) {
amount = 26 - (Math.abs(amount) % 26);
amountNumbers = 10 - (Math.abs(amountNumbers) % 10);
}
for (let i = 0; i < input.length; i++) {
chr = input[i];
let chr = input[i];
if (rot13Upperacse && chr >= 65 && chr <= 90) { // Upper case
chr = (chr - 65 + amount) % 26;
output[i] = chr + 65;
@ -75,7 +76,7 @@ class ROT13 extends Operation {
chr = (chr - 97 + amount) % 26;
output[i] = chr + 97;
} else if (rotNumbers && chr >= 48 && chr <= 57) { // Numbers
chr = (chr - 48 + amount) % 10;
chr = (chr - 48 + amountNumbers) % 10;
output[i] = chr + 48;
}
}