Mirrors/CyberChef
2
0
Fork 0
mirror of https://github.com/gchq/CyberChef synced 2025-01-16 22:43:54 +00:00
Code Issues Projects Releases Packages Wiki Activity

Fixed 'From Base64' bug adding null bytes. Closes #1362

Browse source
This commit is contained in:
n1474335 2022-06-06 14:54:06 +01:00
parent 3f57711c39
commit 9ec94434bb
1 changed files with 8 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
src/core/lib/Base64.mjs
View file

@ -130,10 +130,11 @@ export function fromBase64(data, alphabet="A-Za-z0-9+/=", returnType="string", r
i = 0;
while (i < data.length) {
enc1 = alphabet.indexOf(data.charAt(i++));
enc2 = alphabet.indexOf(data.charAt(i++));
enc3 = alphabet.indexOf(data.charAt(i++));
enc4 = alphabet.indexOf(data.charAt(i++));
// Including `|| null` forces empty strings to null so that indexOf returns -1 instead of 0
enc1 = alphabet.indexOf(data.charAt(i++) || null);
enc2 = alphabet.indexOf(data.charAt(i++) || null);
enc3 = alphabet.indexOf(data.charAt(i++) || null);
enc4 = alphabet.indexOf(data.charAt(i++) || null);
if (strictMode && (enc1 < 0 || enc2 < 0 || enc3 < 0 || enc4 < 0)) {
throw new OperationError("Error: Base64 input contains non-alphabet char(s)");
@ -143,13 +144,13 @@ export function fromBase64(data, alphabet="A-Za-z0-9+/=", returnType="string", r
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
if (chr1 < 256) {
if (chr1 >= 0 && chr1 < 256) {
output.push(chr1);
}
if (chr2 < 256 && enc3 !== 64) {
if (chr2 >= 0 && chr2 < 256 && enc3 !== 64) {
output.push(chr2);
}
if (chr3 < 256 && enc4 !== 64) {
if (chr3 >= 0 && chr3 < 256 && enc4 !== 64) {
output.push(chr3);
}
}