TOTPFit/lib/totp-quickjs/base32decoder.js

46 lines
1.3 KiB
JavaScript

export function decode(base32) {
for (
var base32chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567",
bits = "",
hex = "",
i = 0;
i < base32.length;
i++
) {
var val = base32chars.indexOf(base32.charAt(i).toUpperCase());
bits += leftpad(val.toString(2), 5, "0");
}
for (i = 0; i + 4 <= bits.length; i += 4) {
var chunk = bits.substr(i, 4);
hex += parseInt(chunk, 2).toString(16);
}
return hex;
}
function leftpad(str, len, pad) {
return (
len + 1 >= str.length &&
(str = new Array(len + 1 - str.length).join(pad) + str),
str
);
}
export function base64decode(base64String) {
var sliceSize = 1024;
var byteCharacters = window.atob(base64String);
var bytesLength = byteCharacters.length;
var slicesCount = Math.ceil(bytesLength / sliceSize);
var byteArrays = new Array(slicesCount);
for (var sliceIndex = 0; sliceIndex < slicesCount; ++sliceIndex) {
var begin = sliceIndex * sliceSize;
var end = Math.min(begin + sliceSize, bytesLength);
var bytes = new Array(end - begin);
for (var offset = begin, i = 0; offset < end; ++i, ++offset) {
bytes[i] = byteCharacters[offset].charCodeAt(0);
}
byteArrays[sliceIndex] = new Uint8Array(bytes);
}
return byteArrays
}