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/*
This file is part of GNU Taler
(C) 2024 Taler Systems SA
GNU Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
import { getRandomBytes } from "./taler-crypto.js";
const encTable = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
/**
* base32 RFC 3548
*/
export function encodeRfc3548Base32(data: ArrayBuffer) {
const dataBytes = new Uint8Array(data);
let sb = "";
const size = data.byteLength;
let bitBuf = 0;
let numBits = 0;
let pos = 0;
while (pos < size || numBits > 0) {
if (pos < size && numBits < 5) {
const d = dataBytes[pos++];
bitBuf = (bitBuf << 8) | d;
numBits += 8;
}
if (numBits < 5) {
// zero-padding
bitBuf = bitBuf << (5 - numBits);
numBits = 5;
}
const v = (bitBuf >>> (numBits - 5)) & 31;
sb += encTable[v];
numBits -= 5;
}
return sb;
}
export function isRfc3548Base32Charset(s: string): boolean {
for (let idx = 0; idx < s.length; idx++) {
const c = s.charAt(idx);
if (encTable.indexOf(c) === -1) return false;
}
return true;
}
export function randomRfc3548Base32Key(): string {
const buf = getRandomBytes(20);
return encodeRfc3548Base32(buf);
}
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