54 lines
1.5 KiB
TypeScript
54 lines
1.5 KiB
TypeScript
/*
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This file is part of GNU Taler
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(C) 2021-2023 Taler Systems S.A.
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GNU Taler is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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*
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* @author Sebastian Javier Marchano (sebasjm)
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*/
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const encTable = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
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// base32 RFC 3548
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function encodeBase32(data: ArrayBuffer) {
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const dataBytes = new Uint8Array(data);
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let sb = "";
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const size = data.byteLength;
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let bitBuf = 0;
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let numBits = 0;
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let pos = 0;
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while (pos < size || numBits > 0) {
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if (pos < size && numBits < 5) {
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const d = dataBytes[pos++];
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bitBuf = (bitBuf << 8) | d;
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numBits += 8;
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}
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if (numBits < 5) {
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// zero-padding
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bitBuf = bitBuf << (5 - numBits);
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numBits = 5;
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}
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const v = (bitBuf >>> (numBits - 5)) & 31;
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sb += encTable[v];
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numBits -= 5;
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}
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return sb;
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}
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export function randomBase32Key(): string {
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var buf = new Uint8Array(20);
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window.crypto.getRandomValues(buf);
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return encodeBase32(buf);
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}
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