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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.deriveRecoveryKeyFromPassphrase = deriveRecoveryKeyFromPassphrase;
/*
* Copyright 2024 The Matrix.org Foundation C.I.C.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
const DEFAULT_BIT_SIZE = 256;
/**
* Derive a recovery key from a passphrase and salt using PBKDF2.
*
* @param passphrase - The passphrase to derive the key from
* @param salt - The salt to use in the derivation
* @param iterations - The number of iterations to use in the derivation
* @param numBits - The number of bits to derive
*/
async function deriveRecoveryKeyFromPassphrase(passphrase, salt, iterations, numBits = DEFAULT_BIT_SIZE) {
if (!globalThis.crypto.subtle || !TextEncoder) {
throw new Error("Password-based backup is not available on this platform");
}
const key = await globalThis.crypto.subtle.importKey("raw", new TextEncoder().encode(passphrase), {
name: "PBKDF2"
}, false, ["deriveBits"]);
const keybits = await globalThis.crypto.subtle.deriveBits({
name: "PBKDF2",
salt: new TextEncoder().encode(salt),
iterations: iterations,
hash: "SHA-512"
}, key, numBits);
return new Uint8Array(keybits);
}