43 lines
1.7 KiB
JavaScript
43 lines
1.7 KiB
JavaScript
/*
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* Copyright 2024 The Matrix.org Foundation C.I.C.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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const DEFAULT_BIT_SIZE = 256;
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/**
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* Derive a recovery key from a passphrase and salt using PBKDF2.
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* @see https://spec.matrix.org/v1.11/client-server-api/#deriving-keys-from-passphrases
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*
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* @param passphrase - The passphrase to derive the key from
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* @param salt - The salt to use in the derivation
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* @param iterations - The number of iterations to use in the derivation
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* @param numBits - The number of bits to derive
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*/
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export async function deriveRecoveryKeyFromPassphrase(passphrase, salt, iterations, numBits = DEFAULT_BIT_SIZE) {
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if (!globalThis.crypto.subtle || !TextEncoder) {
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throw new Error("Password-based backup is not available on this platform");
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}
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const key = await globalThis.crypto.subtle.importKey("raw", new TextEncoder().encode(passphrase), {
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name: "PBKDF2"
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}, false, ["deriveBits"]);
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const keybits = await globalThis.crypto.subtle.deriveBits({
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name: "PBKDF2",
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salt: new TextEncoder().encode(salt),
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iterations: iterations,
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hash: "SHA-512"
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}, key, numBits);
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return new Uint8Array(keybits);
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}
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//# sourceMappingURL=key-passphrase.js.map
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