ts-mls/dist/crypto/kdf.js

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import { encodeVarLenData } from "../codec/variableLength.js";
import { encodeUint16, encodeUint32 } from "../codec/number.js";
export function expandWithLabel(secret, label, context, length, kdf) {
    return kdf.expand(secret, new Uint8Array([
        ...encodeUint16(length),
        ...encodeVarLenData(new TextEncoder().encode(`MLS 1.0 ${label}`)),
        ...encodeVarLenData(context),
    ]), length);
}
export async function deriveSecret(secret, label, kdf) {
    return expandWithLabel(secret, label, new Uint8Array(), kdf.size, kdf);
}
export async function deriveTreeSecret(secret, label, generation, length, kdf) {
    return expandWithLabel(secret, label, encodeUint32(generation), length, kdf);
}
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