import type { CryptoContext } from './c-crypto.js';
export declare const hkdf: (input: {
    digest: "sha1" | "sha256" | "sha384" | "sha512";
    ikm: Uint8Array;
    salt: Uint8Array;
    info: Uint8Array;
    keylen: number;
}, _ctx?: CryptoContext) => Promise<Uint8Array>;
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