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    Variable hkdfConst

    hkdf: (
        hash: TArg<CHash>,
        ikm: TArg<Uint8Array>,
        salt: TArg<Uint8Array | undefined>,
        info: TArg<Uint8Array | undefined>,
        length: number,
    ) => TRet<Uint8Array>

    HKDF (RFC 5869): derive keys from an initial input. Combines hkdf_extract + hkdf_expand in one step

    Type Declaration

      • (
            hash: TArg<CHash>,
            ikm: TArg<Uint8Array>,
            salt: TArg<Uint8Array | undefined>,
            info: TArg<Uint8Array | undefined>,
            length: number,
        ): TRet<Uint8Array>

      • Parameters

        • hash: TArg<CHash>

          hash function that would be used (e.g. sha256)

        • ikm: TArg<Uint8Array>

          input keying material, the initial key

        • salt: TArg<Uint8Array | undefined>

          optional salt value (a non-secret random value)

        • info: TArg<Uint8Array | undefined>

          optional context and application specific information bytes

        • length: number

          length of output keying material in bytes. RFC 5869 §2.3 allows 0..255*HashLen, so 0 returns an empty OKM.

        Returns TRet<Uint8Array>

        Output keying material derived from the input key.

    If the requested output length exceeds the HKDF limit for the selected hash. Error

    HKDF (RFC 5869): derive keys from an initial input.

    import { hkdf } from '@noble/hashes/hkdf.js';
    import { sha256 } from '@noble/hashes/sha2.js';
    import { randomBytes, utf8ToBytes } from '@noble/hashes/utils.js';
    const inputKey = randomBytes(32);
    const salt = randomBytes(32);
    const info = utf8ToBytes('application-key');
    const okm = hkdf(sha256, inputKey, salt, info, 32);

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