hkdf: info must be passed to extract

Changing the signature of HKDF functions. Specifically passing info to expand, thus, the hkdf key can be reused across multiple calls to expand.

class HKDF {
    constructor(hash: new () => Hash, key: Uint8Array, salt?: Uint8Array);
    expand(length: number, info?: Uint8Array):
}

Thank you, this makes sense. I'll look into it.

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