shared hmac.ts

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42 1x
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1x
 
 
 
 
 
 
 
 
 
  import { createHmac, timingSafeEqual } from "crypto";
 
// For compatibility with NodeJS v10 typings
type BinaryAlike = string | NodeJS.ArrayBufferView;
 
/**
 *
 *
 * @param {BinaryAlike} data
 * @return {NodeJS.ArrayBufferView}  {NodeJS.ArrayBufferView}
 */
function parseBinaryAlike(data: BinaryAlike): NodeJS.ArrayBufferView {
  Iif (typeof data === "string") return Buffer.from(data, "hex");
  /* istanbul ignore next */
  return data;
}
 
export type HmacOptions = {
  algorithm?: string;
  key: BinaryAlike;
  data: BinaryAlike;
  digest: BinaryAlike;
};
 
/**
 *
 *
 * @export
 * @param {HmacOptions} options
 * @return {boolean}
 */
export function compareHmac({
  algorithm = "sha256",
  data,
  digest,
  key
}: HmacOptions) {
  const hash = createHmac(algorithm, key).update(data).digest();
 
  return timingSafeEqual(hash, parseBinaryAlike(digest));
}