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/*
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 *  This file is part of CoCalc: Copyright © 2020 Sagemath, Inc.
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 *  License: MS-RSL – see LICENSE.md for details
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 */
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// Adapted from https://github.com/bahamas10/node-ssh-fingerprint
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import md5 from "md5";
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// add colons, 'hello' => 'he:ll:o'
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const colons = (s: string) => s.replace(/(.{2})(?=.)/g, "$1:");
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export function compute_fingerprint(pub: string | undefined): string {
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  if (pub == null) {
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    throw new Error("No valid SSH key value");
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  }
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  const pubbuffer = Buffer.from(pub, "base64");
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  const key = md5(
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    new Uint8Array(
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      pubbuffer.buffer,
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      pubbuffer.byteOffset,
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      pubbuffer.byteLength,
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    ),
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  );
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  return colons(key);
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}
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