util-ref-edited-double-sha256

// https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/digest#converting_a_digest_to_a_hex_string
// The function from MDN has been modified to provide a double sha256

/*
    Open a new browser tab or window and paste the following in your developer console (CTRL + SHIFT + I)

    (You may need to type "allow pasting", as indicated by your browser)
*/

const text =
  "An obscure body in the S-K System, your majesty. The inhabitants refer to it as the planet Earth.";

async function provideSha256ByteArray(message) {
  const msgUint8 = new TextEncoder().encode(message);
  const hashBuffer = await crypto.subtle.digest("SHA-256", msgUint8);
  return new Uint8Array(hashBuffer);

}

async function provideDoubleSha256(message){
    const sha256ByteArray = await provideSha256ByteArray(message);
    const hashBuffer = await crypto.subtle.digest("SHA-256", sha256ByteArray);
    const hashBufferByteArray = new Uint8Array(hashBuffer);
    const hashArray = Array.from(hashBufferByteArray);

    const hashHex = hashArray
    .map((b) => b.toString(16).padStart(2, "0"))
    .join("");

    return hashHex;
}

/*
    Get the double sha256 hash for any string, in this case the string assigned to the text variable
*/

const result = await provideDoubleSha256(text);

/*
    The result is "255c3a66cd15953821c8c3a04dc22d10a826209a705d13f8072f674c2bf3294c"

    Repeat this with any other string
*/