Browser implementation of sha512

sha512.js

function hex(buffer) {
  var hexCodes = [];
  var view = new DataView(buffer);
  for (var i = 0; i < view.byteLength; i += 4) {
    // Using getUint32 reduces the number of iterations needed (we process 4 bytes each time)
    var value = view.getUint32(i)
    // toString(16) will give the hex representation of the number without padding
    var stringValue = value.toString(16)
    // We use concatenation and slice for padding
    var padding = '00000000'
    var paddedValue = (padding + stringValue).slice(-padding.length)
    hexCodes.push(paddedValue);
  }

  // Join all the hex strings into one
  return hexCodes.join("");
}

function sha512(str) {
  // We transform the string into an arraybuffer.
  var buffer = new TextEncoder("utf-8").encode(str);
  return crypto.subtle.digest("SHA-512", buffer).then(function (hash) {
    return hex(hash);
  });
}
sha512("secret").then(function(digest) {
  console.log(digest);
});

crypto is a native node module iirc. I'll give it another check, but i don't think this is browser-compatible

well, i guess i was wrong 🤣 sorry about that

also i might write a decoder function, if you don't mind, and will send a link to that gist when done