owencm

const blobToImage = (blob) => {
  return new Promise(resolve => {
    const url = URL.createObjectURL(blob)
    let img = new Image()
    img.onload = () => {
      URL.revokeObjectURL(url)
      resolve(img)
    }
    img.src = url
  })

GaspardP

// Computes the SHA-256 digest of a string with Web Crypto
// Source: https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/digest

function sha256(str) {
  // Get the string as arraybuffer.
  var buffer = new TextEncoder("utf-8").encode(str)
  return crypto.subtle.digest("SHA-256", buffer).then(function(hash) {
    return hex(hash)
  })
}