All files passwordcheck.js

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const BREAKPOINTS = [ 78.0, 52, 0 ];
const PWSTRENGTH_LABELS = [ 'weak', 'acceptable', 'strong' ];
 
function passwordcheck (pw) {
  const pwEntropy = blindEntropy(pw);
  const strength = entropyMeter(pwEntropy);
  return {
    strength,
    label: PWSTRENGTH_LABELS[strength]
  };
}
 
const blindEntropy = (pw) => {
  const numberPermutations = /.*[0-9].*/.test(pw) ? 10 : 0;
  const lowercasePermutations = /.*[a-z].*/.test(pw) ? 26 : 0;
  const uppercasePermutations = /.*[A-Z].*/.test(pw) ? 26 : 0;
  const punctuationPermutations = /.*[^a-zA-Z0-9].*/.test(pw) ? 33 : 0;
 
  const permutations = numberPermutations + lowercasePermutations + uppercasePermutations + punctuationPermutations;
  const pwLength = pw.length;
  return Math.log2(permutations ** pwLength);
};
 
const entropyMeter = (pwEntropy) => {
  const ndx = BREAKPOINTS.findIndex(e => pwEntropy >= e);
  // 0 = Too Weak; 1 == Acceptable; 2 = Strong
  const strength = BREAKPOINTS.length - 1 - ndx;
  return strength;
};
 
export default passwordcheck;