Wachtwoordgenerator en -validator

function randomPassword(length = 16, sets = {lower:true, upper:true, digits:true, symbols:true}) {
  const pools = {
    lower: 'abcdefghijklmnopqrstuvwxyz',
    upper: 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
    digits: '0123456789',
    symbols: '!@#$%^&*+-=_~`|/?()[]{}<>,.;:\'\"'
  };
  let pool = '';
  for (const k of Object.keys(sets)) if (sets[k]) pool += pools[k];
  if (!pool) throw new Error('No charset');
  // Rejection sampling removes modulo bias
  const limit = Math.floor(0x100000000 / pool.length) * pool.length;
  const buf = new Uint32Array(1);
  let out = '';
  for (let i = 0; i < length; i++) {
    do { crypto.getRandomValues(buf); } while (buf[0] >= limit);
    out += pool[buf[0] % pool.length];
  }
  return out;
}

import secrets

def random_password(length=16, lower=True, upper=True, digits=True, symbols=True):
    pools = {
        'lower': 'abcdefghijklmnopqrstuvwxyz',
        'upper': 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
        'digits': '0123456789',
        'symbols': '!@#$%^&*+-=_~`|/?()[]{}<>,.;:\'\"'
    }
    pool = ''.join(v for k, v in pools.items() if locals()[k])
    if not pool:
        raise ValueError('No charset')
    return ''.join(secrets.choice(pool) for _ in range(length))

function random_password($length = 16, $sets = ['lower'=>true,'upper'=>true,'digits'=>true,'symbols'=>true]) {
    $pools = [
        'lower' => 'abcdefghijklmnopqrstuvwxyz',
        'upper' => 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
        'digits' => '0123456789',
        'symbols' => '!@#$%^&*+-=_~`|/?()[]{}<>,.;:\'\"'
    ];
    $pool = '';
    foreach ($sets as $k => $on) if ($on) $pool .= $pools[$k];
    if ($pool === '') throw new Exception('No charset');
    $out = '';
    for ($i = 0; $i < $length; $i++) {
        $out .= $pool[random_int(0, strlen($pool)-1)];
    }
    return $out;
}

package main

import (
  "crypto/rand"
  "math/big"
)

func RandomPassword(length int, pool string) (string, error) {
  out := make([]byte, length)
  for i := 0; i < length; i++ {
    nBig, err := rand.Int(rand.Reader, big.NewInt(int64(len(pool))))
    if err != nil { return "", err }
    out[i] = pool[nBig.Int64()]
  }
  return string(out), nil
}

import java.security.SecureRandom;

public class Pw {
  static final String POOL = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*+-=_~`|/?()[]{}<>,.;:'\"";
  static final SecureRandom SR = new SecureRandom();
  static String randomPassword(int length) {
    StringBuilder sb = new StringBuilder(length);
    for (int i = 0; i < length; i++) {
      int idx = SR.nextInt(POOL.length());
      sb.append(POOL.charAt(idx));
    }
    return sb.toString();
  }
}

using System;
using System.Security.Cryptography;

public static class Pw {
  public static string RandomPassword(int length, string pool) {
    // GetInt32 draws an unbiased value in [0, pool.Length)
    var chars = new char[length];
    for (int i = 0; i < length; i++) {
      chars[i] = pool[RandomNumberGenerator.GetInt32(pool.Length)];
    }
    return new string(chars);
  }
}

use rand::rngs::OsRng;
use rand::Rng;

fn random_password(length: usize, pool: &str) -> String {
    // gen_range is uniform, so there is no modulo bias
    let chars: Vec = pool.chars().collect();
    (0..length)
        .map(|_| chars[OsRng.gen_range(0..chars.len())])
        .collect()
}

fn main() {
    let pool = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*+-=_~`|/?()[]{}<>,.;:'\"";
    let pw = random_password(16, pool);
    println!("{}", pw);
}