onst crypto = require('crypto');
function l(param) {
  console.log(param);
}
const md5 = crypto.createHash('md5');//創(chuàng)建一個md5 hash算法
md5.update('aa');//添加要轉(zhuǎn)化的值
md5.update('cc');//與前面的要轉(zhuǎn)化的值進(jìn)行拼接
l(md5.digest('hex'));//打印16進(jìn)制的密文，
const sha1 = crypto.createHash('sha1');//創(chuàng)建一個sh1 hash算法
sha1.update('bbbb');
l(sha1.digest('hex'));
const hmac = crypto.createHmac('md5', 'key');//創(chuàng)建一個帶秘鑰的sha1或者md5算法
hmac.update('aacc');
l(hmac.digest('hex'));

//AES 對稱加密算法的一種。
//創(chuàng)建加密算法
function aesEncode(data, key) {
  const cipher = crypto.createCipher('aes192', key);
  var crypted = cipher.update(data, 'utf8', 'hex');
  crypted += cipher.final('hex');
  return crypted;
}
//創(chuàng)建解密算法
function aesDecode(encrypted, key) {
  const decipher = crypto.createDecipher('aes192', key);
  var decrypted = decipher.update(encrypted, 'hex', 'utf8');
  decrypted += decipher.final('utf8');
  return decrypted;
}
var data = '我是一個大傻瓜';
var key = 'keykey';
l(aesEncode(data, key));
l(data);
l(aesDecode(aesEncode(data, key), key));

//DH算法協(xié)商秘鑰
/**
 * 主動方使用的協(xié)商方法
 * @returns array():say是要傳達(dá)給被動方的三個數(shù)據(jù) one是自己要用的一個數(shù)據(jù)
 */
function dhOneSay() {
  var one = crypto.createDiffieHellman(512);
  var one_key = one.generateKeys();
  var prime = one.getPrime();
  var generator = one.getGenerator();
  var say = {
    prime: prime, generator: generator, one_key: one_key
  };

  return [say, one];
}
/**
 * 被動方使用的協(xié)商方法已經(jīng)可以得到秘鑰
 * @param {prime: prime, generator: generoter, one_key: one_key} props 
 * @returns array() two_key是要返回給主動方的秘數(shù)，theSecret是計算出來的秘鑰
 */
function dhTwoGetSay(props) {
  var two = crypto.createDiffieHellman(props.prime, props.generator);
  var two_key = two.generateKeys();
  var theSecret = (two.computeSecret(props.one_key)).toString('hex');
  return [ two_key, theSecret ];
}
/**
 * 主動方收到被動方給予的秘鑰后
 * @param str two_key 被動方返回的密數(shù)
 * @param str one 主動方最初的隨機(jī)數(shù)
 * @returns str 計算出來的秘鑰
 */
function dhOneGet(two_key,one){
return (one.computeSecret(two_key)).toString('hex');
}
//主動方自己產(chǎn)生數(shù)據(jù)
var oneSay=dhOneSay();
//被動方接受主動方傳過來的數(shù)據(jù)進(jìn)行計算，產(chǎn)生握手?jǐn)?shù)據(jù)和最終的秘鑰
var twoGetSay=dhTwoGetSay(oneSay[0]);
//主動方接收到被動方傳來的數(shù)據(jù)進(jìn)行計算得到最終秘鑰
var oneSecret=dhOneGet(twoGetSay[0],oneSay[1]);
//被動方的秘鑰早已產(chǎn)生了直接讀取
var twoSecret=twoGetSay[1];
l(oneSay);
l(twoGetSay);
l(oneSecret);
l(twoSecret);