nodejs加密Crypto的实例代码

var crypto=require('crypto');
var $=require('underscore');var DEFAULTS = {
  encoding: {
    input: 'utf8',
    output: 'hex'
  },
  algorithms: ['bf', 'blowfish', 'aes-128-cbc']
};

function MixCrypto(options) {
  if (typeof options == 'string')
    options = { key: options };

  options = $.extend({}, DEFAULTS, options);
  this.key = options.key;
  this.inputEncoding = options.encoding.input;
  this.outputEncoding = options.encoding.output;
  this.algorithms = options.algorithms;
}

MixCrypto.prototype.encrypt = function (plaintext) {
  return $.reduce(this.algorithms, function (memo, a) {
    var cipher = crypto.createCipher(a, this.key);
    return cipher.update(memo, this.inputEncoding, this.outputEncoding)
      + cipher.final(this.outputEncoding)
  }, plaintext, this);
};

MixCrypto.prototype.decrypt = function (crypted) {
  try {
    return $.reduceRight(this.algorithms, function (memo, a) {
      var decipher = crypto.createDecipher(a, this.key);
      return decipher.update(memo, this.outputEncoding, this.inputEncoding)
        + decipher.final(this.inputEncoding);
    }, crypted, this);
  } catch (e) {
    return;
  }
};