关于微信小程序的加密数据解密算法怎么写成c#版本

[caicaihui]

var crypto = require('crypto')

function WXBizDataCrypt(appId, sessionKey) {
  this.appId = appId
  this.sessionKey = sessionKey
}

WXBizDataCrypt.prototype.decryptData = function (encryptedData, iv) {
  // base64 decode
  var sessionKey = new Buffer(this.sessionKey, 'base64')
  encryptedData = new Buffer(encryptedData, 'base64')
  iv = new Buffer(iv, 'base64')

  try {
     // 解密
    var decipher = crypto.createDecipheriv('aes-128-cbc', sessionKey, iv)
    // 设置自动 padding 为 true，删除填充补位
    decipher.setAutoPadding(true)
    var decoded = decipher.update(encryptedData, 'binary', 'utf8')
    decoded += decipher.final('utf8')
    
    decoded = JSON.parse(decoded)

  } catch (err) {
    throw new Error('Illegal Buffer')
  }

  if (decoded.watermark.appid !== this.appId) {
    throw new Error('Illegal Buffer')
  }

  return decoded
}

module.exports = WXBizDataCrypt

var WXBizDataCrypt = require('./WXBizDataCrypt')

var appId = 'wx4f4bc4dec97d474b'
var sessionKey = 'tiihtNczf5v6AKRyjwEUhQ=='
var encryptedData = 
	'CiyLU1Aw2KjvrjMdj8YKliAjtP4gsMZM'+
	'QmRzooG2xrDcvSnxIMXFufNstNGTyaGS'+
	'9uT5geRa0W4oTOb1WT7fJlAC+oNPdbB+'+
	'3hVbJSRgv+4lGOETKUQz6OYStslQ142d'+
	'NCuabNPGBzlooOmB231qMM85d2/fV6Ch'+
	'evvXvQP8Hkue1poOFtnEtpyxVLW1zAo6'+
	'/1Xx1COxFvrc2d7UL/lmHInNlxuacJXw'+
	'u0fjpXfz/YqYzBIBzD6WUfTIF9GRHpOn'+
	'/Hz7saL8xz+W//FRAUid1OksQaQx4CMs'+
	'8LOddcQhULW4ucetDf96JcR3g0gfRK4P'+
	'C7E/r7Z6xNrXd2UIeorGj5Ef7b1pJAYB'+
	'6Y5anaHqZ9J6nKEBvB4DnNLIVWSgARns'+
	'/8wR2SiRS7MNACwTyrGvt9ts8p12PKFd'+
	'lqYTopNHR1Vf7XjfhQlVsAJdNiKdYmYV'+
	'oKlaRv85IfVunYzO0IKXsyl7JCUjCpoG'+
	'20f0a04COwfneQAGGwd5oa+T8yO5hzuy'+
	'Db/XcxxmK01EpqOyuxINew=='
var iv = 'r7BXXKkLb8qrSNn05n0qiA=='

var pc = new WXBizDataCrypt(appId, sessionKey)

var data = pc.decryptData(encryptedData , iv)

console.log('解密后 data: ', data)
// 解密后的数据为
//
// data = {
//   "nickName": "Band",
//   "gender": 1,
//   "language": "zh_CN",
//   "city": "Guangzhou",
//   "province": "Guangdong",
//   "country": "CN",
//   "avatarUrl": "http://wx.qlogo.cn/mmopen/vi_32/aSKcBBPpibyKNicHNTMM0qJVh8Kjgiak2AHWr8MHM4WgMEm7GFhsf8OYrySdbvAMvTsw3mo8ibKicsnfN5pRjl1p8HQ/0",
//   "unionId": "ocMvos6NjeKLIBqg5Mr9QjxrP1FA",
//   "watermark": {
//     "timestamp": 1477314187,
//     "appid": "wx4f4bc4dec97d474b"
//   }
// }

上面是Node版本，能帮忙转成c#版本吗

[娃都会打酱油了]

aes-128-cbc这都写出算法了 AES算法，用的CBC模式，就是要试下padding是什么值，看描述可以试试Zero

[娃都会打酱油了]

Encoding是utf-8，都是base64编码

[娃都会打酱油了]

            var key = Convert.FromBase64String("tiihtNczf5v6AKRyjwEUhQ==");
            var iv = Convert.FromBase64String("r7BXXKkLb8qrSNn05n0qiA==");
            var encryptedData =
    "CiyLU1Aw2KjvrjMdj8YKliAjtP4gsMZM" +
    "QmRzooG2xrDcvSnxIMXFufNstNGTyaGS" +
    "9uT5geRa0W4oTOb1WT7fJlAC+oNPdbB+" +
    "3hVbJSRgv+4lGOETKUQz6OYStslQ142d" +
    "NCuabNPGBzlooOmB231qMM85d2/fV6Ch" +
    "evvXvQP8Hkue1poOFtnEtpyxVLW1zAo6" +
    "/1Xx1COxFvrc2d7UL/lmHInNlxuacJXw" +
    "u0fjpXfz/YqYzBIBzD6WUfTIF9GRHpOn" +
    "/Hz7saL8xz+W//FRAUid1OksQaQx4CMs" +
    "8LOddcQhULW4ucetDf96JcR3g0gfRK4P" +
    "C7E/r7Z6xNrXd2UIeorGj5Ef7b1pJAYB" +
    "6Y5anaHqZ9J6nKEBvB4DnNLIVWSgARns" +
    "/8wR2SiRS7MNACwTyrGvt9ts8p12PKFd" +
    "lqYTopNHR1Vf7XjfhQlVsAJdNiKdYmYV" +
    "oKlaRv85IfVunYzO0IKXsyl7JCUjCpoG" +
    "20f0a04COwfneQAGGwd5oa+T8yO5hzuy" +
    "Db/XcxxmK01EpqOyuxINew==";
            var str = AESHelper.DecryptWithCBC(encryptedData, key, iv);

AESHelper就是默认的PCKS7……