微信小程序获取用户信息js包，WXBizDataCrypt.js下载

//WXBizDataCrypt.js 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