我也同样遇到这个问题，用“微信开发者工具”  模拟运行的小程序没有问题，但是 用手机扫一扫进入之后， 后台就出现解密手机号码失败：

Error: Error: error:06065064:digital envelope routines:EVP_DecryptFinal_ex:bad decrypt

    at WXBizDataCrypt.decryptData (/opt/dida-server/src/api/service/WXBizDataCrypt.js:24:11)

    at Generator.next (<anonymous>)

    at step (/opt/dida-server/app/api/controller/descro.js:1:191)

    at /opt/dida-server/app/api/controller/descro.js:1:437

    at Promise._execute (/opt/dida-server/node_modules/thinkjs/node_modules/bluebird/js/release/debuggability.js:272:9)

    at Promise._resolveFromExecutor (/opt/dida-server/node_modules/thinkjs/node_modules/bluebird/js/release/promise.js:473:18)

    at new Promise (/opt/dida-server/node_modules/thinkjs/node_modules/bluebird/js/release/promise.js:77:14)