https://developers.weixin.qq.com/miniprogram/dev/api/share/wx.authPrivateMessage.html
wx.authPrivateMessage返回的数据无法解密,
const appId = 'wxd7264f7b1ec9e679'
const sessionKey = 'FnbzFuykaWwt9Av342H7+Q=='
"data": {
"encryptedData": "YMH6/wjpMA33LR4zxj2vKVGDZgaa67/oQ2IH9MPPEol76zk6+zcX1DLzBFQv/XxpWKimi9x5nabgPUOCQtY3L0323/wNh59DTlu4o/tdH69+ZbABHKTo7EoYHo9rOKCx",
"errMsg": "authPrivateMessage:ok",
"iv": "iVD+cruQQH6PrFLPX07eBA==",
"valid": true
},
wx.getShareInfo 返回的数据可以正常解密,但是没有 activityId
const appId = 'wxd7264f7b1ec9e679'
const sessionKey = 'FnbzFuykaWwt9Av342H7+Q=='
"data": {
"cloudID": "53_w7U7Pinrvm8FsKvxWSURr9xFM8NYTy7EZW_JK06tQlcYb1At-3cD5hvDMkA",
"encryptedData": "7ZgEsmDJjz/gADd/apDjjGA1Ci3uzbI0jDlPVjJEIGLDBNgUq+woin5VUWQFHPkNMDcs2uoDwATL+1eB+XED2O0kl/trlOn6+nK7sqAEtI5u1/i4gXyhm7r0zxYLn1AGwSpvyGVuzaFJzx1yxfAPHCXdEwPyuvPL1CAk9SBv9Fp9Cb3hI2zBCBMyX1Z4y+nj/78NaI+Zxn9eQmbJJL7yMEeoIBOyv/Fm/dGGIU7naXrIgrzUVh9M6UQilQHyP4RI",
"errMsg": "getShareInfo:ok",
"iv": "r0KC/5PD+fRuU/wd5cLhbQ=="
},

官方示例代码有问题,因为demo是userinfo的解密,需要解析为json。但私密消息的解密结果直接是activity_id,所以私密消息是不能json_decode的,否则会显示IllegalBuffer