一.初始
今天无聊研究京东回家发现数据加密 
二.开始研究
经过初步研究和使用java还原发现djencrypt 是用了AES/CBC/PKCS5Padding算法加密，使用java解密试一试
解密前(部分内容因隐私数据而简化): IJpu5U8gjaurTVnrDv9 UWRjNc kmtrUCUjEIkxiEJ4nd0ifKufXOwqJqHNB 721YtnVHx4SMN2krqTdf2fTbVCEDzd0D2XZS50quzP7a2ZgpP5sqXKEFAhxTmOQ6m8aqhNgyA6rPaOlqhwIPsl9fiCfdvBxP44lTTEZ0TLW YB9vZBa5owKAStfg4NpztPhUqWkfuw2qL jO5beissFM9P6u7Hk00d42bDnAM81ZOj93U59ZNJyMPtZh8HLFlW6KvinYyzcf 10oVxOid1UfNHtDEt87bNNPxfZZaVzDMsC4ECj6vY5GS/zhWr7a2ASL5iggBJx99KFl3tBJAL1QUr7Fnlj0M9sh7EWENoUNLoznYvagDHaODy kZl7tJTM2VqSZFVKQh1Ykf8 Rd1Ec70rD8o5qFy/JrWS7S5lYnTdP6VUx Si2o2BGRqmUZavY/N4I5K12UBUQEr/VVjJ1FMjKEiso3K R6s1qpipO1KBPK/tU2jHFkD1H/Ix1XDEP1GPnWDH1VXpM/go0Dyk11O709KqG6EI7MSYVmigzFSJ/7rwMMsrDlxNpUWEJUP/fIwwtZP2qy48YaEImqtrjJY8ffp Fjm2cn5s2l6e/OhLyacXKG 51HGE4AhhQyRknD/wuD/HZaN0x5CJ9k6Zo4iSS77u5j/WninTdPNzaqYLnEbF86n5XaiQpAWGScm/nyMvaQ6Lv8p3XK 9pbbKNNTMUboMojPh5xv= 解密后(部分内容因隐私数据而简化): {
"platCode":"H5","appName":"paidaojia","channel":"","appVersion":"8.20.0","body":"{\"pageSource\":\"home\",\"ctp\":\"home\",\"refPar\":\"\"}","lng":114,"lat":26,"city_id":1699,"poi":"","jda":"209449046.16526660288431563835861.1652666028.1654775671.1654876047.37","traceId":"H5_DEV_88EBE0AB-964D-4C27-A418-81DC676723D61654912336424","globalPlat":"2","deviceId":"H5_DEV_44EBE0AB-964D-4C27-A418-81DC676723D6"
,
"signNeedBody"
:
1
,
"_jdrandom"
:
1654912336424
,
"signKeyV1"
:
"88cf26b6244e862c879e45271053572ba603e257a0a6d2bae54a874e35493b33"
}
发现有个加密参数signKeyV1 继续研究,signKeyV1长度64位,估计是固定长度的，通过分析发现是SHA256算法
"signKeyV1": "88cf26b6244e862c879e45271053572ba603e257a0a6d2bae54a874e35493b33"
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