Android的軟體都是Java語言編譯成Dalvik VM的bytecode然後交由虛擬機器來執行。每支程式都會有各自的VM環境互不影響。
也可以呼叫binary .so 。
不過中華電信Hami App 的認證機制是做在Java裡面, 所以破解起來非常容易, 因為bytecode很容易disassemble。
- 機器應該要先root, 才能把安裝在系統上的apk讀出來。
- 解開apk,裡面有一些resource檔, manifest, 跟classes.dex 主程式。
- classes.dex是所有class包裝在一起, 有點像是jar檔。可以用 baksmali 解開還原成assembly code, 修改完之後用smali包裝回去.dex
- net/emome/hamiapps/sdk/utility/LicenseUtility.smali 裡面有一個method checkValidLicense, 會連線檢查你的IMEI, 軟體授權等等, 只要有一項不通過的話, 就會丟出一個exception。要讓他通過的話, 想辦法讓這個method不會送出任何exception就好了。
- 之後就用smali打包成classes.dex。
- 丟回去原本的apk, 這邊不能直接用zip壓縮, 因為需要修改manifest裡面的簽章跟每個檔案的hash, 直接壓縮可以安裝, 但是是不能執行的。
- 就按照這裡的教學, 隨便生出一個key pair, 然後用signapk 去簽章就可以了。
軟體既然都要線上認證了, 就不要單純的只用signature有沒有通過來認證, 這樣太好破解了。
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