Jump to content
Tuts 4 You

[HIRING] Somebody to Reverse Engineering an Android App


applejack

Recommended Posts

Sorry If this is off-topic, but I'm currently in search of somebody who can assist me in reverse engineering an Android APK.

The primary goal is to rewrite an AES encryption function. It involves reverse engineering an APK (original app and decompiled code would be provided).

These are the headers that I need a script to generate them locally:

X-Book-Security-Token: 4d6a55774e5463304d7a45344e6a6730

X-Book-Identifier-Type: MZyGb/ylkFYYpEqgx5HAIw== 

X-Book-User-Identifier: EMBEQb01fnjUF9QzhSHU1TfdYXguyD2YPY8wmDlpZRo=

The headers are somehow associated with each other, I suspect it has an ID or something appended to it during generation.

I suspect the functions below handle the encryption process:

public final String mo178266b(String str, String str2, String str3, String str4) {
    C75446pfv.m13004a((Object) str, "");
    C75446pfv.m13004a((Object) str2, "");
    C75446pfv.m13004a((Object) str3, "");
    C75446pfv.m13004a((Object) str4, "");
    try {
        SecretKeyFactory instance = SecretKeyFactory.getInstance(str4);
        char[] charArray = str3.toCharArray();
        C75446pfv.m13022e((Object) charArray, "");
        byte[] bytes = m187477d(m187475b(str2)).getBytes(pxn.f11244g);
        C75446pfv.m13022e((Object) bytes, "");
        SecretKeySpec secretKeySpec = new SecretKeySpec(instance.generateSecret(new PBEKeySpec(charArray, bytes, 4096, 128)).getEncoded(), "AES");
        byte[] decode = Base64.decode(str, 2);
        Cipher instance2 = Cipher.getInstance("AES/CBC/PKCS5Padding");
        instance2.init(2, secretKeySpec, m187476c(m187475b(str2)));
        byte[] doFinal = instance2.doFinal(decode);
        C75446pfv.m13022e((Object) doFinal, "");
        return new String(doFinal, pxn.f11244g);
    } catch (Exception e) {
        e.printStackTrace();
        return "";
    }
}

/* renamed from: a */
public final String mo178264a(byte[] bArr) {
    C75446pfv.m13004a((Object) bArr, "");
    StringBuilder sb = new StringBuilder();
    for (byte b : bArr) {
        String hexString = Integer.toHexString(b & UnsignedBytes.MAX_VALUE);
        C75446pfv.m13022e((Object) hexString, "");
        if (hexString.length() == 1) {
            sb.append('0');
        }
        sb.append(hexString);
    }
    String sb2 = sb.toString();
    C75446pfv.m13022e((Object) sb2, "");
    return sb2;
}
public final char[] mo178270d(String str, String str2, String str3, String str4) {
    C75446pfv.m13004a((Object) str, "");
    C75446pfv.m13004a((Object) str2, "");
    C75446pfv.m13004a((Object) str3, "");
    C75446pfv.m13004a((Object) str4, "");
    try {
        String c = mo178268c(str, str4, str2, str3);
        byte[] bytes = (str4 + "|" + c).getBytes(pxn.f11244g);
        C75446pfv.m13022e((Object) bytes, "");
        String encodeToString = Base64.encodeToString(bytes, 2);
        C75446pfv.m13022e((Object) encodeToString, "");
        char[] charArray = encodeToString.toCharArray();
        C75446pfv.m13022e((Object) charArray, "");
        return charArray;
    } catch (Exception e) {
        e.printStackTrace();
        char[] charArray2 = "".toCharArray();
        C75446pfv.m13022e((Object) charArray2, "");
        return charArray2;
    }
}

The payment for this project is negotiable and will be determined based on the complexity of the task.

If you have the expertise and are interested in working on this project, please feel free to reach out by commenting here or sending me a private message.

Edited by applejack
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...