HoW To Completely Disable Signature check In Touchwiz Devices
You will need the following:
1. Core.jar from system/framework folder
2. services.jar from system/framework folder
3. Apktool/baksmali+smali
Part 1: Allows installing apps with broken/mismatched signatures
Modding Core.Jar
1. Decompile core.jar and navigate to java/security
2. Open MessageDigest.smali
3. find the following method
.method public static isEqual([B[B)Z
At the beginning you will find code like this:
const/4 v1, 0x0
array-length v2, p0
Change the 0x0 to 0x1 so that it becomes:-
const/4 v1, 0x1
array-length v2, p0
4. Now save and close MessageDigest.smali
5. In the same directory, open Signature.smali
6. Find the method:
.method public final verify([B)Z
7. Find this code at the very end of the method:
invoke-virtual {p0, p1}, Ljava/security/SignatureSpi;->engineVerify([B)Z
move-result v0
return v0
Change the move-result v0 to const/4 v0, 0x1 so that it becomes like this:
invoke-virtual {p0, p1}, Ljava/security/SignatureSpi;->engineVerify([B)Z
const/4 v0, 0x1
return v0
8. Now find this method:
.method public final verify([BII)Z
9. Scroll to the end of the method and find this code:
invoke-virtual {p0, p1, p2, p3}, Ljava/security/SignatureSpi;->engineVerify([BII)Z
move-result v0
return v0
And replace it with this Code:
invoke-virtual {p0, p1, p2, p3}, Ljava/security/SignatureSpi;->engineVerify([BII)Z
const/4 v0, 0x1
return v0
10. Now save and close Signature.smali. Recompile core.jar
Part 2 need Services.jar
1. Decompile services.jar and navigate to com\android\server\pm
2. Open PackageManagerService$InstallParams.smali and find the following
method:
.method private installLocationPolicy(Landroid/content/pm/PackageInfoLite;I)I
3. Scroll down until you find code that looks like the following Code:
if-nez v7, :cond_1
iget v7, p1, Landroid/content/pm/PackageInfoLite;->versionCode:I
iget v8, v3, Landroid/content/pm/PackageParser$Package;->mVersionCode:I
if-ge v7, v8, :cond_1 [U have to.modify this line)
const-string v4, "PackageManager" new-instance v5, Ljava/lang/StringBuilder;
invoke-direct {v5}, Ljava/lang/
StringBuilder;->()V
const-string v7, "Can\'t install update of "
(okay i already highlighted the code if-ge v7, v8, :cond_1 u have to change it so it will look like this:
if-ge v8, v8, :cond_1
4. Okay Done now save the smali
recompile services.jar
5. Now - Push core.jar & services.jar to your system/framework/here before pushing make sure you already copied the original backup to you sdcard.
6. Now reboot and enjoy
Note: Please Don't Mirror the link or guide.
Tested in JB 4.1.2
