IssueTracker

The issue is that Jetifier modifies jars and does not remove signatures. Below is the original class:

Classfile /tmp/non-jetified/org/bouncycastle/jce/provider/ExtCRLException.class
  Last modified Mar 1, 2015; size 362 bytes
  MD5 checksum 3968a716f9e60e1ad36c34157bd0239f
class org.bouncycastle.jce.provider.ExtCRLException extends java.security.cert.CRLException
  minor version: 0
  major version: 49
  flags: ACC_SUPER
Constant pool:
   #1 = Utf8               <init>
   #2 = Utf8               cause
   #3 = Utf8               getCause
   #4 = Utf8               java/security/cert/CRLException
   #5 = Utf8               org/bouncycastle/jce/provider/ExtCRLException
   #6 = Class              #4             // java/security/cert/CRLException
   #7 = Class              #5             // org/bouncycastle/jce/provider/ExtCRLException
   #8 = Utf8               Ljava/lang/Throwable;
   #9 = Utf8               (Ljava/lang/String;)V
  #10 = Utf8               ()Ljava/lang/Throwable;
  #11 = Utf8               (Ljava/lang/String;Ljava/lang/Throwable;)V
  #12 = NameAndType        #2:#8          // cause:Ljava/lang/Throwable;
  #13 = NameAndType        #1:#9          // "<init>":(Ljava/lang/String;)V
  #14 = Fieldref           #7.#12         // org/bouncycastle/jce/provider/ExtCRLException.cause:Ljava/lang/Throwable;
  #15 = Methodref          #6.#13         // java/security/cert/CRLException."<init>":(Ljava/lang/String;)V
  #16 = Utf8               Code
{
  java.lang.Throwable cause;
    descriptor: Ljava/lang/Throwable;
    flags:

  org.bouncycastle.jce.provider.ExtCRLException(java.lang.String, java.lang.Throwable);
    descriptor: (Ljava/lang/String;Ljava/lang/Throwable;)V
    flags:
    Code:
      stack=2, locals=3, args_size=3
         0: aload_0
         1: aload_1
         2: invokespecial #15                 // Method java/security/cert/CRLException."<init>":(Ljava/lang/String;)V
         5: aload_0
         6: aload_2
         7: putfield      #14                 // Field cause:Ljava/lang/Throwable;
        10: return

  public java.lang.Throwable getCause();
    descriptor: ()Ljava/lang/Throwable;
    flags: ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
         0: aload_0
         1: getfield      #14                 // Field cause:Ljava/lang/Throwable;
         4: areturn
}

One processed with Jetifier:

Classfile /tmp/jetified/org/bouncycastle/jce/provider/ExtCRLException.class
  Last modified Oct 14, 2019; size 362 bytes
  MD5 checksum 76bc557706ee3480e53d88b21316913f
class org.bouncycastle.jce.provider.ExtCRLException extends java.security.cert.CRLException
  minor version: 0
  major version: 49
  flags: ACC_SUPER
Constant pool:
   #1 = Utf8               org/bouncycastle/jce/provider/ExtCRLException
   #2 = Class              #1             // org/bouncycastle/jce/provider/ExtCRLException
   #3 = Utf8               java/security/cert/CRLException
   #4 = Class              #3             // java/security/cert/CRLException
   #5 = Utf8               cause
   #6 = Utf8               Ljava/lang/Throwable;
   #7 = Utf8               <init>
   #8 = Utf8               (Ljava/lang/String;Ljava/lang/Throwable;)V
   #9 = Utf8               (Ljava/lang/String;)V
  #10 = NameAndType        #7:#9          // "<init>":(Ljava/lang/String;)V
  #11 = Methodref          #4.#10         // java/security/cert/CRLException."<init>":(Ljava/lang/String;)V
  #12 = NameAndType        #5:#6          // cause:Ljava/lang/Throwable;
  #13 = Fieldref           #2.#12         // org/bouncycastle/jce/provider/ExtCRLException.cause:Ljava/lang/Throwable;
  #14 = Utf8               getCause
  #15 = Utf8               ()Ljava/lang/Throwable;
  #16 = Utf8               Code
{
  java.lang.Throwable cause;
    descriptor: Ljava/lang/Throwable;
    flags:

  org.bouncycastle.jce.provider.ExtCRLException(java.lang.String, java.lang.Throwable);
    descriptor: (Ljava/lang/String;Ljava/lang/Throwable;)V
    flags:
    Code:
      stack=2, locals=3, args_size=3
         0: aload_0
         1: aload_1
         2: invokespecial #11                 // Method java/security/cert/CRLException."<init>":(Ljava/lang/String;)V
         5: aload_0
         6: aload_2
         7: putfield      #13                 // Field cause:Ljava/lang/Throwable;
        10: return

  public java.lang.Throwable getCause();
    descriptor: ()Ljava/lang/Throwable;
    flags: ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
         0: aload_0
         1: getfield      #13                 // Field cause:Ljava/lang/Throwable;
         4: areturn
}


Changes in the constants pool cause changes in the code (indices change), which causes different MD5 checksums. This means that signatures will not match any more.

This started happening in 3.6.0-beta01 because we are using Jetifier with copyUnmodifiedLibsAlso=true flag (previously it was false).

@Chris You can work around this by updating gradle.properties with:

android.jetifier.blacklist=.*bcprov.*

This will avoid Jetifying the bouncycastle library.

Thanks Ivan!

Pending fix in: https://android-review.googlesource.com/c/platform/frameworks/support/+/1151460

did this fix make it in for 3.6?

Jetifier 1.0.0-beta08 was released and has a fix for this.

To avoid waiting for new Android Studio you can workaround this in the meantime by forcing usage of a new version of jetifier in gradle:
buildscript {
   dependencies {
       classpath 'com.android.tools.build:gradle:x.y.z'
       classpath 'com.android.tools.build.jetifier:jetifier-processor:1.0.0-beta08' // <- Add this
   }
}

Jetifier 1.0.0-beta08, which has the fix for this issue, will be integrated into AGP 3.6.0-rc01 and 4.0.0-alpha06: https://android.googlesource.com/platform/tools/base/+/ef5e56702b626b6be642ecce7d0078b7b1a81bcb

Project: platform/frameworks/support
Branch: androidx-main

commit 15526d18462248f73d41272073badf3a18ebe733
Author: Alan Viverette <alanv@google.com>
Date:   Wed Sep 01 17:55:40 2021

    Parity between platform and AppCompat handling of tileify
   
    Relnote: "Fixed AppCompatProgressBar handling of layer-list progress bars"
    Fixes: 142004509
    Test: AppCompatProgressBarHelperTest
    Change-Id: I6ece3fa57734308b3fbd8c8d704eaf5c79c5d5de

A       appcompat/appcompat/src/androidTest/java/androidx/appcompat/widget/AppCompatProgressBarHelperTest.kt
M       appcompat/appcompat/src/main/java/androidx/appcompat/widget/AppCompatProgressBarHelper.java

https://android-review.googlesource.com/1817101