A quick test to see if you have the JCE Unlimited Strength Jurisdiction Policy files installed. If you don't, in Java 6 you'll see 128. If you do, you'll see 2147483647. Thanks to http://stackoverflow.com/questions/11538746/check-for-jce-unlimited-strength-jurisdiction-policy-files

compile.sh

#!/bin/bash

javac Test.java
java Test

Test.java

import javax.crypto.Cipher;

class Test {
  public static void main(String[] args) {
    try {
      System.out.println("Hello World!");
      int maxKeyLen = Cipher.getMaxAllowedKeyLength("AES");
      System.out.println(maxKeyLen);
    } catch (Exception e){
      System.out.println("Sad world :(");
    }
  }
}

Very nice little util. Thanks dude.

Your code assumes it would crash for merely asking for bullshit policies. Here it doesn't crash and I had to test for maxKeyLen < Integer.MAX_VALUE.

Thanks dude. 👍

From my understanding 2147483647 (Integer.MAX_VALUE) is not a "bullshit policy" but rather the result you get if you're using OpenJDK which has no limits. See: https://www.eyrie.org/~eagle/notes/debian/jce-policy.html

Very useful. Thanks for posting.

As a one-liner: $JAVA_HOME/bin/jrunscript -e 'print (javax.crypto.Cipher.getMaxAllowedKeyLength("RC5") >= 256);'

one-liner - perfect, needed in bash script!

thanks for the info. Here mod one liner for WAS (IBM) on Win
C:\IBM\WebSphere\AppServer\java\8.0\bin\jrunscript -e "print (javax.crypto.Cipher.getMaxAllowedKeyLength('AES'))"
C:\IBM\WebSphere\AppServer\java_1.7.1_64\bin\jrunscript -e "print (javax.crypto.Cipher.getMaxAllowedKeyLength('AES'))"

If you want true/false
jrunscript -e "print (javax.crypto.Cipher.getMaxAllowedKeyLength('AES') >= 256)"
jrunscript -e "print (javax.crypto.Cipher.getMaxAllowedKeyLength('RC5') >= 256)"

Excellent work!

Thanks for this and the one liners!

JCE is enabled by default since java 8u161

• http://www.oracle.com/technetwork/java/javase/8u161-relnotes-4021379.html#JDK-8170157
• https://bugs.java.com/view_bug.do?bug_id=JDK-8170157

Thanks dude.

unzip -c ${JAVA_HOME}/jre/lib/security/local_policy.jar default_local.policy | grep -q javax.crypto.CryptoAllPermission && echo "unlimited JCE" || echo "vanilla JCE"

In Eclipse:

Great help, thanks for the post.