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 :(");
    }
  }
}

https://gist.github.com/evaryont/6786915#gistcomment-2987440

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

https://gist.github.com/evaryont/6786915#gistcomment-2249728

128 / 2147483647:

${JAVA_HOME}/bin/jrunscript -e "print (javax.crypto.Cipher.getMaxAllowedKeyLength('AES'))"

true / false:

${JAVA_HOME}/bin/jrunscript -e "print (javax.crypto.Cipher.getMaxAllowedKeyLength('AES') >= 256)"
${JAVA_HOME}/bin/jrunscript -e "print (javax.crypto.Cipher.getMaxAllowedKeyLength('RC5') >= 256)"