Add Java Cryptography Extension (JCE) to all Java 8 Development Kit installations on macOS

install.sh

#!/bin/bash

# This script symlinks the Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files
# to all Java 8 Development Kit installations on macOS. The original policy files are backed up as *.backup.
#
# 1. Download: http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html
# 2. Unpack the zip file somewhere, e.g. /Library/Java/JavaCryptographyExtensions8
# 3. Put this script in the directory where you put the unpacked files
# 4. Run 'sudo ./install.sh' to make the cryptography extensions available to all JDK 8 installations
#
# Just re-run this script after adding a new JDK 8 installation.
#
# Test: javax.crypto.Cipher.getMaxAllowedKeyLength("AES") should return 2147483647 (Integer.MAX_VALUE) instead of 128.

JDK_ROOT=/Library/Java/JavaVirtualMachines
JAVA_CRYPTOGRAPHY_EXTENSIONS_DIR=`pwd`

function symlink_crypto_jar_with_backup {
	DIR=$1
	FILE=$2

	cd $DIR
	if [ ! -h $FILE ]; then
		mv $FILE $FILE.backup
	fi
	ln -sf $JAVA_CRYPTOGRAPHY_EXTENSIONS_DIR/$FILE
}

for JDK8 in $JDK_ROOT/jdk1.8*.jdk; do
	for JAR in US_export_policy.jar local_policy.jar; do
		symlink_crypto_jar_with_backup $JDK8/Contents/Home/jre/lib/security $JAR
	done
	echo Enabled Java Cryptography Extensions for JDK 8: `basename $JDK8`
done