Java SE strong cryptography for Java 7? [closed]

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Closed 3 years ago.

The preview release of Java 7 seems to be missing JCE package for unlimited cryptography strength. Has someone stumbled upon such?

回答1:

http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html

回答2:

You need to install the missing JCE package.

1. Locate your jre lib/security directory

   $ which java
   /usr/bin/java
   
   # Do this recursively till you find the java installation folder
   $ ls -la /usr/bin/java 
   

On Linux it should be by default: /usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/security/

On Windows it should be by default: C:\Program Files\Java\jre7\lib\security

2. Download the Java Cryptography Extension (JCE)

Download for Java 6: http://www.oracle.com/technetwork/java/javase/downloads/jce-6-download-429243.html

Download for Java 7: http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html

Download for Java 8: http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html

3. Install the JCE

Extract the downloaded zip and place the two .jar files: US_export_policy.jar and local_policy.jar into your jre/lib/security folder.

Overwrite old files if any.

来源：https://stackoverflow.com/questions/6843776/java-se-strong-cryptography-for-java-7