Java实现AES加密,异常java.security.InvalidKeyException: Illegal key size 的解决

你的名字 2022-08-21 02:12 186阅读 0赞

Java实现AES加密，抛出异常如下：  
java.security.InvalidKeyException: Illegal key size

代码参考 [http://my.oschina.net/Jacker/blog/86383?fromerr=x3l5xL1a][http_my.oschina.net_Jacker_blog_86383_fromerr_x3l5xL1a]

原因：

Illegal key size or default parameters 是指密钥长度受限制，

java运行时环境读到的是受限的policy文件。

policy文件位于$\{java\_home\}/jre/lib/security 目录下。

这种限制是因为美国对软件出口的控制。

解决办法：

去除该限制只需下载 Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files，

覆盖上述目录下的对应jar文件(local\_policy.jar, US\_export\_policy.jar)即可。  
  
下载地址：  
JDK6 [http://www.oracle.com/technetwork/java/javase/downloads/jce-6-download-429243.html][http_www.oracle.com_technetwork_java_javase_downloads_jce-6-download-429243.html]  
JDK7 [http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html][http_www.oracle.com_technetwork_java_javase_downloads_jce-7-download-432124.html]  
JDK8 [http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html][http_www.oracle.com_technetwork_java_javase_downloads_jce8-download-2133166.html]

下载包的readme.txt 有安装说明，即替换

$\{jdk\_home\}/jre/lib/security

$\{jre\_home\}/lib/security

目录下的 local\_policy.jar 和 US\_export\_policy.jar 文件。

参考 [http://stackoverflow.com/questions/6481627/java-security-illegal-key-size-or-default-parameters][http_stackoverflow.com_questions_6481627_java-security-illegal-key-size-or-default-parameters]

[http_my.oschina.net_Jacker_blog_86383_fromerr_x3l5xL1a]: http://my.oschina.net/Jacker/blog/86383?fromerr=x3l5xL1a
[http_www.oracle.com_technetwork_java_javase_downloads_jce-6-download-429243.html]: http://www.oracle.com/technetwork/java/javase/downloads/jce-6-download-429243.html
[http_www.oracle.com_technetwork_java_javase_downloads_jce-7-download-432124.html]: http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html
[http_www.oracle.com_technetwork_java_javase_downloads_jce8-download-2133166.html]: http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html
[http_stackoverflow.com_questions_6481627_java-security-illegal-key-size-or-default-parameters]: http://stackoverflow.com/questions/6481627/java-security-illegal-key-size-or-default-parameters