问题
i have a problem with the encrypt of the bytes with an AES 256 key. I already installed the policy. Here's what I've done:
- download the file: http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html
- I moved the files local_policy and US_export_policy to the directory /Library/Java/JavaVirtualMachines/jdk1.7.0_40.jdk/Contents/Home/jre/lib/security
- i restart the mac
But still I get an error message with the following code:
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
keyGenerator.init(256);
SecretKey secretKey = keyGenerator.generateKey();
Cipher decryption = Cipher.getInstance("AES/CBC/PKCS5PADDING");
decryption.init(Cipher.DECRYPT_MODE, secretKey,
new IvParameterSpec(secretKey.getEncoded())); // <-- Illegal key size
My Java version:
java version "1.7.0_40"
Java(TM) SE Runtime Environment (build 1.7.0_40-b43)
Java HotSpot(TM) 64-Bit Server VM (build 24.0-b56, mixed mode)
What i have to do, to use the 256 AES encryption?
回答1:
Policy files should resolve the issue. Check the path environment variable to confirm that you are using the same jre which has policy files.
回答2:
IMPORTANT: you have know you jre location. eg: in my compute have C:\Java\jre7\lib\security and C:\Java\jdk1.7.0_02\jre\lib\security, but eclipse show the jre is C:\Java\jre7\lib\security,so you must copy two file into here.
回答3:
What I did
downloaded policy file from this location
http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html
paste in location
jre/lib/security/
and it workes....
来源：https://stackoverflow.com/questions/20802380/java-aes-256-java-security-invalidkeyexception-illegal-key-size-after-installat