Re: How to decrypt AES encryption

[Sean Mullan]

Vishal Mahajan wrote:
Sean Mullan wrote:
Vishal Mahajan wrote:
Dominik Schadow wrote:
Yes, I tried the following code:
SecretKeySpec keySpec = new
SecretKeySpec(JavaUtils.getBytesFromFile(keyFile), algorithm);
    SecretKey key = skf.generateSecret(keySpec);
The exception I receive is
java.security.NoSuchAlgorithmException: AES not found
at javax.crypto.SecretKeyFactory.getInstance(SecretKeyFactory.java:86)
I think the problem is that you don't have a JCE provider in your jre 
that supports AES key generation this way. I am not sure which 
provider supports it.

Sun's JCE provider supports AES with J2SE/JDK 1.4.2 and up.

Yes J2SE/JDK 1.4.2 and up support AES algorithm for most of the crypto 
functions. What seems to be missing is a SecretKeyFactory supporting AES.
Right.
The solution (which I believe you hinted about before) is to just use 
the AES SecretKeySpec directly (since it is a subclass of SecretKey). 
There is no reason to use a SecretKeyFactory to convert it to a SecretKey.

--Sean