Decrypt AES encrypted file in java

Question

I have a file encrypted with java application using AES. I also have a key file was encrypted with. But i can\'t understand how to use the key to decrypt file. Most tutorials an

Answer 1

The answer could be simply to put the key data as bytes into a SecretKeySpec like this:

SecretKeySpec aesKey = new SecretKeySpec(myKeyData, "AES");

Note that SecretKeySpec implements the Key interface, so you can use it directly in a Cipher.init() method. So there is no SecretKeyFactory needed, which you would use otherwise.