AES KeyPairGenerator Not Recognised

Question

I have an issue with my java code. I\'m trying to encrypt a file. However, when I run my java code I get \"java.security.InvalidKeyException: Invalid AES key length: 162 byt

Answer 1

How can you use a keypair generator for AES? AES is a symmetric key algorithm. Refer this link. That means if you encrypt data using a key "k", then you will have to decrypt it also using the same key "k".

But when you generate key pair, as the name suggests, two keys are generated and if you encrypt using one of the keys, you can decrypt only using the other key. This is the base for PKI.

If you want to use keypair generator use an algorithm like "rsa" or "dsa" in the getInstance() method like this :

KeyPairGenerator keygen=KeyPairGenerator.getInstance("rsa");

I think your code should now work fine after making the above change.