CODEWITHSUNDEEP
javaandroidcryptographyaes
rhololkeolke
rhololkeolke

Reputation: 746

AES - Generating a key and Loading it gives an Invalid Key Exception

I've been trying to get AES encryption and decryption working for some time in Java. Unfortunately I haven't had much luck. Right now I can generate a key in one method the code for which is shown

keyGen = KeyGenerator.getInstance("AES");
SecureRandom random = SecureRandom.getInstance();
keyGen.init(size, random);
SecretKey key = keyGen.generateKey();
AesKey = key.getEncoded();

To use the key I convert it back to a SecretKeySpec and attempt to encrypt the input bytes. My code for encryption is shown below.

SecretKeySpec keySpec = new SecretKeySpec(AesKey, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, keySpec);
return cipher.doFinal(input);

However, when I call the cipher.init line I get an InvalidKeyException.

Am I generating the key incorrectly? Am I loading the key incorrectly? Is it a combination? I'm stuck on this so any insight would be appreciated.

Update

So I didn't realize it, but the part that was calling the generate function was passing in an invalid size. When I found that bit of the code and changed it to 256 everything works as it should.

Upvotes: 2

Views: 2127

Answers (1)

rhololkeolke
rhololkeolke

Reputation: 746

The code that was calling the generate function was passing an invalid size. I thought that would be caught by the keyGen.generateKey() line but I was mistaken. It didn't throw the error until I actually tried to use the key. Changing the code that called the generate function so that size was 256 fixed the problem.

Upvotes: 1

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