InvalidKeyException java.security.InvalidKeyException: No installed provider supports this key: (null)

Question

I have two classes, one is main class and another is the implementation of AES.

However, in my AES class i have a method to decrypt a string, but whenever i run it, it g

Answer 1

secretKey is clearly null.

Other problems:

• You aren't using the input parameter cipherText.
• The input parameter cipherText should be a byte[], not a String: cipher text is binary, and String is not a container for binary data.
• The result string strDecryptedText should be a local variable, not a member variable.