javax.crypto.KeyGenerator
) is used to generate symmetric encryption keys. A symmetric encryption key is a key that is used for both encryption and decryption of data, by a symmetric encryption algorithm. In this Java KeyGenerator tutorial I will show you how to generate symmetric encryption keys. KeyGenerator
class you must create a KeyGenerator
instance. You create a KeyGenerator
instance by calling the static method getInstance()
passing as parameter the name of the encryption algorithm to create a key for. Here is an example of creating a Java KeyGenerator
instance: KeyGenerator
instance which can generate keys for the AES encryption algorithm. KeyGenerator
instance you must initialize it. Initializing a KeyGenerator
instance is done by calling its init()
method. Here is an example of initializing a KeyGenerator
instance: KeyGenerator
init()
method takes two parameters: The bit size of the keys to generate, and a SecureRandom
that is used during key generation. KeyGenerator
instance is initialized you can use it to generate keys. Generating a key is done by calling the KeyGenerator
generateKey()
method. Here is an example of generating a symmetric key: