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How to create a secure random AES key in Java? Ask Question Asked 6 years, 3 months ago. For AES though, the random number generator may be of more importance - you may for instance want to use a slower, more secure, FIPS certified random number generator instead of the default. The Java KeyGenerator class (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. This class provides the functionality of a secret (symmetric) key generator. Key generators are constructed using one of the getInstance class methods of this class. KeyGenerator objects are reusable, i.e., after a key has been generated, the same KeyGenerator object can be re-used to generate further keys. There are two ways to generate a key: in an algorithm-independent manner, and in an algorithm-specific manner. Random Key Generator for Passwords, Encryption Keys, WPA Keys, WEP Keys, CodeIgniter Keys, Laravel Keys, and much more Don't got what you're looking for! Send us a mail or contribute on Github. To generate a random string, concatenate characters drawn randomly from the set of acceptable symbols until the string reaches the desired length.
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Java provides KeyGenerator class this class is used to generate secret keys and objects of this class are reusable.
To generate keys using the KeyGenerator class follow the steps given below.
Step 1: Create a KeyGenerator object
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The KeyGenerator class provides getInstance() method which accepts a String variable representing the required key-generating algorithm and returns a KeyGenerator object that generates secret keys.
Create KeyGenerator object using the getInstance() method as shown below.
Step 2: Create SecureRandom object
The SecureRandom class of the java.Security package provides a strong random number generator which is used to generate random numbers in Java. Instantiate this class as shown below.
Step 3: Initialize the KeyGenerator
The KeyGenerator class provides a method named init() this method accepts the SecureRandom object and initializes the current KeyGenerator.
Initialize the KeyGenerator object created in the previous step using the init() method.
Example
Following example demonstrates the key generation of the secret key using the KeyGenerator class of the javax.crypto package.
Output
The above program generates the following output −