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.

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  3. 256 Bit Aes Key Example
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Creating a KeyGenerator Instance

Aes Key Generator

Feb 08, 2017  Powershell – Generate AES key February 8, 2017 February 8, 2017 Posted in Microsoft, Powershell, Security Specifically when dealing with the encryption and decryption of credentials within Powershell (next blog post), you will be dealing with AES keys to handle this securely. Encryption Key Generator. The all-in-one ultimate online toolbox that generates all kind of keys! Every coder needs All Keys Generator in. 64-bit 128-bit 256-bit.

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There's no AES-512. $ endgroup$ – Paul Uszak Jun 19 '18 at 11:40 3 $ begingroup$ If you need to know how to handle 256 bit keys, well, section 5.2 of FIPS 197 is a start (with Appendix A giving a real test vector, useful for finding misunderstandings).

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Before you can use the Java 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:

This example creates a KeyGenerator instance which can generate keys for the AES encryption algorithm.

256 Bit Aes Key Example

Initializing the KeyGenerator

After creating the 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:

The KeyGeneratorinit() method takes two parameters: The bit size of the keys to generate, and a SecureRandom that is used during key generation.

Generating a Key

Once the Java KeyGenerator instance is initialized you can use it to generate keys. Generating a key is done by calling the KeyGeneratorgenerateKey() method. Here is an example of generating a symmetric key:

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