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.
- Aes 128 Key Generator
- Random Aes 256 Key Generator
- Generate Random Aes Encryption Key
- Aes 128 Encryption
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Creating a KeyGenerator Instance
Aes 128 Key Generator
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
This example creates a
KeyGenerator instance which can generate keys for the AES encryption algorithm.
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
init() method takes two parameters: The bit size of the keys to generate, and a
SecureRandom that is used during key generation.
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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
generateKey() method. Here is an example of generating a symmetric key:
Given a message, We would like to encrypt & decrypt plain/cipher text using AES CBC algorithm in java. We will perform following operations:
Random Aes 256 Key Generator
- Generate symmetric key using AES-128.
- Generate initialization vector used for CBC (Cipher Block Chaining).
- Encrypt message using symmetric key and initialization vector.
- Decrypt the encrypted message using symmetric key and initialization vector.
Program to encrypt & decrypt message in java:
Generate Random Aes Encryption Key
- Given encryption key & initialization vector.
- We will use AES algorithm to encrypt & decrypt input text.
- CryptoMngr is used generate cipher text from plain text & vice versa.
CryptoMngrClient Class: CryptoMngrClient class will generate random input message and will invoke CryptoMngr to encrypt & decrypt input message.