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.
Creating a KeyGenerator Instance
Some situations require strong random values, such as when creating high-value and long-lived secrets like RSA public and private keys. To help guide applications in selecting a suitable strong SecureRandom implementation, starting from JDK 8 Java distributions include a list of known strong SecureRandom implementations in the securerandom.strongAlgorithms property of the java.security.
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:
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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 KeyGenerator instance:
The
KeyGenerator 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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Once the Java
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: Thomson wifi key generator android.
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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.
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There are two ways to generate a key: in an algorithm-independent manner, and in an algorithm-specific manner. The only difference between the two is the initialization of the object:
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In case the client does not explicitly initialize the KeyGenerator (via a call to an
init Adobe cs3 master collection key generator download free. method), each provider must supply (and document) a default initialization.
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Every implementation of the Java platform is required to support the following standard
KeyGenerator algorithms with the keysizes in parentheses:
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How To Generate A Random Key In JavaThese algorithms are described in the KeyGenerator section of the Java Cryptography Architecture Standard Algorithm Name Documentation. Consult the release documentation for your implementation to see if any other algorithms are supported.Comments are closed.
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