Java License Key Generator Example
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 multiple techniques to develop key based software activation. Mostly, you can classify them into offline and online approaches. Offline activation is simple to implement. True License is both a Java license key generator and a license key validator, meaning that you can use it on your server to create license keys, and then use it again in your Java application (presumably a Java GUI application) to install and verify the license that you generate. The Java Keytool is a command line tool which can generate public key / private key pairs and store them in a Java KeyStore.The Keytool executable is distributed with the Java SDK (or JRE), so if you have an SDK installed you will also have the Keytool executable. Java Software Licensing. To add license checking to a Java application you import the com.nuvovis.licensing. License class which wraps the Licensing Library and put the library in your execution path. You can then call the checkLicense method to load the license information and check that the user has a valid license. May 11, 2018 License4J comes with License Manager GUI application to generate and store software license files and cryptographically secure serial numbers. License4J Auto License Generation and Activation Server is a web application which handles license generation, auto activation, manual activation, deactivation, online key validation and blacklist check.
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.
License Key Generator Online
Just a quick note that if you happen to be looking for a license key generator (or 'license key manager') for a Java desktop (Swing) application, I've been taking a look at the TrueLicense library on java.net, and although it is several years old now, it seems to work well, and the author certainly put a lot of time and thought into it.
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. The only difference between the two is the initialization of the object:
- Algorithm-Independent Initialization
All key generators share the concepts of a keysize and a source of randomness. There is an
initmethod in this KeyGenerator class that takes these two universally shared types of arguments. There is also one that takes just akeysizeargument, and uses the SecureRandom implementation of the highest-priority installed provider as the source of randomness (or a system-provided source of randomness if none of the installed providers supply a SecureRandom implementation), and one that takes just a source of randomness.Since no other parameters are specified when you call the above algorithm-independent
initmethods, it is up to the provider what to do about the algorithm-specific parameters (if any) to be associated with each of the keys. - Algorithm-Specific Initialization
For situations where a set of algorithm-specific parameters already exists, there are two
initmethods that have anAlgorithmParameterSpecargument. One also has aSecureRandomargument, while the other uses the SecureRandom implementation of the highest-priority installed provider as the source of randomness (or a system-provided source of randomness if none of the installed providers supply a SecureRandom implementation).
In case the client does not explicitly initialize the KeyGenerator (via a call to an init method), each provider must supply (and document) a default initialization.
Every implementation of the Java platform is required to support the following standard KeyGenerator algorithms with the keysizes in parentheses:
AES(128)DES(56)DESede(168)HmacSHA1HmacSHA256
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