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This class provides the functionality of a secret (symmetric) key generator.

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Mar 30, 2020 TrueLicense is an open source engine for license management on the Java Virtual Machine. Due to its functional and modular design, it scales from simple to complex licensing schemas. TrueLicense features various interfaces for managing free trial periods, subscriptions, multiple editions, internationalization, privacy protection and more. 251. Initializes this key generator for a certain keysize, using a 252. user-provided source of randomness. 253. 254. @param keysize the keysize. This is an algorithm-specific metric, 255. specified in number of bits. 256. @param random the source of randomness for this key generator 257. I am interested in creating a licence file which will authenticate the use of a Java application. The application will open showing a window if the licence is not found or is invalid. I also want to create a licence generator program which I can use (probably obvious) to create licence files. That does nothing at all related to MAC addresses - it you want to use them, you will first have to retrieve it. This will help: Retrieving IP and MAC addresses for a LAN - there is a method there to retrive the current PC MAC address. But - don't waste too much time on this: MAC addresses can be spoofed, a PC will only have a MAC address if it has an active network connector, and most. 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.

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:

• Algorithm-Independent Initialization

  All key generators share the concepts of a keysize and a source of randomness. There is an init method in this KeyGenerator class that takes these two universally shared types of arguments. There is also one that takes just a keysize argument, 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 init methods, 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 init methods that have an AlgorithmParameterSpec argument. One also has a SecureRandom argument, 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:

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• AES (128)
• DES (56)
• DESede (168)
• HmacSHA1
• HmacSHA256

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These 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.