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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

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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.

Initializing the KeyGenerator

After creating the KeyGenerator instance you must initialize it. Battlefield 2142 deluxe edition cd key generator. 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:

The Java KeyStore is a database that can contain keys. A Java KeyStore is represented by the KeyStore (java.security.KeyStore) class. A KeyStore can be written to disk and read again. The KeyStore as a whole can be protected with a password, and each key entry in the KeyStore can be protected with its own password. This makes the KeyStore class a useful mechanism to handle encryption keys securely.

A KeyStore can hold the following types of keys:

• Private keys
• Public keys + certificates
• Secret keys

Private and public keys are used in asymmetric encryption. A public key can have an associated certificate. A certificate is a document that verifies the identity of the person, organization or device claiming to own the public key. A certificate is typically digitally signed by the verifying party as proof.

Secret keys are used in symmetric encryption. In many cases symmetric keys are negotiated when a secure connection is set up. Therefore you will more often be storing public and private keys in a KeyStore than secret keys.

Creating a KeyStore

You can create a Java KeyStore instance by calling its getInstance() method. Here is an example of creating a KeyStore instance:

This example creates a KeyStore instance of Java's default type. It is also possible to create other types of KeyStore instance by passing a different parameter to the getInstance() method. For instance, here is an example that creates a PKCS12 type KeyStore:

Loading the KeyStore

Before a KeyStore instance can be used, it must be loaded. KeyStore instances are often written to disk or other kinds of storage for later use. That is why the KeyStore class assumes that you must read its data in before you can use it. However, it is possible to initialize an empty KeyStore instance with no data, as you will see later.

Loading the KeyStore data from a file or other storage is done by calling the KeyStoreload() method. The load() takes two parameters:

1. An InputStream from which to load the KeyStore data.
2. A char[] (char array) containing the KeyStore password.

Here is an example of loading a Java KeyStore:

This example loads the KeyStore file located in the keystore.ks file.

If you don't want to load any data into the KeyStore, just pass null for the InputStream parameter. Here is how loading an empty KeyStore looks:

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You must always load the KeyStore instance, either with data or with null. Otherwise the KeyStore is uninitialized, and all calls to its methods will throw an exception.

Getting Keys

You can get the keys of a Java KeyStore instance via its getEntry() method. A KeyStore entry is mapped to an alias which identifies the key, and is protected with a key password. Thus, to access a key you must pass the key alias and password to the getEntry() method. Here is an example of accessing a key entry in a KeyStore instance:

If you know that the key entry you want to access is a private key, you can cast the KeyStore.Entry instance to a KeyStore.PrivateKeyEntry. Here is how that looks:

After casting to a KeyStore.PrivateKeyEntry you can access the private key, certificate and certificate chain via these methods:

• getPrivateKey()
• getCertificate()
• getCertificateChain()

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Setting Keys

You can also set keys into a KeyStore instance. Here is an example of setting a secret key (symmetric key) into a KeyStore instance:

Storing the KeyStore

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Sometimes you may want to store a KeyStore to some storage (disk, database etc.) so you can load it again another time. You store a KeyStore by calling the store() method. Here is an example of storing a KeyStore

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