- Java Cryptography Tutorial
- Message Digest and MAC
The KCV is the 'Key Check Value' for the key, calculated by assuming the key/components are 3DES keys, and encrypting a string of binary zeroes. The KCV is the first six hex digits of the resulting ciphertext.
- Keys and Key Store
- Generating Keys
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Java provides KeyGenerator class this class is used to generate secret keys and objects of this class are reusable.
To generate keys using the KeyGenerator class follow the steps given below.
Step 1: Create a KeyGenerator object
The KeyGenerator class provides getInstance() method which accepts a String variable representing the required key-generating algorithm and returns a KeyGenerator object that generates secret keys.
Create KeyGenerator object using the getInstance() method as shown below.
Step 2: Create SecureRandom object
The SecureRandom class of the java.Security package provides a strong random number generator which is used to generate random numbers in Java. Instantiate this class as shown below.
Step 3: Initialize the KeyGenerator
The KeyGenerator class provides a method named init() this method accepts the SecureRandom object and initializes the current KeyGenerator.
Initialize the KeyGenerator object created in the previous step using the init() method.
Des 16 Key Generator Java Free
Example
Following example demonstrates the key generation of the secret key using the KeyGenerator class of the javax.crypto package.
Output
Des 16 Key Generator Java Code
The above program generates the following output −