What are some examples of cryptography in Java?

What are some examples of cryptography in Java?

Java provides several libraries for cryptography, such as JCE (Java Cryptography Extension). Examples include AES encryption, RSA key generation, and SHA-256 hashing.

Can you show me a code example for AES encryption?

Sure! Here's a simple example of AES encryption in Java:

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class AESCrypto {
    public static void main(String[] args) throws Exception {
        String data = "Hello, World!";
        KeyGenerator keyGen = KeyGenerator.getInstance("AES");
        keyGen.init(128);
        SecretKey secretKey = keyGen.generateKey();

        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        byte[] encryptedData = cipher.doFinal(data.getBytes());

        System.out.println("Encrypted Data: " + new String(encryptedData));
    }
}

What about RSA key generation?

Here's a simple example of RSA key generation in Java:

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;

public class RSACrypto {
    public static void main(String[] args) throws NoSuchAlgorithmException {
        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
        keyGen.initialize(2048);
        KeyPair keyPair = keyGen.generateKeyPair();

        System.out.println("Public Key: " + keyPair.getPublic());
        System.out.println("Private Key: " + keyPair.getPrivate());
    }
}