Encryption and Decryption using Symmetric Keys
import java.security.InvalidKeyException;
import java.security.Key;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
public class Main {
static String algorithm = "DESede";
static Key key = KeyGenerator.getInstance(algorithm).generateKey();
static Cipher cipher = Cipher.getInstance(algorithm);
public static void main(String[] args) throws Exception {
byte[] encryptionBytes = encrypt("input");
System.out.println("Recovered: " + decrypt(encryptionBytes));
}
private static byte[] encrypt(String input) throws InvalidKeyException, BadPaddingException,
IllegalBlockSizeException {
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] inputBytes = input.getBytes();
return cipher.doFinal(inputBytes);
}
private static String decrypt(byte[] encryptionBytes) throws InvalidKeyException,
BadPaddingException, IllegalBlockSizeException {
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] recoveredBytes = cipher.doFinal(encryptionBytes);
String recovered = new String(recoveredBytes);
return recovered;
}
}
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