Java Tutorial/Security/El Gamal

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El Gamal example with random key generation.

   <source lang="java">

import java.security.Key; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.SecureRandom; import java.security.Security; import javax.crypto.Cipher; public class MainClass {

 public static void main(String[] args) throws Exception {
   Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
   byte[] input = "ab".getBytes();
   Cipher cipher = Cipher.getInstance("ElGamal/None/NoPadding", "BC");
   KeyPairGenerator generator = KeyPairGenerator.getInstance("ElGamal", "BC");
   SecureRandom random = new SecureRandom();
   generator.initialize(128, random);
   KeyPair pair = generator.generateKeyPair();
   Key pubKey = pair.getPublic();
   Key privKey = pair.getPrivate();
   cipher.init(Cipher.ENCRYPT_MODE, pubKey, random);
   byte[] cipherText = cipher.doFinal(input);
   System.out.println("cipher: " + new String(cipherText));
   cipher.init(Cipher.DECRYPT_MODE, privKey);
   byte[] plainText = cipher.doFinal(cipherText);
   System.out.println("plain : " + new String(plainText));
 }

}</source>