Crypto2-1

Valeri173

Nov 22nd, 2024

Never

Add comment

Not a member of Pastebin yet? Sign Up, it unlocks many cool features!

text 2.71 KB | None | 0 0

raw download clone embed print report

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.SecureRandom;
import java.util.Base64;
public class CryptoAES {
public static SecretKey generateKey(String password, byte[] salt) throws Exception {
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
PBEKeySpec spec = new PBEKeySpec(password.toCharArray(), salt, 65536, 256);
SecretKey tmp = factory.generateSecret(spec);
return new SecretKeySpec(tmp.getEncoded(), "AES");
}
public static String encrypt(String plaintext, SecretKey key, IvParameterSpec iv) throws Exception {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key, iv);
byte[] encrypted = cipher.doFinal(plaintext.getBytes());
return Base64.getEncoder().encodeToString(encrypted);
}
public static String decrypt(String ciphertext, SecretKey key, IvParameterSpec iv) throws Exception {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, key, iv);
byte[] decrypted = cipher.doFinal(Base64.getDecoder().decode(ciphertext));
return new String(decrypted);
}
public static void main(String[] args) {
try {
String password = "securepassword123";
byte[] salt = new byte[16];
SecureRandom random = new SecureRandom();
random.nextBytes(salt);
System.out.println("Salt (трябва да се сподели): " + Base64.getEncoder().encodeToString(salt));
byte[] ivBytes = new byte[16];
random.nextBytes(ivBytes);
IvParameterSpec iv = new IvParameterSpec(ivBytes);
System.out.println("IV (трябва да се изпрати с криптираното съобщение): " + Base64.getEncoder().encodeToString(ivBytes));
SecretKey senderKey = generateKey(password, salt);
String message = "Това е тайно съобщение!";
String encryptedMessage = encrypt(message, senderKey, iv);
System.out.println("Криптирано съобщение: " + encryptedMessage);
SecretKey receiverKey = generateKey(password, salt);
String decryptedMessage = decrypt(encryptedMessage, receiverKey, iv);
System.out.println("Декриптирано съобщение: " + decryptedMessage);
} catch (Exception e) {
e.printStackTrace();
}
}
}

Add Comment

Please, Sign In to add comment