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@Anass-ABEA
Last active Nov 11, 2021
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AES ENCRYPTION
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.GCMParameterSpec;
import java.util.Base64;
/**
* Possible KEY_SIZE values are 128, 192 and 256
* Possible T_LEN values are 128, 120, 112, 104 and 96
*/
public class AES {
private SecretKey key;
private final int KEY_SIZE = 128;
private final int T_LEN = 128;
private Cipher encryptionCipher;
public void init() throws Exception {
KeyGenerator generator = KeyGenerator.getInstance("AES");
generator.init(KEY_SIZE);
key = generator.generateKey();
}
public String encrypt(String message) throws Exception {
byte[] messageInBytes = message.getBytes();
encryptionCipher = Cipher.getInstance("AES/GCM/NoPadding");
encryptionCipher.init(Cipher.ENCRYPT_MODE, key);
byte[] encryptedBytes = encryptionCipher.doFinal(messageInBytes);
return encode(encryptedBytes);
}
public String decrypt(String encryptedMessage) throws Exception {
byte[] messageInBytes = decode(encryptedMessage);
Cipher decryptionCipher = Cipher.getInstance("AES/GCM/NoPadding");
GCMParameterSpec spec = new GCMParameterSpec(T_LEN, encryptionCipher.getIV());
decryptionCipher.init(Cipher.DECRYPT_MODE, key, spec);
byte[] decryptedBytes = decryptionCipher.doFinal(messageInBytes);
return new String(decryptedBytes);
}
private String encode(byte[] data) {
return Base64.getEncoder().encodeToString(data);
}
private byte[] decode(String data) {
return Base64.getDecoder().decode(data);
}
public static void main(String[] args) {
try {
AES aes = new AES();
aes.init();
String encryptedMessage = aes.encrypt("TheXCoders");
String decryptedMessage = aes.decrypt(encryptedMessage);
System.err.println("Encrypted Message : " + encryptedMessage);
System.err.println("Decrypted Message : " + decryptedMessage);
} catch (Exception ignored) {
}
}
}
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