Есть хороший пример того, как зашифровать и расшифровать изображения и другие файлы с помощью AES на Android?
Android шифрование/дешифрование с использованием AES
Ответ 1
Предупреждение. Этот ответ содержит код, который вы не должны использовать, поскольку он небезопасен (используя SHA1PRNG для вывода ключей и использования AES в режиме ECB)
Вместо этого используйте PBKDF2WithHmacSHA1 для деривации ключей и AES в режиме CBC или GCM (GCM обеспечивает как конфиденциальность, так и целостность)
Вы можете использовать такие функции:
private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(clear);
return encrypted;
}
private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
}
И вызовите их следующим образом:
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos); // bm is the bitmap object
byte[] b = baos.toByteArray();
byte[] keyStart = "this is a key".getBytes();
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(keyStart);
kgen.init(128, sr); // 192 and 256 bits may not be available
SecretKey skey = kgen.generateKey();
byte[] key = skey.getEncoded();
// encrypt
byte[] encryptedData = encrypt(key,b);
// decrypt
byte[] decryptedData = decrypt(key,encryptedData);
Это должно работать, я использую аналогичный код в проекте прямо сейчас.
Ответ 2
import java.security.AlgorithmParameters;
import java.security.SecureRandom;
import java.security.spec.KeySpec;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
class SecurityUtils {
private static final byte[] salt = { (byte) 0xA4, (byte) 0x0B, (byte) 0xC8,
(byte) 0x34, (byte) 0xD6, (byte) 0x95, (byte) 0xF3, (byte) 0x13 };
private static int BLOCKS = 128;
public static byte[] encryptAES(String seed, String cleartext)
throws Exception {
byte[] rawKey = getRawKey(seed.getBytes("UTF8"));
SecretKeySpec skeySpec = new SecretKeySpec(rawKey, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
return cipher.doFinal(cleartext.getBytes("UTF8"));
}
public static byte[] decryptAES(String seed, byte[] data) throws Exception {
byte[] rawKey = getRawKey(seed.getBytes("UTF8"));
SecretKeySpec skeySpec = new SecretKeySpec(rawKey, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
return cipher.doFinal(data);
}
private static byte[] getRawKey(byte[] seed) throws Exception {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(seed);
kgen.init(BLOCKS, sr); // 192 and 256 bits may not be available
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
return raw;
}
private static byte[] pad(byte[] seed) {
byte[] nseed = new byte[BLOCKS / 8];
for (int i = 0; i < BLOCKS / 8; i++)
nseed[i] = 0;
for (int i = 0; i < seed.length; i++)
nseed[i] = seed[i];
return nseed;
}
public static byte[] encryptPBE(String password, String cleartext)
throws Exception {
SecretKeyFactory factory = SecretKeyFactory
.getInstance("PBKDF2WithHmacSHA1");
KeySpec spec = new PBEKeySpec(password.toCharArray(), salt, 1024, 256);
SecretKey tmp = factory.generateSecret(spec);
SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, secret);
AlgorithmParameters params = cipher.getParameters();
byte[] iv = params.getParameterSpec(IvParameterSpec.class).getIV();
return cipher.doFinal(cleartext.getBytes("UTF-8"));
}
public static String decryptPBE(SecretKey secret, String ciphertext,
byte[] iv) throws Exception {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, secret, new IvParameterSpec(iv));
return new String(cipher.doFinal(ciphertext.getBytes()), "UTF-8");
}
}
Ответ 3
Как упомянуто Nacho.L PBKDF2WithHmacSHA1, используется деривация, поскольку она более защищена.
import android.util.Base64;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
public class AESEncyption {
private static final int pswdIterations = 10;
private static final int keySize = 128;
private static final String cypherInstance = "AES/CBC/PKCS5Padding";
private static final String secretKeyInstance = "PBKDF2WithHmacSHA1";
private static final String plainText = "sampleText";
private static final String AESSalt = "exampleSalt";
private static final String initializationVector = "8119745113154120";
public static String encrypt(String textToEncrypt) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(getRaw(plainText, AESSalt), "AES");
Cipher cipher = Cipher.getInstance(cypherInstance);
cipher.init(Cipher.ENCRYPT_MODE, skeySpec, new IvParameterSpec(initializationVector.getBytes()));
byte[] encrypted = cipher.doFinal(textToEncrypt.getBytes());
return Base64.encodeToString(encrypted, Base64.DEFAULT);
}
public static String decrypt(String textToDecrypt) throws Exception {
byte[] encryted_bytes = Base64.decode(textToDecrypt, Base64.DEFAULT);
SecretKeySpec skeySpec = new SecretKeySpec(getRaw(plainText, AESSalt), "AES");
Cipher cipher = Cipher.getInstance(cypherInstance);
cipher.init(Cipher.DECRYPT_MODE, skeySpec, new IvParameterSpec(initializationVector.getBytes()));
byte[] decrypted = cipher.doFinal(encryted_bytes);
return new String(decrypted, "UTF-8");
}
private static byte[] getRaw(String plainText, String salt) {
try {
SecretKeyFactory factory = SecretKeyFactory.getInstance(secretKeyInstance);
KeySpec spec = new PBEKeySpec(plainText.toCharArray(), salt.getBytes(), pswdIterations, keySize);
return factory.generateSecret(spec).getEncoded();
} catch (InvalidKeySpecException e) {
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return new byte[0];
}
}
Ответ 4
Старый вопрос, но я обновляю ответы, поддерживающие Android до и после 4.2 и учитывая все последние изменения в соответствии с блогами разработчиков Android
Плюс я оставляю рабочий пример в моем github repo.
import java.nio.charset.Charset;
import java.security.AlgorithmParameters;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
/*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will Google be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, as long as the origin is not misrepresented.
*
* @author: Ricardo Champa
*
*/
public class MyCipher {
private final static String ALGORITHM = "AES";
private String mySecret;
public MyCipher(String mySecret){
this.mySecret = mySecret;
}
public MyCipherData encryptUTF8(String data){
try{
byte[] bytes = data.toString().getBytes("utf-8");
byte[] bytesBase64 = Base64.encodeBase64(bytes);
return encrypt(bytesBase64);
}
catch(Exception e){
MyLogs.show(e.getMessage());
return null;
}
}
public String decryptUTF8(byte[] encryptedData, IvParameterSpec iv){
try {
byte[] decryptedData = decrypt(encryptedData, iv);
byte[] decodedBytes = Base64.decodeBase64(decryptedData);
String restored_data = new String(decodedBytes, Charset.forName("UTF8"));
return restored_data;
} catch (Exception e) {
MyLogs.show(e.getMessage());;
return null;
}
}
//AES
private MyCipherData encrypt(byte[] raw, byte[] clear) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, ALGORITHM);
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
//solved using PRNGFixes class
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] data = cipher.doFinal(clear);
AlgorithmParameters params = cipher.getParameters();
byte[] iv = params.getParameterSpec(IvParameterSpec.class).getIV();
return new MyCipherData(data, iv);
}
private byte[] decrypt(byte[] raw, byte[] encrypted, IvParameterSpec iv) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, ALGORITHM);
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
}
private byte[] getKey() throws Exception{
byte[] keyStart = this.mySecret.getBytes("utf-8");
KeyGenerator kgen = KeyGenerator.getInstance(ALGORITHM);
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
// if (android.os.Build.VERSION.SDK_INT >= 17) {
// sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
// } else {
// sr = SecureRandom.getInstance("SHA1PRNG");
// }
sr.setSeed(keyStart);
kgen.init(128, sr); // 192 and 256 bits may not be available
SecretKey skey = kgen.generateKey();
byte[] key = skey.getEncoded();
return key;
}
////////////////////////////////////////////////////////////
private MyCipherData encrypt(byte[] data) throws Exception{
return encrypt(getKey(),data);
}
private byte[] decrypt(byte[] encryptedData, IvParameterSpec iv) throws Exception{
return decrypt(getKey(),encryptedData, iv);
}
}
Ответ 5
Если вы шифруете текстовый файл, может оказаться полезным следующий тест/образец. Он выполняет следующие действия:
- Создайте поток байтов,
- завершает шифрование AES,
- завершите его следующей обработкой текста.
-
и, наконец, буферизирует его
// AESdemo public class AESdemo extends Activity { boolean encryptionIsOn = true; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_aesdemo); // needs <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> String homeDirName = Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + getPackageName(); File file = new File(homeDirName, "test.txt"); byte[] keyBytes = getKey("password"); try { File dir = new File(homeDirName); if (!dir.exists()) dir.mkdirs(); if (!file.exists()) file.createNewFile(); OutputStreamWriter osw; if (encryptionIsOn) { Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, "AES"); IvParameterSpec ivParameterSpec = new IvParameterSpec(keyBytes); cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec); FileOutputStream fos = new FileOutputStream(file); CipherOutputStream cos = new CipherOutputStream(fos, cipher); osw = new OutputStreamWriter(cos, "UTF-8"); } else // not encryptionIsOn osw = new FileWriter(file); BufferedWriter out = new BufferedWriter(osw); out.write("This is a test\n"); out.close(); } catch (Exception e) { System.out.println("Encryption Exception "+e); } /////////////////////////////////// try { InputStreamReader isr; if (encryptionIsOn) { Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, "AES"); IvParameterSpec ivParameterSpec = new IvParameterSpec(keyBytes); cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivParameterSpec); FileInputStream fis = new FileInputStream(file); CipherInputStream cis = new CipherInputStream(fis, cipher); isr = new InputStreamReader(cis, "UTF-8"); } else isr = new FileReader(file); BufferedReader in = new BufferedReader(isr); String line = in.readLine(); System.out.println("Text read: <"+line+">"); in.close(); } catch (Exception e) { System.out.println("Decryption Exception "+e); } } private byte[] getKey(String password) throws UnsupportedEncodingException { String key = ""; while (key.length() < 16) key += password; return key.substring(0, 16).getBytes("UTF-8"); } }
Ответ 6
AES шифрование/дешифрование в Android
String encData= encrypt("keykey".getBytes("UTF-16LE"), ("0123000000000215").getBytes("UTF-16LE"));
String decData= decrypt("keykey",Base64.decode(encData.getBytes("UTF-16LE"), Base64.DEFAULT));
функция шифрования
private static String encrypt(byte[] key, byte[] clear) throws Exception
{
MessageDigest md = MessageDigest.getInstance("md5");
byte[] digestOfPassword = md.digest(key);
SecretKeySpec skeySpec = new SecretKeySpec(digestOfPassword, "AES");
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(clear);
return Base64.encodeToString(encrypted,Base64.DEFAULT);
}
функция дешифрования
private static String decrypt(String key, byte[] encrypted) throws Exception
{
MessageDigest md = MessageDigest.getInstance("md5");
byte[] digestOfPassword = md.digest(key.getBytes("UTF-16LE"));
SecretKeySpec skeySpec = new SecretKeySpec(digestOfPassword, "AES");
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] decrypted = cipher.doFinal(encrypted);
return new String(decrypted, "UTF-16LE");
}
AES шифровать/дешифровать в С#
static void Main(string[] args)
{
string enc = encryptAES("0123000000000215", "keykey");
string dec = decryptAES(enc, "keykey");
Console.ReadKey();
}
функция шифрования
public static string encryptAES(string input, string key)
{
var plain = Encoding.Unicode.GetBytes(input);
// 128 bits
AesCryptoServiceProvider provider = new AesCryptoServiceProvider();
provider.KeySize = 128;
provider.Mode = CipherMode.ECB;
provider.Padding = PaddingMode.PKCS7;
provider.Key = CalculateMD5Hash(key);
var enc = provider.CreateEncryptor().TransformFinalBlock(plain, 0, plain.Length);
return Convert.ToBase64String(enc);
}
функция дешифрования
public static string decryptAES(string encryptText, string key)
{
byte[] enc = Convert.FromBase64String(encryptText);
// 128 bits
AesCryptoServiceProvider provider = new AesCryptoServiceProvider();
provider.KeySize = 128;
provider.Mode = CipherMode.ECB;
provider.Padding = PaddingMode.PKCS7;
provider.Key = CalculateMD5Hash(key);
var dec = provider.CreateDecryptor().TransformFinalBlock(enc, 0, enc.Length);
return Encoding.Unicode.GetString(dec);
}
создать MD5
public static byte[] CalculateMD5Hash(string input)
{
MD5 md5 = MD5.Create();
byte[] inputBytes = Encoding.Unicode.GetBytes(input);
return md5.ComputeHash(inputBytes);
}
Ответ 7
Для шифрования/дешифрования AES/CBC/PKCS7 просто скопируйте и вставьте следующий код и замените SecretKey и IV на свои собственные SecretKey и IV.
import java.io.UnsupportedEncodingException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import android.util.Base64;
public class CryptoHandler {
String SecretKey = "xxxxxxxxxxxxxxxxxxxx";
String IV = "xxxxxxxxxxxxxxxx";
private static CryptoHandler instance = null;
public static CryptoHandler getInstance() {
if (instance == null) {
instance = new CryptoHandler();
}
return instance;
}
public String encrypt(String message) throws NoSuchAlgorithmException,
NoSuchPaddingException, IllegalBlockSizeException,
BadPaddingException, InvalidKeyException,
UnsupportedEncodingException, InvalidAlgorithmParameterException {
byte[] srcBuff = message.getBytes("UTF8");
//here using substring because AES takes only 16 or 24 or 32 byte of key
SecretKeySpec skeySpec = new
SecretKeySpec(SecretKey.substring(0,32).getBytes(), "AES");
IvParameterSpec ivSpec = new
IvParameterSpec(IV.substring(0,16).getBytes());
Cipher ecipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
ecipher.init(Cipher.ENCRYPT_MODE, skeySpec, ivSpec);
byte[] dstBuff = ecipher.doFinal(srcBuff);
String base64 = Base64.encodeToString(dstBuff, Base64.DEFAULT);
return base64;
}
public String decrypt(String encrypted) throws NoSuchAlgorithmException,
NoSuchPaddingException, InvalidKeyException,
InvalidAlgorithmParameterException, IllegalBlockSizeException,
BadPaddingException, UnsupportedEncodingException {
SecretKeySpec skeySpec = new
SecretKeySpec(SecretKey.substring(0,32).getBytes(), "AES");
IvParameterSpec ivSpec = new
IvParameterSpec(IV.substring(0,16).getBytes());
Cipher ecipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
ecipher.init(Cipher.DECRYPT_MODE, skeySpec, ivSpec);
byte[] raw = Base64.decode(encrypted, Base64.DEFAULT);
byte[] originalBytes = ecipher.doFinal(raw);
String original = new String(originalBytes, "UTF8");
return original;
}
}
Ответ 8
Простой API для шифрования AES на Android. Это аналог Android для библиотеки AESCrypt Ruby и Obj-C (с теми же настройками по умолчанию):
Ответ 9
Чтобы добавить бодрый замок в проект Android: https://mvnrepository.com/artifact/org.bouncycastle/bcprov-jdk16/1.45
Добавьте эту строку в свою основную деятельность:
static {
Security.addProvider(new BouncyCastleProvider());
}
public class AESHelper {
private static final String TAG = "AESHelper";
public static byte[] encrypt(byte[] data, String initVector, String key) {
try {
IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
Cipher c = Cipher.getInstance("AES/CBC/PKCS5PADDING");
SecretKeySpec k = new SecretKeySpec(Base64.decode(key, Base64.DEFAULT), "AES");
c.init(Cipher.ENCRYPT_MODE, k, iv);
return c.doFinal(data);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static byte[] decrypt(byte[] data, String initVector, String key) {
try {
IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
Cipher c = Cipher.getInstance("AES/CBC/PKCS5PADDING");
SecretKeySpec k = new SecretKeySpec(Base64.decode(key, Base64.DEFAULT), "AES");
c.init(Cipher.DECRYPT_MODE, k, iv);
return c.doFinal(data);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static String keyGenerator() throws NoSuchAlgorithmException {
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
keyGenerator.init(192);
return Base64.encodeToString(keyGenerator.generateKey().getEncoded(),
Base64.DEFAULT);
}
}
Ответ 10
Попробуйте с приведенным ниже кодом это работает для меня.
public static String decrypt(String encrypted) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {
byte[] key = your Key in byte array;
byte[] input = salt in byte array;
SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
IvParameterSpec ivSpec = new IvParameterSpec(input);
Cipher ecipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
ecipher.init(Cipher.DECRYPT_MODE, skeySpec, ivSpec);
byte[] raw = Base64.decode(encrypted, Base64.DEFAULT);
byte[] originalBytes = ecipher.doFinal(raw);
String original = new String(originalBytes, "UTF8");
return original;
}
Ответ 11
Вот простой фрагмент кода, работающий для шифрования и дешифрования AES.
import android.util.Base64;
import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
public class AESEncryptionClass {
private static String INIT_VECTOR_PARAM = "#####";
private static String PASSWORD = "#####";
private static String SALT_KEY = "#####";
private static SecretKeySpec generateAESKey() throws NoSuchAlgorithmException, InvalidKeySpecException {
// Prepare password and salt key.
char[] password = new String(Base64.decode(PASSWORD, Base64.DEFAULT)).toCharArray();
byte[] salt = new String(Base64.decode(SALT_KEY, Base64.DEFAULT)).getBytes(StandardCharsets.UTF_8);
// Create object of [Password Based Encryption Key Specification] with required iteration count and key length.
KeySpec spec = new PBEKeySpec(password, salt, 64, 256);
// Now create AES Key using required hashing algorithm.
SecretKey key = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1").generateSecret(spec);
// Get encoded bytes of secret key.
byte[] bytesSecretKey = key.getEncoded();
// Create specification for AES Key.
SecretKeySpec secretKeySpec = new SecretKeySpec(bytesSecretKey, "AES");
return secretKeySpec;
}
/**
* Call this method to encrypt the readable plain text and get Base64 of encrypted bytes.
*/
public static String encryptMessage(String message) throws BadPaddingException, IllegalBlockSizeException, NoSuchPaddingException, NoSuchAlgorithmException, UnsupportedEncodingException, InvalidKeySpecException, InvalidAlgorithmParameterException, InvalidKeyException {
byte[] initVectorParamBytes = new String(Base64.decode(INIT_VECTOR_PARAM, Base64.DEFAULT)).getBytes(StandardCharsets.UTF_8);
Cipher encryptionCipherBlock = Cipher.getInstance("AES/CBC/PKCS5Padding");
encryptionCipherBlock.init(Cipher.ENCRYPT_MODE, generateAESKey(), new IvParameterSpec(initVectorParamBytes));
byte[] messageBytes = message.getBytes();
byte[] cipherTextBytes = encryptionCipherBlock.doFinal(messageBytes);
String encryptedText = Base64.encodeToString(cipherTextBytes, Base64.DEFAULT);
return encryptedText;
}
/**
* Call this method to decrypt the Base64 of encrypted message and get readable plain text.
*/
public static String decryptMessage(String base64Cipher) throws BadPaddingException, IllegalBlockSizeException, NoSuchPaddingException, NoSuchAlgorithmException, UnsupportedEncodingException, InvalidKeySpecException, InvalidAlgorithmParameterException, InvalidKeyException {
byte[] initVectorParamBytes = new String(Base64.decode(INIT_VECTOR_PARAM, Base64.DEFAULT)).getBytes(StandardCharsets.UTF_8);
Cipher decryptionCipherBlock = Cipher.getInstance("AES/CBC/PKCS5Padding");
decryptionCipherBlock.init(Cipher.DECRYPT_MODE, generateAESKey(), new IvParameterSpec(initVectorParamBytes));
byte[] cipherBytes = Base64.decode(base64Cipher, Base64.DEFAULT);
byte[] messageBytes = decryptionCipherBlock.doFinal(cipherBytes);
String plainText = new String(messageBytes);
return plainText;
}
}
Now, call
encryptMessage()ordecryptMessage()for desiredAESOperation with required parameters.Also, handle the exceptions during
AESoperations.
Надеюсь, это помогло...