Android 使用密码以安全方式对数据进行AES加密
示例
以下示例使用AES加密给定的数据块。加密密钥以安全的方式派生（随机盐，1000轮SHA-256）。加密使用具有随机IV的CBC模式下的AES。
请注意，存储在类数据EncryptedData（salt，iv，和encryptedData）可以被级联以单个字节数组。然后，您可以保存数据或将其传输给收件人。
private static final int SALT_BYTES = 8;
private static final int PBK_ITERATIONS = 1000;
private static final String ENCRYPTION_ALGORITHM = "AES/CBC/PKCS5Padding";
private static final String PBE_ALGORITHM = "PBEwithSHA256and128BITAES-CBC-BC";
private EncryptedData encrypt(String password, byte[] data) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeySpecException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, InvalidAlgorithmParameterException {
EncryptedData encData = new EncryptedData();
SecureRandom rnd = new SecureRandom();
encData.salt= new byte[SALT_BYTES];
encData.iv= new byte[16]; //AES块大小
rnd.nextBytes(encData.salt);
rnd.nextBytes(encData.iv);
PBEKeySpec keySpec = new PBEKeySpec(password.toCharArray(), encData.salt, PBK_ITERATIONS);
SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance(PBE_ALGORITHM);
Key key = secretKeyFactory.generateSecret(keySpec);
Cipher cipher = Cipher.getInstance(ENCRYPTION_ALGORITHM);
IvParameterSpec ivSpec = new IvParameterSpec(encData.iv);
cipher.init(Cipher.ENCRYPT_MODE, key, ivSpec);
encData.encryptedData= cipher.doFinal(data);
return encData;
}
private byte[] decrypt(String password, byte[] salt, byte[] iv, byte[] encryptedData) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, InvalidAlgorithmParameterException {
PBEKeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt, PBK_ITERATIONS);
SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance(PBE_ALGORITHM);
Key key = secretKeyFactory.generateSecret(keySpec);
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
IvParameterSpec ivSpec = new IvParameterSpec(iv);
cipher.init(Cipher.DECRYPT_MODE, key, ivSpec);
return cipher.doFinal(encryptedData);
}
private static class EncryptedData {
public byte[] salt;
public byte[] iv;
public byte[] encryptedData;
}以下示例代码显示了如何测试加密和解密：
try {
String password = "test12345";
byte[] data = "plaintext11223344556677889900".getBytes("UTF-8");
EncryptedData encData = encrypt(password, data);
byte[] decryptedData = decrypt(password, encData.salt, encData.iv, encData.encryptedData);
String decDataAsString = new String(decryptedData, "UTF-8");
Toast.makeText(this, decDataAsString, Toast.LENGTH_LONG).show();
} catch (Exception e) {
e.printStackTrace();
}