使用AES算法进行加密和解密

我正在为我的应用程序制作加密/解密模块。 我按照本教程

它没有给出任何错误，也没有显示输出。

日志文件

07-23 07:29:06.480: W/System.err(795): javax.crypto.BadPaddingException: pad block corrupted 07-23 07:29:06.629: W/System.err(795): at com.android.org.bouncycastle.jcajce.provider.symmetric.util.BaseBlockCipher.engineDoFinal(BaseBlockCipher.java:710) 07-23 07:29:06.629: W/System.err(795): at javax.crypto.Cipher.doFinal(Cipher.java:1111) 07-23 07:29:06.660: W/System.err(795): at com.example.generatesha384.AESHelper.decrypt(AESHelper.java:52) 07-23 07:29:06.690: W/System.err(795): at com.example.generatesha384.AESHelper.decrypt(AESHelper.java:25) 07-23 07:29:06.690: W/System.err(795): at com.example.generatesha384.MainActivity.onCreate(MainActivity.java:24) 07-23 07:29:06.700: W/System.err(795): at android.app.Activity.performCreate(Activity.java:5133) 07-23 07:29:06.730: W/System.err(795): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 07-23 07:29:06.730: W/System.err(795): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175) 07-23 07:29:06.770: W/System.err(795): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 07-23 07:29:06.770: W/System.err(795): at android.app.ActivityThread.access$600(ActivityThread.java:141) 07-23 07:29:06.770: W/System.err(795): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 07-23 07:29:06.800: W/System.err(795): at android.os.Handler.dispatchMessage(Handler.java:99) 07-23 07:29:06.800: W/System.err(795): at android.os.Looper.loop(Looper.java:137) 07-23 07:29:06.840: W/System.err(795): at android.app.ActivityThread.main(ActivityThread.java:5103) 07-23 07:29:06.840: W/System.err(795): at java.lang.reflect.Method.invokeNative(Native Method) 07-23 07:29:06.872: W/System.err(795): at java.lang.reflect.Method.invoke(Method.java:525) 07-23 07:29:06.880: W/System.err(795): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 07-23 07:29:06.910: W/System.err(795): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 07-23 07:29:06.910: W/System.err(795): at dalvik.system.NativeStart.main(Native Method) 

MainActivity.Java

 String seedValue = "This Is MySecure"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); TextView text = (TextView)findViewById(R.id.result); String normalText = "VIJAY"; String normalTextEnc; try { normalTextEnc = AESHelper.encrypt(seedValue, normalText); String normalTextDec = AESHelper.decrypt(seedValue, normalTextEnc); String textResult = "Normal Text ::" + normalText + " \n Encrypted Value :: " + normalTextEnc + " \n Decrypted value :: " + normalTextDec; text.setText(textResult); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } 

AESHelper.Java

 public class AESHelper { public static String encrypt(String seed, String cleartext) throws Exception { byte[] rawKey = getRawKey(seed.getBytes("UTF-8")); byte[] result = encrypt(rawKey, cleartext.getBytes("UTF-8")); return toHex(result); } public static String decrypt(String seed, String encrypted) throws Exception { byte[] rawKey = getRawKey(seed.getBytes("UTF-8")); byte[] enc = toByte(encrypted); byte[] result = decrypt(rawKey, enc); return new String(result); } private static byte[] getRawKey(byte[] seed) throws Exception { KeyGenerator kgen = KeyGenerator.getInstance("AES"); SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); sr.setSeed(seed); kgen.init(128, sr); // 192 and 256 bits may not be available SecretKey skey = kgen.generateKey(); byte[] raw = skey.getEncoded(); return raw; } 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); Log.d("DEC", "Decrypted: " + decrypted); return decrypted; } public static String toHex(String txt) { return toHex(txt.getBytes()); } public static String fromHex(String hex) { return new String(toByte(hex)); } public static byte[] toByte(String hexString) { int len = hexString.length() / 2; byte[] result = new byte[len]; for (int i = 0; i < len; i++) result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2), 16).byteValue(); return result; } public static String toHex(byte[] buf) { if (buf == null) return ""; StringBuffer result = new StringBuffer(2 * buf.length); for (int i = 0; i > 4) & 0x0f)).append(HEX.charAt(b & 0x0f)); } 

}

AESHelper.java:52

  byte[] decrypted = cipher.doFinal(encrypted); 

和AESHelper.java:25

  byte[] result = decrypt(rawKey, enc); 

Answer 1

在花了很多时间研究Java中的AES加密/解密之后，我将以下文章放在我在StackOverflow上阅读的所有信息中 – http://netnix.org/2015/04/19/aes-encryption-with- HMAC-诚信在的Java /

也许它有所帮助，也许它没有。