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我正在嘗試編寫加密或解密字符串(主要是數字)的方法。它工作正常的一些文本(EG- '1010000011', '1010000012', '1010000013'),但給出以下爲別人的錯誤(EG- '1010000014', '1010000018'):AES加密/解密:鑑於最後的塊沒有正確填充
javax.crypto.BadPaddingException :鑑於最終塊無法正常 填充
這裏去我的代碼:
public static SecretKey secKey;
private static IvParameterSpec ivspec;
static {
try {
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
KeySpec spec = new PBEKeySpec("i15646dont6321wanna".toCharArray(),
"ahhalkdjfslk3205jlk3m4ljdfa85l".getBytes("UTF-8"), 65536, 256);
SecretKey tmp = factory.generateSecret(spec);
secKey = new SecretKeySpec(tmp.getEncoded(), "AES");
byte[] iv = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
ivspec = new IvParameterSpec(iv);
} catch (NoSuchAlgorithmException | InvalidKeySpecException | UnsupportedEncodingException e) {
e.printStackTrace();
}
}
public static String encryptData(String textToEncrypt) {
byte[] encryptedBytes = null;
String encryptedText = "";
try {
byte[] byteToEncrypt = textToEncrypt.getBytes(Charset.defaultCharset());
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, secKey, ivspec);
encryptedBytes = cipher.doFinal(byteToEncrypt);
encryptedText = new String(encryptedBytes);
} catch (NoSuchAlgorithmException | IllegalBlockSizeException | BadPaddingException
| InvalidKeyException | NoSuchPaddingException | InvalidAlgorithmParameterException e) {
e.printStackTrace();
}
return encryptedText;
}
public static String decryptData(String textToDecrypt) {
byte[] decryptedBytes = null;
String decryptedText = "";
try {
byte[] byteToDecrypt = textToDecrypt.getBytes(Charset.defaultCharset());
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, secKey, ivspec);
decryptedBytes = cipher.doFinal(byteToDecrypt);
decryptedText = new String(decryptedBytes);
} catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException
| IllegalBlockSizeException | BadPaddingException
| InvalidAlgorithmParameterException e) {
e.printStackTrace();
}
return decryptedText;
}
要加密從文件中讀取和寫入加密後的一些其他文件中的字符串。這個加密的文本將不得不稍後解密。我按照以下方式調用這些方法:
String[] lineArray = line.split(" | "); //line is read from a file.
String encryptedText = AESEncryption.encryptData(lineArray[0]);
String decryptedText = AESEncryption.decryptData(encryptedText);
System.out.println("Original Text: " + lineArray[0] + " | Encrypted text: "
+ encryptedText + " | Decrypted again: " + decryptedText);
當在轉換字符串字節數組,如果我用UTF-8或UTF-16,它拋出異常而解密: javax.crypto.IllegalBlockSizeException:帶襯墊的密碼解密時輸入長度必須爲16的倍數 – Amarjeet 2015-03-19 12:41:33