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I have the following code. byte[] input = etInput.getText().toString().getBytes(); byte[] keyBytes = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 }; SecretKeySpec key = new SecretKeySpec(keyBytes, "AES"); Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC"); // encryption pass cipher.init(Cipher.ENCRYPT_MODE, key); byte[] cipherText = new byte[cipher.getOutputSize(input.length)]; int ctLength = cipher.update(input, 0, input.length, cipherText, 0); ctLength += cipher.doFinal(cipherText, ctLength); cipher.init(Cipher.DECRYPT_MODE, key); byte[] plainText = new byte[cipher.getOutputSize(ctLength)]; int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0); String strLength = new String(cipherText,"US-ASCII"); byte[] byteCiphterText = strLength.getBytes("US-ASCII"); Log.e("Decrypt", Integer.toString(byteCiphterText.length)); etOutput.setText(new String(cipherText,"US-ASCII")); cipherText = etOutput.getText().toString().getBytes("US-ASCII"); Log.e("Decrypt", Integer.toString(cipherText.length)); ptLength += cipher.doFinal(plainText, ptLength); Log.e("Decrypt", new String(plainText)); Log.e("Decrypt", Integer.toString(ptLength)); It works perfectly. But once I convert it to the class. It always hit the error in this line. ptLength += cipher.doFinal(plainText, ptLength); Error:Pad block corrupted I have checked and both code are exactly the same. Even the value passed in conversion string to byte all is no different from the code above. Any idea what's wrong with the code? public String Encrypt(String strPlainText) throws Exception, NoSuchProviderException, NoSuchPaddingException { byte[] input = strPlainText.getBytes(); byte[] keyBytes =

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