任何人都可以告诉我在我的代码中我做错了什么！我虽然没有收到任何错误。图像文件是加密的，但是当我解密时，我无法查看图像。它仍然显示为加密的。如果我错了，请纠正我。我是这种加密和解密的新手。谢谢。
如果你的投票结果你最好告诉我什么是错的，为什么你这样做呢！
public class MainActivity extends Activity {
Button button1, button2;
String KEY = "MyKey";
SparseArray<byte[]> array = new SparseArray<byte[]>();
SparseArray<byte[]> decryptArray = new SparseArray<byte[]>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
try {
new EncryptAsyncTask().execute();
} catch (Exception e) {
e.printStackTrace();
}
}
});
button2 = (Button) findViewById(R.id.button2);
button2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
try {
new DecryptAsyncTask().execute();
} catch (Exception e) {
e.printStackTrace();
}
}
});
public class EncryptAsyncTask extends AsyncTask<String, String, String>{
ProgressDialog mDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
mDialog = ProgressDialog.show(MainActivity.this, "", "Please wait");
}
@Override
protected String doInBackground(String... params) {
byte[] incrept = null;
try {
getImageFile();
if(array!=null && array.size()>0){
for(int i=0 ; i<array.size() ; i++){
byte[] byteArray = array.get(i);
incrept = encrypt(KEY, byteArray);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(new File(
Environment.getExternalStorageDirectory()+File.separator
+"EncryptedImages"+File.separator+i+"_Image.jpg"));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
fos.write(incrept);
} catch (IOException e1) {
e1.printStackTrace();
}
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if(mDialog.isShowing()){
mDialog.dismiss();
}
}
}
public class DecryptAsyncTask extends AsyncTask<String, String, String>{
ProgressDialog mDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
mDialog = ProgressDialog.show(MainActivity.this, "", "Please wait");
}
@Override
protected String doInBackground(String... params) {
byte[] incrept = null;
try {
getImageFileFromSdCard();
if(decryptArray!=null && decryptArray.size()>0){
for(int i=0 ; i<decryptArray.size() ; i++){
byte[] byteArray = decryptArray.get(i);
incrept = decrypt(KEY, byteArray);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(new File(
Environment.getExternalStorageDirectory()+File.separator
+"DecryptedImages"+File.separator+i+"_Image.jpg"));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
fos.write(incrept);
} catch (IOException e1) {
e1.printStackTrace();
}
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public byte[] getImageFile() throws FileNotFoundException
{
byte[] Image_data = null;
byte[] arry = null;
try {
File file = new File(Environment.getExternalStorageDirectory()+File.separator+"Images"+File.separator);
if(file.exists() && file.isDirectory()){
File[] listOfImages = file.listFiles();
if(listOfImages.length>0){
for(int i=0; i<listOfImages.length; i++){
byte[] inarry = null;
InputStream is = new BufferedInputStream(new FileInputStream(listOfImages[i]));
int length = is.available();
Image_data = new byte[length];
int bytesRead;
ByteArrayOutputStream output = new ByteArrayOutputStream();
while ((bytesRead = is.read(Image_data)) != -1)
{
output.write(Image_data, 0, bytesRead);
}
inarry = output.toByteArray();
array.put(i, inarry);
is.close();
}
}
}
} catch (IOException e) {
e.printStackTrace();
}
return arry;
}
public void getImageFileFromSdCard() throws FileNotFoundException
{
try {
File file = new File(Environment.getExternalStorageDirectory()+File.separator+"EncryptedImages"+File.separator);
if(file.exists() && file.isDirectory()){
File[] listOfFiles = file.listFiles();
if(listOfFiles.length>0){
for(int i=0 ; i<listOfFiles.length ; i++){
FileInputStream fileInputStream = new FileInputStream(listOfFiles[i]);
byte[] bFile = new byte[(int) listOfFiles[i].length()];
fileInputStream.read(bFile);
fileInputStream.close();
decryptArray.put(i, bFile);
}
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
public byte[] encrypt(String seed, byte[] cleartext) throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] result = encrypt(rawKey, cleartext);
return result;
}
public byte[] decrypt(String seed, byte[] encrypted) throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] enc = encrypted;
byte[] result = decrypt(rawKey, enc);
return result;
}
private byte[] getRawKey(byte[] seed) throws Exception {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(seed);
kgen.init(128, sr);
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
return raw;
}
private 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.update(clear);
return encrypted;
}
private 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.update(encrypted);
return decrypted;
}
}
答案 0 :(得分：0)
目前还不清楚你想做什么。 从代码中可以看出，您正在创建一个包含目录中所有文件的字节数组...
您如何加密和解密并将其分解回文件？
丹尼尔
答案 1 :(得分：0)
您正在为加密和解密操作生成两个不同的密钥。你使用相同的种子，但不同的MODE。
AES是对称的，您使用相同的密钥进行解密以加密。