在我的应用程序中使用敏感数据。我在assest文件夹中有我的初始数据库。当我将数据库复制到我需要解密的安装位置时，资产文件夹包含加密数据库。解密数据库时出现以下错误
10-17 16:30:25.878: W/System.err(15231): java.io.IOException: pad block corrupted
10-17 16:30:25.889: W/System.err(15231): at javax.crypto.CipherInputStream.read(CipherInputStream.java:102)
10-17 16:30:25.889: W/System.err(15231): at javax.crypto.CipherInputStream.read(CipherInputStream.java:134)
10-17 16:30:25.898: W/System.err(15231): at java.io.InputStream.read(InputStream.java:163)
10-17 16:30:25.898: W/System.err(15231): at xont.virtusel.v4.controller.syn.DBEncript.ReadEncryptedFile(DBEncript.java:178)
10-17 16:30:25.898: W/System.err(15231): at xont.virtusel.v4.controller.syn.DBEncript.callRead(DBEncript.java:247)
10-17 16:30:25.898: W/System.err(15231): at xont.virtusel.v4.db.DataBaseHelper.extarctDataBase(DataBaseHelper.java:116)
10-17 16:30:25.898: W/System.err(15231): at xont.virtusel.v4.db.DataBaseHelper.copyDataBase(DataBaseHelper.java:104)
10-17 16:30:25.908: W/System.err(15231): at xont.virtusel.v4.db.DataBaseHelper.createDataBase(DataBaseHelper.java:59)
10-17 16:30:25.908: W/System.err(15231): at xont.virtusel.v4.controller.syn.DatabaseSetupActivity$1.onItemClick(DatabaseSetupActivity.java:43)
10-17 16:30:25.908: W/System.err(15231): at android.widget.AdapterView.performItemClick(AdapterView.java:292)
10-17 16:30:25.908: W/System.err(15231): at android.widget.AbsListView.performItemClick(AbsListView.java:1058)
10-17 16:30:25.908: W/System.err(15231): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2514)
10-17 16:30:25.908: W/System.err(15231): at android.widget.AbsListView$1.run(AbsListView.java:3168)
10-17 16:30:25.908: W/System.err(15231): at android.os.Handler.handleCallback(Handler.java:605)
10-17 16:30:25.908: W/System.err(15231): at android.os.Handler.dispatchMessage(Handler.java:92)
10-17 16:30:25.919: W/System.err(15231): at android.os.Looper.loop(Looper.java:137)
10-17 16:30:25.919: W/System.err(15231): at android.app.ActivityThread.main(ActivityThread.java:4340)
10-17 16:30:25.919: W/System.err(15231): at java.lang.reflect.Method.invokeNative(Native Method)
10-17 16:30:25.928: W/System.err(15231): at java.lang.reflect.Method.invoke(Method.java:511)
10-17 16:30:25.928: W/System.err(15231): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
10-17 16:30:25.928: W/System.err(15231): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
10-17 16:30:25.928: W/System.err(15231): at dalvik.system.NativeStart.main(Native Method)
我的代码与URL
相同public class DBEncript {
String mPassword = null;
public final static int SALT_LEN = 8;
byte [] mInitVec = null;
byte [] mSalt = null;
Cipher mEcipher = null;
Cipher mDecipher = null;
private final int KEYLEN_BITS = 128; // see notes below where this is used.
private final int ITERATIONS = 65536;
private final int MAX_FILE_BUF = 1024;
public DBEncript (String password){
mPassword = password;
}
public byte [] getSalt (){
return (mSalt);
}
public byte [] getInitVec (){
return (mInitVec);
}
private void Db (String msg){
System.out.println ("** DBEncript ** " + msg);
}
/**
* @throws NoSuchAlgorithmException
* @throws InvalidKeySpecException
* @throws NoSuchPaddingException
* @throws InvalidParameterSpecException
* @throws IllegalBlockSizeException
* @throws BadPaddingException
* @throws UnsupportedEncodingException
* @throws InvalidKeyException
*/
public void setupEncrypt () throws NoSuchAlgorithmException,
InvalidKeySpecException,
NoSuchPaddingException,
InvalidParameterSpecException,
IllegalBlockSizeException,
BadPaddingException,
UnsupportedEncodingException,
InvalidKeyException {
SecretKeyFactory factory = null;
SecretKey tmp = null;
mSalt = new byte [SALT_LEN];
SecureRandom rnd = new SecureRandom ();
rnd.nextBytes (mSalt);
Db ("generated salt :" + Hex.encodeHex (mSalt));
factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
KeySpec spec = new PBEKeySpec (mPassword.toCharArray (), mSalt, ITERATIONS, KEYLEN_BITS);
tmp = factory.generateSecret (spec);
SecretKey secret = new SecretKeySpec (tmp.getEncoded(), "AES");
mEcipher = Cipher.getInstance ("AES/CBC/PKCS5Padding");
mEcipher.init (Cipher.ENCRYPT_MODE, secret);
AlgorithmParameters params = mEcipher.getParameters ();
mInitVec = params.getParameterSpec (IvParameterSpec.class).getIV();
Db ("mInitVec is :" + Hex.encodeHex (mInitVec));
}
public void setupDecrypt (String initvec, String salt) throws NoSuchAlgorithmException,InvalidKeySpecException,NoSuchPaddingException,
InvalidKeyException,InvalidAlgorithmParameterException,DecoderException{
SecretKeyFactory factory = null;
SecretKey tmp = null;
SecretKey secret = null;
mSalt = Hex.decodeHex (salt.toCharArray ());
Db ("got salt " + Hex.encodeHex (mSalt));
mInitVec = Hex.decodeHex (initvec.toCharArray ());
Db ("got initvector :" + Hex.encodeHex (mInitVec));
factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
KeySpec spec = new PBEKeySpec(mPassword.toCharArray (), mSalt, ITERATIONS, KEYLEN_BITS);
tmp = factory.generateSecret(spec);
secret = new SecretKeySpec(tmp.getEncoded(), "AES");
mDecipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
mDecipher.init(Cipher.DECRYPT_MODE, secret, new IvParameterSpec(mInitVec));
}
public void WriteEncryptedFile (File input, File output) throws IOException, IllegalBlockSizeException,BadPaddingException{
FileInputStream fin;
FileOutputStream fout;
long totalread = 0;
int nread = 0;
byte [] inbuf = new byte [MAX_FILE_BUF];
fout = new FileOutputStream (output);
fin = new FileInputStream (input);
while ((nread = fin.read (inbuf)) > 0 )
{
// Db ("read " + nread + " bytes");
totalread += nread;
byte [] trimbuf = new byte [nread];
for (int i = 0; i < nread; i++)
trimbuf[i] = inbuf[i];
byte [] tmp = mEcipher.update (trimbuf);
if (tmp != null)
fout.write (tmp);
}
byte [] finalbuf = mEcipher.doFinal ();
if (finalbuf != null)
fout.write (finalbuf);
fout.flush();
fin.close();
fout.close();
fout.close ();
Db ("wrote " + totalread + " encrypted bytes");
}
public void ReadEncryptedFile (File input, File output) throws IllegalBlockSizeException,BadPaddingException, IOException{
FileInputStream fin;
FileOutputStream fout;
CipherInputStream cin;
long totalread = 0;
int nread = 0;
byte [] inbuf = new byte [MAX_FILE_BUF];
fout = new FileOutputStream (output);
fin = new FileInputStream (input);
cin = new CipherInputStream (fin, mDecipher);
while ((nread = cin.read (inbuf)) > 0 )
{
//Db ("read " + nread + " bytes");
totalread += nread;
byte [] trimbuf = new byte [nread];
for (int i = 0; i < nread; i++)
trimbuf[i] = inbuf[i];
fout.write (trimbuf);
}
fout.flush();
cin.close();
fin.close ();
fout.close();
}
public void callRead(File input, File output) {
String iv = null;
String salt = null;
DBEncript en = new DBEncript ("123");
try{
en.setupEncrypt ();
iv = new String(Hex.encodeHex(en.getInitVec())).toUpperCase ();
salt = new String(Hex.encodeHex(en.getSalt())).toUpperCase ();
}catch (InvalidKeyException e){
e.printStackTrace();
}catch (NoSuchAlgorithmException e){
e.printStackTrace();
}catch (InvalidKeySpecException e){
e.printStackTrace();
}catch (NoSuchPaddingException e){
e.printStackTrace();
}catch (InvalidParameterSpecException e){
e.printStackTrace();
}catch (IllegalBlockSizeException e){
e.printStackTrace();
}catch (BadPaddingException e){
e.printStackTrace();
}catch (UnsupportedEncodingException e){
e.printStackTrace();
}
/*
* decrypt file
*/
DBEncript dc = new DBEncript ("123");
try{
dc.setupDecrypt (iv, salt);
}catch (InvalidKeyException e){
e.printStackTrace();
}catch (NoSuchAlgorithmException e){
e.printStackTrace();
}catch (InvalidKeySpecException e){
e.printStackTrace();
}catch (NoSuchPaddingException e){
e.printStackTrace();
}catch (InvalidAlgorithmParameterException e){
e.printStackTrace();
}catch (DecoderException e){
e.printStackTrace();
}
try{
dc.ReadEncryptedFile (input, output);
System.out.println ("decryption finished to " + output.getName ());
}catch (IllegalBlockSizeException e){
e.printStackTrace();
}catch (BadPaddingException e){
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}
}
}
修改 这是我的召唤地点：
private void extarctDataBase() throws IOException {
// Open your local db as the input stream
String outFileName = DB_PATH + DB_NAME;
String extFileName = DB_PATH + SEC_NAME;
DBEncript dc = new DBEncript ("xont@123");
File eoutput = new File (extFileName);
File doutput = new File (outFileName);
System.out.println("==START===");
dc.callRead(eoutput, doutput);
System.out.println ("decryption finished to " + doutput.getName ());
}
答案 0 :(得分：1)
更改此
mDecipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
到
mDecipher = Cipher.getInstance("AES/CFB8/NoPadding");
你应该为mEcipher做同样的事。