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我已經掌握了一些用於加密用戶名和密碼的代碼，並且在文件中寫入，但是當我想要恢復這些值時，我沒有得到原始值，我在讀取時遇到了異常爲了這個目的file.My代碼如下如何在android中加密用戶名和密碼
public class Storage
{
private final byte[] salt = {
(byte)0xf5, (byte)0x33, (byte)0x01, (byte)0x2a,
(byte)0xb2, (byte)0xcc, (byte)0xe4, (byte)0x7f
};
private int iterationCount = 100;
public void encryptAndWriteToFile(String host,String user,String pw,boolean flag)
{
String usr=host+","+user+","+pw+","+Boolean.toString(flag);
Cipher cipher = null;
try
{
PBEKeySpec keySpec =new PBEKeySpec(usr.toCharArray());
SecretKeyFactory keyFactory =SecretKeyFactory.getInstance("PBEWithMD5AndDES");
SecretKey secretKey = keyFactory.generateSecret(keySpec);
PBEParameterSpec parameterSpec =new PBEParameterSpec(salt, iterationCount);
cipher = Cipher.getInstance("PBEWithMD5AndDES");
cipher.init(Cipher.ENCRYPT_MODE, secretKey,parameterSpec);
}catch (NoSuchAlgorithmException exception)
{
exception.printStackTrace();
System.exit(1);
}catch (InvalidKeySpecException exception)
{
exception.printStackTrace();
System.exit(1);
}catch (InvalidKeyException exception)
{
exception.printStackTrace();
System.exit(1);
}catch (NoSuchPaddingException exception)
{
exception.printStackTrace();
System.exit(1);
}catch (InvalidAlgorithmParameterException exception)
{
exception.printStackTrace();
System.exit(1);
}
byte[] outputArray = null;
try
{
outputArray = usr.getBytes("ISO-8859-1");
}catch (UnsupportedEncodingException ex)
{
Logger.getLogger(Storage.class.getName()).log(Level.SEVERE, null, ex);
}
File sdCard=Environment.getExternalStorageDirectory();//+"/userData.txt";
String user_credentails=sdCard.getName()+"/userData.txt";
File file = new File(user_credentails);
Log.d(user_credentails, "is input file ");
FileOutputStream fileOutputStream = null;
try
{
fileOutputStream = new FileOutputStream(file);
}catch (IOException exception)
{
exception.printStackTrace();
System.exit(1);
}
CipherOutputStream out =new CipherOutputStream(fileOutputStream, cipher);
try
{
out.write(outputArray);
out.flush();
out.close();
}catch (IOException exception)
{
exception.printStackTrace();
System.exit(1);
}
Vector fileBytes = new Vector();
try
{
FileInputStream in = new FileInputStream(file);
byte contents;
while (in.available() > 0) {
contents = (byte)in.read();
fileBytes.add(new Byte(contents));
}
in.close();
}catch (IOException exception)
{
exception.printStackTrace();
System.exit(1);
}
byte[] encryptedText = new byte[ fileBytes.size() ];
for (int i = 0; i < fileBytes.size(); i++)
{
encryptedText[ i ] =
((Byte) fileBytes.elementAt(i)).byteValue();
}
}
public String[] readFromFileAndDecrypt(boolean state)
{
Vector fileBytes = new Vector();
String pw = "123";
String fileName = "security.txt";
String usr="10.0.2.2"+","+"haider"+","+pw+","+Boolean.toString(state);
Cipher cipher = null;
try
{
PBEKeySpec keySpec =new PBEKeySpec(usr.toCharArray());
SecretKeyFactory keyFactory =SecretKeyFactory.getInstance("PBEWithMD5AndDES");
SecretKey secretKey = keyFactory.generateSecret(keySpec);
PBEParameterSpec parameterSpec =new PBEParameterSpec(salt, iterationCount);
cipher = Cipher.getInstance("PBEWithMD5AndDES");
cipher.init(Cipher.DECRYPT_MODE, secretKey,parameterSpec);
}catch (NoSuchAlgorithmException exception)
{
exception.printStackTrace();
System.exit(1);
}catch (InvalidKeySpecException exception)
{
exception.printStackTrace();
System.exit(1);
}catch (InvalidKeyException exception)
{
exception.printStackTrace();
System.exit(1);
}catch (NoSuchPaddingException exception)
{
exception.printStackTrace();
System.exit(1);
}catch (InvalidAlgorithmParameterException exception)
{
exception.printStackTrace();
System.exit(1);
}
try
{
File sdCard=Environment.getExternalStorageDirectory();
String user_credentails=sdCard.getAbsolutePath()+"/userData.txt";
Log.d(user_credentails, " is file name and path");
File file = new File(user_credentails);
FileInputStream fileInputStream =new FileInputStream(file);
CipherInputStream in =new CipherInputStream(fileInputStream, cipher);
byte contents = (byte) in.read();
Log.d(Byte.toString(contents)," is line");//.out.println("\n"+contents+"\n");
while (contents != -1)
{
fileBytes.add(new Byte(contents));
contents = (byte) in.read();
}
in.close();
}catch (IOException exception)
{
exception.printStackTrace();
System.exit(1);
}
byte[] decryptedText = new byte[ fileBytes.size() ];
for(int i = 0; i < fileBytes.size(); i++)
{
decryptedText[ i ] =((Byte)fileBytes.elementAt(i)).byteValue();
}
Log.d(new String(decryptedText)," is data");
String uUser=new String(decryptedText);
String[] delims=uUser.split(",");
return delims;
}
}