我已经编写了一些用于加密用户名和密码的代码并写在一个文件中，但是当我想恢复这些值时，我没有得到原始值，我在读取文件时遇到异常。我为此目的的代码如下
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;
}
}