Android Encrypted Databases

The Android development community, as might be expected, is a pretty vibrant community with a lot of great contributors helping people out. Since Android is largely based upon Java, there is a lot of skills reusability between the Java client dev community and the Android Dev community.

As I mentioned before, encryption as a security topic is perhaps the weakest link in that community at this time. Perhaps, but since that phone/tablet could end up in someone else’s hands much more easily than your desktop or even laptop, it is something that needs a lot more attention from business developers.

When I set out to write my first complex app for Android, I determined to report back to you from time-to-time about what needed better explanation or intuitive solutions. Much has been done in the realm of “making it easier”, except for security topics, which still rank pretty low on the priority list. So using encrypted SQLite databases is the topic of this post. If you think it’s taking an inordinate amount of time for me to complete this app, consider that I’m doing it outside of work. This blog was written during work hours, but all of the rest of the work is squeezed into two hours a night on the nights I’m able to dedicate time. Which is far from every night.

For those of you who are not developers, here’s the synopsis so you don’t have to paw through code with us: It’s not well documented, but it’s possible, with some caveats. I wouldn’t use this method for large databases that need indexes over them, but for securing critical data it works just fine. At the end I propose a far better solution that is outside the purview of app developers and would pretty much have to be implemented by the SQLite team.

Okay, only developers left? Good.

In my research, there were very few useful suggestions for designing secure databases. They fall into three categories:

1. Use the NDK to write a variant of SQLite that encrypts at the file level. For most Android developers this isn’t an option, and I’m guessing the SQLite team wouldn’t be thrilled about you mucking about with their database – it serves a lot more apps than yours.

2. Encrypt the entire SD card through the OS and then store the DB there. This one works, but slows the function of the entire tablet/phone down because you’ve now (again) mucked with resources used by other apps. I will caveat that if you can get your users to do this, it is the currently available solution that allows indices over encrypted data.

3. Use one of several early-beta DB encryption tools. I was uncomfortable doing this with production systems. You may feel differently, particularly after some of them have matured.

 

I didn’t like any of these options, so I did what we’ve had to do in the past when a piece of data was so dangerous in the wrong hands it needed encrypting. I wrote an interface to the DB that encrypts and decrypts as data is inserted and removed. In Android the only oddity you won’t find in other Java environments – or you can more easily get around in other Java environments – is filling list boxes from the database. For that I had to write a custom provider that took care of on-the-fly decryption and insertion to the list.

My solution follows. There are a large varieties of ways that you could solve this problem in Java, this one is where I went because

  1. I don’t have a lot of rows for any given table.
  2. The data does not need to be indexed.

If either of these items is untrue for your implementation, you’ll either have to modify this implementation or find an alternate solution.

So first the encryption handler. Note that in this sample, I chose to encode encrypted arrays of bytes as Strings. I do not guarantee this will work for your scenario, and suggest you keep them as arrays of bytes until after decryption. Also note that this sample was built from a working one by obfuscating what the actual source did and making some modifications for simplification of example. It was not tested after the final round of simplification, but should be correct throughout.

package com.company.monitor;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import android.util.Base64;

public class DBEncryptor {
    private static byte[] key;
    private static String cypherType = cypherType;
   
    public DBEncryptor(String localPass) {

        // save the encoded key for future use
        // - note that this keeps it in memory, and is not strictly safe
        key = encode(localPass.getBytes()).getBytes();
        String keyCopy = new String(key);
        while(keyCopy.length() < 16)
            keyCopy = keyCopy + keyCopy;
       
        byte keyA[] = keyCopy.getBytes();
        if(keyA.length > 16)
            key = System.arraycopy(keyA, 0, key, 0, 16);
    }

    public String encode(byte [] s) {
       
        return Base64.encodeToString(s, Base64.URL_SAFE);
    }
   
    public byte[] decode(byte[] s) {
        return Base64.decode(s, Base64.URL_SAFE);
    }


    public byte[] getKey() {
        // return a copy of the key.
        return key.clone();
    }
   
    public String encrypt(String toEncrypt) throws Exception {
       
            //Create your Secret Key Spec, which defines the key transformations
            SecretKeySpec skeySpec = new SecretKeySpec(key, cypherType);     

            //Get the cipher
            Cipher cipher = Cipher.getInstance(cypherType);

            //Initialize the cipher
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec);

            //Encrypt the string into bytes
            byte[ ] encryptedBytes = cipher.doFinal(toEncrypt.getBytes());

            //Convert the encrypted bytes back into a string
            String encrypted = encode(encryptedBytes);

            return encrypted;
    }
   
    public String decrypt(String encryptedText) throws Exception {
       
        // Get the secret key spec
            SecretKeySpec skeySpec = new SecretKeySpec(key, cypherType);
       
            // create an AES Cipher
            Cipher cipher = Cipher.getInstance(cypherType);
       
            // Initialize it for decryption
            cipher.init(Cipher.DECRYPT_MODE, skeySpec);
       
            // Get the decoded bytes
            byte[] toDecrypt = decode(encryptedText.getBytes());
       
            // And finally, do the decryption.
            byte[] clearText = cipher.doFinal(toDecrypt);

            return new String(clearText);
    }
}

So what we are essentially doing is base-64 encoding the string to be encrypted, and then encrypting the base-64 value using standard Java crypto classes. We simply reverse the process to decrypt a string. Note that this class is also useful if you’re storing values in the Properties file and wish them to be encrypted, since it simply operates on strings.

The value you pass in to create the key needs to be something that is unique to the user or tablet. When it comes down to it, this is your password, and should be treated as such (hence why I changed the parameter name to localPass).

For seasoned Java developers, there’s nothing new on Android at this juncture. We’re just encrypting and decrypting data.

Next it does leave the realm of other Java platforms because the database is utilizing SQLite, which is not generally what you’re writing Java to outside of Android. Bear with me while we go over this class.

The SQLite database class follows. Of course this would need heavy modification to work with your database, but the skeleton is here. Note that not all fields have to be encrypted. You can mix and match, no problems at all. That is one of the things I like about this solution, if I need an index for any reason, I can create an unencrypted field of a type other than blob and index on it.

package com.company.monitor;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

public class DBManagernames extends SQLiteOpenHelper {
    public static final String TABLE_NAME = "Map";
    public static final String COLUMN_ID = "_id";
    public static final String COLUMN_LOCAL = "Local";
    public static final String COLUMN_WORLD = "World";
   
   
    private static int indexId = 0;
    private static int indexLocal = 1;
    private static int indexWorld = 2;
   

    private static final String DATABASE_NAME = "Mappings.db";
    private static final int DATABASE_VERSION = 1;

    // SQL statement to create the DB
    private static final String DATABASE_CREATE = "create table "
            + TABLE_NAME + "(" + COLUMN_ID
            + " integer primary key autoincrement, " + COLUMN_LOCAL
            + " BLOB not null, " + COLUMN_WORLD +" BLOB not null);";

    public DBManagernames(Context context, CursorFactory factory) {
        super(context, DATABASE_NAME, factory, DATABASE_VERSION);
       
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(DATABASE_CREATE);


    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        // Yeah, this isn't implemented in production yet either. It's low on the list, but definitely "on the list"

    }

    // Assumes DBEncryptor was used to convert the fields of name before calling insert
    public void insertToDB(DBNameMap name) {
        ContentValues cv = new ContentValues();
       
        cv.put(COLUMN_LOCAL, name.getName().getBytes());
        cv.put(COLUMN_WORLD, name.getOtherName().getBytes());
       
        getWritableDatabase().insert(TABLE_NAME, null, cv);
    }

    // returns the encrypted values to be manipulated with the decryptor.   
    public DBNameMap readFromDB(Integer index) {
       
        SQLiteDatabase db = getReadableDatabase();
        DBNameMap hnm = new DBNameMap();
        Cursor cur = null;
        try {
            cur = db.query(TABLE_NAME, null, "_id='"+index.toString() +"'", null, null, null, COLUMN_ID);
            // cursors connsistently return before the first element. Move to the first.
            cur.moveToFirst();
            byte[] name = cur.getBlob(indexLocal);
            byte [] othername = cur.getBlob(indexWorld);

            hnm = new DBNameMap(new String(name), new String(othername), false);
        } catch(Exception e) {
            System.out.println(e.toString());
            // Do nothing - we want to return the empty host name map.
        }
        return hnm;
       
    }

    // NOTE: This routine assumes "String name" is the encrypted version of the string.   
    public DBNameMap getFromDBByName(String name) {
        SQLiteDatabase db = getReadableDatabase();
        Cursor cur = null;
        String check = null;
        try {
            // Note - the production version of this routine actually uses the "where" field to get the correct
            // element instead of looping the table. This is here for your debugging use.
            cur = db.query(TABLE_NAME, null, null, null, null, null, null);
            for(cur.moveToFirst();(!cur.isLast());cur.moveToNext()) {
                check = new String(cur.getBlob(indexLocal));
                if(check.equals(name))
                        return new DBNameMap(check, new String(cur.getBlob(indexWorld)), false);
               
            }
            if(cur.isLast())
                return new DBNameMap();
       
            return new DBNameMap(cur.getString(indexLocal), cur.getString(indexWorld), false);
        } catch(Exception e) {
            System.out.println(e.toString());
            return new DBNameMap();
        }

    }


    // used by our list adapter - coming next in the blog.
    public Cursor getCursor() {
        try {

            return getReadableDatabase().query(TABLE_NAME, null, null, null, null, null, null);
        } catch(Exception e) {
            System.out.println(e.toString());
            return null;
        }
        }
   
    // This is used in our list adapter for mapping to fields.
    public String[] listColumns() {
        return new String[] {COLUMN_LOCAL};
    }
   
   
}

I am not including the DBNameMap class, as it is a simple container that has two string fields and maps one name to another.

 

Finally, we have the List Provider. Android requires that you populate lists with a provider, and has several base ones to work with. The problem with the SimpleCursorAdapter is that it assumes an unencrypted database, and we just invested a ton of time making the DB encrypted. There are several possible solutions to this problem, and I present the one I chose here. I extended ResourceCursorAdapter and implemented decryption right in the routines, leaving not much to do in the list population section of my activity but to assign the correct adapter.

package com.company.monitor;

import android.content.Context;
import android.database.Cursor;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ResourceCursorAdapter;
import android.widget.TextView;

public class EncryptedNameAdapter extends ResourceCursorAdapter {

    private String pw;
   
    public EncryptedHostNameAdapter(Context context, int layout, Cursor c,
            boolean autoRequery) {
        super(context, layout, c, autoRequery);
    }

    public EncryptedHostNameAdapter(Context context, int layout, Cursor c,
            int flags) {
        super(context, layout, c, flags);
    }

    // This class must know what the encryption key is for the DB before filling the list,
    // so this call must be made before the list is populated. The first call after the constructor works.
    public void setPW(String pww) {
        pw = pww;
    }

   
    @Override
      public View newView(Context context, Cursor cur, ViewGroup parent) {
       LayoutInflater li = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
       return li.inflate(R.layout.my_list_entry, parent, false);
      }
   
    @Override
    public void bindView(View arg0, Context arg1, Cursor arg2) {
        // Get an encryptor/decryptor for our data.
           DBEncryptor enc = new DBEncryptor(pw);

        // Get the TextView we're placing the data into.
           TextView tvLocal = (TextView)arg0.findViewById(R.id.list_entry_name);
        // Get the bytes from the cursor
           byte[] bLocal = arg2.getBlob(arg2.getColumnIndex(DBManagerNames.COLUMN_LOCAL ));
        // Convert bytes to a string
           String local = new String(bSite);

           try {
            // decrypt the string
               local = enc.decrypt(local);
           } catch(Exception e) {
            System.out.println(e.toString());

            // local holds the encrypted version at this point, fix it.

            // We’ll return an empty string for simplicity
            local = new String();  
           }
           tvSite.setText(local);
    }

}

The EncryptedNameAdapter can be set as the source for any listbox just like most examples set an ArrayAdapter as the source. Of course, it helps if you’ve put some data in the database first .

That’s it for this time. There’s a lot more going on with this project, and I’ll present my solution for SSL certificate verification some time in the next couple of weeks, but for now if you need to encrypt some fields of a database, this is one way to get it done. Ping me on any of the social media outlets or here in the comments if you know of a more elegant/less resource intensive solution, always up for learning more.

And please, if you find an error, it was likely introduced in the transition to something I was willing to throw out here publicly, but let me know so others don’t have problems. I’ve done my best not to introduce any, but always get a bit paranoid if I changed it after my last debug session – and I did to simplify and sanitize.

Published Oct 22, 2012
Version 1.0
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Databases","id":"message:274658","revisionNum":1,"repliesCount":0,"author":{"__ref":"User:user:50312"},"depth":0,"hasGivenKudo":false,"helpful":null,"board":{"__ref":"Tkb:board:TechnicalArticles"},"conversation":{"__ref":"Conversation:conversation:274658"},"messagePolicies":{"__typename":"MessagePolicies","canPublishArticleOnEdit":{"__typename":"PolicyResult","failureReason":{"__typename":"FailureReason","message":"error.lithium.policies.forums.policy_can_publish_on_edit_workflow_action.accessDenied","key":"error.lithium.policies.forums.policy_can_publish_on_edit_workflow_action.accessDenied","args":[]}},"canModerateSpamMessage":{"__typename":"PolicyResult","failureReason":{"__typename":"FailureReason","message":"error.lithium.policies.feature.moderation_spam.action.moderate_entity.allowed.accessDenied","key":"error.lithium.policies.feature.moderation_spam.action.moderate_entity.allowed.accessDenied","args":[]}}},"contentWorkflow":{"__typename":"ContentWorkflow","state":"PUBLISH","scheduledPublishTime":null,"scheduledTimezone":null,"userContext":{"__typename":"MessageWorkflowContext","canSubmitForReview":null,"canEdit":false,"canRecall":null,"canSubmitForPublication":null,"canReturnToAuthor":null,"canPublish":null,"canReturnToReview":null,"canSchedule":false},"shortScheduledTimezone":null},"readOnly":false,"editFrozen":false,"moderationData":{"__ref":"ModerationData:moderation_data:274658"},"teaser":"","body":"

The Android development community, as might be expected, is a pretty vibrant community with a lot of great contributors helping people out. Since Android is largely based upon Java, there is a lot of skills reusability between the Java client dev community and the Android Dev community.

\n

As I mentioned before, encryption as a security topic is perhaps the weakest link in that community at this time. Perhaps, but since that phone/tablet could end up in someone else’s hands much more easily than your desktop or even laptop, it is something that needs a lot more attention from business developers.

\n

When I set out to write my first complex app for Android, I determined to report back to you from time-to-time about what needed better explanation or intuitive solutions. Much has been done in the realm of “making it easier”, except for security topics, which still rank pretty low on the priority list. So using encrypted SQLite databases is the topic of this post. If you think it’s taking an inordinate amount of time for me to complete this app, consider that I’m doing it outside of work. This blog was written during work hours, but all of the rest of the work is squeezed into two hours a night on the nights I’m able to dedicate time. Which is far from every night.

\n

For those of you who are not developers, here’s the synopsis so you don’t have to paw through code with us: It’s not well documented, but it’s possible, with some caveats. I wouldn’t use this method for large databases that need indexes over them, but for securing critical data it works just fine. At the end I propose a far better solution that is outside the purview of app developers and would pretty much have to be implemented by the SQLite team.

\n

Okay, only developers left? Good.

\n

In my research, there were very few useful suggestions for designing secure databases. They fall into three categories:

\n

1. Use the NDK to write a variant of SQLite that encrypts at the file level. For most Android developers this isn’t an option, and I’m guessing the SQLite team wouldn’t be thrilled about you mucking about with their database – it serves a lot more apps than yours.

\n

2. Encrypt the entire SD card through the OS and then store the DB there. This one works, but slows the function of the entire tablet/phone down because you’ve now (again) mucked with resources used by other apps. I will caveat that if you can get your users to do this, it is the currently available solution that allows indices over encrypted data.

\n

3. Use one of several early-beta DB encryption tools. I was uncomfortable doing this with production systems. You may feel differently, particularly after some of them have matured.

\n

 

\n

I didn’t like any of these options, so I did what we’ve had to do in the past when a piece of data was so dangerous in the wrong hands it needed encrypting. I wrote an interface to the DB that encrypts and decrypts as data is inserted and removed. In Android the only oddity you won’t find in other Java environments – or you can more easily get around in other Java environments – is filling list boxes from the database. For that I had to write a custom provider that took care of on-the-fly decryption and insertion to the list.

\n

My solution follows. There are a large varieties of ways that you could solve this problem in Java, this one is where I went because

\n
  1. I don’t have a lot of rows for any given table.
  2. The data does not need to be indexed.
\n

If either of these items is untrue for your implementation, you’ll either have to modify this implementation or find an alternate solution.

\n

So first the encryption handler. Note that in this sample, I chose to encode encrypted arrays of bytes as Strings. I do not guarantee this will work for your scenario, and suggest you keep them as arrays of bytes until after decryption. Also note that this sample was built from a working one by obfuscating what the actual source did and making some modifications for simplification of example. It was not tested after the final round of simplification, but should be correct throughout.

\n

package com.company.monitor;

\n

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

\n

import android.util.Base64;

\n

public class DBEncryptor {
    private static byte[] key;
    private static String cypherType = cypherType;
   
    public DBEncryptor(String localPass) {

\n

        // save the encoded key for future use
        // - note that this keeps it in memory, and is not strictly safe
        key = encode(localPass.getBytes()).getBytes();
        String keyCopy = new String(key);
        while(keyCopy.length() < 16)
            keyCopy = keyCopy + keyCopy;
       
        byte keyA[] = keyCopy.getBytes();
        if(keyA.length > 16)
            key = System.arraycopy(keyA, 0, key, 0, 16);
    }

\n

    public String encode(byte [] s) {
       
        return Base64.encodeToString(s, Base64.URL_SAFE);
    }
   
    public byte[] decode(byte[] s) {
        return Base64.decode(s, Base64.URL_SAFE);
    }

\n


    public byte[] getKey() {
        // return a copy of the key.
        return key.clone();
    }
   
    public String encrypt(String toEncrypt) throws Exception {
       
            //Create your Secret Key Spec, which defines the key transformations
            SecretKeySpec skeySpec = new SecretKeySpec(key, cypherType);     

\n

            //Get the cipher
            Cipher cipher = Cipher.getInstance(cypherType);

\n

            //Initialize the cipher
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec);

\n

            //Encrypt the string into bytes
            byte[ ] encryptedBytes = cipher.doFinal(toEncrypt.getBytes());

\n

            //Convert the encrypted bytes back into a string
            String encrypted = encode(encryptedBytes);

\n

            return encrypted;
    }
   
    public String decrypt(String encryptedText) throws Exception {
       
        // Get the secret key spec
            SecretKeySpec skeySpec = new SecretKeySpec(key, cypherType);
       
            // create an AES Cipher
            Cipher cipher = Cipher.getInstance(cypherType);
       
            // Initialize it for decryption
            cipher.init(Cipher.DECRYPT_MODE, skeySpec);
       
            // Get the decoded bytes
            byte[] toDecrypt = decode(encryptedText.getBytes());
       
            // And finally, do the decryption.
            byte[] clearText = cipher.doFinal(toDecrypt);

\n

            return new String(clearText);
    }
}

\n

So what we are essentially doing is base-64 encoding the string to be encrypted, and then encrypting the base-64 value using standard Java crypto classes. We simply reverse the process to decrypt a string. Note that this class is also useful if you’re storing values in the Properties file and wish them to be encrypted, since it simply operates on strings.

\n

The value you pass in to create the key needs to be something that is unique to the user or tablet. When it comes down to it, this is your password, and should be treated as such (hence why I changed the parameter name to localPass).

\n

For seasoned Java developers, there’s nothing new on Android at this juncture. We’re just encrypting and decrypting data.

\n

Next it does leave the realm of other Java platforms because the database is utilizing SQLite, which is not generally what you’re writing Java to outside of Android. Bear with me while we go over this class.

\n

The SQLite database class follows. Of course this would need heavy modification to work with your database, but the skeleton is here. Note that not all fields have to be encrypted. You can mix and match, no problems at all. That is one of the things I like about this solution, if I need an index for any reason, I can create an unencrypted field of a type other than blob and index on it.

\n

package com.company.monitor;

\n

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

\n

public class DBManagernames extends SQLiteOpenHelper {
    public static final String TABLE_NAME = \"Map\";
    public static final String COLUMN_ID = \"_id\";
    public static final String COLUMN_LOCAL = \"Local\";
    public static final String COLUMN_WORLD = \"World\";
   
   
    private static int indexId = 0;
    private static int indexLocal = 1;
    private static int indexWorld = 2;
   

\n

    private static final String DATABASE_NAME = \"Mappings.db\";
    private static final int DATABASE_VERSION = 1;

\n

    // SQL statement to create the DB
    private static final String DATABASE_CREATE = \"create table \"
            + TABLE_NAME + \"(\" + COLUMN_ID
            + \" integer primary key autoincrement, \" + COLUMN_LOCAL
            + \" BLOB not null, \" + COLUMN_WORLD +\" BLOB not null);\";

\n

    public DBManagernames(Context context, CursorFactory factory) {
        super(context, DATABASE_NAME, factory, DATABASE_VERSION);
       
    }

\n

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(DATABASE_CREATE);

\n


    }

\n

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        // Yeah, this isn't implemented in production yet either. It's low on the list, but definitely \"on the list\"

\n

    }

\n

    // Assumes DBEncryptor was used to convert the fields of name before calling insert
    public void insertToDB(DBNameMap name) {
        ContentValues cv = new ContentValues();
       
        cv.put(COLUMN_LOCAL, name.getName().getBytes());
        cv.put(COLUMN_WORLD, name.getOtherName().getBytes());
       
        getWritableDatabase().insert(TABLE_NAME, null, cv);
    }

\n

    // returns the encrypted values to be manipulated with the decryptor.   
    public DBNameMap readFromDB(Integer index) {
       
        SQLiteDatabase db = getReadableDatabase();
        DBNameMap hnm = new DBNameMap();
        Cursor cur = null;
        try {
            cur = db.query(TABLE_NAME, null, \"_id='\"+index.toString() +\"'\", null, null, null, COLUMN_ID);
            // cursors connsistently return before the first element. Move to the first.
            cur.moveToFirst();
            byte[] name = cur.getBlob(indexLocal);
            byte [] othername = cur.getBlob(indexWorld);

\n

            hnm = new DBNameMap(new String(name), new String(othername), false);
        } catch(Exception e) {
            System.out.println(e.toString());
            // Do nothing - we want to return the empty host name map.
        }
        return hnm;
       
    }

\n

    // NOTE: This routine assumes \"String name\" is the encrypted version of the string.   
    public DBNameMap getFromDBByName(String name) {
        SQLiteDatabase db = getReadableDatabase();
        Cursor cur = null;
        String check = null;
        try {
            // Note - the production version of this routine actually uses the \"where\" field to get the correct
            // element instead of looping the table. This is here for your debugging use.
            cur = db.query(TABLE_NAME, null, null, null, null, null, null);
            for(cur.moveToFirst();(!cur.isLast());cur.moveToNext()) {
                check = new String(cur.getBlob(indexLocal));
                if(check.equals(name))
                        return new DBNameMap(check, new String(cur.getBlob(indexWorld)), false);
               
            }
            if(cur.isLast())
                return new DBNameMap();
       
            return new DBNameMap(cur.getString(indexLocal), cur.getString(indexWorld), false);
        } catch(Exception e) {
            System.out.println(e.toString());
            return new DBNameMap();
        }

\n

    }

\n


    // used by our list adapter - coming next in the blog.
    public Cursor getCursor() {
        try {

\n

            return getReadableDatabase().query(TABLE_NAME, null, null, null, null, null, null);
        } catch(Exception e) {
            System.out.println(e.toString());
            return null;
        }
        }
   
    // This is used in our list adapter for mapping to fields.
    public String[] listColumns() {
        return new String[] {COLUMN_LOCAL};
    }
   
   
}

\n

I am not including the DBNameMap class, as it is a simple container that has two string fields and maps one name to another.

\n

 

\n

Finally, we have the List Provider. Android requires that you populate lists with a provider, and has several base ones to work with. The problem with the SimpleCursorAdapter is that it assumes an unencrypted database, and we just invested a ton of time making the DB encrypted. There are several possible solutions to this problem, and I present the one I chose here. I extended ResourceCursorAdapter and implemented decryption right in the routines, leaving not much to do in the list population section of my activity but to assign the correct adapter.

\n

package com.company.monitor;

\n

import android.content.Context;
import android.database.Cursor;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ResourceCursorAdapter;
import android.widget.TextView;

\n

public class EncryptedNameAdapter extends ResourceCursorAdapter {

\n

    private String pw;
   
    public EncryptedHostNameAdapter(Context context, int layout, Cursor c,
            boolean autoRequery) {
        super(context, layout, c, autoRequery);
    }

\n

    public EncryptedHostNameAdapter(Context context, int layout, Cursor c,
            int flags) {
        super(context, layout, c, flags);
    }

\n

    // This class must know what the encryption key is for the DB before filling the list,
    // so this call must be made before the list is populated. The first call after the constructor works.
    public void setPW(String pww) {
        pw = pww;
    }

\n

   
    @Override
      public View newView(Context context, Cursor cur, ViewGroup parent) {
       LayoutInflater li = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
       return li.inflate(R.layout.my_list_entry, parent, false);
      }
   
    @Override
    public void bindView(View arg0, Context arg1, Cursor arg2) {
        // Get an encryptor/decryptor for our data.
           DBEncryptor enc = new DBEncryptor(pw);

\n

        // Get the TextView we're placing the data into.
           TextView tvLocal = (TextView)arg0.findViewById(R.id.list_entry_name);
        // Get the bytes from the cursor
           byte[] bLocal = arg2.getBlob(arg2.getColumnIndex(DBManagerNames.COLUMN_LOCAL ));
        // Convert bytes to a string
           String local = new String(bSite);

\n

           try {
            // decrypt the string
               local = enc.decrypt(local);
           } catch(Exception e) {
            System.out.println(e.toString());

\n

            // local holds the encrypted version at this point, fix it.

\n

            // We’ll return an empty string for simplicity
            local = new String();  
           }
           tvSite.setText(local);
    }

\n

}

\n

The EncryptedNameAdapter can be set as the source for any listbox just like most examples set an ArrayAdapter as the source. Of course, it helps if you’ve put some data in the database first .

\n

That’s it for this time. There’s a lot more going on with this project, and I’ll present my solution for SSL certificate verification some time in the next couple of weeks, but for now if you need to encrypt some fields of a database, this is one way to get it done. Ping me on any of the social media outlets or here in the comments if you know of a more elegant/less resource intensive solution, always up for learning more.

\n

And please, if you find an error, it was likely introduced in the transition to something I was willing to throw out here publicly, but let me know so others don’t have problems. I’ve done my best not to introduce any, but always get a bit paranoid if I changed it after my last debug session – and I did to simplify and sanitize.

","body@stringLength":"27700","rawBody":"

The Android development community, as might be expected, is a pretty vibrant community with a lot of great contributors helping people out. Since Android is largely based upon Java, there is a lot of skills reusability between the Java client dev community and the Android Dev community.

\n

As I mentioned before, encryption as a security topic is perhaps the weakest link in that community at this time. Perhaps, but since that phone/tablet could end up in someone else’s hands much more easily than your desktop or even laptop, it is something that needs a lot more attention from business developers.

\n

When I set out to write my first complex app for Android, I determined to report back to you from time-to-time about what needed better explanation or intuitive solutions. Much has been done in the realm of “making it easier”, except for security topics, which still rank pretty low on the priority list. So using encrypted SQLite databases is the topic of this post. If you think it’s taking an inordinate amount of time for me to complete this app, consider that I’m doing it outside of work. This blog was written during work hours, but all of the rest of the work is squeezed into two hours a night on the nights I’m able to dedicate time. Which is far from every night.

\n

For those of you who are not developers, here’s the synopsis so you don’t have to paw through code with us: It’s not well documented, but it’s possible, with some caveats. I wouldn’t use this method for large databases that need indexes over them, but for securing critical data it works just fine. At the end I propose a far better solution that is outside the purview of app developers and would pretty much have to be implemented by the SQLite team.

\n

Okay, only developers left? Good.

\n

In my research, there were very few useful suggestions for designing secure databases. They fall into three categories:

\n

1. Use the NDK to write a variant of SQLite that encrypts at the file level. For most Android developers this isn’t an option, and I’m guessing the SQLite team wouldn’t be thrilled about you mucking about with their database – it serves a lot more apps than yours.

\n

2. Encrypt the entire SD card through the OS and then store the DB there. This one works, but slows the function of the entire tablet/phone down because you’ve now (again) mucked with resources used by other apps. I will caveat that if you can get your users to do this, it is the currently available solution that allows indices over encrypted data.

\n

3. Use one of several early-beta DB encryption tools. I was uncomfortable doing this with production systems. You may feel differently, particularly after some of them have matured.

\n

 

\n

I didn’t like any of these options, so I did what we’ve had to do in the past when a piece of data was so dangerous in the wrong hands it needed encrypting. I wrote an interface to the DB that encrypts and decrypts as data is inserted and removed. In Android the only oddity you won’t find in other Java environments – or you can more easily get around in other Java environments – is filling list boxes from the database. For that I had to write a custom provider that took care of on-the-fly decryption and insertion to the list.

\n

My solution follows. There are a large varieties of ways that you could solve this problem in Java, this one is where I went because

\n
  1. I don’t have a lot of rows for any given table.
  2. The data does not need to be indexed.
\n

If either of these items is untrue for your implementation, you’ll either have to modify this implementation or find an alternate solution.

\n

So first the encryption handler. Note that in this sample, I chose to encode encrypted arrays of bytes as Strings. I do not guarantee this will work for your scenario, and suggest you keep them as arrays of bytes until after decryption. Also note that this sample was built from a working one by obfuscating what the actual source did and making some modifications for simplification of example. It was not tested after the final round of simplification, but should be correct throughout.

\n

package com.company.monitor;

\n

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

\n

import android.util.Base64;

\n

public class DBEncryptor {
    private static byte[] key;
    private static String cypherType = cypherType;
   
    public DBEncryptor(String localPass) {

\n

        // save the encoded key for future use
        // - note that this keeps it in memory, and is not strictly safe
        key = encode(localPass.getBytes()).getBytes();
        String keyCopy = new String(key);
        while(keyCopy.length() < 16)
            keyCopy = keyCopy + keyCopy;
       
        byte keyA[] = keyCopy.getBytes();
        if(keyA.length > 16)
            key = System.arraycopy(keyA, 0, key, 0, 16);
    }

\n

    public String encode(byte [] s) {
       
        return Base64.encodeToString(s, Base64.URL_SAFE);
    }
   
    public byte[] decode(byte[] s) {
        return Base64.decode(s, Base64.URL_SAFE);
    }

\n


    public byte[] getKey() {
        // return a copy of the key.
        return key.clone();
    }
   
    public String encrypt(String toEncrypt) throws Exception {
       
            //Create your Secret Key Spec, which defines the key transformations
            SecretKeySpec skeySpec = new SecretKeySpec(key, cypherType);     

\n

            //Get the cipher
            Cipher cipher = Cipher.getInstance(cypherType);

\n

            //Initialize the cipher
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec);

\n

            //Encrypt the string into bytes
            byte[ ] encryptedBytes = cipher.doFinal(toEncrypt.getBytes());

\n

            //Convert the encrypted bytes back into a string
            String encrypted = encode(encryptedBytes);

\n

            return encrypted;
    }
   
    public String decrypt(String encryptedText) throws Exception {
       
        // Get the secret key spec
            SecretKeySpec skeySpec = new SecretKeySpec(key, cypherType);
       
            // create an AES Cipher
            Cipher cipher = Cipher.getInstance(cypherType);
       
            // Initialize it for decryption
            cipher.init(Cipher.DECRYPT_MODE, skeySpec);
       
            // Get the decoded bytes
            byte[] toDecrypt = decode(encryptedText.getBytes());
       
            // And finally, do the decryption.
            byte[] clearText = cipher.doFinal(toDecrypt);

\n

            return new String(clearText);
    }
}

\n

So what we are essentially doing is base-64 encoding the string to be encrypted, and then encrypting the base-64 value using standard Java crypto classes. We simply reverse the process to decrypt a string. Note that this class is also useful if you’re storing values in the Properties file and wish them to be encrypted, since it simply operates on strings.

\n

The value you pass in to create the key needs to be something that is unique to the user or tablet. When it comes down to it, this is your password, and should be treated as such (hence why I changed the parameter name to localPass).

\n

For seasoned Java developers, there’s nothing new on Android at this juncture. We’re just encrypting and decrypting data.

\n

Next it does leave the realm of other Java platforms because the database is utilizing SQLite, which is not generally what you’re writing Java to outside of Android. Bear with me while we go over this class.

\n

The SQLite database class follows. Of course this would need heavy modification to work with your database, but the skeleton is here. Note that not all fields have to be encrypted. You can mix and match, no problems at all. That is one of the things I like about this solution, if I need an index for any reason, I can create an unencrypted field of a type other than blob and index on it.

\n

package com.company.monitor;

\n

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

\n

public class DBManagernames extends SQLiteOpenHelper {
    public static final String TABLE_NAME = \"Map\";
    public static final String COLUMN_ID = \"_id\";
    public static final String COLUMN_LOCAL = \"Local\";
    public static final String COLUMN_WORLD = \"World\";
   
   
    private static int indexId = 0;
    private static int indexLocal = 1;
    private static int indexWorld = 2;
   

\n

    private static final String DATABASE_NAME = \"Mappings.db\";
    private static final int DATABASE_VERSION = 1;

\n

    // SQL statement to create the DB
    private static final String DATABASE_CREATE = \"create table \"
            + TABLE_NAME + \"(\" + COLUMN_ID
            + \" integer primary key autoincrement, \" + COLUMN_LOCAL
            + \" BLOB not null, \" + COLUMN_WORLD +\" BLOB not null);\";

\n

    public DBManagernames(Context context, CursorFactory factory) {
        super(context, DATABASE_NAME, factory, DATABASE_VERSION);
       
    }

\n

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(DATABASE_CREATE);

\n


    }

\n

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        // Yeah, this isn't implemented in production yet either. It's low on the list, but definitely \"on the list\"

\n

    }

\n

    // Assumes DBEncryptor was used to convert the fields of name before calling insert
    public void insertToDB(DBNameMap name) {
        ContentValues cv = new ContentValues();
       
        cv.put(COLUMN_LOCAL, name.getName().getBytes());
        cv.put(COLUMN_WORLD, name.getOtherName().getBytes());
       
        getWritableDatabase().insert(TABLE_NAME, null, cv);
    }

\n

    // returns the encrypted values to be manipulated with the decryptor.   
    public DBNameMap readFromDB(Integer index) {
       
        SQLiteDatabase db = getReadableDatabase();
        DBNameMap hnm = new DBNameMap();
        Cursor cur = null;
        try {
            cur = db.query(TABLE_NAME, null, \"_id='\"+index.toString() +\"'\", null, null, null, COLUMN_ID);
            // cursors connsistently return before the first element. Move to the first.
            cur.moveToFirst();
            byte[] name = cur.getBlob(indexLocal);
            byte [] othername = cur.getBlob(indexWorld);

\n

            hnm = new DBNameMap(new String(name), new String(othername), false);
        } catch(Exception e) {
            System.out.println(e.toString());
            // Do nothing - we want to return the empty host name map.
        }
        return hnm;
       
    }

\n

    // NOTE: This routine assumes \"String name\" is the encrypted version of the string.   
    public DBNameMap getFromDBByName(String name) {
        SQLiteDatabase db = getReadableDatabase();
        Cursor cur = null;
        String check = null;
        try {
            // Note - the production version of this routine actually uses the \"where\" field to get the correct
            // element instead of looping the table. This is here for your debugging use.
            cur = db.query(TABLE_NAME, null, null, null, null, null, null);
            for(cur.moveToFirst();(!cur.isLast());cur.moveToNext()) {
                check = new String(cur.getBlob(indexLocal));
                if(check.equals(name))
                        return new DBNameMap(check, new String(cur.getBlob(indexWorld)), false);
               
            }
            if(cur.isLast())
                return new DBNameMap();
       
            return new DBNameMap(cur.getString(indexLocal), cur.getString(indexWorld), false);
        } catch(Exception e) {
            System.out.println(e.toString());
            return new DBNameMap();
        }

\n

    }

\n


    // used by our list adapter - coming next in the blog.
    public Cursor getCursor() {
        try {

\n

            return getReadableDatabase().query(TABLE_NAME, null, null, null, null, null, null);
        } catch(Exception e) {
            System.out.println(e.toString());
            return null;
        }
        }
   
    // This is used in our list adapter for mapping to fields.
    public String[] listColumns() {
        return new String[] {COLUMN_LOCAL};
    }
   
   
}

\n

I am not including the DBNameMap class, as it is a simple container that has two string fields and maps one name to another.

\n

 

\n

Finally, we have the List Provider. Android requires that you populate lists with a provider, and has several base ones to work with. The problem with the SimpleCursorAdapter is that it assumes an unencrypted database, and we just invested a ton of time making the DB encrypted. There are several possible solutions to this problem, and I present the one I chose here. I extended ResourceCursorAdapter and implemented decryption right in the routines, leaving not much to do in the list population section of my activity but to assign the correct adapter.

\n

package com.company.monitor;

\n

import android.content.Context;
import android.database.Cursor;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ResourceCursorAdapter;
import android.widget.TextView;

\n

public class EncryptedNameAdapter extends ResourceCursorAdapter {

\n

    private String pw;
   
    public EncryptedHostNameAdapter(Context context, int layout, Cursor c,
            boolean autoRequery) {
        super(context, layout, c, autoRequery);
    }

\n

    public EncryptedHostNameAdapter(Context context, int layout, Cursor c,
            int flags) {
        super(context, layout, c, flags);
    }

\n

    // This class must know what the encryption key is for the DB before filling the list,
    // so this call must be made before the list is populated. The first call after the constructor works.
    public void setPW(String pww) {
        pw = pww;
    }

\n

   
    @Override
      public View newView(Context context, Cursor cur, ViewGroup parent) {
       LayoutInflater li = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
       return li.inflate(R.layout.my_list_entry, parent, false);
      }
   
    @Override
    public void bindView(View arg0, Context arg1, Cursor arg2) {
        // Get an encryptor/decryptor for our data.
           DBEncryptor enc = new DBEncryptor(pw);

\n

        // Get the TextView we're placing the data into.
           TextView tvLocal = (TextView)arg0.findViewById(R.id.list_entry_name);
        // Get the bytes from the cursor
           byte[] bLocal = arg2.getBlob(arg2.getColumnIndex(DBManagerNames.COLUMN_LOCAL ));
        // Convert bytes to a string
           String local = new String(bSite);

\n

           try {
            // decrypt the string
               local = enc.decrypt(local);
           } catch(Exception e) {
            System.out.println(e.toString());

\n

            // local holds the encrypted version at this point, fix it.

\n

            // We’ll return an empty string for simplicity
            local = new String();  
           }
           tvSite.setText(local);
    }

\n

}

\n

The EncryptedNameAdapter can be set as the source for any listbox just like most examples set an ArrayAdapter as the source. Of course, it helps if you’ve put some data in the database first .

\n

That’s it for this time. There’s a lot more going on with this project, and I’ll present my solution for SSL certificate verification some time in the next couple of weeks, but for now if you need to encrypt some fields of a database, this is one way to get it done. Ping me on any of the social media outlets or here in the comments if you know of a more elegant/less resource intensive solution, always up for learning more.

\n

And please, if you find an error, it was likely introduced in the transition to something I was willing to throw out here publicly, but let me know so others don’t have problems. I’ve done my best not to introduce any, but always get a bit paranoid if I changed it after my last debug session – and I did to simplify and sanitize.

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