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  1. package com.incotalk;
  2.  
  3. import com.facebook.crypto.exception.KeyChainException;
  4. import com.facebook.crypto.keychain.KeyChain;
  5. import com.facebook.crypto.keychain.SecureRandomFix;
  6. import java.security.SecureRandom;
  7. import java.util.Arrays;
  8. import android.content.Context;
  9. import android.content.SharedPreferences;
  10. import android.util.Base64;
  11. import android.util.Log;
  12.  
  13. import com.facebook.crypto.cipher.NativeGCMCipher;
  14. import com.facebook.crypto.mac.NativeMac;
  15.  
  16. /**
  17.  * Created by TheKing on 2014-12-29.
  18.  */
  19. public class CustomSharedPrefsBackedKeyChain implements KeyChain {
  20.     // Visible for testing.
  21.     /* package */ static final String SHARED_PREF_NAME = "crypto";
  22.     /* package */ static final String CIPHER_KEY_PREF = "cipher_key";
  23.     /* package */ static final String MAC_KEY_PREF = "mac_key";
  24.  
  25.     private final SharedPreferences mSharedPreferences;
  26.     private final SecureRandom mSecureRandom;
  27.     private final String key = "2cda8e8ebb37f2b1";
  28.  
  29.     protected byte[] mCipherKey;
  30.     protected boolean mSetCipherKey;
  31.  
  32.     protected byte[] mMacKey;
  33.     protected boolean mSetMacKey;
  34.  
  35.     private static final SecureRandomFix sSecureRandomFix = new SecureRandomFix();
  36.     private String log = "KeyChain";
  37.  
  38.     public CustomSharedPrefsBackedKeyChain(Context context, String key) {
  39.         Log.d(log, "CustomSharedPrefsBackedKeyChain");
  40.         mSharedPreferences = context.getSharedPreferences(SHARED_PREF_NAME, Context.MODE_PRIVATE);
  41.         mSecureRandom = new SecureRandom();
  42.         //this.key = key;
  43.     }
  44.  
  45.     @Override
  46.     public synchronized byte[] getCipherKey() throws KeyChainException {
  47.         if (!mSetCipherKey) {
  48.             mCipherKey = maybeGenerateKey(CIPHER_KEY_PREF, NativeGCMCipher.KEY_LENGTH);
  49.         }
  50.         mSetCipherKey = true;
  51.         return mCipherKey;
  52.     }
  53.  
  54.     @Override
  55.     public byte[] getMacKey() throws KeyChainException {
  56.         if (!mSetMacKey) {
  57.             mMacKey = maybeGenerateKey(MAC_KEY_PREF, NativeMac.KEY_LENGTH);
  58.         }
  59.         mSetMacKey = true;
  60.         return mMacKey;
  61.     }
  62.  
  63.     @Override
  64.     public byte[] getNewIV() throws KeyChainException {
  65.         sSecureRandomFix.tryApplyFixes();
  66.         byte[] iv = new byte[NativeGCMCipher.IV_LENGTH];
  67.         mSecureRandom.nextBytes(iv);
  68.         return iv;
  69.     }
  70.  
  71.     @Override
  72.     public synchronized void destroyKeys() {
  73.         mSetCipherKey = false;
  74.         mSetMacKey = false;
  75.         Arrays.fill(mCipherKey, (byte) 0);
  76.         Arrays.fill(mMacKey, (byte) 0);
  77.         mCipherKey = null;
  78.         mMacKey = null;
  79.         SharedPreferences.Editor editor = mSharedPreferences.edit();
  80.         editor.remove(CIPHER_KEY_PREF);
  81.         editor.remove(MAC_KEY_PREF);
  82.         editor.commit();
  83.     }
  84.  
  85.     /**
  86.      * Generates a key associated with a preference.
  87.      */
  88.     private byte[] maybeGenerateKey(String pref, int length) throws KeyChainException {
  89.         String base64Key = mSharedPreferences.getString(pref, null);
  90.  
  91.         if(length == NativeGCMCipher.KEY_LENGTH)
  92.             base64Key = key;
  93.         else
  94.             base64Key = key + key + key.substring(0, Math.min(key.length(), 16));
  95.  
  96.         if (base64Key == null) {
  97.             // Generate key if it doesn't exist.
  98.             return generateAndSaveKey(pref, length);
  99.         } else {
  100.             return decodeFromPrefs(base64Key);
  101.         }
  102.     }
  103.  
  104.     private byte[] generateAndSaveKey(String pref, int length) throws KeyChainException {
  105.         sSecureRandomFix.tryApplyFixes();
  106.         byte[] key = new byte[length];
  107.         if(length == NativeGCMCipher.KEY_LENGTH)
  108.             key = this.key.getBytes();
  109.         else
  110.             key = (this.key + this.key + this.key +this.key).getBytes();
  111.  
  112.         mSecureRandom.nextBytes(key);
  113.         // Store the session key.
  114.         SharedPreferences.Editor editor = mSharedPreferences.edit();
  115.         editor.putString(
  116.                 pref,
  117.                 encodeForPrefs(key));
  118.         editor.commit();
  119.  
  120.         Log.d(log, key.toString());
  121.  
  122.         return key;
  123.     }
  124.  
  125.     /**
  126.      * Visible for testing.
  127.      */
  128.   byte[] decodeFromPrefs(String keyString) {
  129.         keyString = this.key;
  130.         if (keyString == null) {
  131.             return null;
  132.         }
  133.         Log.d(log, keyString.toString());
  134.         return Base64.decode(keyString, Base64.DEFAULT);
  135.     }
  136.  
  137.     /**
  138.      * Visible for testing.
  139.     */
  140.     String encodeForPrefs(byte[] key) {
  141.         key = (this.key).getBytes();
  142.         if (key == null ) {
  143.                 return null;
  144.         }
  145.         return Base64.encodeToString(key, Base64.DEFAULT);
  146.     }
  147.  
  148.  
  149. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
Main.java:19: error: class CustomSharedPrefsBackedKeyChain is public, should be declared in a file named CustomSharedPrefsBackedKeyChain.java
public class CustomSharedPrefsBackedKeyChain implements KeyChain {
       ^
Main.java:3: error: package com.facebook.crypto.exception does not exist
import com.facebook.crypto.exception.KeyChainException;
                                    ^
Main.java:4: error: package com.facebook.crypto.keychain does not exist
import com.facebook.crypto.keychain.KeyChain;
                                   ^
Main.java:5: error: package com.facebook.crypto.keychain does not exist
import com.facebook.crypto.keychain.SecureRandomFix;
                                   ^
Main.java:8: error: package android.content does not exist
import android.content.Context;
                      ^
Main.java:9: error: package android.content does not exist
import android.content.SharedPreferences;
                      ^
Main.java:10: error: package android.util does not exist
import android.util.Base64;
                   ^
Main.java:11: error: package android.util does not exist
import android.util.Log;
                   ^
Main.java:13: error: package com.facebook.crypto.cipher does not exist
import com.facebook.crypto.cipher.NativeGCMCipher;
                                 ^
Main.java:14: error: package com.facebook.crypto.mac does not exist
import com.facebook.crypto.mac.NativeMac;
                              ^
Main.java:19: error: cannot find symbol
public class CustomSharedPrefsBackedKeyChain implements KeyChain {
                                                        ^
  symbol: class KeyChain
Main.java:25: error: cannot find symbol
    private final SharedPreferences mSharedPreferences;
                  ^
  symbol:   class SharedPreferences
  location: class CustomSharedPrefsBackedKeyChain
Main.java:35: error: cannot find symbol
    private static final SecureRandomFix sSecureRandomFix = new SecureRandomFix();
                         ^
  symbol:   class SecureRandomFix
  location: class CustomSharedPrefsBackedKeyChain
Main.java:38: error: cannot find symbol
    public CustomSharedPrefsBackedKeyChain(Context context, String key) {
                                           ^
  symbol:   class Context
  location: class CustomSharedPrefsBackedKeyChain
Main.java:46: error: cannot find symbol
    public synchronized byte[] getCipherKey() throws KeyChainException {
                                                     ^
  symbol:   class KeyChainException
  location: class CustomSharedPrefsBackedKeyChain
Main.java:55: error: cannot find symbol
    public byte[] getMacKey() throws KeyChainException {
                                     ^
  symbol:   class KeyChainException
  location: class CustomSharedPrefsBackedKeyChain
Main.java:64: error: cannot find symbol
    public byte[] getNewIV() throws KeyChainException {
                                    ^
  symbol:   class KeyChainException
  location: class CustomSharedPrefsBackedKeyChain
Main.java:88: error: cannot find symbol
    private byte[] maybeGenerateKey(String pref, int length) throws KeyChainException {
                                                                    ^
  symbol:   class KeyChainException
  location: class CustomSharedPrefsBackedKeyChain
Main.java:104: error: cannot find symbol
    private byte[] generateAndSaveKey(String pref, int length) throws KeyChainException {
                                                                      ^
  symbol:   class KeyChainException
  location: class CustomSharedPrefsBackedKeyChain
Main.java:35: error: cannot find symbol
    private static final SecureRandomFix sSecureRandomFix = new SecureRandomFix();
                                                                ^
  symbol:   class SecureRandomFix
  location: class CustomSharedPrefsBackedKeyChain
Main.java:39: error: cannot find symbol
        Log.d(log, "CustomSharedPrefsBackedKeyChain");
        ^
  symbol:   variable Log
  location: class CustomSharedPrefsBackedKeyChain
Main.java:40: error: cannot find symbol
        mSharedPreferences = context.getSharedPreferences(SHARED_PREF_NAME, Context.MODE_PRIVATE);
                                                                            ^
  symbol:   variable Context
  location: class CustomSharedPrefsBackedKeyChain
Main.java:48: error: cannot find symbol
            mCipherKey = maybeGenerateKey(CIPHER_KEY_PREF, NativeGCMCipher.KEY_LENGTH);
                                                           ^
  symbol:   variable NativeGCMCipher
  location: class CustomSharedPrefsBackedKeyChain
Main.java:45: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:57: error: cannot find symbol
            mMacKey = maybeGenerateKey(MAC_KEY_PREF, NativeMac.KEY_LENGTH);
                                                     ^
  symbol:   variable NativeMac
  location: class CustomSharedPrefsBackedKeyChain
Main.java:54: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:66: error: cannot find symbol
        byte[] iv = new byte[NativeGCMCipher.IV_LENGTH];
                             ^
  symbol:   variable NativeGCMCipher
  location: class CustomSharedPrefsBackedKeyChain
Main.java:63: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:79: error: package SharedPreferences does not exist
        SharedPreferences.Editor editor = mSharedPreferences.edit();
                         ^
Main.java:71: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:91: error: cannot find symbol
        if(length == NativeGCMCipher.KEY_LENGTH)
                     ^
  symbol:   variable NativeGCMCipher
  location: class CustomSharedPrefsBackedKeyChain
Main.java:107: error: cannot find symbol
        if(length == NativeGCMCipher.KEY_LENGTH)
                     ^
  symbol:   variable NativeGCMCipher
  location: class CustomSharedPrefsBackedKeyChain
Main.java:114: error: package SharedPreferences does not exist
        SharedPreferences.Editor editor = mSharedPreferences.edit();
                         ^
Main.java:120: error: cannot find symbol
        Log.d(log, key.toString());
        ^
  symbol:   variable Log
  location: class CustomSharedPrefsBackedKeyChain
Main.java:133: error: cannot find symbol
        Log.d(log, keyString.toString());
        ^
  symbol:   variable Log
  location: class CustomSharedPrefsBackedKeyChain
Main.java:134: error: cannot find symbol
        return Base64.decode(keyString, Base64.DEFAULT);
                                        ^
  symbol:   variable Base64
  location: class CustomSharedPrefsBackedKeyChain
Main.java:134: error: cannot find symbol
        return Base64.decode(keyString, Base64.DEFAULT);
               ^
  symbol:   variable Base64
  location: class CustomSharedPrefsBackedKeyChain
Main.java:145: error: cannot find symbol
        return Base64.encodeToString(key, Base64.DEFAULT);
                                          ^
  symbol:   variable Base64
  location: class CustomSharedPrefsBackedKeyChain
Main.java:145: error: cannot find symbol
        return Base64.encodeToString(key, Base64.DEFAULT);
               ^
  symbol:   variable Base64
  location: class CustomSharedPrefsBackedKeyChain
39 errors
stdout 
Standard output is empty
https://ideone.com/3Zlgos
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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