Initial commit of Qt Mobile Extras

At this point, contains an unfinished in-app purchase API
with an unfinished Android implementation.

Change-Id: Id01b61f6d588557404a7df0b002b4b6d3cb00f33
Reviewed-by: Andy Nichols <andy.nichols@digia.com>

5 files changed, 1146 insertions, 0 deletions

diff --git a/src/android/src/com/android/vending/billing/IInAppBillingService.aidl b/src/android/src/com/android/vending/billing/IInAppBillingService.aidl
new file mode 100644
index 0000000..2a492f7
--- /dev/null
+++ b/src/android/src/com/android/vending/billing/IInAppBillingService.aidl
@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.vending.billing;
+
+import android.os.Bundle;
+
+/**
+ * InAppBillingService is the service that provides in-app billing version 3 and beyond.
+ * This service provides the following features:
+ * 1. Provides a new API to get details of in-app items published for the app including
+ *    price, type, title and description.
+ * 2. The purchase flow is synchronous and purchase information is available immediately
+ *    after it completes.
+ * 3. Purchase information of in-app purchases is maintained within the Google Play system
+ *    till the purchase is consumed.
+ * 4. An API to consume a purchase of an inapp item. All purchases of one-time
+ *    in-app items are consumable and thereafter can be purchased again.
+ * 5. An API to get current purchases of the user immediately. This will not contain any
+ *    consumed purchases.
+ *
+ * All calls will give a response code with the following possible values
+ * RESULT_OK = 0 - success
+ * RESULT_USER_CANCELED = 1 - user pressed back or canceled a dialog
+ * RESULT_BILLING_UNAVAILABLE = 3 - this billing API version is not supported for the type requested
+ * RESULT_ITEM_UNAVAILABLE = 4 - requested SKU is not available for purchase
+ * RESULT_DEVELOPER_ERROR = 5 - invalid arguments provided to the API
+ * RESULT_ERROR = 6 - Fatal error during the API action
+ * RESULT_ITEM_ALREADY_OWNED = 7 - Failure to purchase since item is already owned
+ * RESULT_ITEM_NOT_OWNED = 8 - Failure to consume since item is not owned
+ */
+interface IInAppBillingService {
+    /**
+     * Checks support for the requested billing API version, package and in-app type.
+     * Minimum API version supported by this interface is 3.
+     * @param apiVersion the billing version which the app is using
+     * @param packageName the package name of the calling app
+     * @param type type of the in-app item being purchased "inapp" for one-time purchases
+     *        and "subs" for subscription.
+     * @return RESULT_OK(0) on success, corresponding result code on failures
+     */
+    int isBillingSupported(int apiVersion, String packageName, String type);
+
+    /**
+     * Provides details of a list of SKUs
+     * Given a list of SKUs of a valid type in the skusBundle, this returns a bundle
+     * with a list JSON strings containing the productId, price, title and description.
+     * This API can be called with a maximum of 20 SKUs.
+     * @param apiVersion billing API version that the Third-party is using
+     * @param packageName the package name of the calling app
+     * @param skusBundle bundle containing a StringArrayList of SKUs with key "ITEM_ID_LIST"
+     * @return Bundle containing the following key-value pairs
+     *         "RESPONSE_CODE" with int value, RESULT_OK(0) if success, other response codes on
+     *              failure as listed above.
+     *         "DETAILS_LIST" with a StringArrayList containing purchase information
+     *              in JSON format similar to:
+     *              '{ "productId" : "exampleSku", "type" : "inapp", "price" : "$5.00",
+     *                 "title : "Example Title", "description" : "This is an example description" }'
+     */
+    Bundle getSkuDetails(int apiVersion, String packageName, String type, in Bundle skusBundle);
+
+    /**
+     * Returns a pending intent to launch the purchase flow for an in-app item by providing a SKU,
+     * the type, a unique purchase token and an optional developer payload.
+     * @param apiVersion billing API version that the app is using
+     * @param packageName package name of the calling app
+     * @param sku the SKU of the in-app item as published in the developer console
+     * @param type the type of the in-app item ("inapp" for one-time purchases
+     *        and "subs" for subscription).
+     * @param developerPayload optional argument to be sent back with the purchase information
+     * @return Bundle containing the following key-value pairs
+     *         "RESPONSE_CODE" with int value, RESULT_OK(0) if success, other response codes on
+     *              failure as listed above.
+     *         "BUY_INTENT" - PendingIntent to start the purchase flow
+     *
+     * The Pending intent should be launched with startIntentSenderForResult. When purchase flow
+     * has completed, the onActivityResult() will give a resultCode of OK or CANCELED.
+     * If the purchase is successful, the result data will contain the following key-value pairs
+     *         "RESPONSE_CODE" with int value, RESULT_OK(0) if success, other response codes on
+     *              failure as listed above.
+     *         "INAPP_PURCHASE_DATA" - String in JSON format similar to
+     *              '{"orderId":"12999763169054705758.1371079406387615",
+     *                "packageName":"com.example.app",
+     *                "productId":"exampleSku",
+     *                "purchaseTime":1345678900000,
+     *                "purchaseToken" : "122333444455555",
+     *                "developerPayload":"example developer payload" }'
+     *         "INAPP_DATA_SIGNATURE" - String containing the signature of the purchase data that
+     *                                  was signed with the private key of the developer
+     *                                  TODO: change this to app-specific keys.
+     */
+    Bundle getBuyIntent(int apiVersion, String packageName, String sku, String type,
+        String developerPayload);
+
+    /**
+     * Returns the current SKUs owned by the user of the type and package name specified along with
+     * purchase information and a signature of the data to be validated.
+     * This will return all SKUs that have been purchased in V3 and managed items purchased using
+     * V1 and V2 that have not been consumed.
+     * @param apiVersion billing API version that the app is using
+     * @param packageName package name of the calling app
+     * @param type the type of the in-app items being requested
+     *        ("inapp" for one-time purchases and "subs" for subscription).
+     * @param continuationToken to be set as null for the first call, if the number of owned
+     *        skus are too many, a continuationToken is returned in the response bundle.
+     *        This method can be called again with the continuation token to get the next set of
+     *        owned skus.
+     * @return Bundle containing the following key-value pairs
+     *         "RESPONSE_CODE" with int value, RESULT_OK(0) if success, other response codes on
+     *              failure as listed above.
+     *         "INAPP_PURCHASE_ITEM_LIST" - StringArrayList containing the list of SKUs
+     *         "INAPP_PURCHASE_DATA_LIST" - StringArrayList containing the purchase information
+     *         "INAPP_DATA_SIGNATURE_LIST"- StringArrayList containing the signatures
+     *                                      of the purchase information
+     *         "INAPP_CONTINUATION_TOKEN" - String containing a continuation token for the
+     *                                      next set of in-app purchases. Only set if the
+     *                                      user has more owned skus than the current list.
+     */
+    Bundle getPurchases(int apiVersion, String packageName, String type, String continuationToken);
+
+    /**
+     * Consume the last purchase of the given SKU. This will result in this item being removed
+     * from all subsequent responses to getPurchases() and allow re-purchase of this item.
+     * @param apiVersion billing API version that the app is using
+     * @param packageName package name of the calling app
+     * @param purchaseToken token in the purchase information JSON that identifies the purchase
+     *        to be consumed
+     * @return 0 if consumption succeeded. Appropriate error values for failures.
+     */
+    int consumePurchase(int apiVersion, String packageName, String purchaseToken);
+}
diff --git a/src/android/src/com/digia/qt5/android/mobileextras/Base64.java b/src/android/src/com/digia/qt5/android/mobileextras/Base64.java
new file mode 100644
index 0000000..2eb71fa
--- /dev/null
+++ b/src/android/src/com/digia/qt5/android/mobileextras/Base64.java
@@ -0,0 +1,571 @@
+// Portions copyright 2002, Google, Inc.
+// Portions copyright (c) 2014 Digia Plc and/or its subsidiary(-ies).
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.digia.qt5.android.mobileextras;
+
+// This code was converted from code at http://iharder.sourceforge.net/base64/
+// Lots of extraneous features were removed.
+/* The original code said:
+ * <p>
+ * I am placing this code in the Public Domain. Do with it as you will.
+ * This software comes with no guarantees or warranties but with
+ * plenty of well-wishing instead!
+ * Please visit
+ * <a href="http://iharder.net/xmlizable">http://iharder.net/xmlizable</a>
+ * periodically to check for updates or to contribute improvements.
+ * </p>
+ *
+ * @author Robert Harder
+ * @author rharder@usa.net
+ * @version 1.3
+ */
+
+/**
+ * Base64 converter class. This code is not a complete MIME encoder;
+ * it simply converts binary data to base64 data and back.
+ *
+ * <p>Note {@link CharBase64} is a GWT-compatible implementation of this
+ * class.
+ */
+public class Base64 {
+    /** Specify encoding (value is {@code true}). */
+    public final static boolean ENCODE = true;
+
+    /** Specify decoding (value is {@code false}). */
+    public final static boolean DECODE = false;
+
+    /** The equals sign (=) as a byte. */
+    private final static byte EQUALS_SIGN = (byte) '=';
+
+    /** The new line character (\n) as a byte. */
+    private final static byte NEW_LINE = (byte) '\n';
+
+    /**
+     * The 64 valid Base64 values.
+     */
+    private final static byte[] ALPHABET =
+        {(byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F',
+        (byte) 'G', (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K',
+        (byte) 'L', (byte) 'M', (byte) 'N', (byte) 'O', (byte) 'P',
+        (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U',
+        (byte) 'V', (byte) 'W', (byte) 'X', (byte) 'Y', (byte) 'Z',
+        (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e',
+        (byte) 'f', (byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j',
+        (byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n', (byte) 'o',
+        (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's', (byte) 't',
+        (byte) 'u', (byte) 'v', (byte) 'w', (byte) 'x', (byte) 'y',
+        (byte) 'z', (byte) '0', (byte) '1', (byte) '2', (byte) '3',
+        (byte) '4', (byte) '5', (byte) '6', (byte) '7', (byte) '8',
+        (byte) '9', (byte) '+', (byte) '/'};
+
+    /**
+     * The 64 valid web safe Base64 values.
+     */
+    private final static byte[] WEBSAFE_ALPHABET =
+        {(byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F',
+        (byte) 'G', (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K',
+        (byte) 'L', (byte) 'M', (byte) 'N', (byte) 'O', (byte) 'P',
+        (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U',
+        (byte) 'V', (byte) 'W', (byte) 'X', (byte) 'Y', (byte) 'Z',
+        (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e',
+        (byte) 'f', (byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j',
+        (byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n', (byte) 'o',
+        (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's', (byte) 't',
+        (byte) 'u', (byte) 'v', (byte) 'w', (byte) 'x', (byte) 'y',
+        (byte) 'z', (byte) '0', (byte) '1', (byte) '2', (byte) '3',
+        (byte) '4', (byte) '5', (byte) '6', (byte) '7', (byte) '8',
+        (byte) '9', (byte) '-', (byte) '_'};
+
+    /**
+     * Translates a Base64 value to either its 6-bit reconstruction value
+     * or a negative number indicating some other meaning.
+     **/
+    private final static byte[] DECODABET = {-9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal  0 -  8
+        -5, -5, // Whitespace: Tab and Linefeed
+        -9, -9, // Decimal 11 - 12
+        -5, // Whitespace: Carriage Return
+        -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 14 - 26
+        -9, -9, -9, -9, -9, // Decimal 27 - 31
+        -5, // Whitespace: Space
+        -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 33 - 42
+        62, // Plus sign at decimal 43
+        -9, -9, -9, // Decimal 44 - 46
+        63, // Slash at decimal 47
+        52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // Numbers zero through nine
+        -9, -9, -9, // Decimal 58 - 60
+        -1, // Equals sign at decimal 61
+        -9, -9, -9, // Decimal 62 - 64
+        0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, // Letters 'A' through 'N'
+        14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // Letters 'O' through 'Z'
+        -9, -9, -9, -9, -9, -9, // Decimal 91 - 96
+        26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, // Letters 'a' through 'm'
+        39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // Letters 'n' through 'z'
+        -9, -9, -9, -9, -9 // Decimal 123 - 127
+        /*  ,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 128 - 139
+        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 140 - 152
+        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 153 - 165
+        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 166 - 178
+        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 179 - 191
+        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 192 - 204
+        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 205 - 217
+        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 218 - 230
+        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 231 - 243
+        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9         // Decimal 244 - 255 */
+    };
+
+    /** The web safe decodabet */
+    private final static byte[] WEBSAFE_DECODABET =
+        {-9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal  0 -  8
+        -5, -5, // Whitespace: Tab and Linefeed
+        -9, -9, // Decimal 11 - 12
+        -5, // Whitespace: Carriage Return
+        -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 14 - 26
+        -9, -9, -9, -9, -9, // Decimal 27 - 31
+        -5, // Whitespace: Space
+        -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 33 - 44
+        62, // Dash '-' sign at decimal 45
+        -9, -9, // Decimal 46-47
+        52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // Numbers zero through nine
+        -9, -9, -9, // Decimal 58 - 60
+        -1, // Equals sign at decimal 61
+        -9, -9, -9, // Decimal 62 - 64
+        0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, // Letters 'A' through 'N'
+        14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // Letters 'O' through 'Z'
+        -9, -9, -9, -9, // Decimal 91-94
+        63, // Underscore '_' at decimal 95
+        -9, // Decimal 96
+        26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, // Letters 'a' through 'm'
+        39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // Letters 'n' through 'z'
+        -9, -9, -9, -9, -9 // Decimal 123 - 127
+        /*  ,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 128 - 139
+        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 140 - 152
+        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 153 - 165
+        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 166 - 178
+        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 179 - 191
+        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 192 - 204
+        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 205 - 217
+        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 218 - 230
+        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 231 - 243
+        -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9         // Decimal 244 - 255 */
+        };
+
+    // Indicates white space in encoding
+    private final static byte WHITE_SPACE_ENC = -5;
+    // Indicates equals sign in encoding
+    private final static byte EQUALS_SIGN_ENC = -1;
+
+    /** Defeats instantiation. */
+    private Base64() {
+    }
+
+    /* ********  E N C O D I N G   M E T H O D S  ******** */
+
+    /**
+     * Encodes up to three bytes of the array <var>source</var>
+     * and writes the resulting four Base64 bytes to <var>destination</var>.
+     * The source and destination arrays can be manipulated
+     * anywhere along their length by specifying
+     * <var>srcOffset</var> and <var>destOffset</var>.
+     * This method does not check to make sure your arrays
+     * are large enough to accommodate <var>srcOffset</var> + 3 for
+     * the <var>source</var> array or <var>destOffset</var> + 4 for
+     * the <var>destination</var> array.
+     * The actual number of significant bytes in your array is
+     * given by <var>numSigBytes</var>.
+     *
+     * @param source the array to convert
+     * @param srcOffset the index where conversion begins
+     * @param numSigBytes the number of significant bytes in your array
+     * @param destination the array to hold the conversion
+     * @param destOffset the index where output will be put
+     * @param alphabet is the encoding alphabet
+     * @return the <var>destination</var> array
+     * @since 1.3
+     */
+    private static byte[] encode3to4(byte[] source, int srcOffset,
+            int numSigBytes, byte[] destination, int destOffset, byte[] alphabet) {
+        //           1         2         3
+        // 01234567890123456789012345678901 Bit position
+        // --------000000001111111122222222 Array position from threeBytes
+        // --------|    ||    ||    ||    | Six bit groups to index alphabet
+        //          >>18  >>12  >> 6  >> 0  Right shift necessary
+        //                0x3f  0x3f  0x3f  Additional AND
+
+        // Create buffer with zero-padding if there are only one or two
+        // significant bytes passed in the array.
+        // We have to shift left 24 in order to flush out the 1's that appear
+        // when Java treats a value as negative that is cast from a byte to an int.
+        int inBuff =
+                (numSigBytes > 0 ? ((source[srcOffset] << 24) >>> 8) : 0)
+                | (numSigBytes > 1 ? ((source[srcOffset + 1] << 24) >>> 16) : 0)
+                | (numSigBytes > 2 ? ((source[srcOffset + 2] << 24) >>> 24) : 0);
+
+        switch (numSigBytes) {
+            case 3:
+                destination[destOffset] = alphabet[(inBuff >>> 18)];
+                destination[destOffset + 1] = alphabet[(inBuff >>> 12) & 0x3f];
+                destination[destOffset + 2] = alphabet[(inBuff >>> 6) & 0x3f];
+                destination[destOffset + 3] = alphabet[(inBuff) & 0x3f];
+                return destination;
+            case 2:
+                destination[destOffset] = alphabet[(inBuff >>> 18)];
+                destination[destOffset + 1] = alphabet[(inBuff >>> 12) & 0x3f];
+                destination[destOffset + 2] = alphabet[(inBuff >>> 6) & 0x3f];
+                destination[destOffset + 3] = EQUALS_SIGN;
+                return destination;
+            case 1:
+                destination[destOffset] = alphabet[(inBuff >>> 18)];
+                destination[destOffset + 1] = alphabet[(inBuff >>> 12) & 0x3f];
+                destination[destOffset + 2] = EQUALS_SIGN;
+                destination[destOffset + 3] = EQUALS_SIGN;
+                return destination;
+            default:
+                return destination;
+        } // end switch
+    } // end encode3to4
+
+    /**
+     * Encodes a byte array into Base64 notation.
+     * Equivalent to calling
+     * {@code encodeBytes(source, 0, source.length)}
+     *
+     * @param source The data to convert
+     * @since 1.4
+     */
+    public static String encode(byte[] source) {
+        return encode(source, 0, source.length, ALPHABET, true);
+    }
+
+    /**
+     * Encodes a byte array into web safe Base64 notation.
+     *
+     * @param source The data to convert
+     * @param doPadding is {@code true} to pad result with '=' chars
+     *        if it does not fall on 3 byte boundaries
+     */
+    public static String encodeWebSafe(byte[] source, boolean doPadding) {
+        return encode(source, 0, source.length, WEBSAFE_ALPHABET, doPadding);
+    }
+
+    /**
+     * Encodes a byte array into Base64 notation.
+     *
+     * @param source the data to convert
+     * @param off offset in array where conversion should begin
+     * @param len length of data to convert
+     * @param alphabet the encoding alphabet
+     * @param doPadding is {@code true} to pad result with '=' chars
+     * if it does not fall on 3 byte boundaries
+     * @since 1.4
+     */
+    public static String encode(byte[] source, int off, int len, byte[] alphabet,
+            boolean doPadding) {
+        byte[] outBuff = encode(source, off, len, alphabet, Integer.MAX_VALUE);
+        int outLen = outBuff.length;
+
+        // If doPadding is false, set length to truncate '='
+        // padding characters
+        while (doPadding == false && outLen > 0) {
+            if (outBuff[outLen - 1] != '=') {
+                break;
+            }
+            outLen -= 1;
+        }
+
+        return new String(outBuff, 0, outLen);
+    }
+
+    /**
+     * Encodes a byte array into Base64 notation.
+     *
+     * @param source the data to convert
+     * @param off offset in array where conversion should begin
+     * @param len length of data to convert
+     * @param alphabet is the encoding alphabet
+     * @param maxLineLength maximum length of one line.
+     * @return the BASE64-encoded byte array
+     */
+    public static byte[] encode(byte[] source, int off, int len, byte[] alphabet,
+            int maxLineLength) {
+        int lenDiv3 = (len + 2) / 3; // ceil(len / 3)
+        int len43 = lenDiv3 * 4;
+        byte[] outBuff = new byte[len43 // Main 4:3
+                                  + (len43 / maxLineLength)]; // New lines
+
+        int d = 0;
+        int e = 0;
+        int len2 = len - 2;
+        int lineLength = 0;
+        for (; d < len2; d += 3, e += 4) {
+
+            // The following block of code is the same as
+            // encode3to4( source, d + off, 3, outBuff, e, alphabet );
+            // but inlined for faster encoding (~20% improvement)
+            int inBuff =
+                    ((source[d + off] << 24) >>> 8)
+                    | ((source[d + 1 + off] << 24) >>> 16)
+                    | ((source[d + 2 + off] << 24) >>> 24);
+            outBuff[e] = alphabet[(inBuff >>> 18)];
+            outBuff[e + 1] = alphabet[(inBuff >>> 12) & 0x3f];
+            outBuff[e + 2] = alphabet[(inBuff >>> 6) & 0x3f];
+            outBuff[e + 3] = alphabet[(inBuff) & 0x3f];
+
+            lineLength += 4;
+            if (lineLength == maxLineLength) {
+                outBuff[e + 4] = NEW_LINE;
+                e++;
+                lineLength = 0;
+            } // end if: end of line
+        } // end for: each piece of array
+
+        if (d < len) {
+            encode3to4(source, d + off, len - d, outBuff, e, alphabet);
+
+            lineLength += 4;
+            if (lineLength == maxLineLength) {
+                // Add a last newline
+                outBuff[e + 4] = NEW_LINE;
+                e++;
+            }
+            e += 4;
+        }
+
+        assert (e == outBuff.length);
+        return outBuff;
+    }
+
+
+    /* ********  D E C O D I N G   M E T H O D S  ******** */
+
+
+    /**
+     * Decodes four bytes from array <var>source</var>
+     * and writes the resulting bytes (up to three of them)
+     * to <var>destination</var>.
+     * The source and destination arrays can be manipulated
+     * anywhere along their length by specifying
+     * <var>srcOffset</var> and <var>destOffset</var>.
+     * This method does not check to make sure your arrays
+     * are large enough to accommodate <var>srcOffset</var> + 4 for
+     * the <var>source</var> array or <var>destOffset</var> + 3 for
+     * the <var>destination</var> array.
+     * This method returns the actual number of bytes that
+     * were converted from the Base64 encoding.
+     *
+     *
+     * @param source the array to convert
+     * @param srcOffset the index where conversion begins
+     * @param destination the array to hold the conversion
+     * @param destOffset the index where output will be put
+     * @param decodabet the decodabet for decoding Base64 content
+     * @return the number of decoded bytes converted
+     * @since 1.3
+     */
+    private static int decode4to3(byte[] source, int srcOffset,
+            byte[] destination, int destOffset, byte[] decodabet) {
+        // Example: Dk==
+        if (source[srcOffset + 2] == EQUALS_SIGN) {
+            int outBuff =
+                    ((decodabet[source[srcOffset]] << 24) >>> 6)
+                    | ((decodabet[source[srcOffset + 1]] << 24) >>> 12);
+
+            destination[destOffset] = (byte) (outBuff >>> 16);
+            return 1;
+        } else if (source[srcOffset + 3] == EQUALS_SIGN) {
+            // Example: DkL=
+            int outBuff =
+                    ((decodabet[source[srcOffset]] << 24) >>> 6)
+                    | ((decodabet[source[srcOffset + 1]] << 24) >>> 12)
+                    | ((decodabet[source[srcOffset + 2]] << 24) >>> 18);
+
+            destination[destOffset] = (byte) (outBuff >>> 16);
+            destination[destOffset + 1] = (byte) (outBuff >>> 8);
+            return 2;
+        } else {
+            // Example: DkLE
+            int outBuff =
+                    ((decodabet[source[srcOffset]] << 24) >>> 6)
+                    | ((decodabet[source[srcOffset + 1]] << 24) >>> 12)
+                    | ((decodabet[source[srcOffset + 2]] << 24) >>> 18)
+                    | ((decodabet[source[srcOffset + 3]] << 24) >>> 24);
+
+            destination[destOffset] = (byte) (outBuff >> 16);
+            destination[destOffset + 1] = (byte) (outBuff >> 8);
+            destination[destOffset + 2] = (byte) (outBuff);
+            return 3;
+        }
+    } // end decodeToBytes
+
+
+    /**
+     * Decodes data from Base64 notation.
+     *
+     * @param s the string to decode (decoded in default encoding)
+     * @return the decoded data
+     * @since 1.4
+     */
+    public static byte[] decode(String s) throws Base64DecoderException {
+        byte[] bytes = s.getBytes();
+        return decode(bytes, 0, bytes.length);
+    }
+
+    /**
+     * Decodes data from web safe Base64 notation.
+     * Web safe encoding uses '-' instead of '+', '_' instead of '/'
+     *
+     * @param s the string to decode (decoded in default encoding)
+     * @return the decoded data
+     */
+    public static byte[] decodeWebSafe(String s) throws Base64DecoderException {
+        byte[] bytes = s.getBytes();
+        return decodeWebSafe(bytes, 0, bytes.length);
+    }
+
+    /**
+     * Decodes Base64 content in byte array format and returns
+     * the decoded byte array.
+     *
+     * @param source The Base64 encoded data
+     * @return decoded data
+     * @since 1.3
+     * @throws Base64DecoderException
+     */
+    public static byte[] decode(byte[] source) throws Base64DecoderException {
+        return decode(source, 0, source.length);
+    }
+
+    /**
+     * Decodes web safe Base64 content in byte array format and returns
+     * the decoded data.
+     * Web safe encoding uses '-' instead of '+', '_' instead of '/'
+     *
+     * @param source the string to decode (decoded in default encoding)
+     * @return the decoded data
+     */
+    public static byte[] decodeWebSafe(byte[] source)
+            throws Base64DecoderException {
+        return decodeWebSafe(source, 0, source.length);
+    }
+
+    /**
+     * Decodes Base64 content in byte array format and returns
+     * the decoded byte array.
+     *
+     * @param source the Base64 encoded data
+     * @param off    the offset of where to begin decoding
+     * @param len    the length of characters to decode
+     * @return decoded data
+     * @since 1.3
+     * @throws Base64DecoderException
+     */
+    public static byte[] decode(byte[] source, int off, int len)
+            throws Base64DecoderException {
+        return decode(source, off, len, DECODABET);
+    }
+
+    /**
+     * Decodes web safe Base64 content in byte array format and returns
+     * the decoded byte array.
+     * Web safe encoding uses '-' instead of '+', '_' instead of '/'
+     *
+     * @param source the Base64 encoded data
+     * @param off    the offset of where to begin decoding
+     * @param len    the length of characters to decode
+     * @return decoded data
+     */
+    public static byte[] decodeWebSafe(byte[] source, int off, int len)
+            throws Base64DecoderException {
+        return decode(source, off, len, WEBSAFE_DECODABET);
+    }
+
+    /**
+     * Decodes Base64 content using the supplied decodabet and returns
+     * the decoded byte array.
+     *
+     * @param source the Base64 encoded data
+     * @param off the offset of where to begin decoding
+     * @param len the length of characters to decode
+     * @param decodabet the decodabet for decoding Base64 content
+     * @return decoded data
+     */
+    public static byte[] decode(byte[] source, int off, int len, byte[] decodabet)
+            throws Base64DecoderException {
+        int len34 = len * 3 / 4;
+        byte[] outBuff = new byte[2 + len34]; // Upper limit on size of output
+        int outBuffPosn = 0;
+
+        byte[] b4 = new byte[4];
+        int b4Posn = 0;
+        int i = 0;
+        byte sbiCrop = 0;
+        byte sbiDecode = 0;
+        for (i = 0; i < len; i++) {
+            sbiCrop = (byte) (source[i + off] & 0x7f); // Only the low seven bits
+            sbiDecode = decodabet[sbiCrop];
+
+            if (sbiDecode >= WHITE_SPACE_ENC) { // White space Equals sign or better
+                if (sbiDecode >= EQUALS_SIGN_ENC) {
+                    // An equals sign (for padding) must not occur at position 0 or 1
+                    // and must be the last byte[s] in the encoded value
+                    if (sbiCrop == EQUALS_SIGN) {
+                        int bytesLeft = len - i;
+                        byte lastByte = (byte) (source[len - 1 + off] & 0x7f);
+                        if (b4Posn == 0 || b4Posn == 1) {
+                            throw new Base64DecoderException(
+                                    "invalid padding byte '=' at byte offset " + i);
+                        } else if ((b4Posn == 3 && bytesLeft > 2)
+                                || (b4Posn == 4 && bytesLeft > 1)) {
+                            throw new Base64DecoderException(
+                                    "padding byte '=' falsely signals end of encoded value "
+                                            + "at offset " + i);
+                        } else if (lastByte != EQUALS_SIGN && lastByte != NEW_LINE) {
+                            throw new Base64DecoderException(
+                                    "encoded value has invalid trailing byte");
+                        }
+                        break;
+                    }
+
+                    b4[b4Posn++] = sbiCrop;
+                    if (b4Posn == 4) {
+                        outBuffPosn += decode4to3(b4, 0, outBuff, outBuffPosn, decodabet);
+                        b4Posn = 0;
+                    }
+                }
+            } else {
+                throw new Base64DecoderException("Bad Base64 input character at " + i
+                        + ": " + source[i + off] + "(decimal)");
+            }
+        }
+
+        // Because web safe encoding allows non padding base64 encodes, we
+        // need to pad the rest of the b4 buffer with equal signs when
+        // b4Posn != 0.  There can be at most 2 equal signs at the end of
+        // four characters, so the b4 buffer must have two or three
+        // characters.  This also catches the case where the input is
+        // padded with EQUALS_SIGN
+        if (b4Posn != 0) {
+            if (b4Posn == 1) {
+                throw new Base64DecoderException("single trailing character at offset "
+                        + (len - 1));
+            }
+            b4[b4Posn++] = EQUALS_SIGN;
+            outBuffPosn += decode4to3(b4, 0, outBuff, outBuffPosn, decodabet);
+        }
+
+        byte[] out = new byte[outBuffPosn];
+        System.arraycopy(outBuff, 0, out, 0, outBuffPosn);
+        return out;
+    }
+}
diff --git a/src/android/src/com/digia/qt5/android/mobileextras/Base64DecoderException.java b/src/android/src/com/digia/qt5/android/mobileextras/Base64DecoderException.java
new file mode 100644
index 0000000..e24eb36
--- /dev/null
+++ b/src/android/src/com/digia/qt5/android/mobileextras/Base64DecoderException.java
@@ -0,0 +1,33 @@
+// Copyright 2002, Google, Inc.
+// Copyright (c) 2014 Digia Plc and/or its subsidiary(-ies).
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.digia.qt5.android.mobileextras;
+
+/**
+ * Exception thrown when encountering an invalid Base64 input character.
+ *
+ * @author nelson
+ */
+public class Base64DecoderException extends Exception {
+    public Base64DecoderException() {
+        super();
+    }
+
+    public Base64DecoderException(String s) {
+        super(s);
+    }
+
+    private static final long serialVersionUID = 1L;
+}
diff --git a/src/android/src/com/digia/qt5/android/mobileextras/QtInAppPurchase.java b/src/android/src/com/digia/qt5/android/mobileextras/QtInAppPurchase.java
new file mode 100644
index 0000000..63fbc7a
--- /dev/null
+++ b/src/android/src/com/digia/qt5/android/mobileextras/QtInAppPurchase.java
@@ -0,0 +1,267 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc
+** All rights reserved.
+** For any questions to Digia, please use contact form at http://qt.digia.com
+**
+** This file is part of the Qt Mobile Extras Add-on.
+**
+** $QT_BEGIN_LICENSE$
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.
+**
+** If you have questions regarding the use of this file, please use
+** contact form at http://qt.digia.com
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+package com.digia.qt5.android.mobileextras;
+
+import java.util.ArrayList;
+import android.app.PendingIntent;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.ServiceConnection;
+import android.content.pm.PackageManager;
+import android.os.RemoteException;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.IBinder;
+import android.util.Log;
+import org.json.JSONObject;
+import org.json.JSONException;
+
+
+import com.android.vending.billing.IInAppBillingService;
+
+public class QtInAppPurchase
+{
+    private Context m_context = null;
+    private IInAppBillingService m_service = null;
+    private String m_publicKey = null;
+    private long m_nativePointer;
+
+    public static final int RESULT_OK = 0;
+    public static final int RESULT_QTMOBILEEXTRAS_ERROR = 9; // No match with any already defined response codes
+    public static final String TAG = "QtInAppPurchase";
+    public static final String TYPE_INAPP = "inapp";
+    public static final int IAP_VERSION = 3;
+
+    private ServiceConnection m_serviceConnection = new ServiceConnection()
+    {
+        @Override
+        public void onServiceConnected(ComponentName name, IBinder service)
+        {
+            m_service = IInAppBillingService.Stub.asInterface(service);
+            try {
+                int response = m_service.isBillingSupported(3, m_context.getPackageName(), TYPE_INAPP);
+                if (response != RESULT_OK) {
+                    Log.e(TAG, "In-app billing not supported");
+                    return;
+                }
+            } catch (RemoteException e) {
+                e.printStackTrace();
+            }
+
+            // Asynchronously populate list of purchased products
+            final Handler handler = new Handler();
+            Thread thread = new Thread(new Runnable()
+            {
+                public void run()
+                {
+                    queryPurchasedProducts();
+                    handler.post(new Runnable()
+                    {
+                        public void run() { purchasedProductsQueried(m_nativePointer); }
+                    });
+                }
+            });
+            thread.start();
+        }
+
+        @Override
+        public void onServiceDisconnected(ComponentName name)
+        {
+            m_service = null;
+        }
+    };
+
+    public QtInAppPurchase(Context context, long nativePointer)
+    {
+        m_context = context;
+        m_nativePointer = nativePointer;
+    }
+
+    public void initializeConnection()
+    {
+
+        Intent serviceIntent = new Intent("com.android.vending.billing.InAppBillingService.BIND");
+        if (!m_context.getPackageManager().queryIntentServices(serviceIntent, 0).isEmpty()) {
+            m_context.bindService(serviceIntent, m_serviceConnection, Context.BIND_AUTO_CREATE);
+        } else {
+            Log.e(TAG, "No in-app billing service available.");
+            purchasedProductsQueried(m_nativePointer);
+        }
+    }
+
+    private int bundleResponseCode(Bundle bundle)
+    {
+        Object o = bundle.get("RESPONSE_CODE");
+        if (o == null) {
+            // Works around known issue where the response code is not bundled.
+            return RESULT_OK;
+        } else if (o instanceof Integer) {
+            return ((Integer)o).intValue();
+        } else if (o instanceof Long) {
+            return (int)((Long)o).longValue();
+        }
+
+        Log.e(TAG, "Unexpected result for response code: " + o);
+        return RESULT_QTMOBILEEXTRAS_ERROR;
+    }
+
+    private void queryPurchasedProducts()
+    {
+        if (m_service == null) {
+            Log.e(TAG, "queryPurchasedProducts: Service not initialized");
+            return;
+        }
+
+        String continuationToken = null;
+        try {
+            do {
+                Bundle ownedItems = m_service.getPurchases(IAP_VERSION,
+                                                           m_context.getPackageName(),
+                                                           TYPE_INAPP,
+                                                           continuationToken);
+                int responseCode = bundleResponseCode(ownedItems);
+                if (responseCode != RESULT_OK) {
+                    Log.e(TAG, "queryPurchasedProducts: Failed to query purchases products");
+                    return;
+                }
+
+                ArrayList<String> dataList = ownedItems.getStringArrayList("INAPP_PURCHASE_DATA_LIST");
+                if (dataList == null) {
+                    Log.e(TAG, "queryPurchasedProducts: No data list in bundle");
+                    return;
+                }
+
+                ArrayList<String> signatureList = ownedItems.getStringArrayList("INAPP_PURCHASE_SIGNATURE_LIST");
+                if (signatureList == null) {
+                    Log.e(TAG, "queryPurchasedProducts: No signature list in bundle");
+                    return;
+                }
+
+                if (dataList.size() != signatureList.size()) {
+                    Log.e(TAG, "queryPurchasedProducts: Mismatching sizes of lists in bundle");
+                    return;
+                }
+
+                for (int i=0; i<dataList.size(); ++i) {
+                    String data = dataList.get(i);
+                    String signature = signatureList.get(i);
+
+                    if (m_publicKey != null && !Security.verifyPurchase(m_publicKey, data, signature)) {
+                        Log.e(TAG, "queryPurchasedProducts: Cannot verify signature of purchase");
+                        return;
+                    } else {
+                        try {
+                            JSONObject jo = new JSONObject(data);
+                            String productId = jo.getString("productId");
+                            int purchaseState = jo.getInt("purchaseState");
+
+                            if (purchaseState == 0)
+                                registerPurchased(m_nativePointer, productId, signature, data);
+                        } catch (JSONException e) {
+                            e.printStackTrace();
+                        }
+                    }
+                }
+
+                continuationToken = ownedItems.getString("INAPP_CONTINUATION_TOKEN");
+
+            } while (continuationToken != null && continuationToken.length() > 0);
+        } catch (RemoteException e) {
+            e.printStackTrace();
+        }
+
+    }
+
+    private void queryDetails(final String productId)
+    {
+        if (m_service == null) {
+            Log.e(TAG, "queryDetails: Service not initialized");
+            queryFailed(m_nativePointer, productId);
+            return;
+        }
+
+        // Asynchronously query details about product
+        Thread thread = new Thread(new Runnable()
+        {
+            public void run()
+            {
+                try {
+                    ArrayList<String> productIds = new ArrayList<String>();
+                    productIds.add(productId);
+                    Bundle productIdBundle = new Bundle();
+                    productIdBundle.putStringArrayList("ITEM_ID_LIST", productIds);
+
+                    Bundle bundle = m_service.getSkuDetails(IAP_VERSION,
+                                                            m_context.getPackageName(),
+                                                            "inapp",
+                                                            productIdBundle);
+                    int responseCode = bundleResponseCode(bundle);
+                    if (responseCode != RESULT_OK) {
+                        Log.e(TAG, "queryDetails: Couldn't retrieve sku details.");
+                        queryFailed(m_nativePointer, productId);
+                        return;
+                    }
+
+                    ArrayList<String> detailsList = bundle.getStringArrayList("DETAILS_LIST");
+                    if (detailsList == null) {
+                        Log.e(TAG, "queryDetails: No details list in response.");
+                        queryFailed(m_nativePointer, productId);
+                        return;
+                    }
+
+                    for (String details : detailsList) {
+                        try {
+                            JSONObject jo = new JSONObject(details);
+                            String queriedProductId = jo.getString("productId");
+                            String queriedPrice = jo.getString("price");
+                            if (queriedProductId == null || queriedPrice == null) {
+                                Log.e(TAG, "Data missing from product details.");
+                            } else if (productId.equals(queriedProductId)) {
+                                registerProduct(m_nativePointer, queriedProductId, queriedPrice);
+                                return;
+                            }
+                        } catch (JSONException e) {
+                            e.printStackTrace();
+                        }
+
+                    }
+
+                    queryFailed(m_nativePointer, productId);
+                } catch (RemoteException e) {
+                    e.printStackTrace();
+                    queryFailed(m_nativePointer, productId);
+                }
+            }
+        });
+        thread.start();
+    }
+
+    public void setPublicKey(String publicKey)
+    {
+        m_publicKey = publicKey;
+    }
+
+    private native static void queryFailed(long nativePointer, String productId);
+    private native static void purchasedProductsQueried(long nativePointer);
+    private native static void registerProduct(long nativePointer, String productId, String price);
+    private native static void registerPurchased(long nativePointer, String productId, String signature, String data);
+}
diff --git a/src/android/src/com/digia/qt5/android/mobileextras/Security.java b/src/android/src/com/digia/qt5/android/mobileextras/Security.java
new file mode 100644
index 0000000..1c56746
--- /dev/null
+++ b/src/android/src/com/digia/qt5/android/mobileextras/Security.java
@@ -0,0 +1,131 @@
+/* Copyright (c) 2012 Google Inc.
+ * Copyright (c) 2014 Digia Plc and/or its subsidiary(-ies).
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.digia.qt5.android.mobileextras;
+
+import android.text.TextUtils;
+import android.util.Log;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+
+import java.security.InvalidKeyException;
+import java.security.KeyFactory;
+import java.security.NoSuchAlgorithmException;
+import java.security.PublicKey;
+import java.security.Signature;
+import java.security.SignatureException;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.X509EncodedKeySpec;
+
+/**
+ * Security-related methods. For a secure implementation, all of this code
+ * should be implemented on a server that communicates with the
+ * application on the device. For the sake of simplicity and clarity of this
+ * example, this code is included here and is executed on the device. If you
+ * must verify the purchases on the phone, you should obfuscate this code to
+ * make it harder for an attacker to replace the code with stubs that treat all
+ * purchases as verified.
+ */
+public class Security {
+    private static final String TAG = "IABUtil/Security";
+
+    private static final String KEY_FACTORY_ALGORITHM = "RSA";
+    private static final String SIGNATURE_ALGORITHM = "SHA1withRSA";
+
+    /**
+     * Verifies that the data was signed with the given signature, and returns
+     * the verified purchase. The data is in JSON format and signed
+     * with a private key. The data also contains the {@link PurchaseState}
+     * and product ID of the purchase.
+     * @param base64PublicKey the base64-encoded public key to use for verifying.
+     * @param signedData the signed JSON string (signed, not encrypted)
+     * @param signature the signature for the data, signed with the private key
+     */
+    public static boolean verifyPurchase(String base64PublicKey, String signedData, String signature) {
+        if (signedData == null) {
+            Log.e(TAG, "data is null");
+            return false;
+        }
+
+        boolean verified = false;
+        if (!TextUtils.isEmpty(signature)) {
+            PublicKey key = Security.generatePublicKey(base64PublicKey);
+            verified = Security.verify(key, signedData, signature);
+            if (!verified) {
+                Log.w(TAG, "signature does not match data.");
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Generates a PublicKey instance from a string containing the
+     * Base64-encoded public key.
+     *
+     * @param encodedPublicKey Base64-encoded public key
+     * @throws IllegalArgumentException if encodedPublicKey is invalid
+     */
+    public static PublicKey generatePublicKey(String encodedPublicKey) {
+        try {
+            byte[] decodedKey = Base64.decode(encodedPublicKey);
+            KeyFactory keyFactory = KeyFactory.getInstance(KEY_FACTORY_ALGORITHM);
+            return keyFactory.generatePublic(new X509EncodedKeySpec(decodedKey));
+        } catch (NoSuchAlgorithmException e) {
+            throw new RuntimeException(e);
+        } catch (InvalidKeySpecException e) {
+            Log.e(TAG, "Invalid key specification.");
+            throw new IllegalArgumentException(e);
+        } catch (Base64DecoderException e) {
+            Log.e(TAG, "Base64 decoding failed.");
+            throw new IllegalArgumentException(e);
+        }
+    }
+
+    /**
+     * Verifies that the signature from the server matches the computed
+     * signature on the data.  Returns true if the data is correctly signed.
+     *
+     * @param publicKey public key associated with the developer account
+     * @param signedData signed data from server
+     * @param signature server signature
+     * @return true if the data and signature match
+     */
+    public static boolean verify(PublicKey publicKey, String signedData, String signature) {
+        Signature sig;
+        try {
+            sig = Signature.getInstance(SIGNATURE_ALGORITHM);
+            sig.initVerify(publicKey);
+            sig.update(signedData.getBytes());
+            if (!sig.verify(Base64.decode(signature))) {
+                Log.e(TAG, "Signature verification failed.");
+                return false;
+            }
+            return true;
+        } catch (NoSuchAlgorithmException e) {
+            Log.e(TAG, "NoSuchAlgorithmException.");
+        } catch (InvalidKeyException e) {
+            Log.e(TAG, "Invalid key specification.");
+        } catch (SignatureException e) {
+            Log.e(TAG, "Signature exception.");
+        } catch (Base64DecoderException e) {
+            Log.e(TAG, "Base64 decoding failed.");
+        }
+        return false;
+    }
+}