From 79e23531463d2f7e861d7eea33641fed096f77e4 Mon Sep 17 00:00:00 2001
From: "changhyun1.lee" <changhyun1.lee@samsung.com>
Date: Tue, 7 Aug 2012 17:58:21 +0900
Subject: [PATCH] [Title] Added AppIdGenerator [Type] Enhancement [Module]
 [Priority] [CQ#] [Redmine#] 6281 [Problem] [Cause] [Solution] [TestCase]

Change-Id: I6eef87fa668f04f282eccf9ceadba67f037d5a0c
---
 .../src/org/tizen/common/AppIdGenerator.java       | 89 ++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 org.tizen.common/src/org/tizen/common/AppIdGenerator.java

diff --git a/org.tizen.common/src/org/tizen/common/AppIdGenerator.java b/org.tizen.common/src/org/tizen/common/AppIdGenerator.java
new file mode 100644
index 0000000..28aba98
--- /dev/null
+++ b/org.tizen.common/src/org/tizen/common/AppIdGenerator.java
@@ -0,0 +1,89 @@
+/*
+ * Common
+ *
+ * Copyright (c) 2000 - 2011 Samsung Electronics Co., Ltd. All rights reserved.
+ *
+ * Contact:
+ * Changhyun Lee <changhyun1.lee@samsung.com>
+ * Hyeongseok Heo <hyeongseok.heo@samsung.com>
+ * BonYong Lee <bonyong.lee@samsung.com>
+ * Kangho Kim <kh5325.kim@samsung.com>
+ *
+ * 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.
+ *
+ * Contributors:
+ * - S-Core Co., Ltd
+ *
+ */
+package org.tizen.common;
+
+import java.math.BigInteger;
+import java.security.SecureRandom;
+
+import javax.crypto.Cipher;
+import javax.crypto.KeyGenerator;
+import javax.crypto.SecretKey;
+import javax.crypto.spec.SecretKeySpec;
+
+public class AppIdGenerator {
+    final char[] PSEUDO_CHARS = { '0', '1', '2', '3', '4', '5', '6', '7',
+            '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K',
+            'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
+            'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k',
+            'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
+            'y', 'z' };
+
+    final BigInteger PSEUDO_CHAR_SIZE = new BigInteger("62");
+
+    private String convertBytesToAlphaNumeric(byte in[], int size) {
+        BigInteger randomBigInt = new BigInteger(in).abs();
+        StringBuffer out = new StringBuffer(size + 1);
+
+        for (int i = 0; i < size; ++i) {
+            BigInteger[] dividedAndremainder = randomBigInt
+                    .divideAndRemainder(PSEUDO_CHAR_SIZE);
+            randomBigInt = dividedAndremainder[0];
+            out.append(PSEUDO_CHARS[dividedAndremainder[1].intValue()]);
+        }
+
+        String ret = new String(out);
+        return ret;
+    }
+
+    private byte[] generateRandomBytes(int size) throws Exception {
+        SecureRandom random = new SecureRandom();
+        KeyGenerator keyGen = KeyGenerator.getInstance("AES");
+        keyGen.init(128);
+
+        byte[] bytes = new byte[size];
+        random.nextBytes(bytes);
+
+        SecretKey secretkey = keyGen.generateKey();
+        byte[] key = secretkey.getEncoded();
+        SecretKeySpec secretkeySpec = new SecretKeySpec(key, "AES");
+
+        Cipher cipher = Cipher.getInstance("AES");
+        cipher.init(Cipher.ENCRYPT_MODE, secretkeySpec);
+
+        return cipher.doFinal(bytes);
+    }
+
+    public String generate(int size) throws Exception {
+        return convertBytesToAlphaNumeric(generateRandomBytes(size), size);
+    }
+
+    public String generate() throws Exception {
+        return generate(10).toLowerCase();
+    }
+
+}
\ No newline at end of file
-- 
2.7.4