Change-Id: I375a10c9d7ce56df457a998e5cb9d02465865973

src/main/java/com/l2jserver/util/BlowFishKeygen.java

@@ -0,0 +1,67 @@
+/*
+ * This program is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ * 
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * details.
+ * 
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.l2jserver.util;
+
+import java.util.Random;
+
+/**
+ * Blowfish keygen for GameServer client connections
+ * 
+ * @author KenM
+ */
+public class BlowFishKeygen {
+	private static final int CRYPT_KEYS_SIZE = 20;
+	private static final byte[][] CRYPT_KEYS = new byte[CRYPT_KEYS_SIZE][16];
+
+	private static final Random random = new Random();
+
+	static {
+		// init the GS encryption keys on class load
+
+		for (int i = 0; i < CRYPT_KEYS_SIZE; i++) {
+			// randomize the 8 first bytes
+			for (int j = 0; j < CRYPT_KEYS[i].length; j++) {
+				CRYPT_KEYS[i][j] = (byte) random.nextInt(255);
+			}
+
+			// the last 8 bytes are static
+			CRYPT_KEYS[i][8] = (byte) 0xc8;
+			CRYPT_KEYS[i][9] = (byte) 0x27;
+			CRYPT_KEYS[i][10] = (byte) 0x93;
+			CRYPT_KEYS[i][11] = (byte) 0x01;
+			CRYPT_KEYS[i][12] = (byte) 0xa1;
+			CRYPT_KEYS[i][13] = (byte) 0x6c;
+			CRYPT_KEYS[i][14] = (byte) 0x31;
+			CRYPT_KEYS[i][15] = (byte) 0x97;
+		}
+	}
+
+	// block instantiation
+	private BlowFishKeygen() {
+
+	}
+
+	/**
+	 * Returns a key from this keygen pool, the logical ownership is retained by
+	 * this keygen.<BR>
+	 * Thus when getting a key with interests other then read-only a copy must
+	 * be performed.<BR>
+	 * 
+	 * @return A key from this keygen pool.
+	 */
+	public static byte[] getRandomKey() {
+		return CRYPT_KEYS[random.nextInt(CRYPT_KEYS_SIZE)];
+	}
+}