| Код | /* * 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 net.sf.l2j.loginserver.crypt;
import java.math.BigInteger; import java.security.KeyPair; import java.security.interfaces.RSAPublicKey;
import org.apache.log4j.Logger;
/** * */ public class ScrambledKeyPair { private static Logger _log = Logger.getLogger(ScrambledKeyPair.class .getName()); public KeyPair _pair; public byte[] _scrambledModulus;
public ScrambledKeyPair(final KeyPair pPair) { this._pair = pPair; this._scrambledModulus = this .scrambleModulus(((RSAPublicKey) this._pair.getPublic()) .getModulus()); }
private byte[] scrambleModulus(final BigInteger modulus) { byte[] scrambledMod = modulus.toByteArray();
if (scrambledMod.length == 0x81 && scrambledMod[0] == 0x00) { final byte[] temp = new byte[0x80]; System.arraycopy(scrambledMod, 1, temp, 0, 0x80); scrambledMod = temp; } // step 1 : 0x4d-0x50 <-> 0x00-0x04 for (int i = 0; i < 4; i++) { final byte temp = scrambledMod[0x00 + i]; scrambledMod[0x00 + i] = scrambledMod[0x4d + i]; scrambledMod[0x4d + i] = temp; } // step 2 : xor first 0x40 bytes with last 0x40 bytes for (int i = 0; i < 0x40; i++) scrambledMod[i] = (byte) (scrambledMod[i] ^ scrambledMod[0x40 + i]); // step 3 : xor bytes 0x0d-0x10 with bytes 0x34-0x38 for (int i = 0; i < 4; i++) scrambledMod[0x0d + i] = (byte) (scrambledMod[0x0d + i] ^ scrambledMod[0x34 + i]); // step 4 : xor last 0x40 bytes with first 0x40 bytes for (int i = 0; i < 0x40; i++) scrambledMod[0x40 + i] = (byte) (scrambledMod[0x40 + i] ^ scrambledMod[i]); ScrambledKeyPair._log.trace("Modulus was scrambled");
return scrambledMod; } }
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очень нужно переделать в CSharp |