hondacrx
69 lines
1.9 KiB
C#
69 lines
1.9 KiB
C#
/*
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* Copyright (C) 2012-2018 CypherCore <http://github.com/CypherCore>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System.Security.Cryptography;
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namespace Framework.Cryptography
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{
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public class SessionKeyGenerator
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{
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public SessionKeyGenerator(byte[] buff, int size)
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{
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int halfSize = size / 2;
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sh = SHA256.Create();
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sh.TransformFinalBlock(buff, 0, halfSize);
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o1 = sh.Hash;
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sh.Initialize();
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sh.TransformFinalBlock(buff, halfSize, size - halfSize);
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o2 = sh.Hash;
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FillUp();
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}
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public void Generate(byte[] buf, uint sz)
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{
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for (uint i = 0; i < sz; ++i)
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{
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if (taken == 32)
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FillUp();
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buf[i] = o0[taken];
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taken++;
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}
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}
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void FillUp()
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{
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sh.Initialize();
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sh.TransformBlock(o1, 0, 32, o1, 0);
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sh.TransformBlock(o0, 0, 32, o0, 0);
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sh.TransformFinalBlock(o2, 0, 32);
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o0 = sh.Hash;
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taken = 0;
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}
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SHA256 sh;
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uint taken;
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byte[] o0 = new byte[32];
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byte[] o1 = new byte[32];
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byte[] o2 = new byte[32];
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}
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}
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