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58 lines
1.5 KiB
58 lines
1.5 KiB
/*
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Copyright (C) 2003-2008 Dominik Reichl <dominik.reichl@t-online.de>
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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 2 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "arcfour.h"
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void CArcFour::setKey(quint8* key, uint length){
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RawKey = key;
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RawKeyLength = length;
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}
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void CArcFour::encrypt(const quint8* src, quint8* dst, uint length){
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quint8 S[256];
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quint32 w;
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for(w = 0; w < 256; ++w)
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S[w] = static_cast<quint8>(w); // Fill linearly
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const quint8 btBufDep = static_cast<quint8>((length & 0xFF) << 1);
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quint8 i = 0, j = 0, t;
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quint32 k = 0;
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for(w = 0; w < 256; ++w) // Key setup
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{
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j += S[w] + RawKey[k] + btBufDep;
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t = S[i]; S[i] = S[j]; S[j] = t; // Swap entries
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++k;
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if(k == RawKeyLength) k = 0;
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}
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i = 0; j = 0;
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for(w = 0; w < length; ++w) // Encrypt PT
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{
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++i;
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j += S[i];
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t = S[i]; S[i] = S[j]; S[j] = t; // Swap entries
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t = S[i] + S[j]; // Generate random byte
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dst[w] = src[w] ^ S[t]; // XOR with PT
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}
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}
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