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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768/* * Copyright 2006 Mike McCormack * * based on arc4.cpp - written and placed in the public domain by Wei Dai * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA */
/* http://cryptopp.sourceforge.net/docs/ref521/arc4_8cpp-source.html */
#include "rc4.h"
void rc4_init(RC4_CONTEXT *a4i, const unsigned char *key, unsigned int keyLen){ unsigned int keyIndex = 0, stateIndex = 0; unsigned int i, a;
a4i->x = a4i->y = 0;
for (i=0; i<256; i++) a4i->state[i] = i;
for (i=0; i<256; i++) { a = a4i->state[i]; stateIndex += key[keyIndex] + a; stateIndex &= 0xff; a4i->state[i] = a4i->state[stateIndex]; a4i->state[stateIndex] = a; if (++keyIndex >= keyLen) keyIndex = 0; }}
void rc4_crypt(RC4_CONTEXT *a4i, unsigned char *inoutString, unsigned int length){ unsigned char *const s=a4i->state; unsigned int x = a4i->x; unsigned int y = a4i->y; unsigned int a, b;
while(length--) { x = (x+1) & 0xff; a = s[x]; y = (y+a) & 0xff; b = s[y]; s[x] = b; s[y] = a; *inoutString++ ^= s[(a+b) & 0xff]; }
a4i->x = x; a4i->y = y;}