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106 lines
2.7 KiB
C
106 lines
2.7 KiB
C
/*
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* Copyright 2006 Mike McCormack
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*
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* based on arc4.cpp - written and placed in the public domain by Wei Dai
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* http://cryptopp.sourceforge.net/docs/ref521/arc4_8cpp-source.html */
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#include <stdarg.h>
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#include "ntstatus.h"
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#define WIN32_NO_STATUS
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#include "windef.h"
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#include "winternl.h"
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#include "crypt.h"
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typedef struct tag_arc4_info {
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unsigned char state[256];
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unsigned char x, y;
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} arc4_info;
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static void arc4_init(arc4_info *a4i, const BYTE *key, unsigned int keyLen)
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{
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unsigned int keyIndex = 0, stateIndex = 0;
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unsigned int i, a;
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a4i->x = a4i->y = 0;
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for (i=0; i<256; i++)
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a4i->state[i] = i;
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for (i=0; i<256; i++)
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{
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a = a4i->state[i];
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stateIndex += key[keyIndex] + a;
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stateIndex &= 0xff;
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a4i->state[i] = a4i->state[stateIndex];
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a4i->state[stateIndex] = a;
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if (++keyIndex >= keyLen)
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keyIndex = 0;
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}
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}
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static void arc4_ProcessString(arc4_info *a4i, BYTE *inoutString, unsigned int length)
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{
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BYTE *const s=a4i->state;
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unsigned int x = a4i->x;
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unsigned int y = a4i->y;
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unsigned int a, b;
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while(length--)
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{
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x = (x+1) & 0xff;
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a = s[x];
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y = (y+a) & 0xff;
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b = s[y];
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s[x] = b;
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s[y] = a;
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*inoutString++ ^= s[(a+b) & 0xff];
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}
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a4i->x = x;
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a4i->y = y;
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}
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/******************************************************************************
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* SystemFunction032 [ADVAPI32.@]
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*
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* Encrypts a string data using ARC4
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*
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* PARAMS
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* data [I/O] data to encrypt
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* key [I] key data
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*
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* RETURNS
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* Success: STATUS_SUCCESS
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* Failure: STATUS_UNSUCCESSFUL
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*
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* NOTES
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* see http://web.it.kth.se/~rom/ntsec.html#crypto-strongavail
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*/
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NTSTATUS WINAPI SystemFunction032(struct ustring *data, struct ustring *key)
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{
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arc4_info a4i;
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arc4_init(&a4i, key->Buffer, key->Length);
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arc4_ProcessString(&a4i, data->Buffer, data->Length);
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return STATUS_SUCCESS;
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}
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