/*  name      ZeroAccess  type      rootkit  cve       —  year      unknown  os        Windows  authors   unknown  source    RamadhanAmizudin/malware  archived  RamadhanAmizudin, krisyotam (2026)  notes     — */ /** rc4.c** Copyright (c) 1996-2000 Whistle Communications, Inc.* All rights reserved.** Subject to the following obligations and disclaimer of warranty, use and* redistribution of this software, in source or object code forms, with or* without modifications are expressly permitted by Whistle Communications;* provided, however, that:* 1. Any and all reproductions of the source or object code must include the*    copyright notice above and the following disclaimer of warranties; and* 2. No rights are granted, in any manner or form, to use Whistle*    Communications, Inc. trademarks, including the mark "WHISTLE*    COMMUNICATIONS" on advertising, endorsements, or otherwise except as*    such appears in the above copyright notice or in the software.** THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY* OF SUCH DAMAGE.** $FreeBSD: src/sys/crypto/rc4/rc4.c,v 1.2.2.1 2000/04/18 04:48:31 archie Exp $*/ #include "rc4.h" static __inline voidswap_bytes(unsigned char *a, unsigned char *b){	unsigned char temp; 	temp = *a;	*a = *b;	*b = temp;} /** Initialize an RC4 state buffer using the supplied key,* which can have arbitrary length.*/voidrc4_init(rc4_state *state, const unsigned char *key, unsigned long keylen){	unsigned char j = 0;	unsigned long i; 	/* Initialize state with identity permutation */	for (i = 0; i < 256; i++)		state->perm[i] = (unsigned char)i;	state->index1 = 0;	state->index2 = 0; 	/* Randomize the permutation using key data */	for (i = 0; i < 256; i++) {		j += state->perm[i] + key[i % keylen];		swap_bytes(&state->perm[i], &state->perm[j]);	}} /** Encrypt some data using the supplied RC4 state buffer.* The input and output buffers may be the same buffer.* Since RC4 is a stream cypher, this function is used* for both encryption and decryption.*/voidrc4_crypt(rc4_state *state,	const unsigned char *inbuf, unsigned char *outbuf, unsigned long buflen){	unsigned long i;	unsigned char j; 	for (i = 0; i < buflen; i++) { 		/* Update modification indicies */		state->index1++;		state->index2 += state->perm[state->index1]; 		/* Modify permutation */		swap_bytes(&state->perm[state->index1],			&state->perm[state->index2]); 		/* Encrypt/decrypt next byte */		j = state->perm[state->index1] + state->perm[state->index2];		outbuf[i] = inbuf[i] ^ state->perm[j];	}}