112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
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/*
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* Copyright (C) 2013-2022 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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* Copyright (C) 2011-2013 Sourcefire, Inc.
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*
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* Author: Török Edvin
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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 version 2 as
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* published by the Free Software Foundation.
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#if HAVE_CONFIG_H
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#include "clamav-config.h"
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#endif
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#include "clamav-types.h"
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#include "arc4.h"
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#include <string.h>
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bool arc4_init(struct arc4_state *a, const uint8_t *key, unsigned keylength)
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{
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unsigned i;
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uint8_t j;
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uint32_t *S;
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if (NULL == a || NULL == key || 0 == keylength)
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return false;
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S = &a->S[0];
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for (i = 0; i < 256; i++)
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S[i] = i;
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for (i = 0, j = 0; i < 256; i++) {
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uint8_t tmp = S[i];
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j = j + S[i] + key[i % keylength];
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S[i] = S[j];
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S[j] = tmp;
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}
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a->i = a->j = 0;
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return true;
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}
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void arc4_apply(struct arc4_state *s, uint8_t *data, unsigned len)
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{
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uint8_t i = s->i, j = s->j;
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uint32_t *S = &s->S[0];
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while (len-- > 0) {
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uint32_t a, b;
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i++;
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a = S[i];
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j += a;
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b = S[i] = S[j];
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b += a;
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S[j] = a;
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*data++ ^= S[b & 0xff];
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}
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s->i = i;
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s->j = j;
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}
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#if 0
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#include <sys/time.h>
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static struct {
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const char *key;
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const char *plaintext;
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const char *result;
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} testdata[] = {
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{"Key", "Plaintext", "\xBB\xF3\x16\xE8\xD9\x40\xAF\x0A\xD3"},
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{"Wiki", "pedia", "\x10\x21\xBF\x04\x20"},
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{"Secret", "Attack at dawn", "\x45\xA0\x1F\x64\x5F\xC3\x5B\x38\x35\x52\x54\x4B\x9B\xF5"}
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};
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static int data[10*1024*1024];
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int main(void)
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{
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struct arc4_state a;
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uint8_t data[32];
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size_t i;
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struct timeval tv0, tv1;
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for (i=0;i<sizeof(testdata)/sizeof(testdata[0]);i++) {
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unsigned len;
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arc4_init(&a, (const uint8_t*)testdata[i].key, strlen(testdata[i].key));
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len = strlen(testdata[i].plaintext);
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memcpy(data, testdata[i].plaintext, len);
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arc4_apply(&a, data, len);
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if (memcmp(data, testdata[i].result, len)) {
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printf("Bad result at %zu\n", i);
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}
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}
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gettimeofday(&tv0, NULL);
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for (i=0;i<1000000;i++)
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arc4_apply(&a, data, sizeof(data));
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gettimeofday(&tv1, NULL);
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tv1.tv_sec -= tv0.tv_sec;
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tv1.tv_usec -= tv0.tv_usec;
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printf("Time: %f us\n", tv1.tv_sec*1000000.0 + tv1.tv_usec);
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}
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#endif
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