Add RC4 encryption/decryption function

Originally committed as revision 10723 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2007-10-13 10:42:11 +00:00
parent 211dd1e81f
commit 80b1c5a858
3 changed files with 50 additions and 0 deletions

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@ -14,6 +14,7 @@ OBJS = adler32.o \
mem.o \ mem.o \
random.o \ random.o \
rational.o \ rational.o \
rc4.o \
string.o \ string.o \
tree.o \ tree.o \

48
libavutil/rc4.c Normal file
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@ -0,0 +1,48 @@
/*
* RC4 encryption/decryption/pseudo-random number generator
* Copyright (c) 2007 Reimar Doeffinger
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* loosely based on LibTomCrypt by Tom St Denis
*/
#include "common.h"
#include "rc4.h"
void ff_rc4_enc(const uint8_t *key, int keylen, uint8_t *data, int datalen) {
int i, j;
uint8_t x, y;
uint8_t state[256];
for (i = 0; i < 256; i++)
state[i] = i;
y = 0;
// j is i % keylen
for (j = 0, i = 0; i < 256; i++, j++) {
if (j == keylen) j = 0;
y += state[i] + key[j];
FFSWAP(uint8_t, state[i], state[y]);
}
// state initialized, now do the real encryption
x = 1; y = state[1];
while (datalen-- > 0) {
uint8_t sum = state[x] + state[y];
FFSWAP(uint8_t, state[x], state[y]);
*data++ ^= state[sum];
x++;
y += state[x];
}
}

1
libavutil/rc4.h Normal file
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@ -0,0 +1 @@
void ff_rc4_enc(const uint8_t *key, int keylen, uint8_t *data, int datalen);