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Fredrik Hübinette (Hubbe) authored
Rev: src/array.c:1.8 Rev: src/builtin_functions.c:1.35 Rev: src/callback.c:1.8 Rev: src/configure.in:1.84 Rev: src/constants.c:1.10 Rev: src/encode.c:1.9 Rev: src/fd_control.c:1.6 Rev: src/gc.c:1.8 Rev: src/interpret.c:1.42 Rev: src/las.c:1.31 Rev: src/lex.c:1.21 Rev: src/main.c:1.21 Rev: src/mapping.c:1.17 Rev: src/memory.h:1.3 Rev: src/module_support.c:1.7 Rev: src/modules/Gmp/mpz_glue.c:1.11 Rev: src/modules/Image/font.c:1.7 Rev: src/modules/Pipe/pipe.c:1.6 Rev: src/modules/Regexp/glue.c:1.5 Rev: src/modules/Yp/yp.c:1.6 Rev: src/modules/_Crypto/Makefile.in:1.9 Rev: src/modules/_Crypto/lib/Makefile.in:1.5 Rev: src/modules/dynamic_module_makefile.in:1.7 Rev: src/modules/files/efuns.c:1.22 Rev: src/modules/files/file.c:1.36 Rev: src/modules/math/math.c:1.4 Rev: src/modules/spider/accesseddb.c:1.7 Rev: src/modules/spider/discdate.c:1.4 Rev: src/modules/spider/dumudp.c:1.8 Rev: src/modules/spider/spider.c:1.29 Rev: src/modules/spider/streamed_parser.c:1.5 Rev: src/modules/sprintf/sprintf.c:1.10 Rev: src/modules/static_module_makefile.in:1.5 Rev: src/modules/system/passwords.c:1.2 Rev: src/modules/system/syslog.c:1.3 Rev: src/modules/system/system.c:1.16 Rev: src/object.c:1.17 Rev: src/opcodes.c:1.6 Rev: src/operators.c:1.13 Rev: src/peep.c:1.10 Rev: src/pike_types.c:1.21 Rev: src/port.c:1.11 Rev: src/port.h:1.16 Rev: src/program.c:1.33 Rev: src/signal_handler.c:1.11 Rev: src/stralloc.c:1.14 Rev: src/stuff.c:1.2 Rev: src/svalue.c:1.9 Rev: src/threads.c:1.21
Fredrik Hübinette (Hubbe) authoredRev: src/array.c:1.8 Rev: src/builtin_functions.c:1.35 Rev: src/callback.c:1.8 Rev: src/configure.in:1.84 Rev: src/constants.c:1.10 Rev: src/encode.c:1.9 Rev: src/fd_control.c:1.6 Rev: src/gc.c:1.8 Rev: src/interpret.c:1.42 Rev: src/las.c:1.31 Rev: src/lex.c:1.21 Rev: src/main.c:1.21 Rev: src/mapping.c:1.17 Rev: src/memory.h:1.3 Rev: src/module_support.c:1.7 Rev: src/modules/Gmp/mpz_glue.c:1.11 Rev: src/modules/Image/font.c:1.7 Rev: src/modules/Pipe/pipe.c:1.6 Rev: src/modules/Regexp/glue.c:1.5 Rev: src/modules/Yp/yp.c:1.6 Rev: src/modules/_Crypto/Makefile.in:1.9 Rev: src/modules/_Crypto/lib/Makefile.in:1.5 Rev: src/modules/dynamic_module_makefile.in:1.7 Rev: src/modules/files/efuns.c:1.22 Rev: src/modules/files/file.c:1.36 Rev: src/modules/math/math.c:1.4 Rev: src/modules/spider/accesseddb.c:1.7 Rev: src/modules/spider/discdate.c:1.4 Rev: src/modules/spider/dumudp.c:1.8 Rev: src/modules/spider/spider.c:1.29 Rev: src/modules/spider/streamed_parser.c:1.5 Rev: src/modules/sprintf/sprintf.c:1.10 Rev: src/modules/static_module_makefile.in:1.5 Rev: src/modules/system/passwords.c:1.2 Rev: src/modules/system/syslog.c:1.3 Rev: src/modules/system/system.c:1.16 Rev: src/object.c:1.17 Rev: src/opcodes.c:1.6 Rev: src/operators.c:1.13 Rev: src/peep.c:1.10 Rev: src/pike_types.c:1.21 Rev: src/port.c:1.11 Rev: src/port.h:1.16 Rev: src/program.c:1.33 Rev: src/signal_handler.c:1.11 Rev: src/stralloc.c:1.14 Rev: src/stuff.c:1.2 Rev: src/svalue.c:1.9 Rev: src/threads.c:1.21
arcfour.c 2.18 KiB
/* arcfour.c
*
* The arcfour/rc4 stream cipher.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2001 Niels Mller
*
* The nettle 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.
*
* The nettle 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 the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#include "arcfour.h"
#include <assert.h>
#define SWAP(a,b) do { int _t = a; a = b; b = _t; } while(0)
void
arcfour_set_key(struct arcfour_ctx *ctx,
unsigned length, const uint8_t *key)
{
unsigned i, j, k;
assert(length >= ARCFOUR_MIN_KEY_SIZE);
assert(length <= ARCFOUR_MAX_KEY_SIZE);
/* Initialize context */
for (i = 0; i<256; i++)
ctx->S[i] = i;
for (i = j = k = 0; i<256; i++)
{
j += ctx->S[i] + key[k]; j &= 0xff;
SWAP(ctx->S[i], ctx->S[j]);
/* Repeat key as needed */
k = (k + 1) % length;
}
ctx->i = ctx->j = 0;
}
void
arcfour_crypt(struct arcfour_ctx *ctx,
unsigned length, uint8_t *dst,
const uint8_t *src)
{
register uint8_t i, j;
i = ctx->i; j = ctx->j;
while(length--)
{
i++; i &= 0xff;
j += ctx->S[i]; j &= 0xff;
SWAP(ctx->S[i], ctx->S[j]);
*dst++ = *src++ ^ ctx->S[ (ctx->S[i] + ctx->S[j]) & 0xff ];
} ctx->i = i; ctx->j = j;
}
void
arcfour_stream(struct arcfour_ctx *ctx,
unsigned length, uint8_t *dst)
{
register uint8_t i, j;
i = ctx->i; j = ctx->j;
while(length--)
{
i++; i &= 0xff;
j += ctx->S[i]; j &= 0xff;
SWAP(ctx->S[i], ctx->S[j]);
*dst++ = ctx->S[ (ctx->S[i] + ctx->S[j]) & 0xff ];
}
ctx->i = i; ctx->j = j;
}