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Initial 1.0.0

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git-svn-id: svn://svn.code.sf.net/p/axtls/code/axTLS@2 9a5d90b5-6617-0410-8a86-bb477d3ed2e3
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cameronrich
2006-07-01 00:39:15 +00:00
commit fa18d60b98
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/*
* Copyright(C) 2006
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* @file rc4.c
*
* An implementation of the RC4/ARC4 algorithm
*
* Originally written by Christophe Devine
*/
#include <string.h>
#include "crypto.h"
/**
* Get ready for an encrypt/decrypt operation
*/
void RC4_setup(RC4_CTX *ctx, const uint8_t *key, int length)
{
int i, j = 0, k = 0, *m, a;
ctx->x = 0;
ctx->y = 0;
m = ctx->m;
for (i = 0; i < 256; i++)
{
m[i] = i;
}
for (i = 0; i < 256; i++)
{
a = m[i];
j = (uint8_t)(j + a + key[k]);
m[i] = m[j]; m[j] = a;
if (++k >= length)
{
k = 0;
}
}
}
/**
* Perform the encrypt/decrypt operation (can use it for either since
* this is a stream cipher).
*/
void RC4_crypt(RC4_CTX *ctx, const uint8_t *msg, uint8_t *out, int length)
{
int i, x, y, *m, a, b;
out = (uint8_t *)msg;
x = ctx->x;
y = ctx->y;
m = ctx->m;
for (i = 0; i < length; i++)
{
x =(uint8_t)(x + 1); a = m[x];
y =(uint8_t)(y + a);
m[x] = b = m[y];
m[y] = a;
out[i] ^= m[(uint8_t)(a + b)];
}
ctx->x = x;
ctx->y = y;
}