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/*
* ARC - Archive utility - ARCCODE
*
* Version 1.02, created on 01/20/86 at 13:33:35
*
* (C) COPYRIGHT 1985-87 by System Enhancement Associates.
* You may copy and distribute this program freely,
* under the terms of the General Public License.
*
* By: Thom Henderson
*
* Description: This file contains the routines used to encrypt and decrypt data
* in an archive. The encryption method is nothing fancy, being just a
* routine XOR, but it is used on the packed data, and uses a variable length
* key. The end result is something that is in theory crackable, but I'd
* hate to try it. It should be more than sufficient for casual use.
*
* Language: Computer Innovations Optimizing C86
*/
#include <stdio.h>
#include "arc.h"
static char *p; /* password pointer */
VOID
setcode()
{ /* get set for encoding/decoding */
p = password; /* reset password pointer */
}
VOID
codebuf(buf, len) /* encrypt a buffer */
reg char *buf;
u_int len;
{
reg u_int i;
reg char *pasptr = p;
for (i = 0; i < len; i++) {
if (!*pasptr)
pasptr = password;
*buf++ ^= *pasptr++;
}
p = pasptr;
}
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