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#include <conf.h>
#include <unistd.h>
#include <fcntl.h>
#include <math.h>
#include <errno.h>
#include <utils.h>
#include <x_types.h>
#include "backup.h"
#ifndef XOR
#define XOR(a,b) (((a) & ~(b)) | (~(a) & (b)))
#endif
#ifdef USE_DES_ENCRYPTION
#include "des_aux.h"
static UChar *initstring = "Albi's encryption initialization string";
static des_key_schedule accesskeys[2];
Int32
set_cryptkey(UChar * filename)
{
struct stat statb;
Int32 i, fd, ret = 0;
Uns32 n, factor, prevval, newval;
UChar buf[100], *kptr, *endptr, *bufptr;
des_cblock rawkeys[2];
buf[0] = '\0';
if(filename){
i = stat(filename, &statb);
if(i)
ret = ENOENT;
else{
fd = open(filename, O_RDONLY);
if(fd < 0){
ret = EACCES;
}
else{
i = read(fd, buf, 99);
close(fd);
if(i < 0)
i = 0;
buf[i] = '\0';
}
}
}
if(ret || !filename)
strncpy(buf, ACCESSKEYSTRING, 99);
if(!buf[0])
memset(buf, 0x5a, 99);
buf[99] = '\0';
memset(rawkeys, 0x5a, 2 * sizeof(des_cblock));
kptr = (UChar *) &(rawkeys[0]);
endptr = kptr + 2 * sizeof(des_cblock);
bufptr = buf + 1;
prevval = buf[0] % 0x40;
factor = 0x40;
forever{
if(! *bufptr)
break;
newval = prevval + factor * ((*bufptr) % 0x40);
factor *= 0x40;
if((newval & 0xff) == (prevval & 0xff) && factor >= 0x0100){
*kptr = (prevval & 0xff);
kptr++;
if(kptr >= endptr)
break;
factor /= 0x0100;
newval /= 0x0100;
}
prevval = newval;
bufptr++;
}
while(kptr < endptr && prevval){
*(kptr++) = prevval & 0xff;
prevval /= 0x0100;
}
if(des_set_key(rawkeys, accesskeys[0])
|| des_set_key(rawkeys + 1, accesskeys[1]))
ret = -1;
return(ret);
}
Uns32
encrpt(UChar * buf)
{
UChar lbuf[20], mask, *cptr;
des_cblock ivec[2];
Int32 i;
cptr = (UChar *) ivec;
mask = 0xdf;
for(i = 0; i < sizeof(des_cblock) * 2; i++, cptr++){
*cptr = XOR(mask, initstring[i]);
mask = XOR(mask, initstring[i]);
}
des_3cbc_encrypt((des_cblock *) buf, (des_cblock *) lbuf,
16 * sizeof(UChar),
accesskeys[0], accesskeys[1], ivec, ivec + 1, 1);
memcpy(buf, lbuf, 16 * sizeof(UChar));
}
#else /* defined(USE_DES_ENCRYPTION) */
#define PI_1_8 (M_PI / 8.0)
#define PI_3_8 (M_PI / 8.0 * 3.0)
#define S_PI_1_8 sin(PI_1_8)
#define S_PI_3_8 sin(PI_3_8)
#define LOG_8 log(8.0)
#define LOG_12 log(12.0)
static Uns32 accesskey = ACCESSKEY;
Int32
set_cryptkey(UChar * filename)
{
struct stat statb;
Int32 i, fd;
Uns32 n;
UChar buf[10];
if(!filename)
return(0);
i = stat(filename, &statb);
if(i)
return(ENOENT);
fd = open(filename, O_RDONLY);
if(fd < 0)
return(EACCES);
i = read(fd, buf, 5);
close(fd);
if(i < 5)
return(EIO);
n = 0;
for(i = 0; i < 5; i++)
n = (n * 96 + ((buf[i] & 0x7f) - 32)) & 0xffffffff;
accesskey = n;
return(0);
}
Uns32
encrpt(Uns32 in)
{
Uns32 inp, a, b;
inp = XOR(in, accesskey);
a = inp >> 5;
a &= (1 << 13) - 1;
a = (Uns32) ((sin((double)a / 8192.0 * (PI_3_8 - PI_1_8) + PI_1_8)
- S_PI_1_8) / (S_PI_3_8 - S_PI_1_8) * 8192.0);
b = a;
a = inp & ((1 << 5) - 1);
a = a * a * a;
a &= ((1 << 5) - 1);
b |= a << 13;
a = (inp >> 18);
a &= (1 << 9) - 1;
a = (Uns32) ((log((double)a / 512.0 * 4.0 + 8.0) - LOG_8)
/ (LOG_12 - LOG_8) * 512.0);
b |= a << 23;
a = (inp >> 27);
a &= (1 << 5) - 1;
a = (Uns32) ((4.0 - sqrt((double)a / 32.0 * 7.0 + 9.0)) * 32.0);
b |= a << 18;
return(b);
}
#endif /* ifelse defined(USE_DES_ENCRYPTION) */
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