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freebsd/sys/netncp/ncp_crypt.c
Peter Wemm 664a31e496 Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL" 
is an application space macro and the applications are supposed to be free
to use it as they please (but cannot).  This is consistant with the other
BSD's who made this change quite some time ago.  More commits to come.
1999-12-29 04:46:21 +00:00

275 lines
7.5 KiB
C
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/*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <netncp/ncp.h>
#include <netncp/ncp_subr.h>
/*
* Routines in this file based on work of Volker Lendecke
*/
/*$*********************************************************
$*
$* This code has been taken from DDJ 11/93, from an
$* article by Pawel Szczerbina.
$*
$* Password encryption routines follow.
$* Converted to C from Barry Nance's Pascal
$* prog published in the March -93 issue of Byte.
$*
$* Adapted to be useable for ncpfs by
$* Volker Lendecke <lendecke@namu01.gwdg.de> in
$* October 1995.
$*
$********************************************************* */
typedef unsigned char buf32[32];
static unsigned char encrypttable[256] = {
0x7, 0x8, 0x0, 0x8, 0x6, 0x4, 0xE, 0x4, 0x5, 0xC, 0x1, 0x7, 0xB, 0xF, 0xA, 0x8,
0xF, 0x8, 0xC, 0xC, 0x9, 0x4, 0x1, 0xE, 0x4, 0x6, 0x2, 0x4, 0x0, 0xA, 0xB, 0x9,
0x2, 0xF, 0xB, 0x1, 0xD, 0x2, 0x1, 0x9, 0x5, 0xE, 0x7, 0x0, 0x0, 0x2, 0x6, 0x6,
0x0, 0x7, 0x3, 0x8, 0x2, 0x9, 0x3, 0xF, 0x7, 0xF, 0xC, 0xF, 0x6, 0x4, 0xA, 0x0,
0x2, 0x3, 0xA, 0xB, 0xD, 0x8, 0x3, 0xA, 0x1, 0x7, 0xC, 0xF, 0x1, 0x8, 0x9, 0xD,
0x9, 0x1, 0x9, 0x4, 0xE, 0x4, 0xC, 0x5, 0x5, 0xC, 0x8, 0xB, 0x2, 0x3, 0x9, 0xE,
0x7, 0x7, 0x6, 0x9, 0xE, 0xF, 0xC, 0x8, 0xD, 0x1, 0xA, 0x6, 0xE, 0xD, 0x0, 0x7,
0x7, 0xA, 0x0, 0x1, 0xF, 0x5, 0x4, 0xB, 0x7, 0xB, 0xE, 0xC, 0x9, 0x5, 0xD, 0x1,
0xB, 0xD, 0x1, 0x3, 0x5, 0xD, 0xE, 0x6, 0x3, 0x0, 0xB, 0xB, 0xF, 0x3, 0x6, 0x4,
0x9, 0xD, 0xA, 0x3, 0x1, 0x4, 0x9, 0x4, 0x8, 0x3, 0xB, 0xE, 0x5, 0x0, 0x5, 0x2,
0xC, 0xB, 0xD, 0x5, 0xD, 0x5, 0xD, 0x2, 0xD, 0x9, 0xA, 0xC, 0xA, 0x0, 0xB, 0x3,
0x5, 0x3, 0x6, 0x9, 0x5, 0x1, 0xE, 0xE, 0x0, 0xE, 0x8, 0x2, 0xD, 0x2, 0x2, 0x0,
0x4, 0xF, 0x8, 0x5, 0x9, 0x6, 0x8, 0x6, 0xB, 0xA, 0xB, 0xF, 0x0, 0x7, 0x2, 0x8,
0xC, 0x7, 0x3, 0xA, 0x1, 0x4, 0x2, 0x5, 0xF, 0x7, 0xA, 0xC, 0xE, 0x5, 0x9, 0x3,
0xE, 0x7, 0x1, 0x2, 0xE, 0x1, 0xF, 0x4, 0xA, 0x6, 0xC, 0x6, 0xF, 0x4, 0x3, 0x0,
0xC, 0x0, 0x3, 0x6, 0xF, 0x8, 0x7, 0xB, 0x2, 0xD, 0xC, 0x6, 0xA, 0xA, 0x8, 0xD
};
static buf32 encryptkeys = {
0x48, 0x93, 0x46, 0x67, 0x98, 0x3D, 0xE6, 0x8D,
0xB7, 0x10, 0x7A, 0x26, 0x5A, 0xB9, 0xB1, 0x35,
0x6B, 0x0F, 0xD5, 0x70, 0xAE, 0xFB, 0xAD, 0x11,
0xF4, 0x47, 0xDC, 0xA7, 0xEC, 0xCF, 0x50, 0xC0
};
/*
* Create table-based 16-bytes hash from a 32-bytes array
*/
static void
nw_hash(buf32 temp, unsigned char *target) {
short sum;
unsigned char b3;
int s, b2, i;
sum = 0;
for (b2 = 0; b2 <= 1; ++b2) {
for (s = 0; s <= 31; ++s) {
b3 = (temp[s] + sum) ^ (temp[(s + sum) & 31] - encryptkeys[s]);
sum += b3;
temp[s] = b3;
}
}
for (i = 0; i <= 15; ++i) {
target[i] = encrypttable[temp[2 * i]]
| (encrypttable[temp[2 * i + 1]] << 4);
}
}
/*
* Create a 16-bytes pattern from given buffer based on a four bytes key
*/
void
nw_keyhash(const u_char *key, const u_char *buf, int buflen, u_char *target) {
int b2, d, s;
buf32 temp;
while (buflen > 0 && buf[buflen - 1] == 0)
buflen--;
bzero(temp, sizeof(temp));
d = 0;
while (buflen >= 32) {
for (s = 0; s <= 31; ++s)
temp[s] ^= buf[d++];
buflen -= 32;
}
b2 = d;
if (buflen > 0) {
for (s = 0; s <= 31; ++s) {
if (d + buflen == b2) {
temp[s] ^= encryptkeys[s];
b2 = d;
} else
temp[s] ^= buf[b2++];
}
}
for (s = 0; s <= 31; ++s)
temp[s] ^= key[s & 3];
nw_hash(temp, target);
}
/*
* Create an 8-bytes pattern from an 8-bytes key and 16-bytes of data
*/
void
nw_encrypt(const u_char *fra, const u_char *buf, u_char *target) {
buf32 k;
int s;
nw_keyhash(fra, buf, 16, k);
nw_keyhash(fra + 4, buf, 16, k + 16);
for (s = 0; s < 16; s++)
k[s] ^= k[31 - s];
for (s = 0; s < 8; s++)
*target++ = k[s] ^ k[15 - s];
}
#ifdef _KERNEL
/*
* MD4 routine taken from libmd sources
*/
typedef u_int32_t UINT4;
typedef unsigned char *POINTER;
#define PROTO_LIST(list) list
static void Decode PROTO_LIST
((UINT4 *, const unsigned char *, unsigned int));
/* Constants for MD4Transform routine.
*/
#define S11 3
#define S12 7
#define S13 11
#define S14 19
#define S21 3
#define S22 5
#define S23 9
#define S24 13
#define S31 3
#define S32 9
#define S33 11
#define S34 15
/* F, G and H are basic MD4 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
/* FF, GG and HH are transformations for rounds 1, 2 and 3 */
/* Rotation is separate from addition to prevent recomputation */
#define FF(a, b, c, d, x, s) { \
(a) += F ((b), (c), (d)) + (x); \
(a) = ROTATE_LEFT ((a), (s)); \
}
#define GG(a, b, c, d, x, s) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \
(a) = ROTATE_LEFT ((a), (s)); \
}
#define HH(a, b, c, d, x, s) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \
(a) = ROTATE_LEFT ((a), (s)); \
}
void
ncp_sign(const u_int32_t *state, const char *block, u_int32_t *ostate) {
UINT4 a, b, c, d, x[16];
Decode (x, block, 64);
a = state[0];
b = state[1];
c = state[2];
d = state[3];
/* Round 1 */
FF (a, b, c, d, x[ 0], S11); /* 1 */
FF (d, a, b, c, x[ 1], S12); /* 2 */
FF (c, d, a, b, x[ 2], S13); /* 3 */
FF (b, c, d, a, x[ 3], S14); /* 4 */
FF (a, b, c, d, x[ 4], S11); /* 5 */
FF (d, a, b, c, x[ 5], S12); /* 6 */
FF (c, d, a, b, x[ 6], S13); /* 7 */
FF (b, c, d, a, x[ 7], S14); /* 8 */
FF (a, b, c, d, x[ 8], S11); /* 9 */
FF (d, a, b, c, x[ 9], S12); /* 10 */
FF (c, d, a, b, x[10], S13); /* 11 */
FF (b, c, d, a, x[11], S14); /* 12 */
FF (a, b, c, d, x[12], S11); /* 13 */
FF (d, a, b, c, x[13], S12); /* 14 */
FF (c, d, a, b, x[14], S13); /* 15 */
FF (b, c, d, a, x[15], S14); /* 16 */
/* Round 2 */
GG (a, b, c, d, x[ 0], S21); /* 17 */
GG (d, a, b, c, x[ 4], S22); /* 18 */
GG (c, d, a, b, x[ 8], S23); /* 19 */
GG (b, c, d, a, x[12], S24); /* 20 */
GG (a, b, c, d, x[ 1], S21); /* 21 */
GG (d, a, b, c, x[ 5], S22); /* 22 */
GG (c, d, a, b, x[ 9], S23); /* 23 */
GG (b, c, d, a, x[13], S24); /* 24 */
GG (a, b, c, d, x[ 2], S21); /* 25 */
GG (d, a, b, c, x[ 6], S22); /* 26 */
GG (c, d, a, b, x[10], S23); /* 27 */
GG (b, c, d, a, x[14], S24); /* 28 */
GG (a, b, c, d, x[ 3], S21); /* 29 */
GG (d, a, b, c, x[ 7], S22); /* 30 */
GG (c, d, a, b, x[11], S23); /* 31 */
GG (b, c, d, a, x[15], S24); /* 32 */
/* Round 3 */
HH (a, b, c, d, x[ 0], S31); /* 33 */
HH (d, a, b, c, x[ 8], S32); /* 34 */
HH (c, d, a, b, x[ 4], S33); /* 35 */
HH (b, c, d, a, x[12], S34); /* 36 */
HH (a, b, c, d, x[ 2], S31); /* 37 */
HH (d, a, b, c, x[10], S32); /* 38 */
HH (c, d, a, b, x[ 6], S33); /* 39 */
HH (b, c, d, a, x[14], S34); /* 40 */
HH (a, b, c, d, x[ 1], S31); /* 41 */
HH (d, a, b, c, x[ 9], S32); /* 42 */
HH (c, d, a, b, x[ 5], S33); /* 43 */
HH (b, c, d, a, x[13], S34); /* 44 */
HH (a, b, c, d, x[ 3], S31); /* 45 */
HH (d, a, b, c, x[11], S32); /* 46 */
HH (c, d, a, b, x[ 7], S33); /* 47 */
HH (b, c, d, a, x[15], S34); /* 48 */
ostate[0] = state[0] + a;
ostate[1] = state[1] + b;
ostate[2] = state[2] + c;
ostate[3] = state[3] + d;
}
/* Decodes input (unsigned char) into output (UINT4). Assumes len is
a multiple of 4.
*/
static void Decode (output, input, len)
UINT4 *output;
const unsigned char *input;
unsigned int len;
{
unsigned int i, j;
for (i = 0, j = 0; j < len; i++, j += 4)
output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
(((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
}
#endif /* _KERNEL */
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