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