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138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
/*
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* Routines in this file based on the work of Volker Lendecke,
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* Adapted for ncplib by Boris Popov
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* Please note that ncpl_crypt.c file should be indentical to this one
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/errno.h>
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#include <sys/malloc.h>
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#include <string.h>
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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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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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