/* * $FreeBSD: src/sys/netncp/ncp_crypt.c,v 1.3.2.1 2001/02/22 08:57:58 bp Exp $ * $DragonFly: src/sys/netproto/ncp/ncp_crypt.c,v 1.3 2003/08/07 21:17:38 dillon Exp $ */ #include #include #include "ncp.h" #include "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 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 */