diff options
Diffstat (limited to 'lib/libncp/ncpl_crypt.c')
| -rw-r--r-- | lib/libncp/ncpl_crypt.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/lib/libncp/ncpl_crypt.c b/lib/libncp/ncpl_crypt.c new file mode 100644 index 0000000..00ce9bf --- /dev/null +++ b/lib/libncp/ncpl_crypt.c @@ -0,0 +1,137 @@ +/* + * Routines in this file based on the work of Volker Lendecke, + * Adapted for ncplib by Boris Popov + * Please note that ncpl_crypt.c file should be indentical to this one + * + * $FreeBSD$ + */ +#include <sys/param.h> +#include <sys/errno.h> +#include <sys/malloc.h> +#include <string.h> + +/*$********************************************************* + $* + $* 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]; +} + + |
