Page MenuHomeFreeBSD
Differential D7306 Diff 18759 lib/libcrypt/crypt-nthash.c

Changeset View

Standalone View

View Options

lib/libcrypt/crypt-nthash.c

Show All 40 Lines
#include "crypt.h" #include "crypt.h"
/* /*
* NT HASH = md4(str2unicode(pw)) * NT HASH = md4(str2unicode(pw))
*/ */
/* ARGSUSED */ /* ARGSUSED */
char * int
crypt_nthash(const char *pw, const char *salt __unused) crypt_nthash(const char *pw, const char *salt __unused, char *buffer)
{ {
size_t unipwLen; size_t unipwLen;
int i, j; int i;
static char hexconvtab[] = "0123456789abcdef"; static const char hexconvtab[] = "0123456789abcdef";
static const char *magic = "$3$"; static const char *magic = "$3$";
static char passwd[120];
u_int16_t unipw[128]; u_int16_t unipw[128];
char final[MD4_SIZE*2 + 1];
u_char hash[MD4_SIZE]; u_char hash[MD4_SIZE];
const char *s; const char *s;
MD4_CTX ctx; MD4_CTX ctx;
bzero(unipw, sizeof(unipw)); bzero(unipw, sizeof(unipw));
/* convert to unicode (thanx Archie) */ /* convert to unicode (thanx Archie) */
unipwLen = 0; unipwLen = 0;
for (s = pw; unipwLen < sizeof(unipw) / 2 && *s; s++) for (s = pw; unipwLen < sizeof(unipw) / 2 && *s; s++)
unipw[unipwLen++] = htons(*s << 8); unipw[unipwLen++] = htons(*s << 8);
/* Compute MD4 of Unicode password */ /* Compute MD4 of Unicode password */
MD4Init(&ctx); MD4Init(&ctx);
MD4Update(&ctx, (u_char *)unipw, unipwLen*sizeof(u_int16_t)); MD4Update(&ctx, (u_char *)unipw, unipwLen*sizeof(u_int16_t));
MD4Final(hash, &ctx); MD4Final(hash, &ctx);
for (i = j = 0; i < MD4_SIZE; i++) { buffer = stpcpy(buffer, magic);
final[j++] = hexconvtab[hash[i] >> 4]; *buffer++ = '$';
final[j++] = hexconvtab[hash[i] & 15]; for (i = 0; i < MD4_SIZE; i++) {
*buffer++ = hexconvtab[hash[i] >> 4];
*buffer++ = hexconvtab[hash[i] & 15];
} }
final[j] = '\0'; *buffer = '\0';
strcpy(passwd, magic); return (0);
strcat(passwd, "$");
strncat(passwd, final, MD4_SIZE*2);
/* Don't leave anything around in vm they could use. */
memset(final, 0, sizeof(final));
return (passwd);
} }