-/* $OpenBSD: deattack.c,v 1.15 2001/11/19 19:02:16 mpech Exp $ */
-
/*
* Cryptographic attack detector for ssh - source code
*
*/
#include "includes.h"
+RCSID("$OpenBSD: deattack.c,v 1.19 2003/09/18 08:49:45 markus Exp $");
+
#include "deattack.h"
#include "log.h"
#include "crc32.h"
#include "getput.h"
#include "xmalloc.h"
+#include "deattack.h"
/* SSH Constants */
#define SSH_MAXBLOCKS (32 * 1024)
#define HASH_FACTOR(x) ((x)*3/2)
#define HASH_UNUSEDCHAR (0xff)
#define HASH_UNUSED (0xffff)
-#define HASH_IV (0xfffe)
+#define HASH_IV (0xfffe)
#define HASH_MINBLOCKS (7*SSH_BLOCKSIZE)
if (h == NULL) {
debug("Installing crc compensation attack detector.");
+ h = (u_int16_t *) xmalloc(l * HASH_ENTRYSIZE);
n = l;
- h = (u_int16_t *) xmalloc(n * HASH_ENTRYSIZE);
} else {
if (l > n) {
+ h = (u_int16_t *) xrealloc(h, l * HASH_ENTRYSIZE);
n = l;
- h = (u_int16_t *) xrealloc(h, n * HASH_ENTRYSIZE);
}
}
for (c = buf, j = 0; c < (buf + len); c += SSH_BLOCKSIZE, j++) {
for (i = HASH(c) & (n - 1); h[i] != HASH_UNUSED;
- i = (i + 1) & (n - 1)) {
+ i = (i + 1) & (n - 1)) {
if (h[i] == HASH_IV) {
if (!CMP(c, IV)) {
if (check_crc(c, buf, len, IV))