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/*
Legal Notice: Some portions of the source code contained in this file were
derived from the source code of Encryption for the Masses 2.02a, which is
Copyright (c) 1998-2000 Paul Le Roux and which is governed by the 'License
Agreement for Encryption for the Masses'. Modifications and additions to
the original source code (contained in this file) and all other portions
of this file are Copyright (c) 2003-2008 TrueCrypt Developers Association
and are governed by the TrueCrypt License 3.0 the full text of which is
contained in the file License.txt included in TrueCrypt binary and source
code distribution packages. */
#include "Tcdefs.h"
#include "Crypto.h"
#include "Fat.h"
#include "Volumes.h"
#include "Apidrvr.h"
#include "Common.h"
#include "Cache.h"
Password CachedPasswords[CACHE_SIZE];
int cacheEmpty = 1;
static int nPasswordIdx = 0;
int ReadVolumeHeaderWCache (BOOL bBoot, BOOL bCache, char *header, Password *password, int pkcs5_prf, PCRYPTO_INFO *retInfo)
{
int nReturnCode = ERR_PASSWORD_WRONG;
int i;
/* Attempt to recognize volume using mount password */
if (password->Length > 0)
{
nReturnCode = ReadVolumeHeader (bBoot, header, password, pkcs5_prf, retInfo, NULL);
/* Save mount passwords back into cache if asked to do so */
if (bCache && (nReturnCode == 0 || nReturnCode == ERR_CIPHER_INIT_WEAK_KEY))
{
for (i = 0; i < CACHE_SIZE; i++)
{
if (memcmp (&CachedPasswords[i], password, sizeof (Password)) == 0)
break;
}
if (i == CACHE_SIZE)
{
/* Store the password */
CachedPasswords[nPasswordIdx] = *password;
/* Try another slot */
nPasswordIdx = (nPasswordIdx + 1) % CACHE_SIZE;
cacheEmpty = 0;
}
}
}
else if (!cacheEmpty)
{
/* Attempt to recognize volume using cached passwords */
for (i = 0; i < CACHE_SIZE; i++)
{
if (CachedPasswords[i].Length > 0)
{
nReturnCode = ReadVolumeHeader (bBoot, header, &CachedPasswords[i], pkcs5_prf, retInfo, NULL);
if (nReturnCode != ERR_PASSWORD_WRONG)
break;
}
}
}
return nReturnCode;
}
void AddPasswordToCache (Password *password)
{
int i;
for (i = 0; i < CACHE_SIZE; i++)
{
if (memcmp (&CachedPasswords[i], password, sizeof (Password)) == 0)
return;
}
CachedPasswords[nPasswordIdx] = *password;
nPasswordIdx = (nPasswordIdx + 1) % CACHE_SIZE;
cacheEmpty = 0;
}
void WipeCache ()
{
burn (CachedPasswords, sizeof (CachedPasswords));
nPasswordIdx = 0;
cacheEmpty = 1;
}
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