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/*
Legal Notice: Some portions of the source code contained in this file were
derived from the source code of TrueCrypt 7.1a, which is
Copyright (c) 2003-2012 TrueCrypt Developers Association and which is
governed by the TrueCrypt License 3.0, also 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) 2013-2016 IDRIX
and are governed by the Apache License 2.0 the full text of which is
contained in the file License.txt included in VeraCrypt 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 CachedPim[CACHE_SIZE];
int cacheEmpty = 1;
static int nPasswordIdx = 0;
int ReadVolumeHeaderWCache (BOOL bBoot, BOOL bCache, BOOL bCachePim, char *header, Password *password, int pkcs5_prf, int pim, BOOL truecryptMode, PCRYPTO_INFO *retInfo)
{
int nReturnCode = ERR_PASSWORD_WRONG;
int i, effectivePim;
/* Attempt to recognize volume using mount password */
if (password->Length > 0)
{
nReturnCode = ReadVolumeHeader (bBoot, header, password, pkcs5_prf, pim, truecryptMode, 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;
/* Store also PIM if requested, otherwise set to default */
if (bCachePim && (pim > 0))
CachedPim[nPasswordIdx] = pim;
else
CachedPim[nPasswordIdx] = 0;
/* Try another slot */
nPasswordIdx = (nPasswordIdx + 1) % CACHE_SIZE;
cacheEmpty = 0;
}
else if (bCachePim)
{
CachedPim[i] = pim > 0? pim : 0;
}
}
}
else if (!cacheEmpty)
{
/* Attempt to recognize volume using cached passwords */
for (i = 0; i < CACHE_SIZE; i++)
{
if (CachedPasswords[i].Length > 0)
{
if (truecryptMode)
effectivePim = 0;
else if (pim == -1)
effectivePim = CachedPim[i];
else
effectivePim = pim;
nReturnCode = ReadVolumeHeader (bBoot, header, &CachedPasswords[i], pkcs5_prf, effectivePim, truecryptMode, retInfo, NULL);
if (nReturnCode != ERR_PASSWORD_WRONG)
break;
}
}
}
return nReturnCode;
}
void AddPasswordToCache (Password *password, int pim)
{
int i;
for (i = 0; i < CACHE_SIZE; i++)
{
if (memcmp (&CachedPasswords[i], password, sizeof (Password)) == 0)
return;
}
CachedPasswords[nPasswordIdx] = *password;
CachedPim[nPasswordIdx] = pim > 0? pim : 0;
nPasswordIdx = (nPasswordIdx + 1) % CACHE_SIZE;
cacheEmpty = 0;
}
void WipeCache ()
{
burn (CachedPasswords, sizeof (CachedPasswords));
burn (CachedPim, sizeof (CachedPim));
nPasswordIdx = 0;
cacheEmpty = 1;
}
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