mirror of
https://github.com/veracrypt/VeraCrypt.git
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97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/*
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Legal Notice: Some portions of the source code contained in this file were
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derived from the source code of TrueCrypt 7.1a, which is
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Copyright (c) 2003-2012 TrueCrypt Developers Association and which is
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governed by the TrueCrypt License 3.0, also from the source code of
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Encryption for the Masses 2.02a, which is Copyright (c) 1998-2000 Paul Le Roux
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and which is governed by the 'License Agreement for Encryption for the Masses'
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Modifications and additions to the original source code (contained in this file)
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and all other portions of this file are Copyright (c) 2013-2015 IDRIX
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and are governed by the Apache License 2.0 the full text of which is
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contained in the file License.txt included in VeraCrypt binary and source
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code distribution packages. */
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#include "Tcdefs.h"
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#include "Crypto.h"
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#include "Fat.h"
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#include "Volumes.h"
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#include "Apidrvr.h"
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#include "Common.h"
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#include "Cache.h"
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Password CachedPasswords[CACHE_SIZE];
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int cacheEmpty = 1;
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static int nPasswordIdx = 0;
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int ReadVolumeHeaderWCache (BOOL bBoot, BOOL bCache, char *header, Password *password, int pkcs5_prf, int pim, BOOL truecryptMode, PCRYPTO_INFO *retInfo)
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{
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int nReturnCode = ERR_PASSWORD_WRONG;
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int i;
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/* Attempt to recognize volume using mount password */
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if (password->Length > 0)
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{
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nReturnCode = ReadVolumeHeader (bBoot, header, password, pkcs5_prf, pim, truecryptMode, retInfo, NULL);
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/* Save mount passwords back into cache if asked to do so */
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if (bCache && (nReturnCode == 0 || nReturnCode == ERR_CIPHER_INIT_WEAK_KEY))
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{
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for (i = 0; i < CACHE_SIZE; i++)
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{
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if (memcmp (&CachedPasswords[i], password, sizeof (Password)) == 0)
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break;
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}
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if (i == CACHE_SIZE)
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{
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/* Store the password */
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CachedPasswords[nPasswordIdx] = *password;
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/* Try another slot */
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nPasswordIdx = (nPasswordIdx + 1) % CACHE_SIZE;
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cacheEmpty = 0;
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}
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}
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}
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else if (!cacheEmpty)
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{
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/* Attempt to recognize volume using cached passwords */
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for (i = 0; i < CACHE_SIZE; i++)
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{
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if (CachedPasswords[i].Length > 0)
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{
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nReturnCode = ReadVolumeHeader (bBoot, header, &CachedPasswords[i], pkcs5_prf, pim, truecryptMode, retInfo, NULL);
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if (nReturnCode != ERR_PASSWORD_WRONG)
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break;
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}
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}
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}
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return nReturnCode;
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}
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void AddPasswordToCache (Password *password)
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{
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int i;
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for (i = 0; i < CACHE_SIZE; i++)
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{
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if (memcmp (&CachedPasswords[i], password, sizeof (Password)) == 0)
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return;
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}
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CachedPasswords[nPasswordIdx] = *password;
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nPasswordIdx = (nPasswordIdx + 1) % CACHE_SIZE;
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cacheEmpty = 0;
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}
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void WipeCache ()
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{
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burn (CachedPasswords, sizeof (CachedPasswords));
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nPasswordIdx = 0;
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cacheEmpty = 1;
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}
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