VeraCrypt
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path: root/src/Boot/Windows/Bios.h
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/*
 Derived from source code of TrueCrypt 7.1a, which is
 Copyright (c) 2008-2012 TrueCrypt Developers Association and which is governed
 by the TrueCrypt License 3.0.

 Modifications and additions to the original source code (contained in this file)
 and all other portions of this file are Copyright (c) 2013-2017 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.
*/

#ifndef TC_HEADER_Boot_Bios
#define TC_HEADER_Boot_Bios

#include "Platform.h"

#define TC_LB_SIZE_BIT_SHIFT_DIVISOR 9

#define TC_FIRST_BIOS_DRIVE 0x80
#define TC_LAST_BIOS_DRIVE 0x8f
#define TC_INVALID_BIOS_DRIVE (TC_FIRST_BIOS_DRIVE - 1)

enum
{
	BiosResultSuccess = 0x00,
	BiosResultInvalidFunction = 0x01,
	BiosResultTimeout = 0x80
};

typedef uint8 BiosResult;

#endif // TC_HEADER_Boot_Bios
d 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) 2013-2015 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 cacheEmpty = 1; static int nPasswordIdx = 0; int ReadVolumeHeaderWCache (BOOL bBoot, BOOL bCache, char *header, Password *password, int pkcs5_prf, int pim, BOOL truecryptMode, 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, 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; /* 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, pim, truecryptMode, 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; }