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Annotation of truecrypt/common/cache.c, revision 1.1

1.1     ! root        1: /* Copyright (C) 2004 TrueCrypt Team, truecrypt.org
        !             2:    This product uses components written by Paul Le Roux <[email protected]> */
        !             3: 
        !             4: #include "tcdefs.h"
        !             5: 
        !             6: #ifndef NT4_DRIVER
        !             7: #pragma VxD_LOCKED_CODE_SEG
        !             8: #pragma VxD_LOCKED_DATA_SEG
        !             9: #endif
        !            10: 
        !            11: #include "crypto.h"
        !            12: #include "fat.h"
        !            13: #include "volumes.h"
        !            14: #include "apidrvr.h"
        !            15: 
        !            16: #include "cache.h"
        !            17: 
        !            18: #define CACHE_SIZE 4
        !            19: 
        !            20: char szDriverPassword[CACHE_SIZE][MAX_PASSWORD + 1];
        !            21: int nDriverPasswordLen[CACHE_SIZE];
        !            22: int nPasswordIdx = 0;
        !            23: int cacheEmpty = 1;
        !            24: 
        !            25: int
        !            26: VolumeReadHeaderCache (BOOL bCache, char *dev, char *lpszPassword, int nPasswordLen,
        !            27:                       PCRYPTO_INFO * retInfo)
        !            28: {
        !            29:        int nReturnCode = ERR_PASSWORD_WRONG;
        !            30:        int i;
        !            31: 
        !            32:        /* Attempt to recognize volume using mount password */
        !            33:        if (nPasswordLen > 0)
        !            34:        {
        !            35:                nReturnCode = VolumeReadHeader (dev, lpszPassword, retInfo);
        !            36: 
        !            37:                /* Save mount passwords back into cache if asked to do so */
        !            38:                if (bCache == TRUE && nReturnCode == 0)
        !            39:                {
        !            40:                        for (i = 0; i < CACHE_SIZE; i++)
        !            41:                        {
        !            42:                                if (nDriverPasswordLen[i] > 0 && nDriverPasswordLen[i] == nPasswordLen &&
        !            43:                                        memcmp (szDriverPassword[i], lpszPassword, nPasswordLen) == 0)
        !            44:                                        break;
        !            45:                        }
        !            46: 
        !            47:                        if (i == CACHE_SIZE)
        !            48:                        {
        !            49:                                /* Store the password */
        !            50:                                memcpy (szDriverPassword[nPasswordIdx], lpszPassword, nPasswordLen);
        !            51: 
        !            52:                                /* Add in the null as we made room for this */
        !            53:                                szDriverPassword[nPasswordIdx][nPasswordLen] = 0;
        !            54: 
        !            55:                                /* Save the length for later */
        !            56:                                nDriverPasswordLen[nPasswordIdx] = nPasswordLen;
        !            57: 
        !            58:                                /* Try another slot */
        !            59:                                nPasswordIdx = (nPasswordIdx + 1) % CACHE_SIZE;
        !            60: 
        !            61:                                cacheEmpty = 0;
        !            62:                        }
        !            63:                }
        !            64:        }
        !            65:        else if (!cacheEmpty)
        !            66:        {
        !            67:                /* Attempt to recognize volume using cached passwords */
        !            68:                for (i = 0; i < CACHE_SIZE; i++)
        !            69:                {
        !            70:                        if (nDriverPasswordLen[i] > 0)
        !            71:                        {
        !            72:                                nReturnCode = VolumeReadHeader (dev, szDriverPassword[i], retInfo);
        !            73: 
        !            74:                                if (nReturnCode != ERR_PASSWORD_WRONG)
        !            75:                                        break;
        !            76:                        }
        !            77: 
        !            78:                }
        !            79:        }
        !            80: 
        !            81:        return nReturnCode;
        !            82: }
        !            83: 
        !            84: void
        !            85: WipeCache ()
        !            86: {
        !            87:        burn (szDriverPassword, sizeof (szDriverPassword));
        !            88:        burn (nDriverPasswordLen, sizeof (nDriverPasswordLen));
        !            89:        nPasswordIdx = 0;
        !            90:        cacheEmpty = 1;
        !            91: }

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