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Windows: Better implementation of PRF autodetection optimization.

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This commit is contained in:
Mounir IDRASSI
2021-08-07 20:44:00 +02:00
parent aeba32ba8b
commit 4b98ff0e98
3 changed files with 80 additions and 54 deletions
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87
src/Common/Volumes.c
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@@ -170,7 +170,10 @@ BOOL ReadVolumeHeaderRecoveryMode = FALSE;
int ReadVolumeHeader (BOOL bBoot, char *encryptedHeader, Password *password, int selected_pkcs5_prf, int pim, BOOL truecryptMode, PCRYPTO_INFO *retInfo, CRYPTO_INFO *retHeaderCryptoInfo)
{
char header[TC_VOLUME_HEADER_EFFECTIVE_SIZE];
CRYPTOPP_ALIGN_DATA(16) KEY_INFO keyInfo;
unsigned char* keyInfoBuffer = NULL;
int keyInfoBufferSize = sizeof (KEY_INFO) + 16;
size_t keyInfoBufferOffset;
PKEY_INFO keyInfo;
PCRYPTO_INFO cryptoInfo;
CRYPTOPP_ALIGN_DATA(16) char dk[MASTER_KEYDATA_SIZE];
int enqPkcs5Prf, pkcs5_prf;
@@ -182,6 +185,7 @@ int ReadVolumeHeader (BOOL bBoot, char *encryptedHeader, Password *password, int
TC_EVENT *keyDerivationCompletedEvent = NULL;
TC_EVENT *noOutstandingWorkItemEvent = NULL;
KeyDerivationWorkItem *keyDerivationWorkItems = NULL;
int keyDerivationWorkItemsSize = 0;
KeyDerivationWorkItem *item;
size_t encryptionThreadCount = GetEncryptionThreadCount();
LONG *outstandingWorkItemCount = NULL;
@@ -189,6 +193,17 @@ int ReadVolumeHeader (BOOL bBoot, char *encryptedHeader, Password *password, int
#endif
size_t queuedWorkItems = 0;
// allocate 16-bytes aligned buffer to hold KEY_INFO in a portable way
keyInfoBuffer = TCalloc(keyInfoBufferSize);
if (!keyInfoBuffer)
return ERR_OUTOFMEMORY;
keyInfoBufferOffset = 16 - (((uint64) keyInfoBuffer) % 16);
keyInfo = (PKEY_INFO) (keyInfoBuffer + keyInfoBufferOffset);
#if !defined(DEVICE_DRIVER) && !defined(_UEFI)
VirtualLock (keyInfoBuffer, keyInfoBufferSize);
#endif
// if no PIM specified, use default value
if (pim < 0)
pim = 0;
@@ -237,7 +252,8 @@ int ReadVolumeHeader (BOOL bBoot, char *encryptedHeader, Password *password, int
return ERR_OUTOFMEMORY;
}
keyDerivationWorkItems = TCalloc (sizeof (KeyDerivationWorkItem) * pkcs5PrfCount);
keyDerivationWorkItemsSize = sizeof (KeyDerivationWorkItem) * pkcs5PrfCount;
keyDerivationWorkItems = TCalloc (keyDerivationWorkItemsSize);
if (!keyDerivationWorkItems)
{
TCfree(keyDerivationCompletedEvent);
@@ -274,20 +290,21 @@ int ReadVolumeHeader (BOOL bBoot, char *encryptedHeader, Password *password, int
TCfree(outstandingWorkItemCount);
return ERR_OUTOFMEMORY;
}
VirtualLock (keyDerivationWorkItems, keyDerivationWorkItemsSize);
#endif
}
#if !defined(DEVICE_DRIVER)
VirtualLock (&keyInfo, sizeof (keyInfo));
VirtualLock (&dk, sizeof (dk));
VirtualLock (&header, sizeof (header));
#endif
#endif // !defined(_UEFI)
crypto_loadkey (&keyInfo, password->Text, (int) password->Length);
crypto_loadkey (keyInfo, password->Text, (int) password->Length);
// PKCS5 is used to derive the primary header key(s) and secondary header key(s) (XTS mode) from the password
memcpy (keyInfo.salt, encryptedHeader + HEADER_SALT_OFFSET, PKCS5_SALT_SIZE);
memcpy (keyInfo->salt, encryptedHeader + HEADER_SALT_OFFSET, PKCS5_SALT_SIZE);
// Test all available PKCS5 PRFs
for (enqPkcs5Prf = FIRST_PRF_ID; enqPkcs5Prf <= LAST_PRF_ID || queuedWorkItems > 0; ++enqPkcs5Prf)
@@ -315,8 +332,8 @@ int ReadVolumeHeader (BOOL bBoot, char *encryptedHeader, Password *password, int
item->Pkcs5Prf = enqPkcs5Prf;
EncryptionThreadPoolBeginKeyDerivation (keyDerivationCompletedEvent, noOutstandingWorkItemEvent,
&item->KeyReady, outstandingWorkItemCount, enqPkcs5Prf, keyInfo.userKey,
keyInfo.keyLength, keyInfo.salt, get_pkcs5_iteration_count (enqPkcs5Prf, pim, truecryptMode, bBoot), item->DerivedKey);
&item->KeyReady, outstandingWorkItemCount, enqPkcs5Prf, keyInfo->userKey,
keyInfo->keyLength, keyInfo->salt, get_pkcs5_iteration_count (enqPkcs5Prf, pim, truecryptMode, bBoot), item->DerivedKey);
++queuedWorkItems;
break;
@@ -338,7 +355,7 @@ int ReadVolumeHeader (BOOL bBoot, char *encryptedHeader, Password *password, int
if (!item->Free && InterlockedExchangeAdd (&item->KeyReady, 0) == TRUE)
{
pkcs5_prf = item->Pkcs5Prf;
keyInfo.noIterations = get_pkcs5_iteration_count (pkcs5_prf, pim, truecryptMode, bBoot);
keyInfo->noIterations = get_pkcs5_iteration_count (pkcs5_prf, pim, truecryptMode, bBoot);
memcpy (dk, item->DerivedKey, sizeof (dk));
item->Free = TRUE;
@@ -357,33 +374,33 @@ KeyReady: ;
#endif // !defined(_UEFI)
{
pkcs5_prf = enqPkcs5Prf;
keyInfo.noIterations = get_pkcs5_iteration_count (enqPkcs5Prf, pim, truecryptMode, bBoot);
keyInfo->noIterations = get_pkcs5_iteration_count (enqPkcs5Prf, pim, truecryptMode, bBoot);
switch (pkcs5_prf)
{
case RIPEMD160:
derive_key_ripemd160 (keyInfo.userKey, keyInfo.keyLength, keyInfo.salt,
PKCS5_SALT_SIZE, keyInfo.noIterations, dk, GetMaxPkcs5OutSize());
derive_key_ripemd160 (keyInfo->userKey, keyInfo->keyLength, keyInfo->salt,
PKCS5_SALT_SIZE, keyInfo->noIterations, dk, GetMaxPkcs5OutSize());
break;
case SHA512:
derive_key_sha512 (keyInfo.userKey, keyInfo.keyLength, keyInfo.salt,
PKCS5_SALT_SIZE, keyInfo.noIterations, dk, GetMaxPkcs5OutSize());
derive_key_sha512 (keyInfo->userKey, keyInfo->keyLength, keyInfo->salt,
PKCS5_SALT_SIZE, keyInfo->noIterations, dk, GetMaxPkcs5OutSize());
break;
case WHIRLPOOL:
derive_key_whirlpool (keyInfo.userKey, keyInfo.keyLength, keyInfo.salt,
PKCS5_SALT_SIZE, keyInfo.noIterations, dk, GetMaxPkcs5OutSize());
derive_key_whirlpool (keyInfo->userKey, keyInfo->keyLength, keyInfo->salt,
PKCS5_SALT_SIZE, keyInfo->noIterations, dk, GetMaxPkcs5OutSize());
break;
case SHA256:
derive_key_sha256 (keyInfo.userKey, keyInfo.keyLength, keyInfo.salt,
PKCS5_SALT_SIZE, keyInfo.noIterations, dk, GetMaxPkcs5OutSize());
derive_key_sha256 (keyInfo->userKey, keyInfo->keyLength, keyInfo->salt,
PKCS5_SALT_SIZE, keyInfo->noIterations, dk, GetMaxPkcs5OutSize());
break;
case STREEBOG:
derive_key_streebog(keyInfo.userKey, keyInfo.keyLength, keyInfo.salt,
PKCS5_SALT_SIZE, keyInfo.noIterations, dk, GetMaxPkcs5OutSize());
derive_key_streebog(keyInfo->userKey, keyInfo->keyLength, keyInfo->salt,
PKCS5_SALT_SIZE, keyInfo->noIterations, dk, GetMaxPkcs5OutSize());
break;
default:
// Unknown/wrong ID
@@ -540,7 +557,7 @@ KeyReady: ;
if (retInfo == NULL)
{
cryptoInfo->pkcs5 = pkcs5_prf;
cryptoInfo->noIterations = keyInfo.noIterations;
cryptoInfo->noIterations = keyInfo->noIterations;
cryptoInfo->bTrueCryptMode = truecryptMode;
cryptoInfo->volumePim = pim;
goto ret;
@@ -557,34 +574,34 @@ KeyReady: ;
}
// Master key data
memcpy (keyInfo.master_keydata, header + HEADER_MASTER_KEYDATA_OFFSET, MASTER_KEYDATA_SIZE);
memcpy (keyInfo->master_keydata, header + HEADER_MASTER_KEYDATA_OFFSET, MASTER_KEYDATA_SIZE);
#ifdef TC_WINDOWS_DRIVER
{
RMD160_CTX ctx;
RMD160Init (&ctx);
RMD160Update (&ctx, keyInfo.master_keydata, MASTER_KEYDATA_SIZE);
RMD160Update (&ctx, keyInfo->master_keydata, MASTER_KEYDATA_SIZE);
RMD160Update (&ctx, header, sizeof(header));
RMD160Final (cryptoInfo->master_keydata_hash, &ctx);
burn(&ctx, sizeof (ctx));
}
#else
memcpy (cryptoInfo->master_keydata, keyInfo.master_keydata, MASTER_KEYDATA_SIZE);
memcpy (cryptoInfo->master_keydata, keyInfo->master_keydata, MASTER_KEYDATA_SIZE);
#endif
// PKCS #5
cryptoInfo->pkcs5 = pkcs5_prf;
cryptoInfo->noIterations = keyInfo.noIterations;
cryptoInfo->noIterations = keyInfo->noIterations;
cryptoInfo->bTrueCryptMode = truecryptMode;
cryptoInfo->volumePim = pim;
// Init the cipher with the decrypted master key
status = EAInit (cryptoInfo->ea, keyInfo.master_keydata + primaryKeyOffset, cryptoInfo->ks);
status = EAInit (cryptoInfo->ea, keyInfo->master_keydata + primaryKeyOffset, cryptoInfo->ks);
if (status == ERR_CIPHER_INIT_FAILURE)
goto err;
#ifndef TC_WINDOWS_DRIVER
// The secondary master key (if cascade, multiple concatenated)
memcpy (cryptoInfo->k2, keyInfo.master_keydata + EAGetKeySize (cryptoInfo->ea), EAGetKeySize (cryptoInfo->ea));
memcpy (cryptoInfo->k2, keyInfo->master_keydata + EAGetKeySize (cryptoInfo->ea), EAGetKeySize (cryptoInfo->ea));
#endif
if (!EAInitMode (cryptoInfo, keyInfo.master_keydata + EAGetKeySize (cryptoInfo->ea)))
if (!EAInitMode (cryptoInfo, keyInfo->master_keydata + EAGetKeySize (cryptoInfo->ea)))
{
status = ERR_MODE_INIT_FAILED;
goto err;
@@ -604,13 +621,11 @@ err:
*retInfo = NULL;
}
ret:
burn (&keyInfo, sizeof (keyInfo));
ret:
burn (dk, sizeof(dk));
burn (header, sizeof(header));
#if !defined(DEVICE_DRIVER) && !defined(_UEFI)
VirtualUnlock (&keyInfo, sizeof (keyInfo));
VirtualUnlock (&dk, sizeof (dk));
VirtualUnlock (&header, sizeof (header));
#endif
@@ -618,9 +633,19 @@ ret:
#if !defined(_UEFI)
if ((selected_pkcs5_prf == 0) && (encryptionThreadCount > 1))
{
EncryptionThreadPoolBeginReadVolumeHeaderFinalization (keyDerivationCompletedEvent, noOutstandingWorkItemEvent, outstandingWorkItemCount, keyDerivationWorkItems, sizeof (KeyDerivationWorkItem) * pkcs5PrfCount);
EncryptionThreadPoolBeginReadVolumeHeaderFinalization (keyDerivationCompletedEvent, noOutstandingWorkItemEvent, outstandingWorkItemCount,
keyInfoBuffer, keyInfoBufferSize,
keyDerivationWorkItems, keyDerivationWorkItemsSize);
}
else
#endif
{
burn (keyInfo, sizeof (KEY_INFO));
#if !defined(DEVICE_DRIVER) && !defined(_UEFI)
VirtualUnlock (keyInfoBuffer, keyInfoBufferSize);
#endif
TCfree(keyInfoBuffer);
}
return status;
}