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Sweden-Number/dlls/crypt32/protectdata.c

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/*
* Copyright 2005 Kees Cook <kees@outflux.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
/*
* The Win32 CryptProtectData and CryptUnprotectData functions are meant
* to provide a mechanism for encrypting data on a machine where other users
* of the system can't be trusted. It is used in many examples as a way
* to store username and password information to the registry, but store
* it not in the clear.
*
* The encryption is symmetric, but the method is unknown. However, since
* it is keyed to the machine and the user, it is unlikely that the values
* would be portable. Since programs must first call CryptProtectData to
* get a cipher text, the underlying system doesn't have to exactly
* match the real Windows version. However, attempts have been made to
* at least try to look like the Windows version, including guesses at the
* purpose of various portions of the "opaque data blob" that is used.
*
*/
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "windef.h"
#include "winbase.h"
#include "wincrypt.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(crypt);
#define CRYPT32_PROTECTDATA_PROV PROV_RSA_FULL
#define CRYPT32_PROTECTDATA_HASH_CALG CALG_SHA1
#define CRYPT32_PROTECTDATA_HASH_LEN 160
#define CRYPT32_PROTECTDATA_KEY_CALG CALG_3DES
#define CRYPT32_PROTECTDATA_KEY_LEN 168
#define CRYPT32_PROTECTDATA_SALT_LEN 16
static const BYTE crypt32_protectdata_secret[] = {
'I','\'','m',' ','h','u','n','t','i','n','g',' ',
'w','a','b','b','i','t','s',0
};
/*
* The data format returned by the real Windows CryptProtectData seems
* to be something like this:
DWORD count0; - how many "info0_*[16]" blocks follow (was always 1)
BYTE info0_0[16]; - unknown information - persistent across invocations,
... reboots, password changes, and users
DWORD count1; - how many "info1_*[16]" blocks follow (was always 1)
BYTE info1_0[16]; - unknown information - unique to each user, but
... persistent across reboots and password changes
DWORD null0; - NULL "end of records"?
DWORD str_len; - byte length of WCHAR string including term
BYTE str[str_len]; - The "dataDescription" value as a NULL-terminated
little-endian WCHAR string
ALG_ID cipher_alg; - cipher algo - was CALG_3DES
DWORD cipher_key_len; - cipher key bit length - was 0xa8==168
DWORD data_len; - length of data (was 16 in samples)
BYTE data[data_len]; - unknown data (fingerprint?)
DWORD null1; - NULL ?
ALG_ID hash_alg; - hash algo - was CALG_SHA1
DWORD hash_len; - bit length of hash - was 0xa0==160
DWORD salt_len; - length of salt(?) data
BYTE salt[salt_len]; - salt(?) for symmetric encryption
DWORD cipher_len; - length of cipher(?) data - was close to plain len
BYTE cipher[cipher_len]; - cipher text?
DWORD crc_len; - length of fingerprint(?) data - was 20 byte==160b SHA1
BYTE crc[crc_len]; - fingerprint of record?
* The data structures used in Wine are modelled after this guess.
*/
struct protect_data_t
{
DWORD count0;
DATA_BLOB info0; /* using this to hold crypt_magic_str */
DWORD count1;
DATA_BLOB info1;
DWORD null0;
WCHAR * szDataDescr; /* serialized differently than the DATA_BLOBs */
ALG_ID cipher_alg;
DWORD cipher_key_len;
DATA_BLOB data0;
DWORD null1;
ALG_ID hash_alg;
DWORD hash_len;
DATA_BLOB salt;
DATA_BLOB cipher;
DATA_BLOB fingerprint;
};
/* this is used to check if an incoming structure was built by Wine */
static const char crypt_magic_str[] = "Wine Crypt32 ok";
/* debugging tool to print strings of hex chars */
static const char *
hex_str(const unsigned char *p, int n)
{
const char * ptr;
char report[80];
int r=-1;
report[0]='\0';
ptr = wine_dbg_sprintf("%s","");
while (--n >= 0)
{
if (r++ % 20 == 19)
{
ptr = wine_dbg_sprintf("%s%s",ptr,report);
report[0]='\0';
}
sprintf(report+strlen(report),"%s%02x", r ? "," : "", *p++);
}
return wine_dbg_sprintf("%s%s",ptr,report);
}
#define TRACE_DATA_BLOB(blob) do { \
TRACE("%s cbData: %u\n", #blob ,(unsigned int)((blob)->cbData)); \
TRACE("%s pbData @ %p:%s\n", #blob ,(blob)->pbData, \
hex_str((blob)->pbData, (blob)->cbData)); \
} while (0)
static
void serialize_dword(DWORD value,BYTE ** ptr)
{
/*TRACE("called\n");*/
memcpy(*ptr,&value,sizeof(DWORD));
*ptr+=sizeof(DWORD);
}
static
void serialize_string(const BYTE *str, BYTE **ptr, DWORD len, DWORD width,
BOOL prepend_len)
{
/*TRACE("called %ux%u\n",(unsigned int)len,(unsigned int)width);*/
if (prepend_len)
{
serialize_dword(len,ptr);
}
memcpy(*ptr,str,len*width);
*ptr+=len*width;
}
static
BOOL unserialize_dword(const BYTE *ptr, DWORD *index, DWORD size, DWORD *value)
{
/*TRACE("called\n");*/
if (!ptr || !index || !value) return FALSE;
if (*index+sizeof(DWORD)>size)
{
return FALSE;
}
memcpy(value,&(ptr[*index]),sizeof(DWORD));
*index+=sizeof(DWORD);
return TRUE;
}
static
BOOL unserialize_string(const BYTE *ptr, DWORD *index, DWORD size,
DWORD len, DWORD width, BOOL inline_len,
BYTE ** data, DWORD * stored)
{
/*TRACE("called\n");*/
if (!ptr || !data) return FALSE;
if (inline_len) {
if (!unserialize_dword(ptr,index,size,&len))
return FALSE;
}
if (*index+len*width>size)
{
return FALSE;
}
if (!(*data = CryptMemAlloc( len*width)))
{
return FALSE;
}
memcpy(*data,&(ptr[*index]),len*width);
if (stored)
{
*stored = len;
}
*index+=len*width;
return TRUE;
}
static
BOOL serialize(const struct protect_data_t *pInfo, DATA_BLOB *pSerial)
{
BYTE * ptr;
DWORD dwStrLen;
DWORD dwStruct;
TRACE("called\n");
if (!pInfo || !pInfo->szDataDescr || !pSerial ||
!pInfo->info0.pbData || !pInfo->info1.pbData ||
!pInfo->data0.pbData || !pInfo->salt.pbData ||
!pInfo->cipher.pbData || !pInfo->fingerprint.pbData)
{
return FALSE;
}
if (pInfo->info0.cbData!=16)
{
ERR("protect_data_t info0 not 16 bytes long\n");
}
if (pInfo->info1.cbData!=16)
{
ERR("protect_data_t info1 not 16 bytes long\n");
}
dwStrLen=lstrlenW(pInfo->szDataDescr);
pSerial->cbData=0;
pSerial->cbData+=sizeof(DWORD)*8; /* 8 raw DWORDs */
pSerial->cbData+=sizeof(DWORD)*4; /* 4 BLOBs with size */
pSerial->cbData+=pInfo->info0.cbData;
pSerial->cbData+=pInfo->info1.cbData;
pSerial->cbData+=(dwStrLen+1)*sizeof(WCHAR) + 4; /* str, null, size */
pSerial->cbData+=pInfo->data0.cbData;
pSerial->cbData+=pInfo->salt.cbData;
pSerial->cbData+=pInfo->cipher.cbData;
pSerial->cbData+=pInfo->fingerprint.cbData;
/* save the actual structure size */
dwStruct = pSerial->cbData;
/* There may be a 256 byte minimum, but I can't prove it. */
/*if (pSerial->cbData<256) pSerial->cbData=256;*/
pSerial->pbData=LocalAlloc(LPTR,pSerial->cbData);
if (!pSerial->pbData) return FALSE;
ptr=pSerial->pbData;
/* count0 */
serialize_dword(pInfo->count0,&ptr);
/*TRACE("used %u\n",ptr-pSerial->pbData);*/
/* info0 */
serialize_string(pInfo->info0.pbData,&ptr,
pInfo->info0.cbData,sizeof(BYTE),FALSE);
/*TRACE("used %u\n",ptr-pSerial->pbData);*/
/* count1 */
serialize_dword(pInfo->count1,&ptr);
/*TRACE("used %u\n",ptr-pSerial->pbData);*/
/* info1 */
serialize_string(pInfo->info1.pbData,&ptr,
pInfo->info1.cbData,sizeof(BYTE),FALSE);
/*TRACE("used %u\n",ptr-pSerial->pbData);*/
/* null0 */
serialize_dword(pInfo->null0,&ptr);
/*TRACE("used %u\n",ptr-pSerial->pbData);*/
/* szDataDescr */
serialize_string((BYTE*)pInfo->szDataDescr,&ptr,
(dwStrLen+1)*sizeof(WCHAR),sizeof(BYTE),TRUE);
/*TRACE("used %u\n",ptr-pSerial->pbData);*/
/* cipher_alg */
serialize_dword(pInfo->cipher_alg,&ptr);
/*TRACE("used %u\n",ptr-pSerial->pbData);*/
/* cipher_key_len */
serialize_dword(pInfo->cipher_key_len,&ptr);
/*TRACE("used %u\n",ptr-pSerial->pbData);*/
/* data0 */
serialize_string(pInfo->data0.pbData,&ptr,
pInfo->data0.cbData,sizeof(BYTE),TRUE);
/*TRACE("used %u\n",ptr-pSerial->pbData);*/
/* null1 */
serialize_dword(pInfo->null1,&ptr);
/*TRACE("used %u\n",ptr-pSerial->pbData);*/
/* hash_alg */
serialize_dword(pInfo->hash_alg,&ptr);
/*TRACE("used %u\n",ptr-pSerial->pbData);*/
/* hash_len */
serialize_dword(pInfo->hash_len,&ptr);
/*TRACE("used %u\n",ptr-pSerial->pbData);*/
/* salt */
serialize_string(pInfo->salt.pbData,&ptr,
pInfo->salt.cbData,sizeof(BYTE),TRUE);
/*TRACE("used %u\n",ptr-pSerial->pbData);*/
/* cipher */
serialize_string(pInfo->cipher.pbData,&ptr,
pInfo->cipher.cbData,sizeof(BYTE),TRUE);
/*TRACE("used %u\n",ptr-pSerial->pbData);*/
/* fingerprint */
serialize_string(pInfo->fingerprint.pbData,&ptr,
pInfo->fingerprint.cbData,sizeof(BYTE),TRUE);
/*TRACE("used %u\n",ptr-pSerial->pbData);*/
if (ptr - pSerial->pbData != dwStruct)
{
ERR("struct size changed!? expected %u\n", dwStruct);
LocalFree(pSerial->pbData);
pSerial->pbData=NULL;
pSerial->cbData=0;
return FALSE;
}
return TRUE;
}
static
BOOL unserialize(const DATA_BLOB *pSerial, struct protect_data_t *pInfo)
{
BYTE * ptr;
DWORD index;
DWORD size;
BOOL status=TRUE;
TRACE("called\n");
if (!pInfo || !pSerial || !pSerial->pbData)
return FALSE;
index=0;
ptr=pSerial->pbData;
size=pSerial->cbData;
/* count0 */
if (!unserialize_dword(ptr,&index,size,&pInfo->count0))
{
ERR("reading count0 failed!\n");
return FALSE;
}
/* info0 */
if (!unserialize_string(ptr,&index,size,16,sizeof(BYTE),FALSE,
&pInfo->info0.pbData, &pInfo->info0.cbData))
{
ERR("reading info0 failed!\n");
return FALSE;
}
/* count1 */
if (!unserialize_dword(ptr,&index,size,&pInfo->count1))
{
ERR("reading count1 failed!\n");
return FALSE;
}
/* info1 */
if (!unserialize_string(ptr,&index,size,16,sizeof(BYTE),FALSE,
&pInfo->info1.pbData, &pInfo->info1.cbData))
{
ERR("reading info1 failed!\n");
return FALSE;
}
/* null0 */
if (!unserialize_dword(ptr,&index,size,&pInfo->null0))
{
ERR("reading null0 failed!\n");
return FALSE;
}
/* szDataDescr */
if (!unserialize_string(ptr,&index,size,0,sizeof(BYTE),TRUE,
(BYTE**)&pInfo->szDataDescr, NULL))
{
ERR("reading szDataDescr failed!\n");
return FALSE;
}
/* cipher_alg */
if (!unserialize_dword(ptr,&index,size,(DWORD*)&pInfo->cipher_alg))
{
ERR("reading cipher_alg failed!\n");
return FALSE;
}
/* cipher_key_len */
if (!unserialize_dword(ptr,&index,size,&pInfo->cipher_key_len))
{
ERR("reading cipher_key_len failed!\n");
return FALSE;
}
/* data0 */
if (!unserialize_string(ptr,&index,size,0,sizeof(BYTE),TRUE,
&pInfo->data0.pbData, &pInfo->data0.cbData))
{
ERR("reading data0 failed!\n");
return FALSE;
}
/* null1 */
if (!unserialize_dword(ptr,&index,size,&pInfo->null1))
{
ERR("reading null1 failed!\n");
return FALSE;
}
/* hash_alg */
if (!unserialize_dword(ptr,&index,size,(DWORD*)&pInfo->hash_alg))
{
ERR("reading hash_alg failed!\n");
return FALSE;
}
/* hash_len */
if (!unserialize_dword(ptr,&index,size,&pInfo->hash_len))
{
ERR("reading hash_len failed!\n");
return FALSE;
}
/* salt */
if (!unserialize_string(ptr,&index,size,0,sizeof(BYTE),TRUE,
&pInfo->salt.pbData, &pInfo->salt.cbData))
{
ERR("reading salt failed!\n");
return FALSE;
}
/* cipher */
if (!unserialize_string(ptr,&index,size,0,sizeof(BYTE),TRUE,
&pInfo->cipher.pbData, &pInfo->cipher.cbData))
{
ERR("reading cipher failed!\n");
return FALSE;
}
/* fingerprint */
if (!unserialize_string(ptr,&index,size,0,sizeof(BYTE),TRUE,
&pInfo->fingerprint.pbData, &pInfo->fingerprint.cbData))
{
ERR("reading fingerprint failed!\n");
return FALSE;
}
/* allow structure size to be too big (since some applications
* will pad this up to 256 bytes, it seems) */
if (index>size)
{
/* this is an impossible-to-reach test, but if the padding
* issue is ever understood, this may become more useful */
ERR("loaded corrupt structure! (used %u expected %u)\n", index, size);
status=FALSE;
}
return status;
}
/* perform sanity checks */
static
BOOL valid_protect_data(const struct protect_data_t *pInfo)
{
BOOL status=TRUE;
TRACE("called\n");
if (pInfo->count0 != 0x0001)
{
ERR("count0 != 0x0001 !\n");
status=FALSE;
}
if (pInfo->count1 != 0x0001)
{
ERR("count0 != 0x0001 !\n");
status=FALSE;
}
if (pInfo->null0 != 0x0000)
{
ERR("null0 != 0x0000 !\n");
status=FALSE;
}
if (pInfo->null1 != 0x0000)
{
ERR("null1 != 0x0000 !\n");
status=FALSE;
}
/* since we have no idea what info0 is used for, and it seems
* rather constant, we can test for a Wine-specific magic string
* there to be reasonably sure we're using data created by the Wine
* implementation of CryptProtectData.
*/
if (pInfo->info0.cbData!=strlen(crypt_magic_str)+1 ||
strcmp( (LPCSTR)pInfo->info0.pbData,crypt_magic_str) != 0)
{
ERR("info0 magic value not matched !\n");
status=FALSE;
}
if (!status)
{
ERR("unrecognized CryptProtectData block\n");
}
return status;
}
static
void free_protect_data(struct protect_data_t * pInfo)
{
TRACE("called\n");
if (!pInfo) return;
CryptMemFree(pInfo->info0.pbData);
CryptMemFree(pInfo->info1.pbData);
CryptMemFree(pInfo->szDataDescr);
CryptMemFree(pInfo->data0.pbData);
CryptMemFree(pInfo->salt.pbData);
CryptMemFree(pInfo->cipher.pbData);
CryptMemFree(pInfo->fingerprint.pbData);
}
/* copies a string into a data blob */
static
BYTE *convert_str_to_blob(LPCSTR str, DATA_BLOB *blob)
{
if (!str || !blob) return NULL;
blob->cbData=strlen(str)+1;
if (!(blob->pbData=CryptMemAlloc(blob->cbData)))
{
blob->cbData=0;
}
else {
strcpy((LPSTR)blob->pbData, str);
}
return blob->pbData;
}
/*
* Populates everything except "cipher" and "fingerprint".
*/
static
BOOL fill_protect_data(struct protect_data_t * pInfo, LPCWSTR szDataDescr,
HCRYPTPROV hProv)
{
DWORD dwStrLen;
TRACE("called\n");
if (!pInfo) return FALSE;
dwStrLen=lstrlenW(szDataDescr);
memset(pInfo,0,sizeof(*pInfo));
pInfo->count0=0x0001;
convert_str_to_blob(crypt_magic_str, &pInfo->info0);
pInfo->count1=0x0001;
convert_str_to_blob(crypt_magic_str, &pInfo->info1);
pInfo->null0=0x0000;
if ((pInfo->szDataDescr=CryptMemAlloc((dwStrLen+1)*sizeof(WCHAR))))
{
memcpy(pInfo->szDataDescr,szDataDescr,(dwStrLen+1)*sizeof(WCHAR));
}
pInfo->cipher_alg=CRYPT32_PROTECTDATA_KEY_CALG;
pInfo->cipher_key_len=CRYPT32_PROTECTDATA_KEY_LEN;
convert_str_to_blob(crypt_magic_str, &pInfo->data0);
pInfo->null1=0x0000;
pInfo->hash_alg=CRYPT32_PROTECTDATA_HASH_CALG;
pInfo->hash_len=CRYPT32_PROTECTDATA_HASH_LEN;
/* allocate memory to hold a salt */
if ((pInfo->salt.pbData=CryptMemAlloc(CRYPT32_PROTECTDATA_SALT_LEN)))
{
/* generate random salt */
if (!CryptGenRandom(hProv, CRYPT32_PROTECTDATA_SALT_LEN, pInfo->salt.pbData))
{
ERR("CryptGenRandom\n");
free_protect_data(pInfo);
return FALSE;
}
pInfo->salt.cbData=CRYPT32_PROTECTDATA_SALT_LEN;
/* debug: show our salt */
TRACE_DATA_BLOB(&pInfo->salt);
}
pInfo->cipher.cbData=0;
pInfo->cipher.pbData=NULL;
pInfo->fingerprint.cbData=0;
pInfo->fingerprint.pbData=NULL;
/* check all the allocations at once */
if (!pInfo->info0.pbData ||
!pInfo->info1.pbData ||
!pInfo->szDataDescr ||
!pInfo->data0.pbData ||
!pInfo->salt.pbData
)
{
ERR("could not allocate protect_data structures\n");
free_protect_data(pInfo);
return FALSE;
}
return TRUE;
}
static
BOOL convert_hash_to_blob(HCRYPTHASH hHash, DATA_BLOB * blob)
{
DWORD dwSize;
TRACE("called\n");
if (!blob) return FALSE;
dwSize=sizeof(DWORD);
if (!CryptGetHashParam(hHash, HP_HASHSIZE, (BYTE*)&blob->cbData,
&dwSize, 0))
{
ERR("failed to get hash size\n");
return FALSE;
}
if (!(blob->pbData=CryptMemAlloc(blob->cbData)))
{
ERR("failed to allocate blob memory\n");
return FALSE;
}
dwSize=blob->cbData;
if (!CryptGetHashParam(hHash, HP_HASHVAL, blob->pbData, &dwSize, 0))
{
ERR("failed to get hash value\n");
CryptMemFree(blob->pbData);
blob->pbData=NULL;
blob->cbData=0;
return FALSE;
}
return TRUE;
}
/* test that a given hash matches an exported-to-blob hash value */
static
BOOL hash_matches_blob(HCRYPTHASH hHash, const DATA_BLOB *two)
{
BOOL rc = FALSE;
DATA_BLOB one;
if (!two || !two->pbData) return FALSE;
if (!convert_hash_to_blob(hHash,&one)) {
return FALSE;
}
if ( one.cbData == two->cbData &&
memcmp( one.pbData, two->pbData, one.cbData ) == 0 )
{
rc = TRUE;
}
CryptMemFree(one.pbData);
return rc;
}
/* create an encryption key from a given salt and optional entropy */
static
BOOL load_encryption_key(HCRYPTPROV hProv, DWORD key_len, const DATA_BLOB *salt,
const DATA_BLOB *pOptionalEntropy, HCRYPTKEY *phKey)
{
BOOL rc = TRUE;
HCRYPTHASH hSaltHash;
char * szUsername = NULL;
DWORD dwUsernameLen;
DWORD dwError;
/* create hash for salt */
if (!salt || !phKey ||
!CryptCreateHash(hProv,CRYPT32_PROTECTDATA_HASH_CALG,0,0,&hSaltHash))
{
ERR("CryptCreateHash\n");
return FALSE;
}
/* This should be the "logon credentials" instead of username */
dwError=GetLastError();
dwUsernameLen = 0;
if (!GetUserNameA(NULL, &dwUsernameLen) &&
GetLastError() == ERROR_INSUFFICIENT_BUFFER && dwUsernameLen &&
(szUsername = CryptMemAlloc(dwUsernameLen)))
{
szUsername[0]='\0';
GetUserNameA( szUsername, &dwUsernameLen );
}
SetLastError(dwError);
/* salt the hash with:
* - the user id
* - an "internal secret"
* - randomness (from the salt)
* - user-supplied entropy
*/
if ((szUsername && !CryptHashData(hSaltHash,(LPBYTE)szUsername,dwUsernameLen,0)) ||
!CryptHashData(hSaltHash,crypt32_protectdata_secret,
sizeof(crypt32_protectdata_secret)-1,0) ||
!CryptHashData(hSaltHash,salt->pbData,salt->cbData,0) ||
(pOptionalEntropy && !CryptHashData(hSaltHash,
pOptionalEntropy->pbData,
pOptionalEntropy->cbData,0)))
{
ERR("CryptHashData\n");
rc = FALSE;
}
/* produce a symmetric key */
if (rc && !CryptDeriveKey(hProv,CRYPT32_PROTECTDATA_KEY_CALG,
hSaltHash,key_len << 16 | CRYPT_EXPORTABLE,phKey))
{
ERR("CryptDeriveKey\n");
rc = FALSE;
}
/* clean up */
CryptDestroyHash(hSaltHash);
CryptMemFree(szUsername);
return rc;
}
/* debugging tool to print the structures of a ProtectData call */
static void
report(const DATA_BLOB* pDataIn, const DATA_BLOB* pOptionalEntropy,
CRYPTPROTECT_PROMPTSTRUCT* pPromptStruct, DWORD dwFlags)
{
TRACE("pPromptStruct: %p\n", pPromptStruct);
if (pPromptStruct)
{
TRACE(" cbSize: 0x%x\n", pPromptStruct->cbSize);
TRACE(" dwPromptFlags: 0x%x\n", pPromptStruct->dwPromptFlags);
TRACE(" hwndApp: %p\n", pPromptStruct->hwndApp);
TRACE(" szPrompt: %p %s\n",
pPromptStruct->szPrompt,
pPromptStruct->szPrompt ? debugstr_w(pPromptStruct->szPrompt)
: "");
}
TRACE("dwFlags: 0x%04x\n", dwFlags);
TRACE_DATA_BLOB(pDataIn);
if (pOptionalEntropy)
{
TRACE_DATA_BLOB(pOptionalEntropy);
TRACE(" %s\n",debugstr_an((LPCSTR)pOptionalEntropy->pbData,pOptionalEntropy->cbData));
}
}
/***************************************************************************
* CryptProtectData [CRYPT32.@]
*
* Generate Cipher data from given Plain and Entropy data.
*
* PARAMS
* pDataIn [I] Plain data to be enciphered
* szDataDescr [I] Optional Unicode string describing the Plain data
* pOptionalEntropy [I] Optional entropy data to adjust cipher, can be NULL
* pvReserved [I] Reserved, must be NULL
* pPromptStruct [I] Structure describing if/how to prompt during ciphering
* dwFlags [I] Flags describing options to the ciphering
* pDataOut [O] Resulting Cipher data, for calls to CryptUnprotectData
*
* RETURNS
* TRUE If a Cipher was generated.
* FALSE If something failed and no Cipher is available.
*
* FIXME
* The true Windows encryption and keying mechanisms are unknown.
*
* dwFlags and pPromptStruct are currently ignored.
*
* NOTES
* Memory allocated in pDataOut must be freed with LocalFree.
*
*/
BOOL WINAPI CryptProtectData(DATA_BLOB* pDataIn,
LPCWSTR szDataDescr,
DATA_BLOB* pOptionalEntropy,
PVOID pvReserved,
CRYPTPROTECT_PROMPTSTRUCT* pPromptStruct,
DWORD dwFlags,
DATA_BLOB* pDataOut)
{
BOOL rc = FALSE;
HCRYPTPROV hProv;
struct protect_data_t protect_data;
HCRYPTHASH hHash;
HCRYPTKEY hKey;
DWORD dwLength;
TRACE("called\n");
SetLastError(ERROR_SUCCESS);
if (!pDataIn || !pDataOut)
{
SetLastError(ERROR_INVALID_PARAMETER);
goto finished;
}
/* debug: show our arguments */
report(pDataIn,pOptionalEntropy,pPromptStruct,dwFlags);
TRACE("\tszDataDescr: %p %s\n", szDataDescr,
szDataDescr ? debugstr_w(szDataDescr) : "");
/* Windows appears to create an empty szDataDescr instead of maintaining
* a NULL */
if (!szDataDescr)
szDataDescr = L"";
/* get crypt context */
if (!CryptAcquireContextW(&hProv,NULL,MS_ENHANCED_PROV_W,CRYPT32_PROTECTDATA_PROV,CRYPT_VERIFYCONTEXT))
{
ERR("CryptAcquireContextW failed\n");
goto finished;
}
/* populate our structure */
if (!fill_protect_data(&protect_data,szDataDescr,hProv))
{
ERR("fill_protect_data\n");
goto free_context;
}
/* load key */
if (!load_encryption_key(hProv,protect_data.cipher_key_len,&protect_data.salt,pOptionalEntropy,&hKey))
{
goto free_protect_data;
}
/* create a hash for the encryption validation */
if (!CryptCreateHash(hProv,CRYPT32_PROTECTDATA_HASH_CALG,0,0,&hHash))
{
ERR("CryptCreateHash\n");
goto free_key;
}
/* calculate storage required */
dwLength=pDataIn->cbData;
if (CryptEncrypt(hKey, 0, TRUE, 0, pDataIn->pbData, &dwLength, 0) ||
GetLastError()!=ERROR_MORE_DATA)
{
ERR("CryptEncrypt\n");
goto free_hash;
}
TRACE("required encrypted storage: %u\n", dwLength);
/* copy plain text into cipher area for CryptEncrypt call */
protect_data.cipher.cbData=dwLength;
if (!(protect_data.cipher.pbData=CryptMemAlloc(
protect_data.cipher.cbData)))
{
ERR("CryptMemAlloc\n");
goto free_hash;
}
memcpy(protect_data.cipher.pbData,pDataIn->pbData,pDataIn->cbData);
/* encrypt! */
dwLength=pDataIn->cbData;
if (!CryptEncrypt(hKey, hHash, TRUE, 0, protect_data.cipher.pbData,
&dwLength, protect_data.cipher.cbData))
{
ERR("CryptEncrypt %u\n", GetLastError());
goto free_hash;
}
protect_data.cipher.cbData=dwLength;
/* debug: show the cipher */
TRACE_DATA_BLOB(&protect_data.cipher);
/* attach our fingerprint */
if (!convert_hash_to_blob(hHash, &protect_data.fingerprint))
{
ERR("convert_hash_to_blob\n");
goto free_hash;
}
/* serialize into an opaque blob */
if (!serialize(&protect_data, pDataOut))
{
ERR("serialize\n");
goto free_hash;
}
/* success! */
rc=TRUE;
free_hash:
CryptDestroyHash(hHash);
free_key:
CryptDestroyKey(hKey);
free_protect_data:
free_protect_data(&protect_data);
free_context:
CryptReleaseContext(hProv,0);
finished:
/* If some error occurred, and no error code was set, force one. */
if (!rc && GetLastError()==ERROR_SUCCESS)
{
SetLastError(ERROR_INVALID_DATA);
}
if (rc)
{
SetLastError(ERROR_SUCCESS);
TRACE_DATA_BLOB(pDataOut);
}
TRACE("returning %s\n", rc ? "ok" : "FAIL");
return rc;
}
/***************************************************************************
* CryptUnprotectData [CRYPT32.@]
*
* Generate Plain data and Description from given Cipher and Entropy data.
*
* PARAMS
* pDataIn [I] Cipher data to be decoded
* ppszDataDescr [O] Optional Unicode string describing the Plain data
* pOptionalEntropy [I] Optional entropy data to adjust cipher, can be NULL
* pvReserved [I] Reserved, must be NULL
* pPromptStruct [I] Structure describing if/how to prompt during decoding
* dwFlags [I] Flags describing options to the decoding
* pDataOut [O] Resulting Plain data, from calls to CryptProtectData
*
* RETURNS
* TRUE If a Plain was generated.
* FALSE If something failed and no Plain is available.
*
* FIXME
* The true Windows encryption and keying mechanisms are unknown.
*
* dwFlags and pPromptStruct are currently ignored.
*
* NOTES
* Memory allocated in pDataOut and non-NULL ppszDataDescr must be freed
* with LocalFree.
*
*/
BOOL WINAPI CryptUnprotectData(DATA_BLOB* pDataIn,
LPWSTR * ppszDataDescr,
DATA_BLOB* pOptionalEntropy,
PVOID pvReserved,
CRYPTPROTECT_PROMPTSTRUCT* pPromptStruct,
DWORD dwFlags,
DATA_BLOB* pDataOut)
{
BOOL rc = FALSE;
HCRYPTPROV hProv;
struct protect_data_t protect_data;
HCRYPTHASH hHash;
HCRYPTKEY hKey;
DWORD dwLength;
const char * announce_bad_opaque_data = "CryptUnprotectData received a DATA_BLOB that seems to have NOT been generated by Wine. Please enable tracing ('export WINEDEBUG=crypt') to see details.";
TRACE("called\n");
SetLastError(ERROR_SUCCESS);
if (!pDataIn || !pDataOut)
{
SetLastError(ERROR_INVALID_PARAMETER);
goto finished;
}
if (!pDataIn->cbData)
{
SetLastError(ERROR_INVALID_DATA);
goto finished;
}
/* debug: show our arguments */
report(pDataIn,pOptionalEntropy,pPromptStruct,dwFlags);
TRACE("\tppszDataDescr: %p\n", ppszDataDescr);
/* take apart the opaque blob */
if (!unserialize(pDataIn, &protect_data))
{
SetLastError(ERROR_INVALID_DATA);
FIXME("%s\n",announce_bad_opaque_data);
goto finished;
}
/* perform basic validation on the resulting structure */
if (!valid_protect_data(&protect_data))
{
SetLastError(ERROR_INVALID_DATA);
FIXME("%s\n",announce_bad_opaque_data);
goto free_protect_data;
}
/* get a crypt context */
if (!CryptAcquireContextW(&hProv,NULL,MS_ENHANCED_PROV_W,CRYPT32_PROTECTDATA_PROV,CRYPT_VERIFYCONTEXT))
{
ERR("CryptAcquireContextW failed\n");
goto free_protect_data;
}
/* load key */
if (!load_encryption_key(hProv,protect_data.cipher_key_len,&protect_data.salt,pOptionalEntropy,&hKey))
{
goto free_context;
}
/* create a hash for the decryption validation */
if (!CryptCreateHash(hProv,CRYPT32_PROTECTDATA_HASH_CALG,0,0,&hHash))
{
ERR("CryptCreateHash\n");
goto free_key;
}
/* prepare for plaintext */
pDataOut->cbData=protect_data.cipher.cbData;
if (!(pDataOut->pbData=LocalAlloc( LPTR, pDataOut->cbData)))
{
ERR("CryptMemAlloc\n");
goto free_hash;
}
memcpy(pDataOut->pbData,protect_data.cipher.pbData,protect_data.cipher.cbData);
/* decrypt! */
if (!CryptDecrypt(hKey, hHash, TRUE, 0, pDataOut->pbData,
&pDataOut->cbData) ||
/* check the hash fingerprint */
pDataOut->cbData > protect_data.cipher.cbData ||
!hash_matches_blob(hHash, &protect_data.fingerprint))
{
SetLastError(ERROR_INVALID_DATA);
LocalFree( pDataOut->pbData );
pDataOut->pbData = NULL;
pDataOut->cbData = 0;
goto free_hash;
}
/* Copy out the description */
dwLength = (lstrlenW(protect_data.szDataDescr)+1) * sizeof(WCHAR);
if (ppszDataDescr)
{
if (!(*ppszDataDescr = LocalAlloc(LPTR,dwLength)))
{
ERR("LocalAlloc (ppszDataDescr)\n");
goto free_hash;
}
else {
memcpy(*ppszDataDescr,protect_data.szDataDescr,dwLength);
}
}
/* success! */
rc = TRUE;
free_hash:
CryptDestroyHash(hHash);
free_key:
CryptDestroyKey(hKey);
free_context:
CryptReleaseContext(hProv,0);
free_protect_data:
free_protect_data(&protect_data);
finished:
/* If some error occurred, and no error code was set, force one. */
if (!rc && GetLastError()==ERROR_SUCCESS)
{
SetLastError(ERROR_INVALID_DATA);
}
if (rc) {
SetLastError(ERROR_SUCCESS);
if (ppszDataDescr)
{
TRACE("szDataDescr: %s\n",debugstr_w(*ppszDataDescr));
}
TRACE_DATA_BLOB(pDataOut);
}
TRACE("returning %s\n", rc ? "ok" : "FAIL");
return rc;
}
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