System.Data.SQLite

Check-in [2847ced366]
Login

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Protect access to the CryptoAPI provider handle with a mutex.
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: 2847ced3666f238d4189530fc3b5cc4a85f1bbf3
User & Date: mistachkin 2013-02-26 00:39:53.067
Context
2013-02-26
02:51
Style fix. check-in: 44eb94e4ec user: mistachkin tags: trunk
00:39
Protect access to the CryptoAPI provider handle with a mutex. check-in: 2847ced366 user: mistachkin tags: trunk
2013-02-25
23:37
Adjust the Fossil ignore-glob settings file. check-in: 101f077d2c user: mistachkin tags: trunk
Changes
Unified Diff Ignore Whitespace Patch
Changes to SQLite.Interop/src/win/crypt.c.
︙︙
39
40
41
42
43
44
45



46



47
48
49

50
51


52
53
54
55
56
57
58

}

/* Create a cryptographic context.  Use the enhanced provider because it is available on
** most platforms
*/
static BOOL InitializeProvider()
{



  if (g_hProvider) return TRUE;




  if (!CryptAcquireContext(&g_hProvider, NULL, MS_ENHANCED_PROV, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
  {

    return FALSE;
  }


  return TRUE;
}

/* Create or update a cryptographic context for a pager.
** This function will automatically determine if the encryption algorithm requires
** extra padding, and if it does, will create a temp buffer big enough to provide
** space to hold it.








>
>
>
|
>
>
>



>


>
>








39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67

}

/* Create a cryptographic context.  Use the enhanced provider because it is available on
** most platforms
*/
static BOOL InitializeProvider()
{
  MUTEX_LOGIC( sqlite3_mutex *pMaster = sqlite3_mutex_alloc(SQLITE_MUTEX_STATIC_MASTER); )
  sqlite3_mutex_enter(pMaster);

  if (g_hProvider) {
    sqlite3_mutex_leave(pMaster);
    return TRUE;
  }

  if (!CryptAcquireContext(&g_hProvider, NULL, MS_ENHANCED_PROV, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
  {
    sqlite3_mutex_leave(pMaster);
    return FALSE;
  }

  sqlite3_mutex_leave(pMaster);
  return TRUE;
}

/* Create or update a cryptographic context for a pager.
** This function will automatically determine if the encryption algorithm requires
** extra padding, and if it does, will create a temp buffer big enough to provide
** space to hold it.
︙︙
224
225
226
227
228
229
230




231
232
233
234
235
236
237
238




239
240
241
242
243
244
245

  if (!pKey || !nKeyLen) return 0;

  if (!InitializeProvider())
  {
    return MAXDWORD;
  }





  if (CryptCreateHash(g_hProvider, CALG_SHA1, 0, 0, &hHash))
  {
    if (CryptHashData(hHash, (LPBYTE)pKey, nKeyLen, 0))
    {
      CryptDeriveKey(g_hProvider, CALG_RC4, hHash, 0, &hKey);
    }
    CryptDestroyHash(hHash);
  }




  return hKey;
}

/* Called by sqlite and sqlite3_key_interop to attach a key to a database. */
int sqlite3CodecAttach(sqlite3 *db, int nDb, const void *pKey, int nKeyLen)
{
  int rc = SQLITE_ERROR;








>
>
>
>
|
|
|
|
|
|
|
|
>
>
>
>








233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262

  if (!pKey || !nKeyLen) return 0;

  if (!InitializeProvider())
  {
    return MAXDWORD;
  }

  {
    MUTEX_LOGIC( sqlite3_mutex *pMaster = sqlite3_mutex_alloc(SQLITE_MUTEX_STATIC_MASTER); )
    sqlite3_mutex_enter(pMaster);

    if (CryptCreateHash(g_hProvider, CALG_SHA1, 0, 0, &hHash))
    {
      if (CryptHashData(hHash, (LPBYTE)pKey, nKeyLen, 0))
      {
        CryptDeriveKey(g_hProvider, CALG_RC4, hHash, 0, &hKey);
      }
      CryptDestroyHash(hHash);
    }

    sqlite3_mutex_leave(pMaster);
  }

  return hKey;
}

/* Called by sqlite and sqlite3_key_interop to attach a key to a database. */
int sqlite3CodecAttach(sqlite3 *db, int nDb, const void *pKey, int nKeyLen)
{
  int rc = SQLITE_ERROR;
︙︙