Пароль на SQLite

/* 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;
  HCRYPTKEY hKey = 0;
 
  /* No key specified, could mean either use the main db's encryption or no encryption */
  if (!pKey || !nKeyLen)
  {
    if (!nDb)
    {
      return SQLITE_OK; /* Main database, no key specified so not encrypted */
    }
    else /* Attached database, use the main database's key */
    {
      /* Get the encryption block for the main database and attempt to duplicate the key
      ** for use by the attached database
      */
      Pager *p = sqlite3BtreePager(db->aDb[0].pBt);
      LPCRYPTBLOCK pBlock = (LPCRYPTBLOCK)sqlite3pager_get_codecarg(p);
 
      if (!pBlock) return SQLITE_OK; /* Main database is not encrypted so neither will be any attached database */
      if (!pBlock->hReadKey) return SQLITE_OK; /* Not encrypted */
 
      if (!CryptDuplicateKey(pBlock->hReadKey, NULL, 0, &hKey))
        return rc; /* Unable to duplicate the key */
    }
  }
  else /* User-supplied passphrase, so create a cryptographic key out of it */
  {
    hKey = DeriveKey(pKey, nKeyLen);
    if (hKey == MAXDWORD)
    {
#if SQLITE_VERSION_NUMBER >= 3008007
      sqlite3ErrorWithMsg(db, rc, SQLITECRYPTERROR_PROVIDER);
#else
      sqlite3Error(db, rc, SQLITECRYPTERROR_PROVIDER);
#endif
      return rc;
    }
  }
 
  /* Create a new encryption block and assign the codec to the new attached database */
  if (hKey)
  {
    Pager *p = sqlite3BtreePager(db->aDb[nDb].pBt);
    LPCRYPTBLOCK pBlock = CreateCryptBlock(hKey, p, -1, NULL);
    if (!pBlock) return SQLITE_NOMEM;
 
    sqlite3PagerSetCodec(p, sqlite3Codec, sqlite3CodecSizeChange, sqlite3CodecFree, pBlock);
 
    rc = SQLITE_OK;
  }
  return rc;
}