SQLite3 + encryption for WinCE (arm4i)

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vincococka:
Hi all,

let me share with you following compiled versions of SQLite for Windows CE 5/6 (arm4i).

Download URL:
SQLite 3.9.2 (+ version with AES-128 enc.)
MD5 checksums:
db83043f404e866dbdf4b9c4554fb6ca sqlite3ce.dll
8b27b589c91fb6eadf8fc5fb9e22098f sqlite3ce-aes.dll

Built with following preprocessor macros:

--- Code: ---_UNICODE
UNICODE
NO_TCL
SQLITE_DEFAULT_FOREIGN_KEYS=1
SQLITE_DEFAULT_MMAP_SIZE=2097152
SQLITE_DISABLE_LFS
SQLITE_OMIT_TCL_VARIABLE
SQLITE_OMIT_TRACE
SQLITE_HAS_CODEC
CODEC_TYPE=CODEC_TYPE_AES128
SQLITE_CORE;THREADSAFE=0
SQLITE_THREADSAFE=0
SQLITE_USER_AUTHENTICATION
SQLITE_ENABLE_EXTFUNC

--- End code ---

Download URL:
SQLite 3.11.1.0 (with AES-128 encryption & threadsafe=1)

Built with following preprocessor macros:

--- Code: ---_UNICODE;UNICODE;NO_TCL;SQLITE_DEFAULT_FOREIGN_KEYS=1;SQLITE_DEFAULT_MMAP_SIZE=2097152;SQLITE_DISABLE_LFS;SQLITE_OMIT_TCL_VARIABLE;SQLITE_OMIT_TRACE;SQLITE_HAS_CODEC;CODEC_TYPE=CODEC_TYPE_AES128;SQLITE_CORE;THREADSAFE=1;SQLITE_THREADSAFE=1;SQLITE_USER_AUTHENTICATION;SQLITE_ENABLE_EXTFUNC

--- End code ---

To encrypt database in FreePascal / Lazarus / Delphi you have to first initialize the database with new password via sqlite3_rekey. After encrypting it is enough to use sqlite3_open following with sqlite3_key call...

// Encryption support
//
function sqlite3_key(db: PSQLite3; const pKey: PAnsiChar; nKey: Integer): Integer; cdecl; external 'sqlite3ce-aes.dll';
function sqlite3_rekey(db: PSQLite3; const pKey: PAnsiChar; nKey: Integer): Integer; cdecl; external 'sqlite3ce-aes.dll';

Before opening database it is good to check first 6 bytes of file to compare them with "SQLite" - this means db is unencrypted so you dont have to call sqlite3_key after sqlite3_open.

Examples:

1, opening and encrypting DB file

--- Code: ---sqlite3_open('test.db', db);
sqlite3_rekey(db, 'test', Length('test'));
// then use db as usual

--- End code ---
2, opening already encrypted DB

--- Code: ---sqlite3_open('test.db', db);
sqlite3_key(db, 'test', Length('test'));
// then use db as usual

--- End code ---
3, decrypt database file

--- Code: ---sqlite3_open('test.db', db);
sqlite3_key(db, 'test', Length('test'));
sqlite3_rekey(db, '', 0); // length 0 will decrypt database file
// then use db as usual

--- End code ---

Regards,
Jan

bambamns:
Thank You ;)

First test shows positive results.

I'll put it in production very soon.

vincococka:
Hi,

I`m glad that it is working for you.
I was in need of having current SQLite for on small project running on WinCE, so I decided to fire up Visual Studio and compile it for myself :).

Just consider that it is compiled with O3 optimization and it was optimized for size (not for speed, because file has 750KB) + with following DEFINES:
SQLITE_ENABLE_COLUMN_METADATA
NO_TCL
SQLITE_OMIT_TRACE

When new version comes out I`ll probably compile it again and put it here somewhere in "clouds" :).

Greets,
Vince

bambamns:
This is great !

If you don't mind , it will be very helpful to compile another version with speed optimization, so we can test if there are noticeable differences in performance.

Any way - thx

vincococka:
Hi,

I`ve uploaded freshly compiled build that has optimization preference set to speed (not size):
http://www.filedropper.com/sqlite3-385-arm4i-speed

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