== SQLite Cipher ==

SQLite Cipher is an SQLite extension that provides transparent 256 bit AES encryption of database files.

Pages are encrypted before being written to disk and are decrypted when read back.

Encryption is provided by the OpenSSL crypto library.

SQLite Cipher was initially developed by Stephen Lombardo at Zetetic LLC (sjlombardo@zetetic.net) to provide

the encrypted database layer for Strip, an iPhone data vault and password manager ( http://www.zetetic.net/products/strip ).

The official SQLCipher software site can be found at http://www.zetetic.net/software/sqlcipher

Issues or support questions on using SQLCipher should be entered into the GitHub Issue tracker:

http://github.com/sjlombardo/sqlcipher/issues

Please DO NOT post issues, support questions, or other problems to blog posts about SQLCipher as we do not monitor them frequently.

If you are using SQLCipher in your own software please let us know at support@zetetic.net!

[Compiling]

Building SQLite Cipher is almost the same as compiling a regular version of SQLite with three small exceptions:

1. building via 'amalgamation' isn't supported (where all sqlite source is merged into one file)

2. you must define SQLITE_HAS_CODEC and SQLITE_TEMP_STORE=2 in your application when including SQLCipher

3. You need to link against a OpenSSL's libcrypto with sha256 support compiled in

Example Static linking (replace /opt/local/lib with the path to libcrypto.a)

./configure --enable-tempstore=yes CFLAGS="-DSQLITE_HAS_CODEC" LDFLAGS="/opt/local/lib/libcrypto.a"

make

Example Dynamic linking

./configure --enable-tempstore=yes CFLAGS="-DSQLITE_HAS_CODEC" LDFLAGS="-lcrypto"

make

[Encrypting a database]

To specify an encryption passphrase for the database you can use a pragma. The passphrase

you enter is hashed using sha256 and the result is used as the encryption key for the

database.

PRAGMA key = 'passphrase';

Alternately, you can specify an exact byte sequence using a blob literal. If you

use this method it is your responsibility to ensure that the data you provide a

64 character hex string, which will be converted directly to 32 bytes (256 bits) of

key data.

PRAGMA key = "x'2DD29CA851E7B56E4697B0E1F08507293D761A05CE4D1B628663F411A8086D99'";

To encrypt a database programatically you can use the sqlite3_key function. The data provided

in pKey is converted to an encryption key according to the same rules as PRAGMA key.

int sqlite3_key(sqlite3 *db, const void *pKey, int nKey);

PRAGMA key or sqlite3_key should be called as the first operation when a database is open.

[Changing a database key]

To change the encryption passphrase for an existing database you should use the rekey pragma

after you've supplied the correct database password;

PRAGMA key = 'passphrase'; -- start with the existing database passphrase

PRAGMA rekey = 'new-passphrase'; -- rekey will reencrypt the database with the new passphrase

The hexrekey pragma may be used to rekey to a specific binary value

PRAGMA rekey = "x'2DD29CA851E7B56E4697B0E1F08507293D761A05CE4D1B628663F411A8086D99'";

This can be accomplished programtically by using sqlite3_rekey;

sqlite3_rekey(sqlite3 *db, const void *pKey, int nKey)

[Encrypting a standard database]

Encrypting a standard, plaintext SQLite database is not supported at this time. We are currently

working on a resolution to the problem. In the mean time it is easiest to start out with an

encrypted database if possible. Alternately it should be possible to open a standard database,

ATTACH an encrypted DB, and then copy your tables and data between the two.

[License]

Copyright (c) 2008, ZETETIC LLC

All rights reserved.

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright

notice, this list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright

notice, this list of conditions and the following disclaimer in the

documentation and/or other materials provided with the distribution.

* Neither the name of the ZETETIC LLC nor the

names of its contributors may be used to endorse or promote products

derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY ZETETIC LLC ''AS IS'' AND ANY

EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

DISCLAIMED. IN NO EVENT SHALL ZETETIC LLC BE LIABLE FOR ANY

DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

== End SQLite Cipher ==

This directory contains source code to

SQLite: An Embeddable SQL Database Engine

To compile the project, first create a directory in which to place

the build products. It is recommended, but not required, that the

build directory be separate from the source directory. Cd into the

build directory and then from the build directory run the configure

script found at the root of the source tree. Then run "make".

For example:

tar xzf sqlite.tar.gz ;# Unpack the source tree into "sqlite"

mkdir bld ;# Build will occur in a sibling directory

cd bld ;# Change to the build directory

../sqlite/configure ;# Run the configure script

make ;# Run the makefile.

make install ;# (Optional) Install the build products

The configure script uses autoconf 2.61 and libtool. If the configure

script does not work out for you, there is a generic makefile named

"Makefile.linux-gcc" in the top directory of the source tree that you

can copy and edit to suit your needs. Comments on the generic makefile

show what changes are needed.

The linux binaries on the website are created using the generic makefile,

not the configure script. The windows binaries on the website are created

using MinGW32 configured as a cross-compiler running under Linux. For

details, see the ./publish.sh script at the top-level of the source tree.

The developers do not use teh configure script.

SQLite does not require TCL to run, but a TCL installation is required

by the makefiles. SQLite contains a lot of generated code and TCL is

used to do much of that code generation. The makefile also requires

AWK.

Contacts:

http://www.sqlite.org/