Package com.healthmarketscience.jackcess.crypt.impl

Class OfficeEncryptionHandler

java.lang.Object

com.healthmarketscience.jackcess.crypt.impl.OfficeEncryptionHandler

public class OfficeEncryptionHandler
extends Object

Removes office encryption from an .accdb database.

The decryption itself is the read path, so this works for every scheme CryptCodecProvider can open, agile and the older ones alike. What this adds is page 0 and the SIDs.

Page 0 is never encrypted and carries three things which have to go: the encoding key, which office uses as a per file salt, the password field, which holds the low byte of that key repeated, and the EncryptionInfo structure. The format version is left as it is, because ms access raises it when it writes agile and does not lower it again when the encryption is removed.

Clearing the password field moves the key which masks every SID, so the SIDs follow, see SidRemasker. Leaving that field alone to avoid the work is not an option: ms access reads it as a database password and prompts for one.

Author:

James Ahlborn

Method Summary

Modifier and Type	Method	Description
static void	addEncryption(Path srcFile, Path dstFile, String password, AgileEncryptionConfig config)	Copies the given plain database to the given destination, encrypted with agile encryption under the given password.
static void	removeEncryption(Path srcFile, Path dstFile, String password)	Copies the given encrypted database to the given destination, decrypted.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

removeEncryption

public static void removeEncryption(Path srcFile,
                                    Path dstFile,
                                    String password)
                             throws IOException

Copies the given encrypted database to the given destination, decrypted.

Throws:

IOException

addEncryption

public static void addEncryption(Path srcFile,
                                 Path dstFile,
                                 String password,
                                 AgileEncryptionConfig config)
                          throws IOException

Copies the given plain database to the given destination, encrypted with agile encryption under the given password.

Throws:

IOException