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From "Suresh Thalamati (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1156) allow the encrypting of an existing unencrypted db and allow the re-encrypting of an existing encrypted db
Date Thu, 25 May 2006 18:52:31 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1156?page=comments#action_12413287 ] 

Suresh Thalamati commented on DERBY-1156:

I think to implement re-encryption of an already encrypted database with a 
new password, two instances of the cipher factory are needed, one with the 
old password and one with the new password.  So that one instance of the
factory can be used to decrypt the existing data with the old password and 
another instance to encrypt the data with a new password. 

Currently only one instance of org.apache.derby.impl.services.jce.JCECipherFactory 
is loaded at boot time, this class implement all accessory methods required to 
manage the ciphers. 

As I need to instances of this class for re-encryption of an encrypted db and 
I think  it is not really necessary  to boot this factory with different module

I was thinking of reorganizing this class similar to CacheFactory. Basically I
will just add a new class called say CipherManger and move all the code in the 
current JCECipherFactory into this new class and make CipherFactoy just return
instances of this class CipherManger with the difference encryption properties. 
This way I need to load only one module of CipherFacory through the monitor and 
get instances of CipherManager as needed. 

Any comments/suggestions ?


> allow the encrypting of an existing unencrypted db and allow the re-encrypting of an
existing encrypted db
> ----------------------------------------------------------------------------------------------------------
>          Key: DERBY-1156
>          URL: http://issues.apache.org/jira/browse/DERBY-1156
>      Project: Derby
>         Type: Improvement

>   Components: Store
>     Versions:
>     Reporter: Mike Matrigali
>     Assignee: Suresh Thalamati
>     Priority: Minor
>      Fix For:
>  Attachments: encryptspec.html, reencrypt_1.diff, reencrypt_2.diff
> encrypted database to be re-encrypted with a new password.
> Here are some ideas for an initial implementation.
> The easiest way to do this is to make sure we have exclusive access to the
> data and that no log is required in the new copy of the db.  I want to avoid
> the log as it also is encrypted.  Here is my VERY high level plan:
> 1) Force exclusive access by putting all the work in the low level store,
>    offline boot method.  We will do redo recovery as usual, but at the end
>    there will be an entry point to do the copy/encrypt operation.
> copy/encrypt process:
> 0) The request to encrypt/re-encrypt the db will be handled with a new set
>    of url flags passed into store at boot time.  The new flags will provide
>    the same inputs as the current encrypt flags.  So at high level the
>    request will be "connect db old_encrypt_url_flags; new_encrypt_url_flags".
>    TODO - provide exact new flag syntax.
> 1) Open a transaction do all logged work to do the encryption.  All logging
>    will be done with existing encryption.
> 2) Copy and encrypt every db file in the database.  The target files will
>    be in the data directory.  There will be a new suffix to track the new
>    files, similar to the current process used for handling drop table in
>    a transaction consistent manner without logging the entire table to the log.
>    Entire encrypted destination file is guaranteed synced to disk before
>    transaction commits.  I don't think this part needs to be logged.
>    Files will be read from the cache using existing mechanism and written
>    directly into new encrypted files (new encrypted data does not end up in
>    the cache).
> 3) Switch encrypted files for old files.  Do this under a new log operation
>    so the process can be correctly rolled back if the encrypt db operation
>    transaction fails.  Rollback will do file at a time switches, no reading
>    of encrypted data is necessary.
> 4) log a "change encryption of db" log record, but do not update
>    system.properties with the change.
> 5) commit transaction.
> 6) update system.properties and sync changes.
> 7) TODO - need someway to handle crash between steps 5 and 6.
> 6) checkpoint all data, at this point guaranteed that there is no outstanding
>    transaction, so after checkpoint is done there is no need for the log.
> o there probably should be something that catches a request to encrypt to
>   whatever db was already encrypted with.

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