AW: transfer private key data between applications

[Lorenz, Michael]

Hi David,

thanks for your suggestion. I already had an eye on BouncyCastle but thought it could not be that hard to get the key data :)
But I will try BC for they can handle the package format of the gpg-files too.

Thanks again!

 Michael


-----Ursprüngliche Nachricht-----
Von: David Shaw [mailto:dshaw at jabberwocky.com]
Gesendet: Dienstag, 12. August 2008 16:19
An: gnupg-users at gnupg.org
Betreff: Re: transfer private key data between applications

On Aug 12, 2008, at 5:16 AM, Lorenz, Michael wrote:

> Hello GNU-PG users,
>
> I have a question regarding the export of a private key.
>
> I want to transfer the key-pair of a GPG installation to a Java
> program (using for example the GNU-Crypto library). Since there is a
> very large amount of encrypted records I want to avoid to create a
> big convert-process that decrypts with GPG and encrypts again with
> Java.
>
> As GNU-Crypto supports "ElGamal" I thought it would be possible to
> export the private key as bytes and use this information in Java to
> decrypt the data. But I have difficulties doing this.

You could probably work through this and get it to work, but it's not
going to be easy.  For one, OpenPGP uses a somewhat strange cipher
mode (a variant on CFB).  You'd also have to deal with the OpenPGP
encoding on the packets.

Rather than do all that, take a look at http://www.bouncycastle.org/
They have a Java library that can do OpenPGP directly.

David

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