RE: Using encryption/decryption of column data via a program

You can't tell DB2 to encrypt a column. You have to do the encryption in the application. We wrote an RPG app with embedded SQL to encrypt and decrypt data. We call it from any app that needs to write encrypted data to the database. It accepts the ENCRYPTD/DECRYPT option and the unencrypted data, encrypts it and sends it back. The calling app then writes it to the database. Any app that needs to decrypt that data reads the database, calls the app which decrypts the data and passes it back. For encrypt/decrypt part is easy. Getting the database field size right to hold the encrypted data is a little tricky. Our app has some other code that I don't show to get the encryption password, and does some testing to see what app is calling it and only lets ones it knows about use it's function for a little added security

/free

If Function = 'ENCRYPT';
EXEC SQL SET :ResultVarying = ENCRYPT_TDES(:InputVarying, :pw);
Endif;

If Function = 'DECRYPT';
EXEC SQL SET :ResultVarying = DECRYPT_CHAR(
cast(:InputVarying as char(5000) for bit data), :pw);
Endif;

/end-free

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Charles Wilt
Sent: Wednesday, October 22, 2008 4:29 PM
To: Midrange Systems Technical Discussion
Subject: Re: Using encryption/decryption of column data via a program

How did you encrypt the column in the table?

Charles

On Wed, Oct 22, 2008 at 3:46 PM, Dave Odom <Dave.Odom@xxxxxxxxxxxx> wrote:

Is there a IBM i function/command that will allow encryption/decryption of column data on the i, especially in conjunction with REXX and/or SQL? I want to have my REXX/FTP programs encrypt and decrypt a password stored in a table. I don't want to have to use any Windows program or any of its functions, just functions/commands/programs in one of the native languages on the i.

Thanks in advance,

Dave
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