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MQSeries.net Forum Index » General IBM MQ Support » MQ Data Conversion Question.

MQ Data Conversion Question.

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johndriscoll

Posted: Tue Jan 31, 2006 7:59 am Post subject: MQ Data Conversion Question.

Newbie

Joined: 09 Sep 2004
Posts: 3

I have a program that sends data from a Z/oS cobol application that is using Xor to encrypt the data in the message. The target machine is a Unix Solaris machine. The Sending program encodes the data with a XOR and is in Ebcdic format. The receiving process expects the data to still be in that Ebcdic format when it recieves and decodes it.

When reading the data from the UNIX queue, using Java, the data comes through as converted ASCII format. We did not use the option of MQGMO_CONVERT because we wanted to read the data in as Ebcdic format. Does Java MQ actually convert the data as a default? Is there a way we could stop it from converting the data to ASCII?

Pedro El

mvic

Posted: Tue Jan 31, 2006 9:29 am Post subject: Re: MQ Data Conversion Question.

Jedi

Joined: 09 Mar 2004
Posts: 2080

johndriscoll wrote:

When reading the data from the UNIX queue, using Java, the data comes through as converted ASCII format.

Hi, It may help us to comment if you could post a piece of Java source from your app that shows the error.

fjb_saper

Posted: Tue Jan 31, 2006 8:56 pm Post subject:

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY

Working as designed!

Your message is in MQSTR format. It is subject to conversion exit or channel exit and if JMS read with conversion....

You need to leave the format blank so that it is recognized as bytes.

Your encryption scheme is not based on a character substitution table so why would you be able to decrypt once the qmgr tryed to convert ?

Once encrypted you truely have a byte message.

Anyway if you do use encryption why not go all the way and use a generated random key? There are very good explanation of the encryption concepts in the java JCE and JSSE packs. http://java.sun.com

As well you might want to read "Java Security Solutions" by Rich and Johennie Helton with an excellent introduction to elliptic curve cryptography...

Enjoy

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