RE: AES decryption with Qc3DecryptData API

["Bob Cozzi" <cozzi@xxxxxxxxx>]

Since those APIs only work on later OS/400 releases, I decided to use the
Cipher MI instruction instead of the API. It too is a bit complex, but not
nearly as screwy/confusing as the API. 
If you have the xTools, you would just do this:
D szKey        S            32A  Varying
//  Move the 16-byte key value into szKey
Callp  aesDecrypt(data : %len(data) : szKey )

This will change the value of DATA from encrypted to the decrypted value.

This procedure wraps the MI instruction.
Since you're using the API, I won't bother posting the data structure I use
when calling CIPHER for AES encryption.

-Bob Cozzi
www.RPGxTools.com
If everything is under control, you are going too slow.
- Mario Andretti


-----Original Message-----
From: rpg400-l-bounces+cozzi=rpgiv.com@xxxxxxxxxxxx
[mailto:rpg400-l-bounces+cozzi=rpgiv.com@xxxxxxxxxxxx] On Behalf Of
Martin.Verhoef@xxxxxxxxxxxxxxxxxxxxx
Sent: Wednesday, April 13, 2005 4:58 AM
To: rpg400-l@xxxxxxxxxxxx
Subject: AES decryption with Qc3DecryptData API

Has someone experience with the Qc3DecryptData API ?
I have an encrypted string (AES) and a key (size 16) from a customer. The 
encrypted string i want to decrypt
with the provided key and the api. Is it possible to use the api in this 
way ?

How to provide the encrypted string and the key to the parameter group of 
the api ? 
I tried some parameter values but got errors back like 'Length of input 
data not valid'.

Thanks and regards,

Martin Verhoef
Furness Logistics
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