FW: AES Decryption

["Scott Feddersen" <Scott.Feddersen@xxxxxxxxxx>]

>  -----Original Message-----
> From: 	Scott Feddersen  
> Sent:	Friday, September 21, 2007 10:03 AM
> To:	'midrange-l@xxxxxxxxxxxx'
> Subject:	AES Decryption
>
> I am working on decrypting data from a new version of our POS
> software.  The data is encrypted using AES, 256 bit, ECB, PKCS5
> padding.  Upon closing they zip a series of files that we retrieve
> with our iSeries.  I then unzip these files, parse the data and use
> the Qc3DecryptData api to decrypt credit card numbers.  I am unable to
> decrypt the data, I receive a CPF9DC3 in the error code.  We both use
> the same 32 byte key string to create the keys.  I am able to use the
> Qc3EncryptData and Qc3DecryptData apis on my iseries to encrypt and
> decrypt a string with the key I create.  I supplied the key string and
> the encrypted data to a java developer on our team and he was able to
> decrypt the data with an application he uses.  The encrypted string I
> generate with my key is different from the encrypted string created by
> the POS software. Some of my parameters are as follows:
>
> Decryption
> QC3D0200
> QC3BCA = 22;  AES
> QC3BL    = 32;  Block Length
> QC3MODE = '0'; ECB
> QC3PO = '1'; Remove Padding
>
> The key was created in a Key Store with the Qc3WriteKeyRecord.
> KEYSTRING       =
> x'E0E1E2E3E4E5E6E7E8E9EAEBECEDEEEFF0F1F2F3F4F5F6F7F8F9FAFBFCFDFEFF';
> KEYSTRINGLEN = 32;
> KEYFORMAT     = '0'; Binary String
> KEYTYPE          = 22; AES
> DISALLOWFUNC=0; No Disallowed functions
> KEYFORM         ='0'; Clear
>
> Thanks in advance!
>
> Scott Feddersen
> Buckle, Inc.