AES decryption with Qc3DecryptData API

[Martin.verhoef@xxxxxxxxxxxxxxxxxxxxx]

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