Filename with checksum

Hi Experts,

I am working on  file scenario below the pattern of file I need to generate with the details. How can we know the file is checksum or not. Uniquecode has to be generate with date milliseconds with random number.

File pattern is QPS.COMPANYCODE.CY/CN.CURRENCYCODE.UNIQUECODE

Ex: QPS.0111.CN.USD.0911242847812

QPS is identifying the file

0111 is company code

CY/CN if the file is checksum then CY or CN

USD is currency code

UniqueCode  have to generate  using DDHHMMSSNNNRR (DD - Day, HH - Hour, MM- Minute, SS-Second, NNN - Milisecond, RR - Random Number)

Any help would be appreciated.

Regards,

Mohammad