DES Implementation example!

[cj]

Hi,

I want to implement DES Module using library but I'm not able to find
input & Outputs.
For e.g a DES Module takes 64 bit data_in a 64 bit key & gives 64 bit
encrypted data.
To utilize a library function only inputs should be given & output is
recorded.
how to achieve the above funcionality?
Is there any link where such kind of implementation is done.

Thanks & Regards
Subhash.