Objective Development Forums

i want encrypt my data that transfer between Computer(pc) and usb device(atmega8 + v-usb)
i found several cryptography library for 8bit microcontroller
https://cryptolux.org/Links_to_Embedded_Crypto_Implementations
and many cryptography library for Computers like
http://www.polarssl.org
the cryptography algorithm must be same in Computer and microcontroller
but 8bit cryptography library cannot complied for Computers and cryptography library for Computers is large and slow for microcontroller
are there any cryptography library for the pc and 8bit microcontroller?
or
how can compile 8bit cryptography library for pc?

thank you